US Modular Marine Radio MA User Manual

INSTALLATION MANUAL  
MODULAR  
NON-VARIABLE SPEED AIR HANDLERS  
MODELS: MA  
ISO 9001  
Certified Quality  
Management System  
LIST OF SECTIONS  
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1  
SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1  
UNIT INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2  
ELECTRIC HEATER INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . .5  
LOW VOLTAGE CONTROL CONNECTIONS . . . . . . . . . . . . . . . . . .6  
REQUIRED CONTROL  
SET-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6  
LINE POWER CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8  
BLOWER SPEED CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . 8  
UNIT DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9  
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15  
WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16  
LIST OF FIGURES  
Typical Installation with MC Multi-Position Coils . . . . . . . . . . . . . . . . .3  
Coil and Air Handler Attachment Details . . . . . . . . . . . . . . . . . . . . . . .3  
Gasket Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4  
Dimensions & Duct Connection Dimensions . . . . . . . . . . . . . . . . . . . .4  
Typical Horizontal Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5  
Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5  
Line Power Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8  
460V - Line Power Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8  
Blower Speed Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8  
460V - Blower Speed Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . 8  
Cooling Models with Electric Heat Wiring . . . . . . . . . . . . . . . . . . . . . 15  
Single-Stage Cooling Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15  
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16  
LIST OF TABLES  
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4  
Low Voltage Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6  
Fault Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7  
Low Fan Control Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7  
Blower Delays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7  
Heat Relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7  
Physical and Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9  
Electrical Data - Cooling Only (60 Hz) - 208/230 . . . . . . . . . . . . . . . . .9  
Electrical Data - Cooling Only (60 Hz) - 460 . . . . . . . . . . . . . . . . . . . .9  
Conversion Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9  
Electrical Data - 1 Ø - 208/230-1-60 . . . . . . . . . . . . . . . . . . . . . . . . .10  
Electrical Data - (For Multi-Source Power Supply) -  
Electrical Data - (For Single Source Power Supply) -  
Copper Wire 1 Ø - 208/230-1-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . 11  
Electrical Data - 3 Ø - 208/230-3-60 . . . . . . . . . . . . . . . . . . . . . . . . . 11  
Electrical Data - (For Multi-Source Power Supply) -  
Copper Wire 3 Ø - 208/230-3-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . 12  
Electrical Data - (For Single Source Power Supply) -  
Copper Wire 3 Ø - 208/230-3-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . 12  
Electrical Data - 460-3-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12  
Electrical Data - (For Single Source Power Supply) -  
Copper Wire 3 Ø - 460-3-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12  
Air Flow Data - 60 Hz Models (230 & 460 Volt) . . . . . . . . . . . . . . . . 13  
Air Flow Data - 60 Hz Models (208 Volt) . . . . . . . . . . . . . . . . . . . . . 14  
Copper Wire 1 Ø - 208/230-1-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . .10  
CAUTION indicates a potentially hazardous situation, which, if not  
avoided may result in minor or moderate injury. It is also used to  
alert against unsafe practices and hazards involving only property dam-  
age.  
SECTION I: GENERAL  
This modular air handler provides the flexibility for installation in any  
upflow, downflow, or horizontal application. These versatile models may  
be used for cooling or heat pump operation with or without electric heat.  
A BRAND LABEL (available from Distribution) may be applied to the  
center of the blower access panel.  
Improper installation may create a condition where the operation of  
the product could cause personal injury or property damage.  
Improper installation, adjustment, alteration, service or mainte-  
nance can cause injury or property damage. Refer to this manual  
for assistance or for additional information, consult a qualified con-  
tractor, installer or service agency.  
The unit can be positioned for bottom return air in the upflow position,  
top return air in the downflow position, and right or left return in the hor-  
izontal position.  
Top and side power wiring and control wiring, accessible screw termi-  
nals for control wiring and easy to install electric heaters all combine to  
make the installation easy, and minimize installation cost.  
SECTION II: SAFETY  
This product must be installed in strict compliance with the installa-  
tion instructions and any applicable local, state, and national codes  
including, but not limited to building, electrical, and mechanical  
codes.  
This is a safety alert symbol. When you see this symbol on  
labels or in manuals, be alert to the potential for personal  
injury.  
Understand and pay particular attention to the signal words DANGER,  
WARNING, or CAUTION.  
DANGER indicates an imminently hazardous situation, which, if not  
FIRE OR ELECTRICAL HAZARD  
avoided, will result in death or serious injury.  
Failure to follow the safety warnings exactly could result in serious  
injury, death or property damage.  
A fire or electrical hazard may result causing property damage, per-  
sonal injury or loss of life.  
WARNING indicates a potentially hazardous situation, which, if not  
avoided, could result in death or serious injury.  
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HORIZONTAL RIGHT  
HORIZONTAL LEFT  
UPFLOW  
DOWNFLOW  
FIGURE 1: Typical Installation with MC Multi-Position Coils  
8. Secure base of air handler to top of coil using screws.  
9. Locate 2” wide foam gasket.  
DOWNFLOW AND HORIZONTAL CONVERSION  
These air handler units are supplied ready to be installed in a upflow,  
downflow and left or right hand horizontal position.  
10. On the interior of the air handler/coil attachment point, apply foam  
gasket over duct flanges on the sides and back.  
If the unit is to be installed with an evaporator coil, refer to Figure 1 for  
unit positioning information.  
11. Reinstall blower motor and housing by reversing the process in  
Steps 3 and 4.  
TIE PLATE  
12. Complete electrical and blower speed connections as outlined in  
other sections of this document.  
AIR HANDLER  
13. Reposition and replace blower access panel.  
AIR HANDLER AND COIL DOWNFLOW  
1. Position blower casing over duct connection and secure such that  
the supply air end of the blower is down.  
2. Apply neoprene gasket to return-air side of air handler.  
3. Place coil casing over blower return opening.  
COIL  
COIL  
4. Attach tie plate to casings of air handler and coil using screws.  
5. Remove blower access panel and coil filter door.  
TOP PLATE  
UPFLOW & HORIZONTAL  
6. Disconnect wiring to blower motor.  
APPLICATIONS  
*Note location of wires as these will be reconnected in a later step.  
DOWNFLOW  
APPLICATION  
7. Remove blower motor and housing.  
8. Fasten duct flanges of coil to base of air handler with screws. See  
Figure 1.  
AIR HANDLER  
9. Secure base of air handler to base of coil using screws.  
10. Locate 2” wide foam gasket.  
FIGURE 2: Coil and Air Handler Attachment Details  
11. On the interior of the air handler/coil attachment point, apply foam  
gasket over duct flanges on the sides and back.  
AIR HANDLER AND COIL UPFLOW AND  
HORIZONTAL  
12. Reinstall blower motor and housing by reversing the process in  
Steps 3 and 4.  
1. Apply neoprene gasket to top of coil casing.  
2. Position blower casing over coil opening.  
13. Complete electrical and blower speed connections as outlined in  
other sections of this document.  
3. Attach tie plate to casings of air handler and coil using screws.  
4. Remove blower access panel and coil filter door.  
14. Reposition and replace blower access panel.  
5. Disconnect wiring to blower motor. *Note location of wires as these  
will be reconnected in a later step.  
6. Remove blower motor and housing.  
7. Fasten duct flanges of coil to duct flanges of air handler with  
screws. See Figure 1.  
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FIGURE 3: Gasket Location  
J
E
10-3/8”  
K
A
TOP OUTLET  
DIMENSIONS  
CIRCUIT BREAKER  
PANEL  
22”  
B
D
20-1/2”  
BOTTOM INLET  
DIMENSIONS  
FIGURE 4: Dimensions & Duct Connection Dimensions  
TABLE 1: Dimensions  
Wiring Knockouts1  
Dimensions  
MA  
MODELS  
A
B
D
E
J
K
Height  
Width  
17-1/2  
17-1/2  
24-1/2  
21  
Power  
Control  
08B  
12B  
16-1/2  
16-1/2  
23-1/2  
20  
14-19/32  
14-19/32  
21-19/32  
18-3/32  
7/8” (1/2”)  
1 3/8” (1”)  
1 23/32” (1 1/4”)  
14D  
16C  
20D  
25  
7/8” (1/2”)  
24-1/2  
23-1/2  
21-19/32  
1. Actual size (Conduit size).  
Use flexible duct collars to minimize the transmission of vibration/noise  
into the conditioned space. If electric heat is used, non-flammable  
material must be used.  
