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.
4
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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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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
6
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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.
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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
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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
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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
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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
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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
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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.
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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.
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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.
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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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