Page 1
MODULAR
INSTALLATION MANUAL
ISO 9001
Certified Quality
Management System
STANDARD ECM AIR HANDLERS
MODELS: MX
LIST OF SECTIONS
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
UNIT INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
ELECTRIC HEATER INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . .5
LOW VOLTAGE CONTROL CONNECTIONS . . . . . . . . . . . . . . . . . .6
REQUIRED CONTROL SET-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
LIST OF FIGURES
Typical Installation with MC or FC Evaporator Coil . . . . . . . . . . . . . . .3
Coil and Air Handler Attachment Details . . . . . . . . . . . . . . . . . . . . . . .3
Gasket Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Dimensions & Duct Connection Dimensions . . . . . . . . . . . . . . . . . . . .4
Duck Work Transition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Typical Horizontal Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
LIST OF TABLES
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Low Voltage Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Low Fan Control Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Fault Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Blower Delays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Heat Relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Physical and Electrical Data - Cooling Only (60 Hz) . . . . . . . . . . . . . . 9
Electrical Data - Cooling Only (60 Hz) . . . . . . . . . . . . . . . . . . . . . . . . . 9
Conversion Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Electrical Data - 1 Ø - 208/230-1-60 . . . . . . . . . . . . . . . . . . . . . . . . . . 9
LINE POWER CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
BLOWER SPEED CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . 8
UNIT DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Line Power Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Blower Speed Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Cooling Models with Electric Heat Wiring . . . . . . . . . . . . . . . . . . . . . 13
Single-Stage Heat Pump Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Two-Stage Heat Pump Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Wiring Diagram - MX12-16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Wiring Diagram - MX20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Electrical Data - (For Single Source Power Supply) -
Copper Wire 1 Ø - 208/230-1-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Electrical Data - (For Multi-Source Power Supply) -
Copper Wire 1 Ø - 208/230-1-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Electrical Data - 208/230-3-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Electrical Data - (For Single Source Power Supply) -
Copper Wire - 208/230-3-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Electrical Data - (For Multi-Source Power Supply) -
Copper Wire - 208/230-3-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Air Flow Data - 60 Hz Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
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.
.
.
It is also used to
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, personal injury or loss of life.
819682-UIM-A-0212
Page 2
819682-UIM-A-0212
NOTICE
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:
Air Handler Voltage Voltage code
208/230-1-60 21 187-253
1.Rated in accordance with ARI Standard 110, ut ilization 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
1
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.
In severe high humidity, high temperature indoor unit environments,
seal completely with adequate fiberglass insulation using vapor barrier on the outside.
2 Johnson Controls Unitary Products
Page 3
FIGURE 1: Typical Installation with MC or FC Evaporator Coil (MC required for horizontal applications)
UPFLOW
DOWNFLOW
HORIZONTAL RIGHT
HORIZONTAL LEFT
TIE PLATE
COIL
AIR HANDLER
COIL
TOP PLATE
AIR HANDLER
DOWNFLOW
APPLICATION
UPFLOW & HORIZONTAL
APPLICATIONS
819682-UIM-A-0212
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.
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.
Johnson Controls Unitary Products 3
Page 4
819682-UIM-A-0212
J
10-3/8”
E
CIRCUIT BREAKER
PANEL
BOTTOM INLET
DIMENSIONS
B
A
K
TOP OUTLET
DIMENSIONS
D
21-1/2”
20-1/2”
FIGURE 3: Gasket Location
FIGURE 4: Dimensions & Duct Connection Dimensions
TABLE 1:
Dimensions
Dimensions
Models
ABDEJK
Height Width Power Control
12B
12D 24-1/2 23-1/2 21-19/32
16C 21 20 18-3/32
25
17-1/2 16-1/2 14-19/32
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.
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.
Wiring Knockouts
1
7/8” (1/2”)
1 3/8” (1”)
7/8” (1/2”)
1 23/32” (1 1/4”)
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 non-conditioned space
such as, attic or crawlspace. 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.
