Thermo Pride Air Handler MA User Manual
MODULAR
INSTALLATION MANUAL
MAC-225
ECN 5287-MA 121005
NON-VARIABLE SPEED AIR HANDLERS
MODELS: MA
LIST OF SECTIONS
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
UNIT INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
ELECTRIC HEATER INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . 5
LOW VOLTAGE CONTROL CONNECTIONS . . . . . . . . . . . . . . . . . . 6
REQUIRED CONTROL
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
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) -
Copper Wire 1 Ø - 208/230-1-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
ISO 9001
Certified Quality
Management System
SET-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
LINE POWER CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
BLOWER SPEED CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . 8
UNIT DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
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
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
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,
WAR NIN G, or CAUTION.
DANGER indicates an imminently hazardous situation, which, if not
avoided, will result in death or serious injury
WAR NIN G 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.
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.
It is also used to
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.
NOTICE
In severe high humidity, high temperature indoor unit environments,
seal completely with adequate fiberglass insulation using vapor barrier on the outside.
2
FIGURE 1: Typical Installation with MC Multi-Position Coils
UPFLOW
DOWNFLOW
HORIZONTAL RIGHT
HORIZONTAL LEFT
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
FIGURE 2: Coil and Air Handler Attachment Details
AIR HANDLER AND COIL UPFLOW AND
HORIZONTAL
1. Apply neoprene gasket to top of coil casing.
2. Position blower casing over coil opening.
3. Attach tie plate to casings of air handler and coil using screws.
4. Remove blower access panel and coil filter door.
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.
8. Secure base of air handler to top of coil using screws.
9. Locate 2” wide foam gasket.
10. On the interior of the air handler/coil attachment point, apply foam
gasket over duct flanges on the sides and back.
11. Reinstall blower motor and housing by reversing the process in
Steps 3 and 4.
12. Complete electrical and blower speed connections as outlined in
other sections of this document.
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.
4. Attach tie plate to casings of air handler and coil using screws.
5. Remove blower access panel and coil filter door.
6. Disconnect wiring to blower motor.
*Note location of wires as these will be reconnected in a later step.
7. Remove blower motor and housing.
8. Fasten duct flanges of coil to base of air handler with screws. See
Figure 1.
9. Secure base of air handler to base of coil using screws.
10. Locate 2” wide foam gasket.
11. On the interior of the air handler/coil attachment point, apply foam
gasket over duct flanges on the sides and back.
12. Reinstall blower motor and housing by reversing the process in
Steps 3 and 4.
13. Complete electrical and blower speed connections as outlined in
other sections of this document.
14. Reposition and replace blower access panel.
3
FIGURE 3: Gasket Location
J
K
B
A
22”
FIGURE 4: Dimensions & Duct Connection Dimensions
TABLE 1:
Dimensions
Dimensions
MA
MODELS
ABDE JK
Height Width Power Control
08B
17-1/2 16-1/2 14-19/32
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).
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.
10-3/8”
CIRCUIT BREAKER
20-1/2”
PANEL
E
D
Wiring Knockouts
TOP OUTLET
DIMENSIONS
BOTTOM INLET
DIMENSIONS
1
7/8” (1/2”)
1 3/8” (1”)
7/8” (1/2”)
1 23/32” (1 1/4”)
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.
4
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.
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
3-1/2 - 5 Ton 24” 53” - 58” 22”
FIGURE 5: Typical Horizontal Installation
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 HEAT
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.
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”
FIGURE 5: Typical Horizontal Installation
HEAT ENABLE
YY
JUMPER
1-1/2
MODE JUMPER
HUM OUT
RELAY OUTPUT
LOW FAN
RELAY OUTPUT
EAC RELAY
OUTPUT
HUM STAT JUMPER
FUSE
SPARE
JUMPER
FIGURE 6: Control Board
5
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.
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.
NOTICE
All wiring must comply with local and national electrical code requirements. Read and heed all unit caution labels.
NOTICE
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:
Terminal Signal Comment
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
Low Voltage Connections
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.
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.
6
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
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.
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.
Heat Relays
Input Heat Relay Output
W1 HT1
W2 HT1 and HT2
W1 and W2 HT1 and HT2 and HT3
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.
7
SECTION VII: LINE POWER
ELECTRIC HEAT
WITHOUT CIRCUIT BREAKER
SINGLE SOURCE (2.5 - 10 KW)
GND. LUG
POWER
SUPPLY
GND.
LUG
ELECTRIC HEAT
WITHOUT CIRCUIT BREAKER
3 PHASE (10 - 15 KW)
GND. LUG
POWER
SUPPLY
GND.
LUG
1 PHASE ELECTRIC HEAT
WITH CIRCUIT BREAKER
AS SHIPPED FROM FACTORY
SINGLE SOURCE
(2.5 - 25 KW) - 25 KW SHOWN
GND. LUG
POWER
SUPPLY
GND.
LUG
1 PHASE ELECTRIC HEAT
WITH CIRCUIT BREAKER
& BREAKER BAR REMOVED
MULTI-SOURCE (15 - 25 KW) - 25 KW SHOWN
GND. LUG
POWER
SUPPLY 1
GND.
LUG
POWER
SUPPLY 2
POWER
SUPPLY 3
TYPICAL WIRING WITHOUT ELECTRIC HEAT
GND. LUG
POWER
SUPPLY
GND.
LUG
POWER WIRING (208/230-1-60)
NOTE: USE ONLY COPPER CONDUCTORS
TERMINAL
BLOCK
TERMINAL
BLOCK
MAYBE1,2,OR3
CIRCUIT BREAKERS
MAYBE1,2,OR3
CIRCUIT BREAKERS
(JUMPER BAR)
CONNECT LEADS WITH WIRE NUTS
(TYPICAL ALL HEAT KITS)
ELECTRIC HEAT
WITHOUT CIRCUIT BREAKER
3 PHASE (10 - 15 KW)
GND. LUG
POWER
SUPPLY
GND.
