Johnson Controls JMVT Series User manual

Johnson Controls Ducted Systems 6146293-UIM-A-0522
Variable Speed ECM
Modular Multi-position Air Handlers
Models: JMVT Series 208/230 V
- Single-Phase and Three-Phase
INSTALLATION MANUAL
®
List of sections
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Unit installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Ductwork and connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Electric heater installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Line power connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Low voltage control connections . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Required control set-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Airflow and comfort setting selection . . . . . . . . . . . . . . . . . . . . .16
Unit data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Air system adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Wiring diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Start-up sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
List of figures
Return air duct attachment and component location . . . . . . . . . . . . . 2
Dimensions and duct connection dimensions . . . . . . . . . . . . . . . . . . 3
Typical installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Coil and air handler attachment details . . . . . . . . . . . . . . . . . . . . . . . 4
Duct system - modular blower - right hand . . . . . . . . . . . . . . . . . . . . 4
Gasket location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Suspension support locations for horizontal applications
- that require the drain pan extension . . . . . . . . . . . . . . . . . . . . . . . . 6
- that do not require the drain pan extension . . . . . . . . . . . . . . . . . . . 6
Duct attachment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Ductwork transition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Line power connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Control board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Cooling models with and without electric heat wiring . . . . . . . . . . . . . 9
Control wiring - premium ECM blower and HMH7 heat pump
- conventional wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Control wiring - premium ECM blower and multi-stage air conditioner
- conventional wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Control wiring - premium ECM blower and multi-stage heat pump
- conventional wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Control wiring - premium ECM blower and single-stage heat pump
- conventional wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Air handler with communicating AC or HP . . . . . . . . . . . . . . . . . . . .10
Multi-wire terminal connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Variable speed board S1 jumper . . . . . . . . . . . . . . . . . . . . . . . . . . .11
DIP-10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
DIP-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Variable speed board dip switch locations - heat kit . . . . . . . . . . . . .17
Duct static measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Wiring diagram - ECM - single-phase heat kits . . . . . . . . . . . . . . . .22
Wiring diagram - 8HK three-phase heat kits 208/230 V . . . . . . . . . .23
List of tables
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Low voltage connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Stage delay switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Pushbutton operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Fault codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Fault list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Heat relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Continuous fan switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Comfort setting selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Physical and electrical data - cooling only . . . . . . . . . . . . . . . . . . . . 16
Electrical data - cooling only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Electrical heat: minimum fan CFM DIP switch settings
for single-phase heat kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Electrical heat: minimum fan CFM for three-phase heat kits . . . . . .17
Electrical heat only: default fan speeds for FER compliance . . . . . .18
Aux heat configuration - stage 1 kW dip switch settings . . . . . . . . . .18
Application factors - rated CFM versus actual CFM . . . . . . . . . . . . .18
kW and MBH conversions - for total power input requirement . . . . .18
Electric heat performance data: 208/230-1-60 and 208/230-3-60 . .18
Electrical data for single source power supply: 208/230-1-60 . . . . .18
Electrical data for multi-source power supply: 208/230-1-60 . . . . . .19
Electrical data for single source power supply: 208/230-3-60 . . . . .19
Electrical data for multi-source power supply: 208/230-3-60 . . . . . .20
Aux heat configuration - heat kit selection . . . . . . . . . . . . . . . . . . . .20
Airflow data (CFM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Section I: General
The modular air handler series provides the flexibility for installation in
any position. This unit may be used for upflow, downflow, horizontal
right, or horizontal left applications.
These units may be located in a closet, utility room, attic, crawl space,
or basement. These versatile models may be used for cooling or heat
pump operation with or without electric heat or indoor coil.
Top or side power and control wiring, color coded leads for control wir-
ing, easy to install drain connections, and electric heaters all combine to
make the installation easy and minimize installation cost.
Electric heat kits are available as field installed accessories. Single-
phase kits are available from 2.5 kW to 25 kW. 208/230V three-phase
kits are available from 10 kW to 25 kW.
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. It is also used to alert
against unsafe practices and hazards involving only property damage.

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2 Johnson Controls Ducted Systems
Safety requirements
1. Failure to carefully read and follow all instructions in this manual
can result in air handler malfunction, death, personal injury, or
property damage.
2. Always install this air handler in accordance with all national and
local building and safety codes and requirements, local plumbing
or wastewater codes, and other applicable codes.
3. Only install this air handler in a location and position specified in the
Unit installation.
4. Do not use the air handler for temporary heating of buildings or
structures under construction.
5. Always install the air handler to operate within the air handler’s
intended maximum outlet air temperature.
6. Clearance from combustible material is provided under Clearances
in Unit installation.
7. The unit rating plate displays the air handler model number. The
unit dimensions for the supply air plenum are provided in Figure 2
and Table 1. Always install the plenum according to the instruc-
tions.
WARNING
FIRE OR ELECTRICAL HAZARD
Failure to follow the safety warnings exactly could result in serious
injury, death or property damage. Afire or electrical hazard may result
causing property damage, personal injury or loss of life.
WARNING
The air handler area must not be used as a broom closet or for any
other storage purposes, as a fire hazard may be created. Never store
items such as the following on, near or in contact with the furnace.
1. Spray or aerosol cans, rags, brooms, dust mops, vacuum clean-
ers or other cleaning tools.