DUCT CONNECTORS  
Where return air duct is short, or where sound may be a problem,  
sound absorbing glass fiber should be used inside the duct. Insulation  
of duct work is a must where it runs through an unheated space during  
the heating season or through an uncooled space during the cooling  
season. The use of a vapor barrier is recommended to prevent absorp-  
tion of moisture from the surrounding air into the insulation.  
Use 1/2" screws to connect ductwork to bottom of unit. Longer  
screws will pierce the drain pan and cause leakage. If pilot holes  
are drilled, drill only though field duct and unit bottom flange.  
Air supply and return may be handled in one of several ways best  
suited to the installation. See Figure 3 for dimensions for duct inlet and  
outlet connections.  
The supply air duct should be properly sized by use of a transition to  
match unit opening. All ducts should be suspended using flexible hang-  
ers and never fastened directly to the structure. This unit is not  
designed for non-ducted (freeblow) applications. Size outlet plenum or  
transition to discharge opening sizes shown in Figure 3.  
The vast majority of problems encountered with combination heating  
and cooling systems can be linked to improperly designed or installed  
duct systems. It is therefore highly important to the success of an instal-  
lation that the duct system be properly designed and installed.  
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Duct work should be fabricated and installed in accordance with local  
and/or national codes. This includes the standards of the National Fire  
Protection Association for Installation of Air-Conditioning and Ventilat-  
ing Systems, NFPA No. 90B.  
3-1/2 - 5 Ton  
24”  
53” - 58”  
22”  
FIGURE 5: Typical Horizontal Installation  
SECTION IV: ELECTRIC HEATER  
INSTALLATION  
AIR FILTERS  
Air filters and filter racks must be field supplied.  
If the air handler requires electric heat, install the electric heat kit  
according to the installation instructions included with the kit. After  
installing the kit, mark the air handler nameplate to designate the heater  
kit that was installed. If no heater is installed, mark the name plate  
appropriately to indicate that no heat kit is installed.  
.
Equipment should never be operated without filters.  
The HEAT ENABLE jumper (See Figure 5) must be moved to the HEAT  
position to enable operation of the heater.  
SUSPENSION KITS  
A suspension kit is available. Models 1BH0601 (unit size 018-060) is  
designed specifically for the units contained in this instruction (upflow  
application only). For installation of these accessory kits, see the  
instructions packed with the kit.  
Use only 4HK heater kits, as listed on Air Handler name plate and in  
these Instructions. Use data from Tables 11 through 18 for information  
on required minimum motor speed tap to be used for heating operation,  
maximum over-current protection device required and minimum electri-  
cal supply wiring size required for listed combination of Air Handler and  
Heater Kit.  
HORIZONTAL SUSPENSION  
For suspension of these units in horizontal applications, it is recom-  
mended to use angle steel support brackets with threaded rods, sup-  
porting the units from the bottom, at the locations shown in Figure 4.  
For Upflow, Downflow and Horizontal right hand applications the kits  
can be installed without modification.  
Field modification is required for Horizontal left-hand airflow application  
only. Follow instructions with heater for modification.  
SUSPENSION SUPPORT LOCATIONS FOR HORIZONTAL APPLICATIONS  
MIN. 3/8”  
THREADED ROD  
MIN. 1-1/2” x 1-1/2” Angle  
Recommended length  
26” minimum  
with 2” clearance on  
both sides of Air Handler  
1-1/2  
2
YY  
WW  
XX  
Dimension  
XX  
Units  
(Nominal Tons)  
WW  
16”  
YY  
22”  
1-1/2 - 3 Ton  
48”  
FIGURE 5: Typical Horizontal Installation  
HUM OUT  
RELAY OUTPUT  
HEAT ENABLE  
JUMPER  
EAC RELAY  
OUTPUT  
LOW FAN  
RELAY OUTPUT  
MODE JUMPER  
HUM STAT JUMPER  
FUSE  
SPARE  
JUMPER  
FIGURE 6: Control Board  
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819288-UIM-A-0212  
speed. This is accomplished using the LOW FAN output and a field  
installed two-speed fan relay kit for non-variable speed models and the  
de-humidification input of the motor for variable speed models. The  
humidity switch should be connected to the R and HUM terminals of the  
control. See Figures 10 & 11.  
SECTION V: LOW VOLTAGE CONTROL  
CONNECTIONS  
The 24 volt power supply is provided by an internally wired low voltage  
transformer which is standard on all models, However, if the unit is con-  
nected to a 208 volt power supply, the low voltage transformer must be  
rewired to the 208 volt tap. See the unit wiring label.  
SECTION VI: REQUIRED CONTROL  
SET-UP  
Field supplied low voltage wiring can exit the unit on the top right hand  
corner or the right hand side panel. Refer to Figure 3.  
IMPORTANT: The following steps must be taken at the time of installa-  
Remove desired knockout and pierce foil faced insulation to allow wir-  
ing to pass through. Use as small of a hole as possible to minimize air  
leakage.  
tion to insure proper system operation.  
1. Consult system wiring diagram to determine proper thermostat  
wiring for your system.  
Install a 7/8” plastic bushing in the selected hole and keep low voltage  
wiring as short as possible inside the control box.  
2. If heat kit is installed, change HEAT ENABLE jumper from NO  
HEAT to HEAT position.  
To further minimize air leakage, seal the wiring entry point at the outside  
of the unit.  
3. If a humidstat is installed, change HUM STAT jumper from NO to  
YES.  
The field wiring is to be connected at the screw terminals of the control  
board. Refer to Figures 10 & 11.  
4. Set the MODE jumper to A/C (Air Conditioner) or HP (Heat Pump)  
position depending on the outdoor unit included with the system.  
FUNCTIONALITY AND OPERATION  
NOTICE  
All wiring must comply with local and national electrical code require-  
Jumper Positions  
Heat Enable Jumper  
ments. Read and heed all unit caution labels.  
The HEAT ENABLE jumper configures the control for heat kit operation.  
The jumper must be in the HEAT position if a heat kit is installed with  
the air handler.  
NOTICE  
With the jumper in the NO HEAT position, the control will not energize  
the heat relay outputs or sense the limit switch input.  
It is possible to vary the amount of electric heat turned on during the  
defrost cycle of a heat pump. Standard wiring will only bring on the  
first stage of electric heat during defrost. See Heat Output and Limit  
Connections and Table 6 for additional information on heat during  
defrost cycle.  
If the jumper is not present, the control will operate as if the jumper is in  
the HEAT position. If the jumper is not present and a heat kit is not pres-  
ent, the control will sense an open limit condition and the blower will run  
continuously.  
TABLE 2: Low Voltage Connections  
Hum Stat Jumper  
The HUM STAT jumper configures the control to monitor the humidity  
switch input. With the jumper in the NO position, the control will ener-  
gize the HUM terminal with 24 VAC continually. With the jumper in the  
YES position, the control will monitor the HUM input to control the HUM  
OUT output to control an external humidifier.  
Terminal Signal  
Comment  
R
G
24 VAC power (fused)  
Continuous Fan operation  
Second or full stage  
compressor operation  
Y/Y2  
Y1  
First stage compressor  
operation  
Not used with outdoor units  
having one stage compressors.  
If the jumper is not present, the control will operate as if the jumper is in  
the YES position.  
W2  
W1  
Second stage heat operation  
First stage heat operation  
Mode Jumper  
24 VAC will be present at this  
terminal when the MODE  
jumper is in the AC position.  
