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INSTALLATION MANUAL
MODULAR
NON-VARIABLE SPEED AIR HANDLERS
ISO 9001
MODELS: MA
LIST OF SECTIONS
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
UNIT INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
ELECTRIC HEATER INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . 5
LOW VOLTAGE CONTROL CONNECTIONS . . . . . . . . . . . . . . . . . . 5
LIST OF FIGURES
Typical Installation with MC or FC Evaporator Coil . . . . . . . . . . . . . . .3
Coil and Air Handler Attachment Details . . . . . . . . . . . . . . . . . . . . . . .3
Dimensions & Duct Connection Dimensions . . . . . . . . . . . . . . . . . . . . 4
Typical Horizontal Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Line Power Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
LIST OF TABLES
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Low Voltage Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Fault Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
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) -
Copper Wire 1 Ø - 208/230-1-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
REQUIRED CONTROL SET-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
LINE POWER CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
BLOWER SPEED CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . .8
UNIT DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
460V - Line Power Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Blower Speed Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
460V - Blower Speed Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Cooling Models with Electric Heat Wiring . . . . . . . . . . . . . . . . . . . . . .15
Two-Stage Cooling Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
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
Certified Quality
Management System
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.
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 horizontal position.
Top and side power wiring and control wiring, accessible screw terminals for control wiring and easy to install electric heaters all combine to
make the installation easy, and minimize installation cost.
SECTION II: SAFETY
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
avoided, will result in death or serious injury
.
WARNING indicates a potentially hazardous situation, which, if not
avoided, could result in death or serious injury
CAUTION indicates a potentially hazardous situation, which, if not
avoided may result in minor or moderate injury.
alert against unsafe practices and hazards involving only property damage.
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 maintenance can cause injury or property damage. Refer to this manual
for assistance or for additional information, consult a qualified contractor, installer or service agency.
This product must be installed in strict compliance with the installation instructions and any applicable local, state, and national codes
including, but not limited to building, electrical, and mechanical
codes.
.
It is also used to
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FIRE OR ELECTRICAL HAZARD
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.
1. Install this air handler only in a location and position as specified in
SECTION III of these instructions.
2. Always install the air handler to operate within the air handler’s
intended maximum outlet air temperature. Only connect the air
handler to a duct system which has an external static pressure
within the allowable range, as specified on the air handler rating
plate.
3. When an air handler is installed so that supply ducts carry air circulated by the air handler to areas outside the space containing
the air handler, the return air shall also be handled by duct(s)
sealed to the air handler casing and terminating outside the space
containing the air handler.
4. The air handler is not to be used for temporary heating of buildings
or structures under construction.
5. The size of the unit should be based on an acceptable heat loss or
gain calculation for the structure. ACCA, Manual J or other
approved methods may be used.
SAFETY REQUIREMENTS
1. This air handler should be installed in accordance with all national
and local building/safety codes and requirements, local plumbing
or wastewater codes, and other applicable codes.
2. Refer to the unit rating plate for the air handler model number, and
then see the dimensions page of this instruction for supply air plenum dimensions in Figure 3. The plenum must be installed according to the instructions.
3. Provide clearances from combustible materials as listed under
Clearances to Combustibles.
4. Provide clearances for servicing ensuring that service access is
allowed for electric heaters and blower.
5. Failure to carefully read and follow all instructions in this manual
can result in air handler malfunction, death, personal injury and/or
property damage.
6. Check the rating plate and power supply to be sure that the electrical characteristics match.
7. Air handler shall be installed so the electrical components are protected from water.
8. Installing and servicing heating/cooling equipment can be hazardous due to the electrical components. Only trained and qualified
personnel should install, repair, or service heating/cooling equipment. Untrained service personnel can perform basic maintenance
functions such as cleaning and replacing the air filters. When
working on heating/cooling equipment, observe precautions in the
manuals and on the labels attached to the unit and other safety
precautions that may apply.
9. These instructions cover minimum requirements and conform to
existing national standards and safety codes. In some instances
these instructions exceed certain local codes and ordinances,
especially those who have not kept up with changing residential
and non-HUD modular home construction practices. These
instructions are required as a minimum for a safe installation.
INSPECTION
As soon as a unit is received, it should be inspected for possible damage during transit. If damage is evident, the extent of the damage
should be noted on the carrier’s freight bill. A separate request for
inspection by the carrier’s agent should be made in writing. Also, before
installation the unit should be checked for screws or bolts, which may
have loosened in transit. There are no shipping or spacer brackets
which need to be removed.
Also check to be sure all accessories such as heater kits, suspension
kits, and coils are available. Installation of these accessories or field
conversion of the unit should be accomplished before setting the unit in
place or connecting any wiring, electric heat, ducts or piping.
LIMITATIONS
These units must be wired and installed in accordance with all national
and local safety codes.
Voltage limits are as follows:
1
Air Handler Voltage Voltage code
208/230-1-60 21 187-253
460-3-60 41 432-504
1. Rated in accordance with ARI Standard 110, utilization range “A”.
Airflow must be within the minimum and maximum limits approved for
electric heat, evaporator coils and outdoor units.
Entering Air Temperature Limits
Wet Bulb Temp.°F Dry Bulb Temp. °F
Min. Max. Min. Max.
57 72 65 95
Normal Operating
Voltage Range
SECTION III: UNIT INSTALLATION
CLEARANCES
Clearances must be taken into consideration, and provided for as follows:
1. Refrigerant piping and connections - minimum 12” recommended.
2. Maintenance and servicing access - minimum 36” from front of unit
recommended for blower motor / coil replacement.