4 Johnson Controls Unitary Products
Page 5
819682-UIM-A-0212
SUGGESTED LOCATION
OF BLOCK OFF PLATE
RECOMMENDED
TRANSITION
NOTICE
WW
XX
SUSPENSION SUPPORT LOCATIONS FOR HORIZONTAL APPLICATIONS
2
1-1/2
MIN. 1-1/2” x 1-1/2” Angle
Recommended length
26” minimum
with 2” clearance on
both sides of Air Handler
MIN. 3/8”
THREADED ROD
YY
HEAT ENABLE
JUMPER
HUM OUT
RELAY OUTPUT
EAC RELAY
OUTPUT
LOW FAN
RELAY OUTPUT
SPARE
JUMPER
HUM STAT JUMPER
MODE JUMPER
FUSE
DUCT WORK TRANSITION
Duct work that is not designed to match the supply air opening can
cause turbulence inside the plenum box. This turbulence can change
the air flow patterns across the heat kit limit switch. If the factory suggested transition can not be fabricated, it is recommended a block off
plate (approximately 8” in height and running the full width of the plenum) be attached to the supply opening Please refer to Figure 9 as a
visual aid. The use of this block off plate will keep better air circulation
across the limit switch.
FIGURE 5: Duck Work Transition
This will not alleviate problems caused by improper installation. When
receiving intermittent fault codes pertaining to the limit switch always
double check your airflow CFM, motor speed and static pressures.
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 5.
Units
(Nominal Tons)
WW XX YY
Dimension
1-1/2 - 3 Ton 16” 48” 22”
3-1/2 - 5 Ton 24” 53” - 58” 22”
FIGURE 6: 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 10) 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 10 through 19 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.
FIGURE 7: Control Board
Johnson Controls Unitary Products 5
Page 6
819682-UIM-A-0212
NOTICE
NOTICE
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, 13, & 14.
TABLE 2:
Terminal Signal Comment
R 24 VAC power (fused). N/A
G Continuous Fan operation. N/A
Y/Y2 Second or full stage compressor operation. N/A
Y1 First stage compressor operation. Not used with outdoor units having one stage compressors.
W2 Second stage heat operation. N/A
W1 First stage heat operation. N/A
O Reversing valve operation.
HUM Humidity switch input.
X/L Connection point for heat pump fault indicator. This terminal is a connection point only and does not affect air handler control operation.
COM 24 VAC common. N/A
Low Voltage C onnections
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.
All wiring must comply with local and national electrical code requirements. Read and heed all unit caution labels.
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.
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 Figure 10.
SECTION VI: REQUIRED CONTROL
SET-UP
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 PER 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.
6 Johnson Controls Unitary Products
Page 7
819682-UIM-A-0212
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 is used as motor input because of the high efficiency
non-variable speed motor that comes with these MX models. 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.
LOW FAN
The LOW FAN output is used to switch the speed input to the motor to a
lower speed tap during cooling and heat pump modes (Y1/Y2).
The LOW FAN is de-energized during any call for electric heat
(W1,W2). Hence, once W1 or W2 is energized, the system runs on high
speed.
The LOW FAN output is energized when the control has the following
inputs.
TABLE 3:
Low Fan Control Inputs
Input Operational Mode
G Continuous Fan operation
Y1 or Y1 and O First stage compressor operation
Y/Y2 and HUM de-energized with HUM
STAT jumper in YES position
Dehumidification during cooling
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 4:
Fault Codes
Fault or Status Condition LED1 (RED) Flash Code
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
BLOWER DELAYS
The control includes the following blower delays:
TABLE 5:
Blower Delays
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
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:
Heat Relays
Input Heat Relay Output
W1 HT1
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.
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 and HT2).
With either configuration, the control will energize three heating elements (HT1, HT2, and 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 operation.
Johnson Controls Unitary Products 7
Page 8
819682-UIM-A-0212
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)
TERMINAL
BLOCK
TERMINAL
BLOCK
MAY BE 1, 2, OR 3
CIRCUIT BREAKERS
MAY BE 1, 2, OR 3
CIRCUIT BREAKERS
(JUMPER BAR)
CONNECT TRANSFORMER LEADS WITH
WIRE NUTS (TYPICAL ALL HEAT KITS)
LOW FAN SPEED, CONNECTED
TO LOW FAN TERMINALS ON
CONTROL BOARD, SEE WIRING DIAGRAM
FOR LOW FAN SPEED BEHAVIOR, SEE “LOW FAN”
UNDER “REQUIRED CONTROL SET-UP” SECTION
TO CONTROL BOARD
24V LOW FAN
TO CONTROL BOARD
24V EAC
TO TRANSFORMER
230V
BLOWER
GRN
C
G
L
N
GRN
BLK
WHT
YEL
PUR
RED*
1
2
3
4
5
208/230V
FAN MOTOR
*
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. Refer to Tables 11, 12, 14 and 15 to determine
proper wire sizing. Also see Figure 3. To minimize air leakage, seal the
wiring entry point at the outside of the unit.
All electrical connections to air handlers must be made with copper conductors. Direct connection of aluminum wiring to air handlers is
not approved.