2. Soap powders, bleaches, waxes or other Cleaning compounds;
plastic items or containers; gasoline, kerosene, cigarette lighter
fluid, dry cleaning fluids or other volatile fluid.
3. Paint thinners and other painting compounds.
4. Paper bags, boxes or other paper products.
Never operate the air handler with the blower door removed. To do so
could result in serious personal injury and/or equipment damage.
WARNING
This appliance is not intended for use by persons (including children)
with reduced physical, sensory or mental capabilities, or lack of expe-
rience and knowledge, unless they have been given supervision or
instruction concerning use of the appliance by a person responsible
for their safety.
Children should be supervised to ensure that they do not play with the
appliance.
WARNING
Improper installation, adjustment, alteration, or maintenance may cre-
ate a condition where the operation of the product could cause per-
sonal injury or property damage. Refer to this manual for assistance,
or for additional information, consult a qualified contractor, installer, or
service agency.
CAUTION
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.
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NOTICE
To ensure a correct match for this indoor product, refer to the current
Tabular Data Sheet for the outdoor equipment selected for the system
application. If the indoor product model is not listed in the Tabular
Data Sheet included with the outdoor unit, to access the current ver-
sion of the Tabular Data Sheet, go to the Residential Equipment &
Supplies section of the Offering Catalog at
www.simplygettingthejobdone.com or scan the QR code provided on
the outdoor unit rating plate.
CAUTION
Do not lift the air handler by the cabinet braces. The cabinet braces
could become disengaged from the cabinet causing the air handler to
fall, potentially causing injury or damaging property. See Figure 1 for
the location of the cabinet braces. Lift the air handler by tightly grip-
ping the casing.
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Figure 1: Return air duct attachment and component location
A1756-001
Screw Ductwork
Front view
Blower compartment
Cabinet brace
Coil compartment
(access panel removed)
Primary drain pan
Cabinet brace
Screw
Side view
Ductwork Screw
Screw
Secondary drain
upflow 3/4-in. NPT
Vapor refrigerant
line connection
Liquid refrigerant
line connection
Primary drain
3/4 in. NPT

6146293-UIM-A-0522
Johnson Controls Ducted Systems 3
8. It is necessary to maintain clearances for servicing and allow
access to the electric heaters and blower.
9. It is necessary to verify the unit rating plate and power supply to
ensure that the electrical characteristics match.
10. When attaching ductwork with screws, carefully fasten the screws
and keep them within 5/8 in. of the sides and back of the air handler.
11. Install the air handler so the electrical components are protected
from water.
12. Installing and servicing heating and cooling equipment can be haz-
ardous due to the electrical components. Only trained and licensed
personnel must install, repair, or service heating and cooling equip-
ment. Unlicensed service personnel can perform basic mainte-
nance functions such as cleaning and replacing the air filters. When
working on heating and cooling equipment, the precautions in the
manuals and on the labels attached to the unit and other safety pre-
cautions must be observed as applicable.
13. 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 instruc-
tions are required as a minimum for a safe installation.
14. These models are not CSA listed or approved for installation into a
HUD-approved modular home or a manufactured (mobile) home.
Inspection
Upon receiving the air handler, inspect for possible damage during tran-
sit. If damage is evident, note the extent of the damage on the carrier’s
freight bill. A separate request for inspection by the carrier’s agent must
be made in writing. Consult the local distributor for more information.
Before installation, check the unit for screws or bolts loosened in transit.
There are no internal shipping or spacer brackets that need removing.
You must verify that all accessories, such as heater kits and coils, are
available. Complete installation of these accessories or field conversion
of the unit before setting the unit in place or connecting any wiring,
ductwork, or piping.
CAUTION
These air handlers must be transported and handled in an upright,
upflow position. Failure to do so may result in unit damage and per-
sonal injury. Configuration conversions must be done at the site of
installation.
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Figure 2: Dimensions and duct connection dimensions
Table 1: Dimensions1
1.All dimensions are in inches.
Models Dimensions Wiring knockouts2
2.Actual size (conduit size)
ABCD E F
Height (in.) Width (in.) Opening widths (in.) Power (in.) Control (in.)
JMVT12B 22 3/4 17 1/2 16 1/2 16 1/2 7/8 (1/2)
1 3/8 (1)
1 23/32 (1 1/4) 7/8 (1/2)
JMVT16C 22 3/4 21 20 20
JMVT17C 22 3/4 21 20 20
JMVT20D 22 3/4 24 1/2 23 1/2 23 1/2
A1712-001
B20 1/2 in.
21 1/2 in.
F
A
D
12 3/16 in.
19 1/8 in.
C
E
Bottom inlet
dimensions
Service
disconnect panel
Top outlet
dimensions

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4 Johnson Controls Ducted Systems
Section III: Unit installation
Unit sizing
• The size of the unit must be based on an acceptable heat loss or
gain calculation for the structure. Use Air Conditioning Contrac-
tors of America (ACCA) Manual J or another approved method.
• Only connect the air handler to a duct system that has an external
static pressure within the allowable range.
• Airflow must be within the minimum and maximum limits
approved for electric heat, indoor coils, and outdoor units.
• When an air handler is installed so that supply ducts carry air cir-
culated by the air handler to areas outside the space containing
the air handler, the return air is also handled by one or more ducts
sealed to the air handler casing and terminating in the space to
be cooled or heated.