3. Condensate drain lines routed to clear filter and panel access.
4. Filter removal - minimum 36” recommended.
5. A combustible floor base accessory is available for downflow
applications of this unit, if required by local code.
LOCATION
Location is usually predetermined. Check with owner’s or dealer’s
installation plans. If location has not been decided, consider the following in choosing a suitable location:
1. Select a location with adequate structural support, space for service access, clearance for air return and supply duct connections.
2. Use hanging brackets to wall mount unit as shown.
3. Normal operating sound levels may be objectionable if the air handler is placed directly over some rooms such as bedrooms, study,
etc.
4. Select a location that will permit installation of condensate line to
an open drain or outdoors allowing condensate to drain away from
structure.
5. When an evaporator coil is installed in an attic or above a finished
ceiling, an auxiliary drain pan should be provided under the air
handler as is specified by most local building codes.
6. Proper electrical supply must be available.
NOTE: In severe high humidity, high temperature indoor unit environments, seal completely with adequate fiberglass insulation using vapor
barrier on the outside.
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Horizontal Right
262675-UIM-A-0806
Up Flow
Down Flow
FIGURE 1: Typical Installation with MC or FC Evaporator Coil
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.
If the unit is to be installed with an evaporator coil, refer to Figure 1 for
unit positioning information.
TIE PLATE
AIR HANDLER
COIL
COIL
UPFLOW & HORIZONTAL
APPLICATIONS
DOWNFLOW
APPLICATION
TOP PLATE
AIR HANDLER
Horizontal Left
AIR HANDLER AND COIL DOWNFLOW
INSTRUCTIONS
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.
NOTE: Tie plate and screws are provided with coils.
4. Attach tie plate to casings of air handler and coil using screws.
5. Remove blower access panel and coil filter door.
6. Fasten duct flanges of coil to base of air handler with screws. See
Figure 2.
7. Secure base of air handler to base of coil using screws.
8. Complete electrical and blower speed connections as outlined in
other sections of this document.
9. Reposition and replace blower access panel.
Blowers with an electric heater kit may require a non-combustible
floor base if installing on a combustible floor. See instructions for
1FB1817, 1FB1821, & 1FB1824, and local codes.
FIGURE 2: Coil and Air Handler Attachment Details
AIR HANDLER AND COIL UPFLOW AND
HORIZONTAL INSTRUCTIONS
1. Apply neoprene gasket to top of coil.
2. Position blower casing over coil opening.
NOTE: Tie plate and screws are provided with coils.
3. Attach tie plate to casings of air handler and coil using screws.
4. Remove blower access panel.
5. Fasten duct flanges of coil to duct flanges of air handler with
screws. See Figure 2.
6. Secure base of air handler to top of coil using screws.
7. Complete electrical and blower speed connections as outlined in
other sections of this document.
8. Reposition and replace blower access panel.
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262675-UIM-A-0806
J
K
B
FIGURE 3: Dimensions & Duct Connection Dimensions
TABLE 1:
Dimensions
MA
MODELS
ABDEJK
Height Width Power Control
08B
12B 17-1/2 16-1/2 14-19/32
14D 24-1/2 23-1/2 21-19/32
25
16C 21 20 18-3/32
20D 24-1/2 23-1/2 21-19/32
1. Actual size (Conduit size).
10-3/8”
A
CIRCUIT BREAKER
PANEL
22”
20-1/2”
Dimensions
17-1/2 16-1/2 14-19/32
E
TOP OUTLET
DIMENSIONS
D
BOTTOM INLET
DIMENSIONS
Wiring Knockouts
7/8” (1/2”)
1 3/8” (1”)
1 23/32” (1 1/4”)
1
7/8” (1/2”)
DUCT CONNECTORS
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 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 installation that the duct system be properly designed and installed.
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.
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 absorption of moisture from the surrounding air into the insulation.
The supply air duct should be properly sized by use of a transition to
match unit opening. All ducts should be suspended using flexible hangers 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.
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 Ventilating Systems, NFPA No. 90B.
AIR FILTERS
Air filters and filter racks must be field supplied.
.
Equipment should never be operated without filters.
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.
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262675-UIM-A-0806
HORIZONTAL SUSPENSION
For suspension of these units in horizontal applications, it is recommended to use angle steel support brackets with threaded rods, supporting the units from the bottom, at the locations shown in Figure 4.
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
2
WW
Units
(Nominal Tons)
XX
Dimension
WW XX YY
1-1/2 - 3 Ton 16” 48” 22”
3-1/2 - 5 Ton 24” 53” - 58” 22”
FIGURE 4: Typical Horizontal Installation
1-1/2
YY
SECTION IV: ELECTRIC HEATER
INSTALLATION
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.
The HEAT ENABLE jumper (See Figure 5) must be moved to the HEA T
position to enable operation of the heater.
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 electrical supply wiring size required for listed combination of Air Handler and
Heater Kit.
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.
HEAT ENABLE
JUMPER
LOW FAN
RELAY OUTPUT
MODE JUMPER
HUM STAT JUMPER
FUSE
FIGURE 5: Control Board
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 connected to a 208 volt power supply, the low voltage transformer must be
rewired to the 208 volt tap. See the unit wiring label.
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.
HUM OUT
RELAY OUTPUT
EAC
RELAY OUTPUT
SPARE JUMPER
Remove desired knockout and pierce foil faced insulation to allow wiring to pass through. Use as small of a hole as possible to minimize air
leakage.
Install a 7/8” plastic bushing in the selected hole and keep low voltage
wiring as short as possible inside the control box.
To further minimize air leakage, seal the wiring entry point at the outside
of the unit.
The field wiring is to be connected at the screw terminals of the control
board. Refer to Figures 10 & 11.