If aluminum conductors are present, all applicable local and national
codes must be followed when converting from aluminum to copper conductors prior to connection to the air handler.
If wire other than uncoated (non-plated), 75° C ambient, copper wire is
used, consult applicable tables of the National Electic Code (ANSI/
NFPA 70). The chosen condutor and connections all must meet or
exceed the amperage rating of the overcurrent protector (circuit breaker
or fuse) in the circuit.
Additionally, existing aluminum wire within the structure must be sized
correctly for the application according to National Electric Code and
local codes. Caution must be used when sizing aluminum rather than
copper conductors, as aluminum conductors are rated for less current
than copper conductors of the same size.
FIGURE 8: Line Power Connections
SECTION VIII: BLOWER SPEED
CONNECTIONS
All air handlers contain a programmed 5 speed high efficiency brushless DC motor.
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 12. Airflow data is shown in Tables 16 and 17.
Connect motor wires to motor speed tap receptacle for speed desired.
See unit wiring label for motor wiring details.
FIGURE 9: Blower Speed Connections
8 Johnson Controls Unitary Products
Page 9
819682-UIM-A-0212
SECTION IX: UNIT DATA
TABLE 7:
Models MX12BN21 MX12DN21 MX16CN21 MX20DN21
Blower - Diameter x Width 10 x 9 10 x 10 10 x 10 10 x 10
Motor
Voltage 230
Amps Full Load (230) 2.8 2.8 4.1 6.0
Permanent Filter
Shipping / Operating Weight (lbs.) 70 / 66 83 / 77 83 / 77 89 / 83
TABLE 8:
TABLE 9:
Physical and Electrical Data - Cooling Only (60 Hz)
HP 1/31/31/23/4
Nominal RPM 1050 1050 1050 1050
Type DISPOSABLE OR PERMANENT
1
Size 16 x 20 x1 24 x 20 x 1 20 x 20 x 1 24 x 20 x1
Filter Bulk Pack 1PF0601BK 1PF0604BK 1PF0602BK 1PF0604BK
1. Field Supplied.
Electrical Data - Cooling Only (60 Hz)
Models
Total Motor Amps Minimum Circuit Ampacity
60 Hertz 60 Hertz
208V 230V 208V 230V
Max. O.C.P.
Amps/Type
1
12B 2.8 2.8 3.5 3.5 15 14
12D 2.8 2.8 3.5 3.5 15 14
16C 4.1 4.1 5.2 5.2 15 14
20D 6.0 6.0 7.5 7.5 15 14
1.OCP = Over Current Protection device, must be HACR type Circuit Breaker or Time Delay fuse.
Conversion Table
kW & MBH Conversions - for Total Power Input Requirement
FOR
208V
230V 240V .918
OPERATION MULTIPLY
240V
TABULATED kW & MBH BY
.751
Minimum Wire
Size A.W.G.
TABLE 10:
Electrical Data - 1 Ø - 208/230-1-60
Models
Heater
Models*
4HK*6500506 0.5 Med/#3 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/#3 5.6 7.5 19.2 25.6 2.8 3.75 5.6 7.5 5.6 7.5
MX12B
4HK*6501006 0.5 Med/#3 7.2 9.6 24.6 32.8 3.6 4.8 7.2 9.6 7.2 9.6
4HK16501306 0.5 Med/#3 9.8 13 33.3 44.4 3.3 4.3 6.5 8.6 9.8 13
4HK165N1506 0.5 Med/#3 10.8 14.4 36.9 49.1 3.6 4.8 7.2 9.6 10.8 14.4