• Refer to the unit rating plate for the air handler model number and
then see the dimensions page of this manual for supply air ple-
num dimensions. The plenum must be installed according to the
instructions.
• The installer must check available supply power and verify that it
is within the normal operating voltage range for the unit. The
acceptable voltage range for these units is as follows:
Clearances
It is essential to provide the following clearances:
• Maintenance and servicing access - minimum 36 in. from the
front of the unit for blower motor
• The supply air ductwork connected to this unit is designed for 1
in. clearance for the first 18 in. of duct length to combustible
materials.
• 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 the owner’s or dealer’s
installation plans. If location has not been decided, consider the follow-
ing in choosing a suitable location:
• Select a location with adequate structural support, space for ser-
vice access, and clearance for air return and supply duct connec-
tions.
• Do not use hanging brackets to wall mount this single piece air
handler unit.
• Normal operating sound levels may be objectionable if the air
handler is placed directly over some rooms such as bedrooms or
a study.
• When installing an indoor coil in an attic or above a finished ceil-
ing, an auxiliary drain pan must be provided under the air handler
as is specified by most local building codes.
• A sufficient electrical supply must be available.
• If locating the unit in an area of high humidity, such as an uncon-
ditioned garage or attic, nuisance sweating of the casing may
occur. On these installations, completely seal the unit duct con-
nections and other openings, and use a wrap of 2 in. fiberglass
insulation with vinyl vapor barrier.
Air handler configuration
These air handler units are ready to install in any position shown in Fig-
ure 3. Some XAH model coils require a section of duct between the
indoor coil and the modular air handler. See Horizontal right applications.
Horizontal right applications
An pan extension to reduce the risk of condensate blow-off is provided
with certain models of XAH indoor coils. It is essential to construct, insu-
late, and attach a 6 in. long duct extension between the XAH coil casing
and the modular air handler casing to allow enough room to install the
pan extension. The suggested method is as follows:
Note:
This method consists of two identical field fabricated duct sections.
1. Attach one duct section to the leaving air end of the XAH indoor coil.
2. Attach the other duct section to the entering air end of the modular
air handler.
3. Attach the two sections together using s-lock and drive cleats. See
Figure 5.
Note: A = modular air handler width (see column B in Table 1)
NOTICE
Avoid handling aluminum coil components after handling the copper
refrigeration piping or other tubing without first cleaning hands.
Entering air temperature limits
Wet bulb temperature (°F) Dry bulb temperature (°F)
Minimum Maximum Minimum Maximum
57 72 65 95
Air handler voltage Normal operating1voltage range
1.Rated in accordance with ARI Standard 110, utilization range A.
208/230-1-60 187 V to 253 V
Figure 3: Typical installation
Figure 4: Coil and air handler attachment details
Figure 5: Duct system - modular blower - right hand
A1701-001
Upflow Downflow Horizontal right
Horizontal left
Heat kit
Heat kit
Heat kit
Heat kit
A1757-001
Outer tie plate (three places)
Blower
Coil
A
A1762-001
3.5 in.
1 in. flange in
1 in. duct liner
S-lock
Drive cleat
20.5 in.

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Johnson Controls Ducted Systems 5
Air handler and coil upflow, downflow, and horizontal posi-
tions where not using a pan extension
1. Apply the neoprene gasket to the return air end of the air handler.
2. Attach three tie plates to the external sides and back of the air
handler casing using screws. See Figure 4.
3. Position the air handler casing over the appropriate coil opening
(depending on configuration). See Figure 3.
4. Attach the three tie plates to the coil casing using screws. See Fig-
ure 4.
5. Remove the coil access panel.
6. Slide the coil out of the coil cabinet and set the coil to the side.
7. Locate the 2 in. wide foam gasket.
8. Apply the foam gasket over the air handler and coil mating seams
on the interior of both unit sides and back.
9. Slide the coil into the housing and install the coil access panel and
coil filter door.
Section IV: Ductwork and connections
Air supply and return may be handled in one of several ways best
suited to the installation. Upflow, horizontal, or downflow applications
may be used.
The vast majority of problems encountered with heating and cooling
systems can be linked to incorrectly designed or installed duct systems.
It is therefore highly important to the success of an installation that the
duct system be correctly designed and installed.
When installing a central air return grille in or near the living space,
design the ductwork so that the grille is not in direct line with the open-
ing in the unit. One or two elbows and acoustical duct liner assure a qui-
eter system. For operation where the return air duct is short or where
sound may be a problem, use acoustical duct liner inside the duct. Use
flexible duct connectors to minimize the transmission of vibration and
noise into the conditioned space.
Insulation of ductwork is a must where it runs through an unheated
space during the heating season or through an uncooled space during
the cooling season.
Use a vapor barrier to prevent absorption of moisture from the sur-
rounding air into the insulation.
Use a transition to match unit opening to correctly size the supply air
duct. Suspend all ducts using flexible hangers and never fasten directly
to the structure.
Ductwork must be fabricated and installed in accordance with local and/
or national codes. This includes the standards of the National Fire Pro-
tection Association for Installation of Air-Conditioning and Ventilating
Systems, NFPA No. 90B. If using electric heat, non-flammable material
must be used. Duct systems must be designed in accordance with
ACCA Manual D.