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262675-UIM-A-0806
NOTE: All wiring must comply with local and national electrical code
requirements. Read and heed all unit caution labels.
NOTE: 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.
TABLE 2:
Low Voltage Connections
Terminal Signal Comment
R 24 VAC power (fused)
G Continuous Fan operation
Y/Y2
HUM Humidity switch input
COM 24 VAC common
Second or full stage
compressor operation
First stage compressor
Y1
operation
W2 Second stage heat operation
W1 First stage heat operation
O Reversing valve operation
Connection point for
X/L
heat pump fault indicator
Not used with outdoor units
having one stage compressors.
24 VAC will be present at this
terminal when the MODE
jumper is in the AC position.
This is normal.
24 VAC will be present at this
terminal when the HUM STAT
jumper is in the NO position.
This is normal.
This terminal is a connection
point only and does not affect
air handler control operation.
The low voltage connections may be connected to the screw terminals
or the quick connect terminals. The screw terminals and the quick connect terminals are physically connected on the control board.
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
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 VI: REQUIRED CONTROL
SET-UP
IMPORTANT: The following steps must be taken at the time of installation to insure proper system operation.
1. Consult system wiring diagram to determine proper thermostat
wiring for your system.
2. If heat kit is installed, change HEAT ENABLE jumper from NO
HEAT to HEAT position.
3. If a humidstat is installed, change HUM STAT jumper from NO to
YES.
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
Jumper Positions
Heat Enable Jumper
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.
With the jumper in the NO HEAT position, the control will not energize
the heat relay outputs or sense the limit switch input.
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
present, the control will sense an open limit condition and the blower
will run continuously.
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 energize 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.
If the jumper is not present, the control will operate as if the jumper is in
the YES position.
Mode Jumper
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.
If the jumper is not present, the control will operate as if the jumper is in
the HP position.
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.
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.
TABLE 3:
Status
No power to control OFF
Normal operation 2s ON / 2s OFF
Control in test mode Rapid Flash
Control failure ON
Limit Faults
Limit switch currently open (not in lockout) 1
Multiple limit openings with no call for heat 2
Multiple limit openings during one call for heat 3
Single long duration limit opening 4
Multiple long duration limit openings 5
Fan failure 6
Wiring Related Faults
Simultaneous call for heating and cooling 7
Internal Control Faults
Control recovered from internal event 9
Fault Codes
Fault or Status Condition
LED1 (RED)
Flash Code
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262675-UIM-A-0806
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
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).
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 efficiency 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.
LOW FAN
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.
The LOW FAN output is energized when the control has the following
inputs.
TABLE 4:
Y/Y2 and HUM de-energized with
HUM STAT jumper in YES position
Low Fan Control Inputs
Input Operational Mode
G Continuous Fan operation
Y1 or Y1 and O First stage compressor operation
Dehumidification during cooling
Blower Delays
The control includes the following blower delays:
TABLE 5:
Condition Blower Delay
Following call for cooling 60 seconds
Following call for heat pump heating 30 seconds
Following call for electric heat heating 10 seconds
Blower Delays
Heat Output and Limit Connections
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.
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.
TABLE 6:
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.
Heat Relays
Input Heat Relay Output
W1 HT1
W2 HT1 and HT2
W1 and W2 HT1 and HT2 and HT3
Depending on the heat kit installed in the air handler, the control provides 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 elements (HT1, HT2, & HT3) when it receives a first and second stage
heat input from the thermostat.
Limit Switch and Lockout Operation
Limit Switch Operation
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 energized). When the limit switch closes, the control will re-energize electric
heat according to the thermostat inputs using normal timings.
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 homeowner that a problem has occurred and a service call is required.
Soft Lockout
If the limit switch opens for a second long duration period during a single 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.
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 control. The control de-energizes the blower five minutes after entering the
hard lockout condition.
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.
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.
If the limit switch opens multiple times soon after a soft lockout reset
(fault code 6), the control will enter a hard lockout condition.
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.
SECTION VII: LINE POWER
CONNECTIONS
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 appropriate 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.
Refer to Tables to determine proper wire sizing:
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.
Unitary Products Group 7
Page 8
262675-UIM-A-0806
TYPICAL WIRING WITHOUT ELECTRIC HEAT
GND. LUG
POWER
SUPPLY
1 PHASE ELECTRIC HEAT
WITH CIRCUIT BREAKER
& BREAKER BAR REMOVED
MULTI-SOURCE (15 - 25 KW) - 25 KW SHOWN
GND. LUG
POWER
SUPPLY 1
POWER
SUPPLY 2
POWER
SUPPLY 3
MAYBE1,2,OR3
CIRCUIT BREAKERS
GND.
LUG
GND.
LUG
FIGURE 6: Line Power Connections
3 PHASE ELECTRIC HEAT
WITH CIRCUIT BREAKER
MULTI-SOURCE - 25 KW
GND. LUG
POWER
SUPPLY 1
POWER
SUPPLY 2
(2) 3-PHASE
BREAKERS
CONNECT TRANSFORMER LEADS WITH WIRE NUTS
(TYPICAL ALL HEAT KITS)
ELECTRIC HEAT
WITHOUT CIRCUIT BREAKER
3 PHASE (10 - 15 KW)
GND. LUG
POWER
SUPPLY
ELECTRIC HEAT
WITHOUT CIRCUIT BREAKER
SINGLE SOURCE (2.5 - 10 KW)
GND. LUG
POWER
SUPPLY
CONNECT LEADS WITH WIRE NUTS
(TYPICAL ALL HEAT KITS)
GND.