4HK*6500506 0.5 Med/#3 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/#3 5.6 7.5 19.2 25.6 2.8 3.75 5.6 7.5 5.6 7.5
4HK*6501006 0.5 MedHi/#2 7.2 9.6 24.6 32.8 3.6 4.8 7.2 9.6 7.2 9.6
MX12D
4HK16501306 0.5 MedHi/#2 9.8 13 33.3 44.4 3.3 4.3 6.5 8.6 9.8 13
4HK16501506 0.5 MedHi/#2 10.8 14.4 36.9 49.1 3.6 4.8 7.2 9.6 10.8 14.4
4HK16501806 0.5 MedHi/#2 13.2 17.6 45.1 60.1 3.3 4.4 6.6 8.8 13.2 17.6
4HK16502006 0.5 MedHi/#2 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/#5 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 5.6 7.5 19.2 25.6 2.8 3.75 5.6 7.5 5.6 7.5
4HK*6501006 0.5 MedLo/#4 7.2 9.6 24.6 32.8 3.6 4.8 7 .2 9.6 7.2 9.6
MX16C
4HK16501306 0.5 MedLo/#4 9.8 13 33.3 44.4 3.3 4.3 6.5 8.6 9.8 13
4HK16501506 0.5 MedLo/#4 10.8 14.4 36.9 49.1 3.6 4.8 7.2 9.6 10.8 14.4
4HK16501806 0.5 Med/#3 13.2 17.6 45.1 60.1 3.3 4.4 6.6 8.8 13.2 17.6
4HK16502006 0.5 Med/#3 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 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/#5 7.2 9.6 24.6 32.8 3.6 4.8 7.2 9.6 7.2 9.6
4HK16501306 0.5 Lo/#5 9.8 13 33.3 44.4 3.3 4.3 6.5 8.6 9.8 13
MX20D
4HK16501506 0.5 Lo/#5 10.8 14.4 36.9 49.1 3.6 4.8 7.2 9.6 10.8 14.4
4HK16501806 0.5 Lo/#5 13.2 17.6 45.1 60.1 3.3 4.4 6.6 8.8 13.2 17.6
4HK16502006 0.5 Lo/#5 14.4 19.2 49.2 65.5 3.6 4.8 7.2 9.6 14.4 19.2
4HK16502506 0.5 Lo/#5 18 24 61.5 81.9 3.6 4.8 10.8 14.4 18 24
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 230v 208v 230v 208v 230v 208v 230v 208v 230v
Johnson Controls Unitary Products 9
Page 10
819682-UIM-A-0212
TABLE 1 1:
Models
Electrical Data - (For
Single Source
Heater
Models*
Power Supply) - Copper Wire 1 Ø - 208/230-1-60
Heater
Amps
240V
Min. Circuit Ampacity
208V 230V 208V 230V 208V 230V
4HK*6500506A 20 25.1 28.5 30 30 10 10
4HK*6500806A 31.3 37.1 42.6 40 45 8 8
MX12B
4HK*6501006A 40 46.7 53.5 50 60 8 6
4HK16501306A 54.2 62.1 71.2 70 80 4 4
4HK165N1506A 60 68.4 78.5 80 90 4 3
4HK*6500506 20 25.1 28.5 30 30 10 10
4HK*6500806 31.3 37.1 42.6 40 45 8 8
4HK*6501006 40 46.7 53.5 50 60 8 6
MX12D
4HK16501306A 54.2 62.4 71.2 70 80 4 4
4HK16501506 60 68.4 78.5 80 90 4 4
4HK16501806 73.3 82.9 95.1 90 100 3 3
4HK16502006 80 90 103.5 100 110 3 2
4HK*6500506 20 26.8 30.1 30 35 10 10
4HK*6500806 31.3 38.8 43.6 40 50 8 8
4HK*6501006 40 48.4 54.5 50 60 8 6
MX16C
4HK16501306A 54.2 64 72.8 70 80 4 4
4HK16501506 60 70 79.5 80 90 4 4
4HK16501806 73.3 84.5 96.1 90 100 3 3
4HK16502006 80 91.6 104.5 100 110 3 2
4HK*6500806 31.3 41.2 46.6 45 50 8 8
4HK*6501006 40 50.8 57.5 60 60 8 6
4HK16501306A 54.2 66.4 75.2 70 80 4 4
MX20D
4HK16501506 60 72.4 82.5 80 90 4 4
4HK16501806 73.3 86.9 99.1 90 110 3 3
4HK16502006 80 94.1 107.5 100 110 3 2
4HK16502506 100 115.7 132.5 125 150 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.