Horizontal suspension
These air handlers may be suspended in horizontal applications. Use
angle steel support brackets with minimum 3/8 in. threaded rods, sup-
porting the unit from the bottom. Attach the threaded rods at the loca-
tions shown in Figure 7, leaving enough clearance between the door
and the rod so that doors can be easily removed for service.
Figure 6: Gasket location
Tie plate Tie plate
Gasket Gasket
Downflow Upflow A1758-001
WARNING
Do not bring in return air from a location which could introduce haz-
ardous substances into the airflow.
Use 1/2 in. screws to connect ductwork to the cabinet. If pilot holes
are drilled, drill only through the field duct and the unit flange.
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CAUTION
This unit is not designed for non-ducted (freeblow) applications. Do
not operate without ductwork attached to the unit.
Never operate the equipment without filters.
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6 Johnson Controls Ducted Systems
Note: Applications shown are with XAH indoor coils that do not contain
a horizontal right hand extension pan.
Duct flanges
Duct flanges are integrated into the casing. Fold the flanges into posi-
tion and use screws to anchor the flanges.
Unit connections
There are several ways to handle the supply and return air duct connec-
tions. The location and sizing of the connections depends on the situa-
tion and the method best suited to the installation. Upflow, horizontal or
downflow applications may be used.
Use a transition to match unit opening to correctly size the supply air
duct. See Table 1 for air handler unit inlet and outlet dimensions.
Ductwork that is not designed to match the supply air opening can
cause turbulence inside the plenum. This turbulence can change the
airflow patterns across the electric heater limit switch/switches. If the
factory suggested transition cannot be fabricated, attach a block off
plate (approximately 8 in. high and running the full width of the plenum)
to the supply opening. See Figure 10. The use of this block off plate
enables better air circulation across the limit switches.
Air filters
.
Return air filters are required and must be field supplied. Filtration can
be accomplished external to the unit or the integral filter rack may be
used. A 1 in. filter access rack is built into the unit. Remove the filter
access cover and install the correct size filter. Use a standard 1 in. per-
manent or throw away filter. See Table 10 for filter sizes.
CAUTION
Do not lift the air handler by the cabinet brace. The cabinet brace is
held in place by the coil channel. The cabinet brace could become
disengaged from the cabinet causing the air handler to fall, potentially
causing injury or damaging property. See Figure 1 for the location of
the cabinet braces. NOTICE
When assembling the support structure, size to provide clearance for
access door removal.
Figure 7: Suspension support locations for horizontal applications that
require the drain pan extension
Figure 8: Suspension support locations for horizontal applications that
do not require the drain pan extension
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A1769-001
28 3/4 in.
1 1/2 in.
1 in.
Minimum 3/8 in.
threaded rod
Minimum
1 1/2 in. x 1 1/2 in.
(Angle recommended
length 26 in. minimum with
2 in. clearance on both
sides of the air handler)
A1771-001
21 3/4 in.
1 1/2 in.
1 in.
Minimum 3/8 in. threaded rod
Minimum 1 1/2 in. x 1 1/2 in.
(Angle recommended length 26
in. minimum with 2 in. clearance
on both sides of the air handler)
1 in.1 1/2 in.
21 3/4 in.
Minimum 3/8 in. threaded rod
Minimum 1 1/2 in. x 1 1/2 in.
(Angle recommended length 26
in. minimum with 2 in. clearance
on both sides of the air handler)
Figure 9: Duct attachment
Figure 10: Ductwork transition
CAUTION
Use 1/2 in. screws to connect ductwork to the unit. Longer screws
may pierce the drain pan and cause leakage. If drilling pilot holes, drill
only though the field duct and the unit bottom duct flange.
CAUTION
Never operate the equipment without filters.
A1696-001
Duct flanges
A1697-001
Suggested location of block off plateRecommended transition
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Johnson Controls Ducted Systems 7
Section V: 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.
Use only 8HK heater kits, as listed on the air handler name plate and in
these instructions. Use data from Table 12 to Table 23 for information
on the required minimum motor speed tap to use for heating operation
and the maximum over-current protection device required as listed for
combination of air handler and heater kit.
For all applications, the kits can be installed without modification.
Section VI: Line power connections
Power can be brought into the unit through the supply air end of the unit
(top left when unit is vertical) or the left side panel. Use the hole appro-
priate to the unit’s orientation in each installation to bring the conduit
from the disconnect. The power lead conduit must be terminated at the
electrical control box. See Table 11 and Table 19 to Table 23, and the
latest edition of the National Electric Code, or in Canada the Canadian
electrical Code, and local codes to determine correct wire sizing. To
minimize air leakage, seal the wiring entry point on the outside of the
unit.
All electrical connections to air handlers must be made with copper con-
ductors. 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 con-
ductors prior to connection to the air handler.
The chosen conductor and connections must all meet or exceed the
amperage rating of the overcurrent protector (service disconnect or
fuse) in the circuit.
Existing aluminum wire within the structure must be sized correctly for
the application according to the National Electric Code and local codes.
Use caution when sizing aluminum rather than copper conductors, as
aluminum conductors are rated for less current than copper conductors
of the same size.
Section VII: Low voltage control connections
The 24 V power supply is provided by an internally wired low voltage
transformer that is standard on all models. If connecting the unit to a
208 V power supply, the low voltage transformer must be rewired to the
208 V tap. See the Wiring diagram.
Field supplied low voltage wiring can exit the unit through the top right
(when the unit is vertical upflow) or the right side panel. See Figure 2.