This is normal.  
The MODE jumper configures the control to operate properly with an air  
conditioner (AC position) or heat pump (HP position). With the jumper in  
the AC position, the control will energize the O terminal with 24 VAC  
continually. With the jumper in the HP position, the O input signal is  
received from the room thermostat.  
O
Reversing valve operation  
Humidity switch input  
24 VAC will be present at this  
terminal when the HUM STAT  
jumper is in the NO position.  
This is normal.  
HUM  
If the jumper is not present, the control will operate as if the jumper is in  
the HP position.  
This terminal is a connection  
point only and does not affect  
air handler control operation.  
Connection point for  
heat pump fault indicator  
X/L  
SPARE Jumper  
The control includes a spare jumper that can be used if a jumper is lost.  
The SPARE jumper does not have any effect on the operation of the  
control.  
COM  
24 VAC common  
The low voltage connections may be connected to the screw terminals  
or the quick connect terminals. The screw terminals and the quick con-  
nect terminals are physically connected on the control board.  
Status and Fault Codes  
The control includes an LED that displays status and fault codes. These  
codes are shown in Table 3. The control will display the fault codes until  
power is removed from the control or the fault condition is no longer  
present.  
HUMIDITY SWITCH INPUT  
The air handler control is designed to work with a humidity control that  
closes when the humidity is below the set-point. The control is open  
when the humidity is above the set-point. This humidity control may be  
referred to as a humidistat or a dehumidistat.  
The humidity switch controls both humidification and de-humidification  
operation of the control. The control provides humidification using the  
HUM OUT relay output and de-humidification by lowering the blower  
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Heat Output and Limit Connections  
TABLE 3: Fault Codes  
Fault or Status Condition  
The control is connected to the heater relays and limit switch using the  
6-pin connector. The relay outputs and the limit switch signal are 24  
VDC.  
LED1 (RED)  
Flash Code  
Status  
The control energizes the heat relays and senses the limit switch input  
as shown in Table 6 when the HEAT ENABLE jumper is in the HEAT  
position.  
No power to control  
OFF  
2s ON / 2s OFF  
Rapid Flash  
ON  
Normal operation  
Control in test mode  
TABLE 6: Heat Relays  
Control failure  
Input  
W1  
Heat Relay Output  
HT1  
Limit Faults  
Limit switch currently open (not in lockout)  
Multiple limit openings with no call for heat  
Multiple limit openings during one call for heat  
Single long duration limit opening  
Multiple long duration limit openings  
Fan failure  
1
2
3
4
5
6
W2  
HT1 and HT2  
W1 and W2  
HT1 and HT2 and HT3  
The control energizes the first stage of electric heat immediately, the  
second stage 10 seconds after the call for second stage heat, and the  
third stage 20 seconds after the call for third stage heat.  
Wiring Related Faults  
Depending on the heat kit installed in the air handler, the control pro-  
vides the flexibility to configure the amount of heat delivered with the  
first stage heating call. As an example, when the control’s W1 input is  
connected to the room thermostat’s first stage heat signal, a call for first  
stage heat will energize one heating element (HT1). If the control’s W2  
input is connected to the room thermostat’s first stage heat signal, a call  
for first stage heat will energize two heating elements (HT1 & HT2).  
With either configuration, the control will energize three heating ele-  
ments (HT1, HT2, & HT3) when it receives a first and second stage  
heat input from the thermostat.  
Simultaneous call for heating and cooling  
Internal Control Faults  
7
9
Control recovered from internal event  
External Relay Outputs  
The control includes three outputs to drive external relays having 24  
VAC coils. The outputs have a maximum rating of 1.0 Amp pilot duty at  
24 VAC.  
HUM OUT  
Limit Switch and Lockout Operation  
Limit Switch Operation  
The HUM OUT output can be used to drive an external relay or solenoid  
(24 VAC coil) to control a humidifier. The output is energized when the  
HUM input is energized, the HUM STAT is in the YES position, and the  
control has a thermostat call for heating (heat pump or electric heat).  
If the HEAT ENABLE jumper is in the HEAT position and the limit switch  
opens (fault code 1), the control will immediately de-energize all electric  
heat relay outputs and energize the blower (if it wasn’t already ener-  
gized). When the limit switch closes, the control will re-energize electric  
heat according to the thermostat inputs using normal timings.  
EAC  
The EAC output can be used to drive an external relay (24 VAC coil) to  
control an electronic air cleaner. The output is energized whenever the  
blower relay on the control is energized. Models having a high effi-  
ciency non-variable speed motor use the EAC output as an input to the  
motor. The EAC output can also be used to drive an electronic air  
cleaner relay as long as the load of the EAC relay does not exceed 1.0  
Amp. An additional connection to the EAC terminals must be made  
using a piggyback terminal or similar device.  
Fan On Lock Condition  
If the limit switch opens multiple times during a single call for electric  
heat (fault code 3) or if the limit switch opens for a long duration (fault  
code 4), the control will energize the blower until power is removed from  
the control. The control will cycle the heat outputs on and off as the limit  
re-closes and opens. The constant fan operation will signal the home-  
owner that a problem has occurred and a service call is required.  
LOW FAN  
Soft Lockout  
The LOW FAN output can be used to drive an external relay (24 VAC  
coil) that switches the power input to the motor to a lower speed tap. An  
accessory kit is available for this application.  
If the limit switch opens for a second long duration period during a sin-  
gle call for heat (fault code 5), the control will keep the blower locked on  
and lock out the heat outputs for one hour. The control will only reset  
this one hour lockout when the power is removed from the control. After  
the one hour period has passed, the control will re-energize electric  
heat according to the thermostat inputs using normal timings. The  
blower will remain locked on from the first long duration limit opening.  
The LOW FAN output is energized when the control has the following  
inputs.  
TABLE 4: Low Fan Control Inputs  
Input  
G
Operational Mode  
Continuous Fan operation  
First stage compressor operation  
Hard Lockout  
The control has a hard lockout condition during which the control will  
keep all heat outputs de-energized until power is removed from the con-  
trol. The control de-energizes the blower five minutes after entering the  
hard lockout condition.  
Y1 or Y1 and O  
Y/Y2 and HUM de-energized with  
HUM STAT jumper in YES position  
Dehumidification during cooling  
Blower Delays  
If the limit switch closes and re-opens during the one hour soft lockout  
period, the control will enter a hard lockout condition and continue to  
indicate a fault code 5.  
The control includes the following blower delays:  
TABLE 5: Blower Delays  
If the limit switch opens twice when no call for electric heat is present  
(fault code 2), the control will enter a hard lockout condition.  
Condition  
Blower Delay  
60 seconds  
30 seconds  
10 seconds  
Following call for cooling  
If the limit switch opens multiple times soon after a soft lockout reset  
(fault code 6), the control will enter a hard lockout condition.  
Following call for heat pump heating  
Following call for electric heat heating  
Wiring Related Faults  
If the control receives a simultaneous call for heating and cooling (fault  
code 7), the control will perform both heating and cooling operations.  
Unitary Products Group  
7
 
819288-UIM-A-0212  
Refer to Tables to determine proper wire sizing:  
SECTION VII: LINE POWER  
CONNECTIONS  
Tables 8 & 9 for cooling only or,  
Tables 12 & 13 for single phase or,  
Tables 15 & 16 for three phase or,  
Table 18 for 460V.  
Power may be brought into the unit through the supply air end of the  
unit (top when unit is vertical) or the left side panel. Use the hole appro-  
priate to the unit’s orientation in each installation to bring conduit from  
the disconnect. The power lead conduit should be terminated at the  
electrical control box. To minimize air leakage, seal the wiring entry  
point at the outside of the unit. See Figure 3.  
ELECTRIC HEAT  
WITHOUT CIRCUIT BREAKER  
3 PHASE (10 - 15 KW)  
1 PHASE ELECTRIC HEAT  
TYPICAL WIRING WITHOUT ELECTRIC HEAT  
GND.  