Amps/Type
1
75°C Wire Size - AWG
TABLE 12:
Electrical Data - (For
Multi-Source
Power Supply) - Copper Wire 1 Ø - 208/230-1-60
Min. Circuit Ampacity
Models
Heater
Models
1st 2nd 3rd 1st 2nd 3rd 1st 2nd 3rd
Circuit Circuit Circuit
208/230 208/230 208/230 208/230 208/230 208/230 208/230 208/230 208/230
MX12B
4HK16501306A 42.6/48.6 17.1/20.6 -/- 45/60 20/25 -/- 8/8 10/10 4HK165N1506A 46.7/53.5 19.2/23.1 -/- 50/60 25/25 -/- 8/6 10/10 4HK16501306A 40.8/47.1 21.6/24.1 -/- 50/50 25/25 -/- 8/8 10/10
MX12D
4HK16501506 46.7/53.5 19.2/23.1 -/- 50/60 25/25 -/- 8/6 10/10 4HK16501806 43/49.4 37.1/44 -/- 50/60 40/50 -/- 8/6 8/8 4HK16502006 46.7/53.5 40.9/48.1 -/- 50/60 45/50 -/- 8/6 8/8 -
4HK16501306A 41.6/47.9 22.4/25.0 -/- 50/50 25/30 -/- 8/8 10/8
MX16C
4HK16501506 48.4/55.1 19.1/23.2 -/- 50/60 25/25 -/- 8/6 10/10 4HK16501806 44.6/50.3 37.0/44.1 -/- 50/60 40/50 -/- 8/6 8/8 4HK16502006 48.4/54.5 40.8/48.2 -/- 50/60 45/50 -/- 6/6 8/6 -
4HK16501306A 42.9/49.1 23.6/26.2 -/- 50/50 25/30 -/- 8/8 10/8
4HK16501506 50.8/57.5 19.4/23.7 -/- 60/60 25/25 -/- 8/6 10/10 -
MX20D
4HK16501806 47.1/53.3 37.3/44.6 -/- 50/60 40/50 -/- 8/6 8/8 4HK16502006 50.8/57.5 41.1/48.7 -/- 60/60 45/50 -/- 6/6 8/6 4HK16502506 50.8/57.5 41.1/48.7 19.4/23.7 60/60 45/50 25/25 6/6 8/6 10/10
1.O.C.P. = Over Current Protection device, must be HACR type Circuit Breaker or Time Delay fuse.
Max. O.C.P.
Amps/Type
1
75°C Wire Size - AWG
10 Johnson Controls Unitary Products
Page 11
819682-UIM-A-0212
\
TABLE 13:
Electrical Data - 208/230-3-60
Models
MX12B
Heat Kit -
Three Phase
4HK06501025 0.5 Med/#3 7.2 9.6 24.6 32.8 7.2 9.6 7.2 9.6 7.2 9.6
4HK065N1525 0.5 Med/#3 10.8 14.4 36.9 49.1 10.8 14.4 10.8 14.4 10.8 14.4
Max.
Static
Min.
Speed
Tap
Total Heat
KW MBH W1 Only W2 Only W1 + W2
208V 230V 208V 230V 208V 230V 208V 230V 208V 230V
4HK06501025 0.5 Med/#3 7.2 9.6 24.6 32.8 7.2 9.6 7.2 9.6 7.2 9.6
MX12D
4HK06501525 0.5 Med/#3 10.8 14.4 36.9 49.1 10.8 14.4 10.8 14.4 10.8 14.4
4HK06501825 0.5 Med/#3 12.9 17.2 44.7 58.7 12.9 17.2 12.9 17.2 12.9 17.2
4HK06501025 0.5 Lo/#5 7.2 9.6 24.6 32.8 7.2 9.6 7.2 9.6 7.2 9.6
MX16C
4HK06501525 0.5 Lo/#5 10.8 14.4 36.9 49.1 10.8 14.4 10.8 14.4 10.8 14.4
4HK06501825 0.5 Lo/#5 12.9 17.2 44.7 58.7 12.9 17.2 12.9 17.2 12.9 17.2
4HK06501025 0.5 Lo/#5 7.2 9.6 24.6 32.8 7.2 9.6 7.2 9.6 7.2 9.6
MX20D
4HK06501525 0.5 Lo/#5 10.8 14.4 36.9 49.1 10.8 14.4 10.8 14.4 10.8 14.4
4HK16502525 0.5 Lo/#5 18 24 61.4 81.4 9 12 18 24 18 24
1.See conversion Table 10.
TABLE 14:
Electrical Data - (For
Models
MX12B
Single Source
Heat Kit -
Three Phase
Power Supply) - Copper Wire - 208/230-3-60
Heater
Amps
240V
Min. Circuit Ampacity
208V 230V 208V 230V 208V 230V
4HK06501025 23.1 28.5 32.4 30 35 10 8
4HK065N1525 34.7 41 46.9 45 50 8 8
4HK06501025 23.1 28.5 32.4 30 35 10 8
MX12D
4HK06501525 34.7 41.1 46.9 45 50 8 8
4HK06501825 41.4 48.4 55.3 50 60 8 6
4HK06501025 23.1 30.1 33.3 35 35 10 8
MX16C
4HK06501525 34.7 42.6 47.8 45 50 8 8
4HK06501825 41.4 49.9 56.2 60 60 8 6
4HK06501025 23.1 32.6 36.3 40 40 10 8
MX20D
4HK06501525 34.7 45.4 50.8 50 60 8 8
4HK06501825 34.7 70.1 79.7 80 90 8 6
1.O.C.P. = Over Current Protection device, must be HACR type Circuit Breaker or Time Delay fuse.