Remove the knockout and pierce the 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 in. 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. Connect the field wiring at the pigtails supplied with the air
handler. See Figure 13 to Figure 19 for low voltage system wiring.
NOTICE
In some horizontal applications, the service disconnects on the elec-
tric heat kits must be rotated 180° so the up position of the discon-
nect is the ON position. This service disconnect orientation change is
required by UL 60335-2-40 (in reference to all circuit breakers).
WARNING
Before obtaining access to terminals, all supply circuits must be dis-
connected.
!
WARNING
A fused disconnect switch must be field provided for the unit to be in
compliance with UL 60335-2-40 Clause 7.12.2.
!
Figure 11: Line power connections
.
A1699-001
3
2
1
GND
SD
SD
SD
GND
GND
CKT
L1
L2
L1
L2 SD
SD
SD
CKT
CKT
2
1
L1
L2
L3
L1
L2
L3
L1
L2
L3
GND
CN
CN
CKT
CKT
SD
SD
GND
GND
L1
L2
L1
L2
L1
L2
Two circuits on 15 kW to 20 kW
Three circuits on 25 kW
Field power wiring
(208/230 V)
Component Codes:
GND - Ground lug
SD - Service disconnect
CKT - Circuit
CN - Wire connector/nut
1 Phase Electric Heat Power Options:
3 Phase Electric Heat Power Options:
Single source power
Power supply Power supply Power supply
Terminal block or service disconnect Jumper bar
Two circuits on 15 kW to 20 kW
Three circuits on 25 kW
Multi-source power with jumper bar Multi-source power
No Electric Heat:
Power supply
Single source power Multi-source power
Power supply
Terminal block or service disconnect
Power supply

6146293-UIM-A-0522
8 Johnson Controls Ducted Systems
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 dehumidification operation of the control
during cooling operation. The humidity switch must be connected to the
HUM wire of the control. See Figure 13 to Figure 17.
To enable the dehumidification feature operation, change the HUMIDI-
STAT dip switch to the 1 (ON) position.
NOTICE
All wiring must comply with local and national electrical code require-
ments. Read and heed all unit caution labels.
Figure 12: Control board
A1707-001
Pushbutton
Settings
configuration
EEPLUG
port
Communication
connections
S1 input
HUM output
EAC output
Fuse Status LED
7-segment
display Airflow LED
Aux heat
configuration
Model
configuration
Airflow
configuration
Float
switch
input
Leaving air
temperature
sensor input
Heatkit outputs
Blower motor
connection
Conventional
thermostat
inputs
NOTICE
All wiring must comply with local and national electrical code require-
ments. 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 only brings on the first
stage of electric heat during defrost. See Heat output and Table 7 for
additional information on heat during the defrost cycle.
Table 2: Low voltage connections
Wire Colors Signals Comment
R Red 24 VAC power (fused)
G Green Continuous fan operation Fan speed, adjust at CONT FAN dip switch (SW5)
Y/Y2 Yellow Second or full stage compressor operation
Y1 Yellow and Black First stage compressor operation Not used with outdoor units having single-stage compressors.
W2 Brown Second stage heat operation
W1 White First stage heat operation
O/B Orange Reversing valve operation
EAC Field-supplied wiring Electric air cleaner Located on P4 connector. There is 24 VAC output during indoor blower
operation to energize a pilot duty relay for an electronic air cleaner.
HUM Purple Humidity switch input
C (COM) Blue 24 VAC common
S1 Field-supplied wiring Reduce airflow and set S1 functionality Used only with outdoor units with an S1 out.
Note: Connect the field wiring at the pigtails supplied with the control board harness.

6146293-UIM-A-0522
Johnson Controls Ducted Systems 9
Notes:
1. The Y/Y2 thermostat wire must be connected for full CFM and applications requiring 60 s blower off delay for SEER enhancement.
2. If a humidistat is connected to the HUM input, change the HUMIDISTAT dip switch to the 1 (ON) position.
3. The control is factory set for HP applications. ForAC applications, change the AC/HP dip switch to the 1 (ON) position.
4. Air handler control wiring only: Optional dehumidification humidistat switch contacts open on humidity rise.
Single-stage thermostat
Stage delay:
For conventionally wired systems, it is possible to use a single-stage ther-
mostat even if the air handler is equipped with a multi-stage accessory
electric heat kit. Adjust the stage delay dip switch settings to allow a W2
heat kit output when a W1 input is present after a 10 min, 15 min, or 20
min delay. See Table 3.
.
Figure 13: Cooling models with and without electric heat wiring
Air handler control wiring
Typical AC with cooling only applications
Thermostat Air handler board
RR
G
Y
W1
W2
C
G
W1
W2
Y
C
Y / Y2
Y1
O
HUM
C
(COM)
HUMIDISTAT*
A1724-001
RR
G
Y
W1
W2
C
G
W1
W2
Y
C
Y / Y2
Y1
O
HUM
Typical AC with electric heat applications
HUMIDISTAT*
C
(COM)
HUM EAC ELECTRIC AIR
CLEANER RELAY
Accessory control wiring
24V HUMIDIFIER
RELAY
HUMIDISTAT
Air handler control wiring
Single-stage
air conditioning
Thermostat Air handler board Single-stage
air conditioning
Air handler board
Table 3: Stage delay switches
Stage delay Time (min)
00 Disabled
01 10
10 15
11 20
NOTICE
For Figure 14:
Room thermostat reversing valve operation must be set to B- ener-
gize during heating operation.