LUG
POWER
SUPPLY
AS SHIPPED FROM FACTORY
GND.
LUG
TERMINAL
BLOCK
GND.
LUG
TERMINAL
BLOCK
(2.5 - 25 KW) - 25 KW SHOWN
GND. LUG
POWER
SUPPLY
(JUMPER BAR)
NOTE: USE ONLY COPPER CONDUCTORS
ELECTRIC HEAT
WITHOUT CIRCUIT BREAKER
3 PHASE (10 - 15 KW)
GND. LUG
1 PHASE ELECTRIC HEAT
WITH CIRCUIT BREAKER
SINGLE SOURCE
GND.
LUG
MAYBE1,2,OR3
CIRCUIT BREAKERS
POWER WIRING (208/230-1-60)
GND.
LUG
TERMINAL
BLOCK
FIGURE 7: 460V - Line Power Connections
SECTION VIII: BLOWER SPEED
CONNECTIONS
All air handlers contain 3-speed blower motors which are prewired to
the control board.
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.
Connect motor wires to motor speed tap receptacle for speed desired.
See wiring label for motor wiring details.
FACTORY WIRED TO
TRANSFORMER
YEL
FACTORY WIRED TO
FAN MOTOR RELAY
TERMINAL ON
CONTROL BOARD
230 VOLT
BLOWER MOTOR
CAP
HIGH
MED
LOW
FIGURE 8: Blower Speed Connections
ORG
TAPE END & CAP
460 VOLT
BLOWER
MOTOR
L2
HIGH
PUR
HIGH
MED
LOW
BRN
WITH WIRE NUT
L1
460 VOLT
BLOWER
MOTOR
ORG
HIGH
MED
LOW
PUR
L2
MEDIUM
BRN
L1
460 VOLT
BLOWER
MOTOR
460 VOLT BLOWER MOTOR
FIGURE 9: 460V - Blower Speed Connections
BRN
L2
PUR
PUR
GND.
HIGH
PUR
LOW
MED
LOW
ORG
L1
BRN
8 Unitary Products Group
Page 9
262675-UIM-A-0806
SECTION IX: UNIT DATA
TABLE 7:
Models: MA 08B21 12B21 12B41 14D21
Blower - Diameter x Width 10 x 9 10 x 9 10 x 9 10 x 10
Motor
Voltage 208 / 230 208 / 230 460 208 / 230
Amps Full Load 1.5 3.5 2.3 2.4
Filter
Filter Rack 1FR0617 1FR0617 1FR0617 1FR0624
Shipping / Operating Weight (lbs.) 128 / 122 132 / 126 132 / 126 162 / 156
Models: MA 16C21 16C41 20D21 20D41
Blower - Diameter x Width 10 x 10 10 x 10 11 x 10 11 x 10
Motor
Voltage 208 / 230 460 208 / 230 460
Amps Full Load 4.0 2.6 7.4 3.7
Filter
Filter Rack 1FR0621 1FR0621 1FR0624 1FR0624
Shipping / Operating Weight (lbs.) 139 / 133 139 / 133 162 / 156 162 / 156
1. Field Supplied.
Physical and Electrical Data
1
1
HP 1/4 HP 3/4 HP 3/4 HP 1/2 HP
Nominal RPM 1075 1075 1075 1075
Type DISPOSABLE OR PERMANENT
Size 16 x 20 x 1 16 x 20 x 1 16 x 20 x 1 22 x 20 x 1
Permanent Type Kit 1PF0601BK 1PF0601BK 1PF0601BK 1PF0603BK
HP 1 HP 1 HP 1 HP 1 HP
Nominal RPM 1075 1075 1075 1075
Type DISPOSABLE OR PERMANENT
Size 20 x 20 x 1 20 x 20 x 1 22 x 20 x 1 22 x 20 x 1
Permanent Type Kit 1PF0602BK 1PF0602BK 1PF0603BK 1PF0603BK
TABLE 8:
Electrical Data - Cooling Only (60 Hz) - 208/230
Total Motor Amps Minimum Circuit Ampacity
Models
MA
60 Hertz 60 Hertz
208V230V208V230V
08BN21 1.4 1.5 1.8 1.9 15 14
12BN21 2.1 3.5 2.6 3.0 15 14
14DN21 3.3 2.4 4.1 4.4 15 14
16CN21 3.6 4.0 4.5 5.0 15 14
20DN21 4.8 7.4 6.0 6.5 15 14
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
Models
MA
Total Motor Amps Minimum Circuit Ampacity
60 Hertz 60 Hertz
12BN41 2.3 3.5 15 14
16CN41 2.6 3.9 15 14
20DN41 3.7 5.6 15 14
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
FOR
208V
230V 240V .918
OPERATION MULTIPLY
240V
TABULATED KW & MBH BY
220V 240V .840
.751
Max. O.C.P.
Amps/Type
Max. O.C.P.
Amps/Type
1
Minimum Wire
Size A.W.G.
1
Minimum Wire
Size A.W.G.