2.Heaters are 3 Phase.
1
Max. O.C.P.
Field Wiring
1
Amps/Type
KW Staging
75°C Wire Size - AWG
TABLE 15:
Electrical Data - (For
Models
Heater
Model
Multi-Source
Minimum Circuit Ampacity
1st 2nd 3rd 1st 2nd 3rd 1st 2nd 3rd
Power Supply) - Copper Wire - 208/230-3-60
Max. O.C.P.
Circuit
1
Amps/Type
75°C Wire Size - AWG
208/230 208/230 208/230 208/230 208/230 208/230 208/230 208/230 208/230
MX20D 4HK16502525 45.1/50.8 22.8/27.6 –/– 45/50 20/20 –/– 8/6 10/10 –/–
1.O.C.P. = Over Current Protection device, must be HACR type Circuit Breaker or Time Delay fuse.
Johnson Controls Unitary Products 11
Page 12
819682-UIM-A-0212
TABLE 16:
Air Flow Data - 60 Hz Models
208 Volt
1
CFM
@ External Static Pressure - IWC
m³/min @ External Static Pressure - Pascal
Models
Blower
Motor
Speed
0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00 0.025 0.050 0.075 0.100 0.125 0.150 0.175 0.200 0.225 0.250
Hi/#1 1234 1212 1178 1145 1079 1043 995 911 623 371 34.54 33.94 33.00 32.05 30.20 29.20 27.87 25.50 17.44 10.40
MedHi/#2 1099 1066 1037 987 933 888 801 NA NA NA 30.76 29.86 29.03 27.65 26.13 24.86 22.43 NA NA NA
MX12B
Med/#3 928 892 840 768 731 664 566 523 476 226 25.99 24.98 23.53 21.52 20.48 18.60 15.84 14.64 13.33 6.32
MedLo/#4 859 705 612 502 472 403 328 NA NA NA 24.06 19.75 17.12 14.06 13.21 11.28 9.19 NA NA NA
Lo/#5 835 635 451 396 315 NA NA NA NA NA 23.37 17.79 12.62 11.08 8.83 NA NA NA NA NA
Hi/#1 1510 1366 1307 1234 1176 1116 1051 917 834 696 42.27 38.25 36.60 34.54 32.93 31.24 29.44 25.69 23.34 19.48
MedHi/#2 1421 1224 1120 1051 988 914 780 740 669 583 39.77 34.28 31.36 29.43 27.65 25.60 21.84 20.72 18.73 16.31
MX12D
Med/#3 1345 1124 889 812 675 615 568 501 424 384 37.65 31.48 24.90 22.74 18.90 17.22 15.89 14.03 11.87 10.75
MedLo/#4 1272 1034 616 518 454 351 313 271 250 210 35.61 28.95 17.23 14.52 12.71 9.84 8.76 7.57 6.99 5.88
Lo/#5 1219 928 451 349 287 244 212 110 NA NA 34.12 25.98 12.62 9.77 8.05 6.83 5.93 3.08 NA NA
Hi/#1 1805 1771 1737 1696 1652 1587 1531 1469 1371 924 50.54 49.60 48.64 47.48 46.27 44.43 42.86 41.14 38.37 25.87
MedHi/#2 1637 1589 1558 1512 1455 1397 1343 1291 1194 853 45.83 44.48 43.63 42.34 40.73 39.11 37.59 36.14 33.44 23.87
MX16C
Med/#3 1470 1424 1381 1327 1266 1211 1154 1068 1005 760 41.16 39.87 38.67 37.14 35.44 33.91 32.30 29.90 28.13 21.29
MedLo/#4 1327 1237 1171 1109 1049 976 875 807 720 658 37.15 34.63 32.79 31.06 29.37 27.34 24.49 22.59 20.16 18.42
Lo/#5 1279 1063 992 935 858 762 667 587 508 428 35.82 29.76 27.78 26.19 24.03 21.33 18.68 16.44 14.23 11.98
Hi/#1 2075 2031 1996 1957 1912 1862 1813 1762 1693 1524 58.11 56.88 55.90 54.80 53.53 52.14 50.76 49.33 47.42 42.66
MedHi/#2 1896 1849 1808 1766 1720 1679 1636 1585 1532 1461 53.10 51.77 50.63 49.46 48.16 47.02 45.80 44.38 42.89 40.90
MX20D
Med/#3 1685 1638 1587 1539 1489 1444 1398 1349 1294 1248 47.19 45.86 44.44 43.10 41.69 40.44 39.14 37.76 36.23 34.95
MedLo/#4 1527 1481 1425 1370 1323 1277 1227 1166 1118 1065 42.77 41.48 39.90 38.36 37.04 35.75 34.35 32.64 31.32 29.82