S1 mode must be enabled for correct operation. Refer to the required
control set up section in the unit Installation Manual.
Figure 14: Control wiring - premium ECM blower and HMH7 heat
pump - conventional wiring
W2
W1
O/B
Y
S1S1
O/B B
RR
Thermostat Air handler HMH7 heat pump
A1726-001
Figure 15: Control wiring - premium ECM blower and multi-stage air
conditioner - conventional wiring
NOTICE
For Figure 16:
Do not bond any of the outdoor unit Wwires together.
W2 OUT is only required for heat kits with multiple stages of electric
heat. Refer to the wiring diagram for the heat kit used to determine
stages of heat.
W2
W1
W2
Thermostat Air handler
Multi-stage
air conditioner
A1727-001

6146293-UIM-A-0522
10 Johnson Controls Ducted Systems
Notes:
1. The Y/Y2 thermostat wire must be connected for full CFM and applications requiring 60 s blower off delay for SEER enhancement.
2. If a humidistat is connected to the HUM input, change the HUMIDISTAT dip switch to the 1 (ON) position.
3. The control is factory set for HP applications. ForAC applications, change the AC/HP dip switch to the 1 (ON) position.
4. Air handler control wiring only: Optional dehumidification humidistat switch contacts open on humidity rise.
Control wiring using communicating controls
The communicating system consists of several intelligent communicat-
ing components, including the communicating thermostat control
(touch-screen wall thermostat), variable speed air conditioner or heat
pump (21 SEER), or two-stage air conditioner or heat pump (19 SEER),
that continually communicate with each other using a four-wire connec-
tion called the A-R-C-B bus. Commands, operating conditions, and
other data pass continually between components over theA-R-C-B bus.
See Figure 18. The result is a new level of comfort, versatility, and sim-
plicity.
In order to use this air handler in full communications (COMM) mode, it
is essential to install it with the matching touch-screen communicating
control (wall thermostat) and an outdoor air conditioner or heat pump
with a fully communicating control.
Another option is to use this air handler along with the touch-screen
communicating control and a non-communicating outdoor air condi-
tioner through the addition of a communicating AC control board to the
outdoor unit. This system allows full communication between the air
handler, outdoor unit, and touch-screen communication control.
Use the wiring diagram in Figure 18 to connect the air handler control,
touch-screen communicating control (wall thermostat), and communi-
cating outdoor unit. Ensure all of the A+ terminals are connected
together, all of the B- terminals are connected together, all of the C ter-
minals are connected together, and all of the R terminals are connected
together. See Figure 18 and Figure 19. When using a fully communi-
cating system, remove the low voltage signal connector from the control
board at the T3 connection and leave the low voltage wiring in place for
future use. Use the four small screw terminals (ARCB connection) on
the terminal block on the end of the air handler control.
Figure 16: Control wiring - premium ECM blower and multi-stage heat
pump - conventional wiring
O/B
Y2
Y2 OUT
W1 OUT
W2 OUT
Y1
Thermostat Air handler
Multi-stage
heat pump
A1728-001
Figure 17: Control wiring - premium ECM blower and single-stage heat
pump - conventional wiring
Y
W OUT
O
A1729-001
Y / Y2
Y1
O O
Thermostat Air handler
Single-stage
heat pump
CAUTION
If connecting any field-supplied wiring to the control board, such as
when using the communicating control, float switch, or leaving air
temperature switch, you must route the additional wires through the
hole at the lower right of the control box.
Do not add any additional holes to the control box.After attaching the
additional wires to the board, it is essential to plug the remaining hole
around the wires with the sealant putty supplied or with a suitable
waterproof sealant. Failure to seal this hole may allow moisture to
enter the control box and damage the control board.
!
Figure 18: Air handler with communicating AC or HP
Important: Do not place more than one wire under any single com-
munication terminal screw (there are four communication terminal
screws). If more than one wire must be connected to a terminal
screw, attach only the terminal end of a one wire pigtail no longer than
6 in. and use a wire connector to connect the other end of the pigtail
to the other wires. Failure to do this may result in nuisance communi-
cation error faults. See Figure 19.
A+
R
C
B-
A+
R
C
B-
A+
R
C
B-
R
G
Y/Y2
Y1
W2
W1
O
HUM
COM
TOUCH SCREEN
COMMUNICATING
CONTROL
AIR HANDLER
COMMUNICATING
CONTROL
AC/HEAT PUMP
COMMUNICATING
CONTROL
EAC
A0409-001

6146293-UIM-A-0522
Johnson Controls Ducted Systems 11
Float switch input
An optional switch may be connected to the FLOAT SWITCH INPUT
terminals on the control board. This feature is only functional when
used with the communicating control. It is intended for use with a
water overflow switch. To enable this feature, see dip switches 7 and 8
in switch bank SW5. An OFF/OFF (0, 0) position ignores this input. If
using a normally closed switch, set these switches in the OFF/ON (0, 1)
position. If using a normally open switch, set these switches in the ON/
OFF (1, 0) position. At the room thermostat system settings menu, the
FLOAT SWITCH setting must be changed from its default (Disabled)
setting. If using a normally closed switch, choose Enabled (Open). If
using a normally open switch, choose Enabled (Closed).