Unitary Products Group 9
Page 10
262675-UIM-A-0806
TABLE 11:
Electrical Data - 1 Ø - 208/230-1-60
Models
MA
Heat Kit - Single
Phase
4HK*6500206 0.5 Lo 1.9 2.5 6.4 8.5 1.9 2.5 1.9 2.5 1.9 2.5
08BN21
4HK*6500506 0.5 Lo 3.6 4.8 12.3 16.4 3.6 4.8 3.6 4.8 3.6 4.8
4HK*6500806 0.5 Med 5.6 7.5 19.2 25.6 2.8 3.75 5.6 7.5 5.6 7.5
4HK*6501006 0.5 Hi 7.2 9.6 24.6 32.8 3.6 4.8 7.2 9.6 7.2 9.6
4HK*6500506 0.5 Lo 3.6 4.8 12.3 16.4 3.6 4.8 3.6 4.8 3.6 4.8
12BN21
4HK*6500806 0.5 Med 5.6 7.5 19.2 25.6 2.8 3.75 5.6 7.5 5.6 7.5
4HK*6501006 0.5 Med 7.2 9.6 24.6 32.8 3.6 4.8 7.2 9.6 7.2 9.6
4HK165N1506 0.5 Med 10.8 14.4 36.9 49.1 3.6 4.8 7.2 9.6 10.8 14.4
4HK*6500506 0.5 Lo 3.6 4.8 12.3 16.4 3.6 4.8 3.6 4.8 3.6 4.8
4HK*6500806 0.5 Lo 5.6 7.5 19.2 25.6 2.8 3.75 5.6 7.5 5.6 7.5
14DN21
4HK*6501006 0.5 Med 7.2 9.6 24.6 32.8 3.6 4.8 7.2 9.6 7.2 9.6
4HK16501506 0.5 Med 10.8 14.4 36.9 49.1 3.6 4.8 7.2 9.6 10.8 14.4
4HK16501806 0.5 Hi 13.2 17.6 45.1 60.1 3.3 4.4 6.6 8.8 13.2 17.6
4HK16502006 0.5 Hi 14.4 19.2 49.2 65.5 3.6 4.8 7.2 9.6 14.4 19.2
4HK*6500506 0.5 Lo 3.6 4.8 12.3 16.4 3.6 4.8 3.6 4.8 3.6 4.8
4HK*6500806 0.5 Lo 5.6 7.5 19.2 25.6 2.8 3.75 5.6 7.5 5.6 7.5
16CN21
4HK*6501006 0.5 Med 7.2 9.6 24.6 32.8 3.6 4.8 7.2 9.6 7.2 9.6
4HK16501506 0.5 Med 10.8 14.4 36.9 49.1 3.6 4.8 7.2 9.6 10.8 14.4
4HK16501806 0.5 Hi 13.2 17.6 45.1 60.1 3.3 4.4 6.6 8.8 13.2 17.6
4HK16502006 0.5 Hi 14.4 19.2 49.2 65.5 3.6 4.8 7.2 9.6 14.4 19.2
4HK*6500806 0.5 Lo 5.6 7.5 19.2 25.6 2.8 3.75 5.6 7.5 5.6 7.5
4HK*6501006 0.5 Lo 7.2 9.6 24.6 32.8 3.6 4.8 7.2 9.6 7.2 9.6
20DN21
4HK16501506 0.5 Med 10.8 14.4 36.9 49.1 3.6 4.8 7.2 9.6 10.8 14.4
4HK16501806 0.5 Med 13.2 17.6 45.1 60.1 3.3 4.4 6.6 8.8 13.2 17.6
4HK16502006 0.5 Med 14.4 19.2 49.2 65.5 3.6 4.8 7.2 9.6 14.4 19.2
4HK16502506 0.5 Med 18.0 24.0 61.5 81.9 3.6 4.8 10.8 14.4 18.0 24.0
1. See conversion Table 10.
* May be 0 (no breaker) or 1 (with breaker).
Max.
Static
Min.
Speed
Tap
Total Heat
1
KW Staging
KW MBH W1 Only W2 Only W1 + W2
208V 240V 208V 240V 208V 240V 208V 240V 208V 240V
TABLE 12:
Electrical Data - (For
Models
MA
Heater
Model
Multi-Source
Power Supply) - Copper Wire 1 Ø - 208/230-1-60
Min. Circuit Ampacity
Max. O.C.P.
1
Amps/Type
75°C Wire Size - AWG
Circuit Circuit Circuit
1st 2nd 3rd 1st 2nd 3rd 1st 2nd 3rd
208/240 208/240 208/240 208/240 208/240 208/240 208/240 208/240 208/240
12BN21 4HK165N1506 47.5 / 54.4 21.7 / 25.0 – 50 / 60 25 / 25 – 8 / 6 10 / 10 –
4HK16501506 46.0 / 53.0 21.7 / 25.0 – 50 / 60 25 / 25 – 8 / 6 10 / 10 –
14DN21
4HK16501806 42.3 / 48.8 39.7 / 45.8 – 45 / 50 40 / 50 – 8 / 8 8 / 8 –
4HK16502006 46.0 / 53.0 43.3 / 50.0 – 50 / 60 45 / 50 – 8 / 6 8 / 8 –
4HK16501506 47.8 / 55.0 21.7 / 25.0 – 50 / 60 25 / 25 – 8 / 6 10 / 10 –
16CN21
4HK16501806 44.2 / 50.8 39.7 / 45.8 – 50 / 60 40 / 50 – 8 / 6 8 / 8 –
4HK16502006 47.8 / 55.0 43.3 / 50.0 – 50 / 60 45 / 50 – 8 / 6 8 / 8 –
4HK16501506 49.3 / 56.5 21.7 / 25.0 – 50 / 60 25 / 25 – 8 / 6 10 / 10 –
20DN21
4HK16501806 45.7 / 52.3 39.7 / 45.8 – 50 / 60 40 / 50 – 8 / 6 8 / 8 –
4HK16502006 49.3 / 56.5 43.3 / 50.0 – 50 / 60 45 / 50 – 8 / 6 8 / 8 –
4HK16502506 49.3 / 56.5 43.3 / 50.0 21.7 / 25.0 50 / 60 45 / 50 25 / 25 8 / 6 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