Lo/#5 1465 1301 1244 1177 1119 1065 998 927 833 795 41.03 36.42 34.84 32.96 31.33 29.81 27.93 25.96 23.31 22.26
230 Volt
2
CFM
@ External Static Pressure - IWC
m³/min @ External Static Pressure - Pascal
Models
Blower
Motor
Speed
0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00 0.025 0.050 0.075 0.100 0.125 0.150 0.175 0.200 0.225 0.250
Hi/#1 1264 1241 1209 1184 1132 1067 1037 988 821 493 35.40 34.74 33.87 33.16 31.70 29.87 29.04 27.66 22.98 13.81
MedHi/#2 1107 1073 1048 997 948 902 855 778 586 370 30.98 30.05 29.34 27.93 26.55 25.25 23.93 21.79 16.41 10.36
MX12B
Med/#3 937 904 861 807 736 682 582 557 501 357 26.24 25.32 24.10 22.59 20.62 19.09 16.31 15.59 14.04 10.01
MedLo/#4 875 688 629 559 465 418 348 377 NA NA 24.51 19.25 17.62 15.66 13.03 11.70 9.75 10.54 NA NA
Lo/#5 839 549 466 404 328 285 205 181 154 NA 23.49 15.38 13.06 11.33 9.19 7.97 5.75 5.08 4.30 NA
Hi/#1 1485 1362 1304 1248 1180 1130 1065 985 863 708 41.59 38.13 36.52 34.95 33.05 31.63 29.83 27.58 24.18 19.83
MedHi/#2 1408 1198 1119 1054 989 911 801 746 701 618 39.43 33.54 31.34 29.50 27.70 25.52 22.42 20.88 19.63 17.31
MX12D
Med/#3 1348 1115 888 817 676 635 577 528 447 407 37.74 31.23 24.86 22.89 18.93 17.78 16.15 14.78 12.51 11.39
MedLo/#4 1278 1019 580 518 454 363 318 284 262 225 35.78 28.52 16.23 14.51 12.71 10.18 8.89 7.95 7.35 6.30
Lo/#5 1240 964 441 352 294 252 214 187 NA NA 34.72 27.00 12.34 9.87 8.23 7.05 6.00 5.24 NA NA
Hi/#1 1869 1833 1804 1772 1728 1674 1623 1554 1150 383 52.33 51.33 50.50 49.63 48.38 46.89 45.43 43.51 32.19 10.72
MedHi/#2 1695 1653 1627 1576 1527 1477 1419 1370 751 NA 47.45 46.29 45.56 44.13 42.75 41.37 39.73 38.35 21.02 NA
MX16C
Med/#3 1546 1513 1468 1417 1361 1310 1253 1120 892 387 43.29 42.36 41.10 39.67 38.10 36.67 35.10 31.36 24.97 10.84
MedLo/#4 1327 1283 1223 1163 1105 1036 857 768 614 384 37.16 35.93 34.24 32.56 30.93 29.00 24.00 21.50 17.20 10.76
Lo/#5 1241 1103 1037 968 891 759 629 581 523 381 34.74 30.88 29.03 27.11 24.95 21.24 17.61 16.28 14.66 10.67
Hi/#1 2085 2046 2008 1976 1935 1879 1836 1797 1724 1559 58.37 57.28 56.21 55.32 54.19 52.62 51.41 50.32 48.26 43.66
MedHi/#2 1917 1868 1829 1792 1731 1702 1655 1615 1568 1485 53.68 52.30 51.20 50.16 48.47 47.66 46.33 45.22 43.91 41.58
MX20D
Med/#3 1678 1645 1601 1556 1502 1461 1406 1362 1319 1280 46.98 46.07 44.82 43.57 42.04 40.90 39.36 38.14 36.94 35.84
MedLo/#4 1534 1494 1435 1384 1344 1289 1236 1192 1142 1086 42.97 41.82 40.18 38.75 37.62 36.08 34.62 33.39 31.97 30.41
Lo/#5 1410 1259 1211 1148 1095 1038 996 940 840 800 39.47 35.24 33.90 32.13 30.65 29.06 27.90 26.32 23.53 22.40
NOTE: Air flow data shown above 1/2” w.c. external static pressure is for REFERENCE ONLY. Maximum allowable external static when electric heat is used is limited to
1/2” w.c. Maximum allowable external static pressure may also be limite d by minimum CFM requirements for proper Heat Pump operation.