GND. LUG  
WITH CIRCUIT BREAKER  
AS SHIPPED FROM FACTORY  
SINGLE SOURCE  
LUG  
GND.  
GND. LUG  
(2.5 - 25 KW) - 25 KW SHOWN  
LUG  
POWER  
SUPPLY  
GND. LUG  
GND.  
LUG  
POWER  
SUPPLY  
1 PHASE ELECTRIC HEAT  
WITH CIRCUIT BREAKER  
& BREAKER BAR REMOVED  
TERMINAL  
BLOCK  
ELECTRIC HEAT  
WITHOUT CIRCUIT BREAKER  
SINGLE SOURCE (2.5 - 10 KW)  
MULTI-SOURCE (15 - 25 KW) - 25 KW SHOWN  
GND. LUG  
POWER  
SUPPLY  
GND.  
LUG  
GND.  
GND. LUG  
(JUMPER BAR)  
LUG  
POWER  
MAY BE 1, 2, OR 3  
CIRCUIT BREAKERS  
SUPPLY 1  
POWER  
POWER  
SUPPLY 2  
SUPPLY  
POWER  
POWER WIRING (208/230-1-60)  
TERMINAL  
BLOCK  
SUPPLY 3  
NOTE: USE ONLY COPPER CONDUCTORS  
MAY BE 1, 2, OR 3  
CONNECT LEADS WITH WIRE NUTS  
(TYPICAL ALL HEAT KITS)  
CIRCUIT BREAKERS  
FIGURE 7: Line Power Connections  
3 PHASE ELECTRIC HEAT  
WITH CIRCUIT BREAKER  
MULTI-SOURCE - 25 KW  
ELECTRIC HEAT  
WITHOUT CIRCUIT BREAKER  
3 PHASE (10 - 15 KW)  
GND. LUG  
GND.  
LUG  
GND.  
LUG  
GND. LUG  
POWER  
SUPPLY 1  
POWER  
POWER  
SUPPLY  
SUPPLY 2  
TERMINAL  
BLOCK  
(2) 3-PHASE  
BREAKERS  
CONNECT TRANSFORMER LEADS WITH WIRE NUTS  
(TYPICAL ALL HEAT KITS)  
FIGURE 8: 460V - Line Power Connections  
Adjust blower motor speed to provide airflow within the minimum and  
maximum limits approved for evaporator coil, electric heat and outdoor  
unit. Speed tap adjustments are made at the motor terminal block, See  
Figure 8 or 9. Airflow data is shown in Tables 19 & 20.  
SECTION VIII: BLOWER SPEED  
CONNECTIONS  
All air handlers contain 3-speed blower motors which are prewired to  
the control board.  
Connect motor wires to motor speed tap receptacle for speed desired.  
See wiring label for motor wiring details.  
ORG  
TAPE END & CAP  
WITH WIRE NUT  
ORG  
FACTORY WIRED TO  
TRANSFORMER  
L1  
HIGH  
MED  
LOW  
ORG  
HIGH  
MED  
LOW  
CAP  
460 VOLT  
BLOWER  
MOTOR  
L1  
FACTORY WIRED TO  
FAN MOTOR RELAY  
TERMINAL ON  
CONTROL BOARD  
HIGH  
460 VOLT  
BLOWER  
MOTOR  
HIGH  
MED  
LOW  
L2  
L1  
HIGH  
L2  
460 VOLT  
BLOWER  
MOTOR  
L2  
MEDIUM  
MED  
LOW  
230 VOLT  
LOW  
BLOWER MOTOR  
GND.  
460 VOLT BLOWER MOTOR  
FIGURE 10: 460V - Blower Speed Connections  
FIGURE 9: Blower Speed Connections  
8
Unitary Products Group  
 
819288-UIM-A-0212  
SECTION IX: UNIT DATA  
TABLE 7: Physical and Electrical Data  
Models: MA  
MA08BN21  
10 x 9  
MA12BN21  
10 x 9  
MA12BN41  
10 x 9  
3/4 HP  
1075  
MA14DN21  
10 x 10  
1/2 HP  
1075  
Blower - Diameter x Width  
HP  
1/4 HP  
1075  
3/4 HP  
1075  
Motor  
Nominal RPM  
Voltage  
Amps  
208/230  
1.5  
208/230  
3.5  
460  
208/230  
2.4  
Full Load  
Type  
2.3  
DISPOSABLE OR PERMANENT  
Permanent Filter1  
Size  
16 x 20 x 1  
1PF0601BK  
75/71  
16 x 20 x 1  
1PF0601BK  
82/78  
16 x 20 x 1  
1PF0601BK  
82/78  
24 x 20 x 1  
1PF0604BK  
94/88  
Filter Bulk Pack  
Shipping / Operating Weight (lbs.)  
Models: MA  
MA16CN21  
10 x 10  
1 HP  
MA16CN41  
10 x 10  
1 HP  
MA20DN21  
11 x 10  
1 HP  
MA20DN41  
11 x 10  
1 HP  
Blower - Diameter x Width  
HP  
Motor  
Nominal RPM  
1075  
1075  
1075  
1075  
Voltage  
Amps  
208/230  
4.0  
460  
208/230  
7.4  
460  
Full Load  
Type  
2.6  
3.7  
DISPOSABLE OR PERMANENT  
Permanent Filter1  
Size  
20 x 20 x 1  
1PF0602BK  
90/84  
20 x 20 x 1  
1PF0602BK  
90/84  
24 x 20 x 1  
1PF0604BK  
97/91  
24 x 20 x 1  
1PF0604BK  
97/91  
Filter Bulk Pack  
Shipping / Operating Weight (lbs.)  
1. Field Supplied.  
TABLE 8: Electrical Data - Cooling Only (60 Hz) - 208/230  
Total Motor Amps  
Minimum Circuit Ampacity  
60 Hertz  
Max. O.C.P.1  
Amps/Type  
Models  
60 Hertz  
MA  
Minimum Wire  
Size A.W.G.  
208V  
230V  
208V  
1.8  
230V  
1.9  
08BN21  
12BN21  
14DN21  
16CN21  
20DN21  
1.4  
1.5  
3.5  
2.4  
4.0  
7.4  
15  
15  
15  
15  
15  
14  
14  
14  
14  
14  
2.1  
2.6  
3.0  
3.3  
4.1  
4.4  
3.6  
4.5  
5.0  
4.8  
6.0  
6.5  
1. OCP = Over Current Protection device, must be HACR type Circuit Breaker or Time Delay fuse.  
TABLE 9: Electrical Data - Cooling Only (60 Hz) - 460  
Max. O.C.P.1  
Amps/Type  
Total Motor Amps  
Minimum Circuit Ampacity  
Models  
MA  
Minimum Wire  
Size A.W.G.  
60 Hertz  
2.3  
60 Hertz  
3.5  
12BN41  
16CN41  
20DN41  
15  
15  
15  
14  
14  
14  
2.6  
3.9  
3.7  
5.6  
1. OCP = Over Current Protection device, must be HACR type Circuit Breaker or Time Delay fuse.  
TABLE 10: Conversion Table  
KW & MBH Conversions - for Total Power Input Requirement  
208V  
230V  
220V  
240V  
240V  
240V  
.751  
.918  
.840  
FOR  
OPERATION MULTIPLY  
TABULATED KW & MBH BY  
Unitary Products Group  
9
 
819288-UIM-A-0212  
TABLE 11: Electrical Data - 1 Ø - 208/230-1-60  
Total Heat1  
MBH  
KW Staging  
W2 Only  
Min.  
Speed  
Tap  
Models  
MA  
Heat Kit - Single  
Phase  
Max.  