When finished installing condensate overflow detection and on a regu-
lar basis after installation, test the detection equipment to ensure cor-
rect operation.
Leaving air temperature sensor input
A plenum air temperature sensor (thermistor) can be connected to the
LEAVING AIR TEMP SENSOR terminals on the control board. The
communicating control can then monitor the temperature of the supply
air in the plenum.
S1 HMH7 input: The S1 output from an HMH7 model horizontal dis-
charge heat pump must be connected to the S1 input terminal on the
board. Use this input to make the air handler compatible with an HMH7
horizontal discharge heat pump unit without the need for any additional
relays. The air handler control must be put into S1 mode before field
thermostat wiring. See Functionality and operation for detailed
instructions.
Section VIII: Required control set-up
1. Consult system wiring diagram to determine correct thermostat wir-
ing for your system.
2. If using a communicating control or a humidistat for dehumidifica-
tion control is installed, change the HUMIDISTAT switch from OFF
to ON.
3. Set the AC/HP switch to ON for air conditioner or OFF for heat
pump.
4. Set the airflow and comfort setting switches to the correct positions.
5. If using an HMH7 horizontal discharge heat pump, follow the Push-
button Operation chart in Table 4 to set up S1 functionality.
Functionality and operation
Switch positions
S1 functionality - HMH7 operation
The S1 terminal connects the air handler and the HMH7 horizontal dis-
charge unit. When S1 functionality is enabled (see Table 4), the system
operates the indoor blower to better take advantage of the modulating
features of the HMH7 unit, as well as changing the reversing valve logic
to operate with a call for heating. It is essential to enable S1 functional-
ity for the air handler to operate correctly with an HMH7 horizontal dis-
charge heat pump.
To enable S1 mode, with the power off and no field thermostat wires
connected to the air handler control board, complete the following
steps:
1. Set all configuration jumper settings such as heat, cool, AC/HP,
continuous fan speed, and heat kit selection to the appropriate
positions
2. Place a wire jumper from the R terminal on the communicating wir-
ing connection to the S1 input as shown in Figure 20.
3. Apply power to the air handler.
4. When the control is in standby mode, push and hold the pushbutton
located below the 7-segment display for more than 6 s, then
release the pushbutton. The 7-segment display should display S1.
5. Remove power from the air handler and field-installed jumper wire.
To take the unit control out of S1 mode, without any active faults present
and no 24 VAC input on the S1 terminal, push and hold the pushbutton
for more than 6 s and release.
Pushbutton operation
See Table 4 for the control behavior when the pushbutton is pressed.
HUMIDISTAT switch
The HUMIDISTAT switch configures the control to monitor the humidity
switch input. With the switch in the OFF position, the control ignores the
HUM input. With the switch in the ON position, the control monitors the
HUM input to control the blower speed for dehumidification during
cooling operation. For conventionally wired systems, an open-on-rise
humidistat is wired between air handler board R and HUM input to
utilize this feature. The HUM input is strictly for dehumidification during
cooling operation and has no control over the HUM OUT humidifier
connections. To enable this feature for communicating systems, choose
dehumidify with equipment in the service menu dehumidification
setting.
Airflow and comfort setting switches
See separate section.
Figure 19: Multi-wire terminal connection
CAUTION
Failure to test condensate overflow detection equipment could lead to
equipment failure and damage.
Important: The following steps must be taken at the time of installa-
tion to ensure correct system operation.
WIRE
CONNECTOR
THERMOSTAT
TERMINAL
SCREW
NOTE:
Ensure only one wire under
terminal screw.
To connect more than one wire:
A+
R
C
B-
AIR HANDLER
COMMUNICATING
CONTROL BOARD
1. Connect only terminal end of
wire pigtail.
2. Use wire connector to connect
other end of pigtail
to other wires.
A0237-001
OUTDOOR UNIT
INDOOR UNIT
!
Figure 20: Variable speed board S1 jumper
A1730-001
Field-installed jumper

6146293-UIM-A-0522
12 Johnson Controls Ducted Systems
AC/HP switch
The AC/HP switch configures the control to operate correctly with an air
conditioner (ON position) or heat pump (OFF position). With the switch
in the ON position, the control will treat any Y call as a cooling call only.
With the switch in the OFF position, a Y call is treated as a heat pump
heating call unless accompanied by an O (reversing valve) call.
However, if the control is in S1 mode, a Y call with an O/B call is treated
as a heat pump heating call. This tells the control whether the system is
in the heating or cooling mode and energizes the 24 VAC HUM output
when the blower is on and a heating call is present.
Status and fault codes
The control includes an LED that displays status and as well as two 7-segment displays to display fault codes. These codes are shown in Table 5.
The control displays the fault codes until power is removed from the control or the fault condition is no longer present.
Table 4: Pushbutton operation
Duration of connections (s) Control behavior with no thermostat signals present Control behavior with thermostat signals present
< 2
Display operational mode (MODELCONFIG) (5 s) and heat kit
configuration (5 s) Display CFM sent to the indoor blower (5 s)
2 to 6
Display current/stored fault codes if present Bypass ASCD (Reduce timer to zero immediately).
Note: If a fault condition is active, the control continues to dis-
play the active fault. It does not display stored faults until the
active fault is cleared. Clear active faults except fault codes 01, 02, 03, and 04.