1.Dry coil conditions only, tested without filters.
† Speed temp High #1 not recommended for t he unit.
Air handler units are UL Listed up to 0.5" w.c. external static pressure, including air filter, wet coil, and largest kW size heater, unless otherwise noted.
12 Johnson Controls Unitary Products
Page 13
819682-UIM-A-0212
Air Handler Control Wiring
Typical A/C - Cooling only Applications
THERMOSTAT
AIR HANDLER
BOARD
1 - STAGE
AIR CONDITIONING
RR
G
Y
W1
W2
C
G
W1
W2
Y
C
Y/Y2
Y1
O
HUM
X / L
COM
HUMIDISTAT
THERMOSTAT
AIR HANDLER
BOARD
1 - STAGE
AIR CONDITIONING
RR
G
Y
W1
W2
C
G
W1
W2
Y
C
Y/Y2
Y1
O
HUM
X / L
COM
HUMIDISTAT
Air Handler Control Wiring
Typical A/C with Electric Heat Applications
CONTROL WIRING - Air Handler
And UPG Single Stage HP Systems
Single Stage HP with Standard Demand Defrost Control Board
THERMOSTAT
AIR HANDLER
BOARD
1 - STAGE
HEAT PUMP
RR R
GG
Y
W / W1
W
O
O
O
X / L X / L
X / L
C C
Y/Y2
Y1
Y
W1 66
W2
W1
HUM
COM
HUMIDISTAT
*
W2
E
FIGURE 10:
* Optional dehumidification humidistat switch contacts open on rise.
Cooling Models with Electric Heat Wiring
Notes:
1. “Y/Y2” Terminal on air handler control board must be connected for full CFM and applications requiring 60 second blower off delay for SEER enhancement.
2. Remove humidistat jumper on air handler control board.
3. For heat pump applications - set MODE jumper on air handler control board to the HP position.
4. To change quantity of heat during HP defrost cycle - reverse connections at W1 and W2 on air handler control board.
FIGURE 11: Single-Stage Heat Pump Wiring
* Optional dehumidification humidistat switch contacts open on rise.
Notes:
1. “Y/Y2” Terminal on air handler control board must be connected for full CFM and applications requiring 60 second blower off delay for SEER enhancement.
2. Remove humidistat jumper on air handler control board.
3. For heat pump applications - set MODE jumper on air handler control board to the HP position.
4. To change quantity of heat during HP defrost cycle - reverse connections at W1 and W2 on air handler control board.
Johnson Controls Unitary Products 13
Page 14
819682-UIM-A-0212
CONTROL WIRING - Air Handler & UPG HP Systems
Two Stage H/P with York Guard VI Board & Copeland “Ultra Tech”
Conventional Application - Not Hot Heat Pump
THERMOSTAT
AIR HANDLER
BOARD
2 - STAGE SCROLL
HEAT PUMP
RR R
GG
Y2
E
W
W
O O
O
X / L X / L X / L
C
C
Y/Y2
Y1
Y1
Y2 OUT
Y2
W2 OUT
W1 OUT
BS
W2
W1
HUM
COM
HUMIDISTAT
*
Y1
FIGURE 12: Two-Stage Heat Pump Wiring
* Optional dehumidification humidistat switch contacts open on rise.
Notes:
1. “Y/Y2” Terminal on air handler control board must be connected for full CFM and applications requiring 60 second blower off delay for SEER enhancement.
2. Remove humidistat jumper on air handler control board.
3. For heat pump applications - set MODE jumper on air handler control board to the HP position.
4. To change quantity of heat during HP defrost cycle - reverse connections at W1 and 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.
14 Johnson Controls Unitary Products
Page 15
SECTION XI: WIRING DIAGRAM
819682-UIM-A-0212
FIGURE 13: Wiring Diagram - MX12-16
Johnson Controls Unitary Products 15
Page 16
FIGURE 14: Wiring Diagram - MX20
Subject to change without notice. Published in U.S.A. 819682-UIM-A-0212
Copyright © 2012 by Johnson Controls, Inc. All rights reserved. Supersedes: 628582-UIM-A-0111
Johnson Controls Unitar y Prod uc ts
5005 York Drive
Norman, OK 73069
Loading...