Static  
KW  
W1 Only  
W1 + W2  
208V 240V 208V 240V 208V 240V 208V 240V 208V 240V  
4HK*6500206  
4HK*6500506  
4HK*6500806  
4HK*6501006  
4HK16501306  
4HK*6500506  
4HK*6500806  
4HK*6501006  
4HK16501306  
4HK165N1506  
4HK*6500506  
4HK*6500806  
4HK*6501006  
4HK16501506  
4HK16501806  
4HK16502006  
4HK*6500506  
4HK*6500806  
4HK*6501006  
4HK16501306  
4HK16501506  
4HK16501806  
4HK16502006  
4HK*6500806  
4HK*6501006  
4HK16501306  
4HK16501506  
4HK16501806  
4HK16502006  
4HK16502506  
0.5  
0.5  
0.5  
0.5  
0.5  
0.5  
0.5  
0.5  
0.5  
0.5  
0.5  
0.5  
0.5  
0.5  
0.5  
0.5  
0.5  
0.5  
0.5  
0.50  
0.5  
0.5  
0.5  
0.5  
0.5  
0.50  
0.5  
0.5  
0.5  
0.5  
Lo  
Lo  
1.9  
3.6  
2.5  
4.8  
6.4  
8.5  
1.9  
3.6  
2.8  
3.6  
3.3  
3.6  
2.8  
3.6  
3.3  
3.6  
3.6  
2.8  
3.6  
3.6  
3.3  
3.6  
3.6  
2.8  
3.6  
3.3  
3.6  
3.3  
3.6  
2.8  
3.6  
3.3  
3.6  
3.3  
3.6  
3.6  
2.5  
4.8  
3.75  
4.8  
4.3  
4.8  
3.75  
4.8  
4.3  
4.8  
4.8  
3.75  
4.8  
4.8  
4.4  
4.8  
4.8  
3.75  
4.8  
4.3  
4.8  
4.4  
4.8  
3.75  
4.8  
4.3  
4.8  
4.4  
4.8  
4.8  
1.9  
3.6  
5.6  
7.2  
6.5  
3.6  
5.6  
7.2  
6.5  
7.2  
3.6  
5.6  
7.2  
7.2  
6.6  
7.2  
3.6  
5.6  
7.2  
6.5  
7.2  
6.6  
7.2  
5.6  
7.2  
6.5  
7.2  
6.6  
7.2  
10.8  
2.5  
4.8  
7.5  
9.6  
8.6  
4.8  
7.5  
9.6  
8.6  
9.6  
4.8  
7.5  
9.6  
9.6  
8.8  
9.6  
4.8  
7.5  
9.6  
8.7  
9.6  
8.8  
9.6  
7.5  
9.6  
8.7  
9.6  
8.8  
9.6  
14.4  
1.9  
3.6  
2.5  
4.8  
12.3  
19.2  
24.6  
33.3  
12.3  
19.2  
24.6  
33.3  
36.9  
12.3  
19.2  
24.6  
36.9  
45.1  
49.2  
12.3  
19.2  
24.6  
33.3  
36.9  
45.1  
49.2  
19.2  
24.6  
33.3  
36.9  
45.1  
49.2  
61.5  
16.4  
25.6  
32.8  
44.4  
16.4  
25.6  
32.8  
44.4  
49.1  
16.4  
25.6  
32.8  
49.1  
60.1  
65.5  
16.4  
25.6  
32.8  
44.4  
49.1  
60.1  
65.5  
25.6  
32.8  
44.4  
49.1  
60.1  
65.5  
81.9  
08BN21  
12BN21  
Med  
Hi  
5.6  
7.5  
5.6  
7.5  
7.2  
9.6  
7.2  
9.6  
Hi  
9.8  
13.0  
4.8  
9.8  
13.0  
4.8  
Lo  
3.6  
3.6  
Med  
Med  
Med  
Med  
Lo  
5.6  
7.5  
5.6  
7.5  
7.2  
9.6  
7.2  
9.6  
9.8  
13.0  
14.4  
4.8  
9.8  
13.0  
14.4  
4.8  
10.8  
3.6  
10.8  
3.6  
Lo  
5.6  
7.5  
5.6  
7.5  
Med  
Med  
Hi  
7.2  
9.6  
7.2  
9.6  
14DN21  
16CN21  
10.8  
13.2  
14.4  
3.6  
14.4  
17.6  
19.2  
4.8  
10.8  
13.2  
14.4  
3.6  
14.4  
17.6  
19.2  
4.8  
Hi  
Lo  
Lo  
5.6  
7.5  
5.6  
7.5  
Med  
Med  
Med  
Hi  
7.2  
9.6  
7.2  
9.6  
9.8  
13  
9.8  
13.0  
14.4  
17.6  
19.2  
7.5  
10.8  
13.2  
14.4  
5.6  
14.4  
17.6  
19.2  
7.5  
10.8  
13.2  
14.4  
5.6  
Hi  
Lo  
Lo  
7.2  
9.6  
7.2  
9.6  
Med  
Med  
Med  
Med  
Med  
9.8  
13  
9.8  
13.0  
14.4  
17.6  
19.2  
24.0  
20DN21  
10.8  
13.2  
14.4  
18.0  
14.4  
17.6  
19.2  
24.0  
10.8  
13.2  
14.4  
18.0  
1. See conversion Table 10.  
*
May be 0 (no breaker) or 1 (with breaker).  
TABLE 12: Electrical Data - (For Multi-Source Power Supply) - Copper Wire 1 Ø - 208/230-1-60  