Page 11
262675-UIM-A-0806
TABLE 13:
Electrical Data - (For
Models
MA
Single Source
Heat Kit - Single
Phase*
Power Supply) - Copper Wire 1 Ø - 208/230-1-60
Heater
Amps
240V
Min. Circuit Ampacity
208V 240V 208V 240V 208V 240V
4HK*6500206 10.4 13.03 14.88 15 15 14 14
08BN21
4HK*6500506 20.0 23.42 26.88 30 30 10 10
4HK*6500806 31.3 35.60 41.00 40 45 8 8
4HK*6501006 40.0 45.08 51.88 50 60 8 6
4HK*6500506 20.0 25.79 29.38 30 30 10 10
12BN21
4HK*6500806 31.3 37.98 43.50 40 45 8 8
4HK*6501006 40.0 47.46 54.38 50 60 8 6
4HK165N1506 60.0 69.13 79.38 70 90 4 3
4HK*6500506 20.0 24.29 28.00 30 30 8 10
4HK*6500806 31.3 36.48 42.13 40 45 8 8
14DN21
4HK*6501006 40.0 45.96 53.00 50 60 8 6
4HK16501506 60.0 67.63 78.00 70 90 4 3
4HK16501806 73.3 82.07 94.63 90 100 4 3
4HK16502006 80.0 89.29 103.00 100 110 3 2
4HK*6500506 20.0 26.17 30.00 30 30 8 8
4HK*6500806 31.3 38.35 44.13 40 45 8 8
16CN21
4HK*6501006 40.0 47.83 55.00 50 60 8 6
4HK16501506 60.0 69.50 80.00 70 90 4 3
4HK16501806 73.3 83.94 96.63 90 100 4 3
4HK16502006 80.0 91.17 105.00 100 110 3 2
4HK*6500806 31.3 42.60 48.38 45 50 8 8
4HK*6501006 40.0 52.08 59.25 60 60 8 6
20DN21
4HK16501506 60.0 73.75 84.25 90 90 3 3
4HK16501806 73.3 88.19 100.88 90 110 3 2
4HK16502006 80.0 95.42 109.25 100 125 3 2
4HK16502506 100.0 117.08 134.25 125 150 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).
Field Wiring
Max. O.C.P.
1
Amps/Type
75°C Wire Size - AWG
TABLE 14:
Electrical Data - 3 Ø - 208/230-3-60
Models
MA
08B 4HK06501025 0.5 Hi 7.2 9.6 24.6 32.8 7.2 9.6 7.2 9.6 7.2 9.6
12B 4HK06501025 0.5 Med 7.2 9.6 24.6 32.8 7.2 9.6 7.2 9.6 7.2 9.6
14D
16C
20D
1. See conversion Table 10.
Heat Kit -
Three Phase
Max.
Static
Min.
Speed
Tap
Total Heat
1
KW MBH W1 Only W2 Only W1 + W2
208V 240V 208V 240V 208V 240V 208V 240V 208V 240V
KW Staging
4HK06501025 0.5 Med 7.2 9.6 24.6 32.8 7.2 9.6 7.2 9.6 7.2 9.6
4HK06501525 0.5 Med 10.8 14.4 36.9 49.1 10.8 14.4 10.8 14.4 10.8 14.4
4HK06501825 0.5 Hi 12.9 17.2 44.7 58.7 12.9 17.2 12.9 17.2 12.9 17.2
4HK06501025 0.5 Med 7.2 9.6 24.6 32.8 7.2 9.6 7.2 9.6 7.2 9.6
4HK06501525 0.5 Med 10.8 14.4 36.9 49.1 10.8 14.4 10.8 14.4 10.8 14.4
4HK06501825 0.5 Hi 12.9 17.2 44.7 58.7 12.9 17.2 12.9 17.2 12.9 17.2
4HK06501025 0.5 Lo 7.2 9.6 24.6 32.8 7.2 9.6 7.2 9.6 7.2 9.6
4HK06501525 0.5 Med 10.8 14.4 36.9 49.1 10.8 14.4 10.8 14.4 10.8 14.4
4HK16502525 0.5 Med 18.0 24.0 61.4 81.4 9.0 12.0 18.0 24.0 18.0 24.0
Unitary Products Group 11
Page 12
262675-UIM-A-0806
TABLE 15:
Electrical Data - (For
Models
MA
Heater
Model
Multi-Source
1st 2nd 3rd 1st 2nd 3rd 1st 2nd 3rd
Power Supply) - Copper Wire 3 Ø - 208/230-3-60
Min. Circuit Ampacity
Max. O.C.P.
Circuit Circuit Circuit
1
Amps/Type
75°C Wire Size - AWG
208/240 208/240 208/240 208/240 208/240 208/240 208/240 208/240 208/240
20D 4HK16502525 40.0 / 45.4 31.3 / 36.1 - / - 40 / 50 35 / 40 - / - 8 / 8 8 / 8 - / -
1. O.C.P. = Over Current Protection device, must be HACR type Circuit Breaker or Time Delay fuse.
TABLE 16:
Electrical Data - (For
Models
MA
Single Source
Heat Kit -
Three Phase
Power Supply) - Copper Wire 3 Ø - 208/230-3-60
Heater
Amps
240V
Min. Circuit Ampacity
Max. O.C.P.