LUG
3 PHASE ELECTRIC HEAT
WITH CIRCUIT BREAKER
MULTI-SOURCE - 25 KW
GND. LUG
POWER
SUPPLY 1
GND.
LUG
POWER
SUPPLY 2
TERMINAL
BLOCK
CONNECT TRANSFORMER LEADS WITH WIRE NUTS
(TYPICAL ALL HEAT KITS)
(2) 3-PHASE
BREAKERS
FACTORY WIRED TO
TRANSFORMER
FACTORY WIRED TO
FAN MOTOR RELAY
TERMINAL ON
CONTROL BOARD
YEL
PUR
PUR
HIGH
MED
LOW
GND.
230 VOLT
BLOWER MOTOR
CAP
BRN
ORG
TAPE END & CAP
WITH WIRE NUT
L1
460 VOLT
BLOWER
MOTOR
L2
HIGH
HIGH
MED
LOW
PUR
BRN
460 VOLT BLOWER MOTOR
ORG
L1
460 VOLT
BLOWER
MOTOR
L2
MEDIUM
HIGH
MED
LOW
PUR
BRN
ORG
460 VOLT
BLOWER
MOTOR
L2
LOW
HIGH
MED
LOW
PUR
BRN
L1
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.
FIGURE 7: Line Power Connections
FIGURE 8: 460V - Line Power Connections
SECTION VIII: BLOWER SPEED
CONNECTIONS
All air handlers contain 3-speed blower motors which are prewired to
the control board.
FIGURE 9: Blower Speed Connections FIGURE 10: 460V - Blower Speed Connections
8 Unitary Products Group
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.
SECTION IX: UNIT DATA
TABLE 7:
Models: MA MA08BN21 MA12BN21 MA12BN41 MA14DN21
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
Permanent Filter
Shipping / Operating Weight (lbs.) 75/71 82/78 82/78 94/88
Models: MA MA16CN21 MA16CN41 MA20DN21 MA20DN41
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
Permanent Filter
Shipping / Operating Weight (lbs.) 90/84 90/84 97/91 97/91
1. Field Supplied.
TABLE 8:
1. OCP = Over Current Protection device, must be HACR type Circuit Breaker or Time Delay fuse.
Physical and Electrical Data
HP 1/4 HP 3/4 HP 3/4 HP 1/2 HP
Nominal RPM 1075 1075 1075 1075
Type DISPOSABLE OR PERMANENT
1
Size 16 x 20 x 1 16 x 20 x 1 16 x 20 x 1 24 x 20 x 1
Filter Bulk Pack 1PF0601BK 1PF0601BK 1PF0601BK 1PF0604BK
HP 1 HP 1 HP 1 HP 1 HP
Nominal RPM 1075 1075 1075 1075
Type DISPOSABLE OR PERMANENT
1
Size 20 x 20 x 1 20 x 20 x 1 24 x 20 x 1 24 x 20 x 1
Filter Bulk Pack 1PF0602BK 1PF0602BK 1PF0604BK 1PF0604BK
Electrical Data - Cooling Only (60 Hz) - 208/230
Models
MA
Total Motor Amps Minimum Circuit Ampacity
60 Hertz 60 Hertz
208V230V208V230V
Max. O.C.P.
Amps/Type
1
Minimum Wire
Size A.W.G.
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
TABLE 9:
Electrical Data - Cooling Only (60 Hz) - 460
Models
MA
Total Motor Amps Minimum Circuit Ampacity
60 Hertz 60 Hertz
Max. O.C.P.
Amps/Type
1
Minimum Wire
Size A.W.G.
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
.751
TABULATED KW & MBH BY
220V 240V .840
9
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
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
08BN21
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
4HK16501306 0.5 Hi 9.8 13.0 33.3 44.4 3.3 4.3 6.5 8.6 9.8 13.0
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
12BN21
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
4HK16501306 0.5 Med 9.8 13.0 33.3 44.4 3.3 4.3 6.5 8.6 9.8 13.0
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
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
16CN21
4HK16501306 0.50 Med 9.8 13 33.3 44.4 3.3 4.3 6.5 8.7 9.8 13.0
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
4HK16501306 0.50 Med 9.8 13 33.3 44.4 3.3 4.3 6.5 8.7 9.8 13.0
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
Multi-Source
Power Supply) - Copper Wire 1 Ø - 208/230-1-60
Min. Circuit Ampacity
Models
MA
Heater
Model
1st 2nd 3rd 1st 2nd 3rd 1st 2nd 3rd
Circuit Circuit Circuit
208/240 208/240 208/240 208/240 208/240 208/240 208/240 208/240 208/240
12BN21
4HK16501306 41.8/49.5 19.5/22.5 – 45/50 20 / 25 – 8/8 10/10 –
4HK165N1506 47.5/54.4 21.7/25.0 – 50/60 25 / 25 – 8/6 10/10 –
4HK16501506 47.8/55.0 21.7/25.0 – 50/60 25 / 25 – 8/6 10/10 –
14DN21
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 –
4HK16501306 42.2/48.9 22.9/26.0 – 50/50 30/30 – 6/6 12/10 –
16CN21
4HK16501506 47.8/55.0 21.7/25.0 – 50/60 25 / 25 – 8/6 10/10 –
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 –
4HK16501306 43.5/49.9 24.2/27.0 – 50/50 30/30 – 6/6 10/10 –
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
Max. O.C.P.
1
Amps/Type
75°C Wire Size - AWG
Loading...