Max. O.C.P.1 Amps/Type  
Circuit  
Min. Circuit Ampacity  
75°C Wire Size - AWG  
Circuit  
2nd  
Circuit  
Models  
MA  
Heater  
Model  
1st  
3rd  
1st  
2nd  
3rd  
1st  
2nd  
3rd  
208/240  
41.8/49.5  
47.5/54.4  
47.8/55.0  
44.2/50.8  
47.8/55.0  
42.2/48.9  
47.8/55.0  
44.2/50.8  
47.8/55.0  
43.5/49.9  
49.3/56.5  
45.7/52.3  
49.3/56.5  
49.3/56.5  
208/240  
19.5/22.5  
21.7/25.0  
21.7/25.0  
39.7/45.8  
43.3/50.0  
22.9/26.0  
21.7/25.0  
39.7/45.8  
43.3/50.0  
24.2/27.0  
21.7/25.0  
39.7/45.8  
43.3/50.0  
43.3/50.0  
208/240  
208/240 208/240 208/240 208/240 208/240 208/240  
4HK16501306  
4HK165N1506  
4HK16501506  
4HK16501806  
4HK16502006  
4HK16501306  
4HK16501506  
4HK16501806  
4HK16502006  
4HK16501306  
4HK16501506  
4HK16501806  
4HK16502006  
4HK16502506  
45/50  
50/60  
50/60  
50/60  
50/60  
50/50  
50/60  
50/60  
50/60  
50/50  
50/60  
50/60  
50/60  
50/60  
20 / 25  
25 / 25  
25 / 25  
40 / 50  
45 / 50  
30/30  
8/8  
8/6  
8/6  
8/6  
8/6  
6/6  
8/6  
8/6  
8/6  
6/6  
8/6  
8/6  
8/6  
8/6  
10/10  
10/10  
10/10  
8/8  
12BN21  
14DN21  
8/8  
12/10  
10/10  
8/8  
25 / 25  
40 / 50  
45 / 50  
30/30  
16CN21  
20DN21  
8/8  
10/10  
10/10  
8/8  
25 / 25  
40 / 50  
45 / 50  
45 / 50  
8/8  
21.7/25.0  
25/25  
8/8  
10/10  
1. O.C.P. = Over Current Protection device, must be HACR type Circuit Breaker or Time Delay fuse.  
10  
Unitary Products Group  
 
819288-UIM-A-0212  
TABLE 13: Electrical Data - (For Single Source Power Supply) - Copper Wire 1 Ø - 208/230-1-60  
Field Wiring  
Heater  
Models  
MA  
Heat Kit - Single  
Phase*  
Max. O.C.P.1 Amps/Type  
Amps  
Min. Circuit Ampacity  
75°C Wire Size - AWG  
240V  
10.4  
20.0  
31.3  
40.0  
54.2  
20.0  
31.3  
40.0  
54.2  
60.0  
20.0  
31.3  
40.0  
60.0  
73.3  
80.0  
20.0  
31.3  
40.0  
54.2  
60.0  
73.3  
80.0  
31.3  
40.0  
54.2  
60.0  
73.3  
80.0  
100.0  
208V  
13.03  
23.42  
35.60  
45.08  
60.4  
240V  
14.88  
26.88  
41.00  
51.88  
69.6  
208V  
15  
30  
40  
50  
70  
240V  
15  
208V  
14  
10  
8
240V  
14  
10  
8
4HK*6500206  
4HK*6500506  
4HK*6500806  
4HK*6501006  
4HK16501306  
4HK*6500506  
4HK*6500806  
4HK*6501006  
4HK16501306  
4HK165N1506  
4HK*6500506  
4HK*6500806  
4HK*6501006  
4HK16501506  
4HK16501806  
4HK16502006  
4HK*6500506  
4HK*6500806  
4HK*6501006  
4HK16501306  
4HK16501506  
4HK16501806  
4HK16502006  
4HK*6500806  
4HK*6501006  
4HK16501306  
4HK16501506  
4HK16501806  
4HK16502006  
4HK16502506  
30  
08BN21  
12BN21  
45  
60  
8
6
70  
4
4
25.79  
37.98  
47.46  
61.3  
29.38  
43.50  
54.38  
72.1  
30  
40  
50  
70  
30  
10  
8
10  
8
45  
60  
8
6
90  
4
3
69.13  
24.29  
36.48  
45.96  
67.63  
82.07  
89.29  
26.17  
38.35  
47.83  
65.2  
79.38  
28.00  
42.13  
53.00  
78.00  
94.63  
103.00  
30.00  
44.13  
55.00  
74.80  
80.00  
96.63  
105.00  
48.38  
59.25  
77.00  
84.25  
100.88  
109.25  
134.25  
70  
30  
40  
50  
70  
90  
4
3
30  
8
10  
8
45  
8
60  
8
6
14DN21  
16CN21  
90  
4
3
90  
100  
110  
30  
4
3
100  
30  
40  
50  
70  
3
2
8
8
45  
8
8
60  
8
6
80  
4
2
69.50  
83.94  
91.17  
42.60  
52.08  
67.7  
70  
90  
4
3
90  
100  
110  
50  
4
3
100  
45  
60  
70  
3
2
8
8
60  
8
6
80  
4
2
20DN21  
73.75  
88.19  
95.42  
117.08  
90  
90  
3
3
90  
110  
125  
150  
3
2
100  
125  
3
2
1
1/0  
1. O.C.P. = Over Current Protection device, must be HACR type Circuit Breaker or Time Delay fuse.  
May be 0 (no breaker) or 1 (with breaker).  
*
TABLE 14: Electrical Data - 3 Ø - 208/230-3-60  
Total Heat1  
MBH  
KW Staging  
W2 Only  
Min.  
Speed  
Tap  
Models  
MA  
Heat Kit -  
Three Phase  
Max.  
Static  
KW  
W1 Only  
W1 + W2  
208V 240V 208V 240V 208V 240V 208V 240V 208V 240V  
08B  
12B  
4HK06501025  
4HK06501025  
4HK065N1525  
4HK06501025  
4HK06501525  
4HK06501825  
4HK06501025  
4HK06501525  
4HK06501825  
4HK06501025  
4HK06501525  
4HK16501825  
4HK16502525  
0.5  
0.5  
0.5  
0.5  
0.5  
0.5  
0.5  
0.5  
0.5  
0.5  
0.5  
0.5  
0.5  
Hi  
7.2  
7.2  
9.6  
9.6  
24.6  
24.6  
36.9  
24.6  
36.9  
44.7  
24.6  
36.9  
44.7  
24.6  
36.9  
44.7  
61.4  
32.8  
32.8  
49.1  
32.8  
49.1  
58.7  
32.8  
49.1  
58.7  
32.8  
49.1  
58.7  
81.4  
7.2  
7.2  
9.6  
9.6  
7.2  
7.2  
9.6  
9.6  
7.2  
7.2  
9.6  
9.6  
Med  
Hi  
10.8  
7.2  
14.4  
9.6  
10.8  
7.2  
14.4  
9.6  
10.8  
7.2  
14.4  
9.6  
10.8  
7.2  
14.4  
9.6  
Med  
Med  
Hi  
14D  
16C  
10.8  
12.9  
7.2  
14.4  
17.2  
9.6  
10.8  
12.9  
7.2  
14.4  
17.2  
9.6  
10.8  
12.9  
7.2  
14.4  
17.2  
9.6  
10.8  
12.9  
7.2  
14.4  
17.2  
9.6  
Med  
Med  
Hi  
10.8  
12.9  
7.2  
14.4  
17.2  
9.6  
10.8  
12.9  
7.2  
14.4  
17.2  
9.6  
10.8  
12.9  
7.2  
14.4  
17.2  
9.6  
10.8  
12.9  
7.2  
14.4  
17.2  
9.6  
Lo  
Med  
Med  
Med  
10.8  
12.9  
18.0  
14.4  
17.2  
24.0  
10.8  
12.9  
9.0  
14.4  
17.2  
12.0  
10.8  
12.9  
18.0  
14.4  
17.2  
24.0  
10.8  
12.9  
18.0  
14.4  
17.2  
24.0  
20D  
1. See conversion Table 10.  
Unitary Products Group  
11  
 
819288-UIM-A-0212  
TABLE 15: Electrical Data - (For Multi-Source Power Supply) - Copper Wire 3 Ø - 208/230-3-60  
Max. O.C.P.1 Amps/Type  
Min. Circuit Ampacity  
75°C Wire Size - AWG  
Circuit  
2nd  
Circuit  
2nd  
Circuit  
Models  
MA  
Heater  
Model  
1st  
3rd  
1st  
3rd  
1st  
2nd  
3rd  
208/240  
31.1/35.1  
40.0/45.4  
208/240  
22.4/25.9  
31.3/36.1  
208/240  
208/240 208/240 208/240 208/240 208/240 208/240  
4HK16501825  
4HK16502525  
35/40  
40/50  
25/35  
35/40  
8/8  
8/8  
10/10  
8/8  
20D  
1. O.C.P. = Over Current Protection device, must be HACR type Circuit Breaker or Time Delay fuse.  
TABLE 16: Electrical Data - (For Single Source Power Supply) - Copper Wire 3 Ø - 208/230-3-60  