208V 240V 208V 240V 208V 240V
Field Wiring
1
Amps/Type
75°C Wire Size - AWG
08B 4HK06501025 23.1 26.8 30.8 30 35 10 8
12B 4HK06501025 23.1 27.6 31.9 30 35 10 8
4HK06501025 23.1 29.1 33.3 30 35 10 8
14D
4HK06501525 34.7 41.6 46.4 45 50 8 8
4HK06501825 41.4 48.9 56.1 50 60 8 6
4HK06501025 23.1 29.5 33.9 30 35 10 8
16C
4HK06501525 34.7 42.0 48.4 45 50 8 8
4HK06501825 41.4 49.3 56.8 50 60 6 6
20D
1. O.C.P. = Over Current Protection device, must be HACR type Circuit Breaker or Time Delay fuse.
2. Heaters are 3 Phase.
4HK06501025 23.1 33.8 38.1 35 40 8 8
4HK06501525 34.7 43.5 52.6 45 60 8 6
TABLE 17:
Electrical Data - 460-3-60
MA
Models
Heater
Models
MAX. STATIC & MIN. CFM
Total Heat1 KW Staging
KW MBH W1 Only W2 Only W1 + W2
Static Taps 480V 480V 480V 480V 480V
12BN41 4HK06501046 0.5” Med 9.6 3.28 9.6 9.6 9.6
16CN41
4HK06501046 0.5” Med 9.6 3.28 9.6 9.6 9.6
4HK06501546 0.5” Med 14.4 4.92 14.4 14.4 14.4
4HK06501046 0.5” Med 9.6 3.28 9.6 9.6 9.6
20DN41
4HK06501546 0.5” Med 14.4 4.92 14.4 14.4 14.4
4HK06502946 0.5” Med 28.8 9.84 14.4 28.8 28.8
TABLE 18:
Electrical Data - (For
Single Source
Power Supply) - Copper Wire 3 Ø - 460-3-60
Field Wiring
MA
Models
Heater
Models
Min. Circuit Ampacity Max. O.C.P.
1
Amps/Type
Wire Size - AWG
75°C
480V 480V 480V
12BN41 4HK06501046 17.4 20 12
16CN41
4HK06501046 17.8 25 10
4HK06501546 24.9 25 10
4HK06501046 19.1 25 10
20DN41
4HK06501546 26.3 30 8
4HK06502946 48.0 50 8
1. OCP = Over Current Protection device, must be HACR type Circuit Breaker or Time Delay fuse.
12 Unitary Products Group
Page 13
262675-UIM-A-0806
TABLE 19:
Air Flow Data - 60 Hz Models (230 & 460 Volt)
230 / 460 Volt - 60 Hz
Models
MA
08B
12B
16C
14D
20D
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.
ModelsMCBlower Motor
Speed
High 1102 986 870 754 638
MC18B**H
Med. 831 737 644 551 457
Low 615 537 458 379 300
High 1112 1001 890 780 669
MC24B**H
Med. 851 759 667 576 484
Low 643 562 480 399 317
High 1511 1355 1199 1043 887
MC30B**H
Med. 1241 1107 973 839 705
Low 1100 980 861 741 622
High 1464 1286 1108 929 751
MC36B**H
Med. 1195 1050 905 761 616
Low 1073 944 815 687 558
High 1959 1874 1802 1708 1606
MC42C**H
Med. 1631 1587 1542 1473 1395
Low 1447 1431 1401 1363 1304
High 2018 1895 1772 1649 1525
MC48C**H
Med. 1684 1595 1506 1417 1328
Low 1561 1476 1392 1308 1223
High 1715 1671 1608 1547 1460
MC48D**H
Med. 1471 1438 1367 1318 1263
Low 1379 1330 1276 1227 1157
High 1763 1713 1649 1581 1511
MC60D**H
Med. 1487 1462 1412 1356 1280
Low 1381 1353 1292 1225 1186
High 1746 1699 1655 1579 1486
MC61D**H
Med. 1486 1442 1393 1333 1270
Low 1392 1336 1285 1226 1158
High 2226 2190 2103 2035 1931
MC48D**H
Med. 2115 2087 2017 1951 1851
Low N/A N/A N/A 1716 1643
High 2326 2235 2192 2107 2027
MC60D**H
Med. 2150 2089 2036 2008 1944
Low 1737 1752 1745 1718 1676
High 2357 2321 2254 2191 2139
MC61D**H
Med. 2212 2144 2111 2069 1986
Low 1765 1783 1803 1779 1723
1
CFM
@ External Static Pressure - IWC
0.1 0.2 0.3 0.4 0.5
0.6 0.7 0.8 0.9 1
521 405 289 173 57
364 271 178 84 N/A
221 142 63 N/A N/A
558 447 336 225 114
392 300 208 116 25
236 154 73 N/A N/A
731 576 420 264 108
572 438 304 170 36
502 383 263 144 24
573 394 216 38 N/A
471 326 181 37 N/A
429 300 172 43 N/A
1486 1408 1264 953 810
1315 1218 967 821 533
1241 1098 844 751 712
1402 1279 1156 1033 910
1240 1151 1062 973 884
1139 1055 970 896 801
1338 1232 1003 727 508
1180 920 824 587 503
1047 866 681 567 392
1407 1276 995 852 N/A
1210 1087 795 726 N/A
1057 863 780 669 N/A
1399 1264 1093 796 581
1189 1081 776 628 450
1061 882 740 680 445
1845 1683 1541 1465 1328
1744 1542 1466 1406 1254
1554 1451 1379 1292 1151
1906 1786 1538 1469 1368
1852 1692 1499 1416 1295
1600 1447 1389 1311 1200
1951 1859 1656 1556 1472
1862 1727 1566 1498 1369
1646 1514 1442 1381 1245
Unitary Products Group 13
Page 14
262675-UIM-A-0806
TABLE 20:
Air Flow Data - 60 Hz Models (208 Volt)
208 Volt - 60 Hz
Models
MA
08B
12B
16C
14D
20D
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.