Field Wiring  
Heater  
Amps  
240V  
Models  
MA  
Heat Kit -  
Three Phase  
Max. O.C.P.1 Amps/Type  
Min. Circuit Ampacity  
75°C Wire Size - AWG  
208V  
26.8  
27.6  
40.1  
29.1  
41.6  
48.9  
29.5  
42.0  
49.3  
33.8  
43.5  
240V  
30.8  
31.9  
47.8  
33.3  
46.4  
56.1  
33.9  
48.4  
56.8  
38.1  
52.6  
208V  
30  
30  
45  
30  
45  
50  
30  
45  
50  
35  
45  
240V  
35  
35  
50  
35  
50  
60  
35  
50  
60  
40  
60  
208V  
10  
10  
8
240V  
08B  
12B  
4HK06501025  
4HK06501025  
4HK065N1525  
4HK06501025  
4HK06501525  
4HK06501825  
4HK06501025  
4HK06501525  
4HK06501825  
4HK06501025  
4HK06501525  
23.1  
23.1  
34.7  
23.1  
34.7  
41.4  
23.1  
34.7  
41.4  
23.1  
34.7  
8
8
8
8
8
6
8
8
6
8
6
10  
8
14D  
8
10  
8
16C  
20D  
6
8
8
1. O.C.P. = Over Current Protection device, must be HACR type Circuit Breaker or Time Delay fuse.  
2. Heaters are 3 Phase.  
TABLE 17: Electrical Data - 460-3-60  
Total Heat1  
KW Staging  
MAX. STATIC & MIN. CFM  
MA  
Heater  
KW  
MBH  
480V  
3.28  
3.28  
4.92  
3.28  
4.92  
9.84  
W1 Only W2 Only W1 + W2  
Models  
Models  
Static  
0.5”  
0.5”  
0.5”  
0.5”  
0.5”  
0.5”  
Taps  
Med  
Med  
Med  
Med  
Med  
Med  
480V  
9.6  
480V  
9.6  
480V  
9.6  
480V  
9.6  
12BN41  
16CN41  
4HK06501046  
4HK06501046  
4HK06501546  
4HK06501046  
4HK06501546  
4HK06502946  
9.6  
9.6  
9.6  
9.6  
14.4  
9.6  
14.4  
9.6  
14.4  
9.6  
14.4  
9.6  
20DN41  
14.4  
28.8  
14.4  
14.4  
14.4  
28.8  
14.4  
28.8  
TABLE 18: Electrical Data - (For Single Source Power Supply) - Copper Wire 3 Ø - 460-3-60  
Field Wiring  
MA  
Models  
Heater  
Models  
Wire Size - AWG  
75°C  
Min. Circuit Ampacity  
Max. O.C.P.1 Amps/Type  
480V  
17.4  
17.8  
24.9  
19.1  
26.3  
48.0  
480V  
20  
480V  
12  
10  
10  
10  
8
12BN41  
16CN41  
4HK06501046  
4HK06501046  
4HK06501546  
4HK06501046  
4HK06501546  
4HK06502946  
25  
25  
25  
20DN41  
30  
50  
8
1. OCP = Over Current Protection device, must be HACR type Circuit Breaker or Time Delay fuse.  
12  
Unitary Products Group  
 
819288-UIM-A-0212  
TABLE 19: Air Flow Data - 60 Hz Models (230 & 460 Volt)  
230 / 460 Volt - 60 Hz  
Models  
MA  
Models  
MC  
Blower Motor  
Speed  
CFM1 @ External Static Pressure - IWC  
0.1  
0.2  
0.3  
0.4  
0.5  
0.6  
0.7  
405  
0.8  
289  
0.9  
173  
84  
1
High  
Med.  
Low  
1102  
831  
986  
870  
754  
638  
521  
57  
MC18B  
MC24B  
737  
644  
551  
457  
364  
271  
178  
N/A  
N/A  
114  
25  
615  
537  
458  
379  
300  
221  
142  
63  
N/A  
225  
116  
08B  
High  
Med.  
Low  
1112  
851  
1001  
759  
890  
780  
669  
558  
447  
336  
667  
576  
484  
392  
300  
208  
643  
562  
480  
399  
317  
236  
154  
73  
N/A  
534  
453  
405  
673  
608  
582  
585  
441  
364  
727  
587  
567  
852  
726  
669  
796  
628  
680  
953  
821  
751  
802  
722  
684  
1033  
973  
896  
772  
679  
652  
1465  
1406  
1292  
1469  
1416  
1311  
1556  
1498  
1381  
N/A  
375  
220  
212  
673  
609  
582  
464  
220  
190  
508  
503  
392  
N/A  
N/A  
N/A  
581  
450  
445  
810  
533  
712  
577  
493  
456  
910  
884  
801  
543  
475  
487  
1328  
1254  
1151  
1368  
1295  
1200  
1472  
1369  
1245  
High  
Med.  
Low  
1429  
1213  
1075  
1607  
1308  
1148  
1462  
1205  
1075  
1715  
1471  
1379  
1763  
1487  
1381  
1746  
1486  
1392  
1959  
1631  
1447  
1825  
1637  
1510  
2018  
1684  
1561  
1830  
1638  
1522  
2226  
2115  
N/A  
1363  
1153  
1032  
1533  
1258  
1108  
1396  
1154  
1020  
1671  
1438  
1330  
1713  
1462  
1353  
1699  
1442  
1336  
1874  
1587  
1431  
1742  
1572  
1456  
1895  
1595  
1476  
1748  
1573  
1479  
2190  
2087  
N/A  
1290  
1097  
990  
1212  
1037  
927  
1133  
977  
1037  
896  
929  
670  
MC30B  
MC35B  
697  
549  
873  
770  
611  
494  
High  
Med.  
Low  
1463  
1197  
1061  
1322  
1102  
969  
1395  
1146  
1017  
1254  
1046  
906  
1319  
1097  
976  
1044  
887  
851  
725  
12B  
MC36B  
MC43B  
MC48D  
MC60D  
MC62D  
MC42C  
742  
648  
807  
690  
613  
High  
Med.  
Low  
1172  
980  
1067  
897  
941  
693  
704  
560  
842  
735  
592  
470  
High  
Med.  
Low  
1608  
1367  
1276  
1649  
1412  
1292  
1655  
1393  
1285  
1802  
1542  
1401  
1660  
1507  
1403  
1772  
1506  
1392  
1670  
1510  
1426  
2103  
2017  
N/A  
1547  
1318  
1227  
1581  
1356  
1225  
1579  
1333  
1226  
1708  
1473  
1363  
1578  
1431  
1341  
1649  
1417  
1308  
1590  
1443  
1364  
2035  
1951  
1716  
2107  
2008  
1718  
2191  
2069  
1817  
1460  
1263  
1157  
1511  
1280  
1186  
1486  
1270  
1158  
1606  
1395  
1304  
1486  
1361  
1278  
1525  
1328  
1223  
1518  
1370  
1314  
1931  
1851  
1643  
2027  
1944  
1676  
2139  
1986  
1723  
1338  
1180  
1047  
1407  
1210  
1057  
1399  
1189  
1061  
1486  
1315  
1241  
1396  
1276  
1202  
1402  
1240  
1139  
1428  
1289  
1218  
1845  
1744  
1554  
1906  
1852  
1600  
1951  
1862  
1646  
1232  
920  
1003  
824  
866  
681  
High  
Med.  
Low  
1276  
1087  
863  
995  
14D  
16C  
20D  
795  
780  
High  
Med.  
Low  
1264  
1081  
882  
1093  
776  
740  
High  
Med.  
Low  
1408  
1218  
1098  
1306  
1171  
1088  
1279  
1151  
1055  
1320  
1185  
1114  
1683  
1542  
1451  
1786  
1692  
1447  
1859  
1727  
1514  
1264  
967  
844  
High  
Med.  
Low  
1187  
1043  
785  
MC43C  
MC35C  
High  
Med.  
Low  
1156  
1062  
970  
MC48C  
MC60C  
MC48D  
MC60D  
MC62D  
High  
Med.  
Low  
1199  
992  
885  
High  
Med.  
Low  
1541  
1466  
1379  
1538  
1499  
1389  
1656  
1566  
1442  
High  
Med.  
Low  
2326  
2150  
2012  
2357  
2212  
2066  
2235  
2089  
1923  
2321  
2144  
1934  
2192  
2036  
1834  
2254  
2111  
1910  
High  
Med.  
Low  
1. Includes return air filter, coil, and 10kW electric heater.  
All MA series air handler units are UL Listed up to 0.50" w.c. external static pressure, including air filter, wet coil, and largest KW size heater.  
Unitary Products Group  
13  
 
819288-UIM-A-0212  
TABLE 20: Air Flow Data - 60 Hz Models (208 Volt)  
208 Volt - 60 Hz  
Models  
MA  
Models  
MC  
Blower Motor  
Speed  
CFM1 @ External Static Pressure - IWC  
0.1  
0.2  
0.3  
0.4  
0.5  
0.6  
499  
0.7  
383  
0.8  
267  
126  
N/A  
288  
156  
24  
0.9  
150  
42  
1
High  
Med.  
Low  
1080  
712  
964  
848  
732  
615  
34  
MC18B  
MC24B  
628  
544  
461  
377  
293  
210  
N/A  
N/A  
73  
529  
452  
376  
299  
223  
146  
70  
N/A  
180  
72  
08B  
High  
Med.  
Low  
1039  
743  
932  
825  
717  
610  
502  
395  
659  
575  
491  
407  
323  
239  
N/A  
N/A  
377  
211  
214  
N/A  
N/A  
N/A  
442  
220  
209  
548  
392  
358  
572  
469  
347  
549  
398  
462  
557  
493  
424  
504  
457  
410  
921  
782  
742  
544  
475  
419  
1342  
1245  
1081  
1370  
1213  
1128  
1298  
1182  
1088  
532  
460  
387  
315  
242  
169  
97  
N/A  
534  
415  
351  
95  
High  
Med.  
Low  
1399  
1080  
932  
1339  
1039  
895  
1267  
994  
1192  
943  
1098  
876  
1023  
778  
915  
673  
525  
447  
262  
187  
129  
721  
534  
477  
936  
684  
625  
850  
687  
638  
813  
744  
554  
985  
791  
725  
1102  
791  
753  
1157  
948  
868  
1178  
834  
725  
1553  
1440  
1285  
1574  
1472  
1308  
1496  
1420  
1258  
MC30B  
MC35B  
639  
868  
829  
776  
656  
543  
High  
Med.  
Low  
1434  
1083  
933  
1267  
955  
1099  
827  
932  
764  
597  
430  
12B  
MC36B  
MC43B  
MC48D  
MC60D  
MC62D  
MC42C  
699  
571  
443  
315  
59  
818  
703  
588  
473  
359  
244  
14  
High  
Med.  
Low  
1444  
1086  
942  
1377  
1047  
920  
1311  
1005  
887  
1247  
959  
1172  
905  
1091  
819  
971  
573  
438  
366  
658  
548  
493  
739  
564  
507  
755  
590  
532  
798  
669  
561  
721  
663  
550  
1039  
865  
805  
777  
627  
583  
1461  
1355  
1195  
1478  
1387  
1213  
1435  
1315  
1184  
647  
827  
768  
655  
536  
High  
Med.  
Low  
1549  
1275  
1190  
1545  
1266  
1192  
1564  
1303  
1204  
1782  
1468  
1310  
1771  
1486  
1314  
1983  
1529  
1312  
1819  
1489  
1321  
2250  
1953  
N/A  
1498  
1269  
1162  
1490  
1248  
1186  
1520  
1262  
1161  
1712  
1415  
1278  
1705  
1445  
1300  
1865  
1446  
1249  
1738  
1452  
1310  
2180  
1956  
N/A  
1448  
1225  
1112  
1463  
1207  
1126  
1455  
1225  
1104  
1619  
1355  
1239  
1619  
1393  
1258  
1747  
1363  
1185  
1657  
1409  
1271  
2139  
1905  
1544  
2144  
1926  
1521  
2092  
1913  
N/A  
1383  
1181  
1074  
1378  
1140  
1067  
1400  
1165  
1060  
1524  
1298  
1185  
1528  
1325  
1214  
1629  
1280  
1122  
1570  
1349  
1233  
2062  
1858  
1538  
2073  
1887  
1523  
2054  
1862  
1546  
1325  
1115  
975  
1235  
997  
1125  
811  
817  
737  
High  
Med.  
Low  
1337  
1101  
992  
1231  
1005  
842  
1115  
839  
14D  
16C  
20D  
740  
High  
Med.  
Low  
1336  
1117  
1001  
1435  
1233  
1125  
1450  
1265  
1164  
1511  
1197  
1059  
1491  
1293  
1184  
1971  
1755  
1455  
2003  
1836  
1507  
1910  
1766  
1491  
1257  
1028  
870  
1154  
827  
745  
High  
Med.  
Low  
1323  
1144  
1045  
1361  
1198  
1108  
1393  
1114  
995  
1213  
1005  
934  
High  
Med.  
Low  
1261  
1041  
891  
MC35C  
MC43C  
High  
Med.  
Low  
1275  
1031  
932  
MC48C  
MC60C  
MC48D  
MC60D  
MC62D  
High  
Med.  
Low  
1396  
1207  
1120  
1855  
1649  
1401  
1921  
1761  
1436  
1762  
1661  
1407  
1289  
1112  
1022  
1683  
1528  
1346  
1809  
1643  
1379  
1595  
1513  
1354  
High  
Med.  
Low  
High  
Med.  
Low  
2251  
1987  
1492  
2208  
1959  
N/A  
2186  
1945  
1517  
2123  
1945  
N/A  
High  
Med.  
Low  
1. Includes return air filter, coil, and 10kW electric heater.  
All MA series air handler units are UL Listed up to 0.50" w.c. external static pressure, including air filter, wet coil, and largest KW size heater.  
14  
Unitary Products Group  
 
819288-UIM-A-0212  
MA SERIES - Air Handler Control Wiring  
Typical A/C - Cooling only Applications  
MA SERIES - Air Handler Control Wiring  
Typical A/C with Electric Heat Applications  
AIR HANDLER  
AIR HANDLER  
THERMOSTAT  
THERMOSTAT  
1 - STAGE  
AIR CONDITIONING  
1 - STAGE  
BOARD  
BOARD  
AIR CONDITIONING  
R
G
R
R
G
Y
R
G
G
Y
Y / Y2  
Y
Y / Y2  
Y
W1  
W2  
C
Y1  
Y1  
W2  
W2  
W2  
*
*
W1  
O
W1  
O
HUMIDISTAT  
HUMIDISTAT  
W1  
C
HUM  
X / L  
COM  
HUM  
X / L  
COM  
C
C
FIGURE 11: Cooling Models with Electric Heat Wiring  
*
Optional dehumidification humidistat switch contacts open on humidity rise.  
Notes:  
1. “Y” Terminal on Air Handler Control Board must be connected for full CFM and applications requiring 60 second blower off delay for SEER enhancement.  
2. Move HUM STAT Jumper on AH Control Board to YES position if Humidistat is used.  
3. MODE Jumper on AH control board should be set to A/C for air conditioners.  
CONTROL WIRING - AHP or MA Series Air Handler  
And Newer UPG Single Stage HP Systems  
Single Stage H/P with Standard Demand Defrost Control Board  
AIR HANDLER  
HEAT PUMP  
BOARD  
THERMOSTAT  
R
R
R
G
Y
G
Y / Y2  
Y1  
Y
W2  
E
W2  
W1 66  
W
W1  
W / W1  
O
O
O
*
HUMIDISTAT  
HUM  
X / L  
COM  
X / L  
C
X / L  
C
FIGURE 12: Single-Stage Cooling Wiring  
*
Optional dehumidification humidistat switch contacts open on rise.  
Notes:  
1. “Y” Terminal on Air Handler Control Board must be connected for full CFM and applications requiring 60 second blower off delay for SEER enhancement.  
2. Move HUM STAT Jumper on AH Control Board to YES position if Humidistat is used.  
3. MODE Jumper on AH control board should be set to HP for heat pumps.  
4. To change quantity of heat during HP defrost cycle - Reverse connections at W1 & W2 on Air Handler Control Board.  
SECTION X: MAINTENANCE  
LUBRICATION  
Filters must be cleaned or replaced when they become dirty. Inspect at  
The bearings of the blower motor are permanently lubricated.  
least once per month. The frequency of cleaning depends upon the  
hours of operation and the local atmospheric conditions. Clean filters  
keep unit efficiency high.  
Unitary Products Group  
15  
 
SECTION XI: WIRING DIAGRAM  
FIGURE 13: Wiring Diagram  
Subject to change without notice. Published in U.S.A.  
819288-UIM-A-0212  
Copyright © 2012 by Johnson Controls, Inc. All rights reserved.  
Supersedes: 262675-UIM-F-1010  
Johnson Controls Unitary Products  
5005 York Drive  
Norman, OK 73069  
 

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