ModelsMCBlower Motor
Speed
High 1080 964 848 732 615
MC18B**H
Med. 712 628 544 461 377
Low 529 452 376 299 223
High 1039 932 825 717 610
MC24B**H
Med. 743 659 575 491 407
Low 532 460 387 315 242
High 1444 1271 1099 927 755
MC30B**H
Med. 1101 967 833 699 565
Low 937 824 711 598 485
High 1434 1267 1099 932 764
MC36B**H
Med. 1083 955 827 699 571
Low 933 818 703 588 473
High 1782 1712 1619 1524 1435
MC42C**H
Med. 1468 1415 1355 1298 1233
Low 1310 1278 1239 1185 1125
High 1983 1865 1747 1629 1511
MC48C**H
Med. 1529 1446 1363 1280 1197
Low 1312 1249 1185 1122 1059
High 1549 1498 1448 1383 1325
MC48D**H
Med. 1275 1269 1225 1181 1115
Low 1190 1162 1112 1074 975
High 1545 1490 1463 1378 1337
MC60D**H
Med. 1266 1248 1207 1140 1101
Low 1192 1186 1126 1067 992
High 1564 1520 1455 1400 1336
MC61D**H
Med. 1303 1262 1225 1165 1117
Low 1204 1161 1104 1060 1001
High 2250 2180 2139 2062 1971
MC48D**H
Med. 1953 1956 1905 1858 1755
Low N/A N/A 1544 1538 1455
High 2251 2186 2144 2073 2003
MC60D**H
Med. 1987 1945 1926 1887 1836
Low 1492 1517 1521 1523 1507
High 2208 2123 2092 2054 1910
MC61D**H
Med. 1959 1945 1913 1862 1766
Low N/A N/A N/A 1546 1491
1
CFM
@ External Static Pressure - IWC
0.1 0.2 0.3 0.4 0.5
0.6 0.7 0.8 0.9 1
499 383 267 150 34
293 210 126 42 N/A
146 70 N/A N/A N/A
502 395 288 180 73
323 239 156 72 N/A
169 97 24 N/A N/A
582 410 238 65 N/A
431 297 163 29 N/A
372 260 147 34 N/A
597 430 262 95 N/A
443 315 187 59 N/A
359 244 129 14 N/A
1323 1213 985 798 557
1144 1005 791 669 493
1045 934 725 561 424
1393 1275 1157 1039 921
1114 1031 948 865 782
995 932 868 805 742
1235 1125 936 658 548
997 811 684 548 392
817 737 625 493 358
1231 1115 850 739 572
1005 839 687 564 469
842 740 638 507 347
1257 1154 813 755 549
1028 827 744 590 398
870 745 554 532 462
1855 1683 1553 1461 1342
1649 1528 1440 1355 1245
1401 1346 1285 1195 1081
1921 1809 1574 1478 1370
1761 1643 1472 1387 1213
1436 1379 1308 1213 1128
1762 1595 1496 1435 1298
1661 1513 1420 1315 1182
1407 1354 1258 1184 1088
14 Unitary Products Group
Page 15
262675-UIM-A-0806
MA SERIES - Air Handler Control Wiring
Typical A/C - Cooling only Applications
THERMOSTAT
RR
G
Y
W1
W2
C
AIR HANDLER
BOARD
G
Y/Y2
Y1
W2
W1
O
HUM
X/L
COM
1-STAGE
AIR CONDITIONING
Y
HUMIDISTAT
C
THERMOSTAT
*
MA SERIES - Air Handler Control Wiring
Typical A/C with Electric Heat Applications
AIR HANDLER
BOARD
RR
G
Y
W2
W1
C
G
Y/Y2
Y1
W2
W1
O
HUM
X/L
COM
AIR CONDITIONING
1-STAGE
Y
HUMIDISTAT
C
FIGURE 10: Cooling Models with Electric Heat Wiring
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. Optional humidity switch - contacts open on humidity rise.
3. Remove HUM STAT Jumper on AH Control Board
4. MODE Jumper on AH control board should be set to A/C for air conditioners and HP for heat pumps.
5. To change quantity of heat during HP defrost cycle - Reverse connections at W1 & W2 on Air Handler Control Board
CONTROL WIRING - MA Series - Air Handler & New UPG HP Systems
Two Stage H/P with York Guard VI Board & Copeland “Ultra Tech”
THERMOSTAT
RR R
GG
Y2
Y1
E
W
O O
X/L X/L X/L
C
Conventional Application - Not Hot Heat Pump
AIR HANDLER
BOARD
Y/Y2
Y1
W2
W1
O
HUM
HUMIDISTAT
COM
2 - STAGE SCROLL
HEAT PUMP
Y2
Y2 OUT
Y1
W2 OUT
W1 OUT
W
*
BS
C
*
FIGURE 11: Two-Stage Cooling Wiring
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. Optional humidity switch - contacts open on humidity rise.
3. Remove HUM STAT Jumper on AH Control Board
4. MODE Jumper on AH control board should be set to A/C for air conditioners and HP for heat pumps.
5. To change quantity of heat during HP defrost cycle - Reverse connections at W1 & W2 on Air Handler Control Board
SECTION X: MAINTENANCE
Filters must be cleaned or replaced when they become dirty. Inspect at
LUBRICATION
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
Page 16
NOTES
Subject to change without notice. Printed in U.S.A. 262675-UIM-A-0806
Copyright © by York International Corp. 2006. All rights reserved. Supersedes: 170341-UIM-C-0806
Unitary 5005 Norman
Product York OK
Group Drive 73069
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