Clear active faults except fault codes 01, 02, 03, and 04.
> 6
Set model configuration, but only if the model configuration
error fault is currently active and the fault condition is not pres-
ently active. Bypass ASCD (reduce the timer to zero immediately).
Set heat kit configuration, but only if the heat kit configuration
error fault is currently active and the fault condition is not pres-
ently active.
Set S1 configuration, but only if 24 V is applied to the S1 ter-
minal and a fault condition is not presently active.
The below action only occurs if the above faults (model config-
uration or heat kit configuration) are not active when the push-
button is held for > 6 s.
Clear fault storage. If there is an active fault present, hold the
pushbutton twice: once to clear the active fault and once to
clear fault storage.
Disable S1 functionality, but only if no voltage is applied to the
S1 terminal and a fault condition is not presently active.
> 10
The display toggles between the control software version (5 s)
and the tabular/model data software version (5 s). If an active fault is present, continue to energize the 7- segment displays with the active fault codes.
Table 5: Fault codes
Fault description Status LED
(AN2)
7-Segment
Display 1
(DISP1)
7-Segment
Display 2
(DISP2)
No power to control OFF — —
Control normal operation – no call for operation (standby mode) 2 s ON/2 s OFF — —
Control normal operation – in ASCD period 0.1 s ON/0.1 s OFF d 5, 4, 3, 2, 1
Control normal operation – call for fan only and no active fault codes ON F A
Control normal operation – call for first-stage cooling compressor and no active fault codes ON C 1
Control normal operation – call for second-stage cooling compressor and no active fault codes ON C 2
Max cool – no faults active ON C 3
Control normal operation – call for first-stage heating compressor and no active fault codes ON H 1
Control normal operation – call for second-stage heating compressor and no active fault codes ON H 2
Max heat – no faults active ON H 3
Auxiliary heat 1 – call for first-stage auxiliary heating and no active fault codes ON A 1
Auxiliary heat 2 – call for second-stage auxiliary heating and no active fault codes ON A 2
Stage 1 emergency heat (W without Y) – no faults active ON E 1
Stage 2 emergency heat (W without Y) – no faults active ON E 2
Float Switch Active – no faults active ON f l
Software update – control board ON b 1
Software update – EE plug ON b 2
Software version – control board ON 1 to 9 1 to 9
Software version – EE plug ON 1 to 9 1 to 9
Any fault or event code that would prevent the equipment from running See fault codes — —
No fault codes in memory Two flashes — —
Fault code memory cleared Three flashes — —

6146293-UIM-A-0522
Johnson Controls Ducted Systems 13
Table 6: Fault list
Fault/status Display 1 Display 2 Simplified Description
Internal control fault 0 A Control failure The control failed and must be replaced.
Model configuration changed 0 1
Configuration
faults
The dip switches on model configuration do not match the stored model on the
control. Hold the push button, with no calls to the control, for 6 s to 9 s, to clear
and set the new model. If this error shows, 0 2 also usually show.
Blower match error 0 2
There is a mismatch between the motor and the stored model on the control.A
few different things could cause this:
1. The motor is not compatible with the selected model. Change the model
under model configuration.
2. The motor is not communicating with the control - accompanied by 0 6.
Check your wiring, cycle power on the control, and the motor.
3. The model configuration is not set - accompanied by 0 1. Hold the push-
button for 6 s to 9 s. Ensure there are no calls to the control or the model
does not set.
Heat kit configuration error 0 3
There is a mismatch between the heat kit selection dip switches and the stored
model on the control. A few different things could cause this:
1. The dip switches on heat kit selection do not match the stored heat kit on
the control. Hold the pushbutton, with no calls to the control, for 6 s to 9 s,
to clear and set the new model.
2. The heat kit selected under heat kit selection does not match the model
stored in the control. Check your model configuration and your heat kit
configuration.
Heat kit staging configuration
changed 04 The dip switches on stage 1 kW do not match the stored information on the
control. Hold the pushbutton, with no calls to the control, for 6 s to 9 s, to clear
and set the new model.
Comm lost with HVAC system
master 0 5 Comm lost
The control is no longer communicating with the HVAC system. If the system is
conventional, cycle power. If the system is communication, ensure the main
thermostat is powered, check the wiring, and check the main thermostat for
faults.
Comm lost with motor 0 6 Motor connec-
tion lost
The control is no longer communicating with the ClimateTalk blower. Check the
wiring between the motor and the control, and check that the motor is getting
power.
Low voltage (<19 VAC) 0 7 Low voltage
error
The control is experiencing a low voltage condition. It continues with outputs
already engaged, but does not engage new outputs. Check for damaged wiring
and brown-out conditions.
Low voltage (<16 VAC) 0 8 The control is experiencing a very low voltage condition. The control no longer keeps outputs engaged and shuts down the system. Check for damaged wiring
and brown-out conditions. Lower voltage means the control does not turn on.
Leaving air temperature sensor
failure (open) 13
Leaving air
temperature
sensor error
The leaving air sensor is open. Check the wiring and check for a damaged sen-
sor.
Leaving air temperature sensor
failure (short) 14 The leaving air sensor is shorted. Check the wiring and check for a damaged
sensor.
Low leaving air temperature in
cooling 15
The leaving air temperature sensor is reporting lower temperatures that may
cause condensate in the ductwork and cause damage to equipment. A few dif-
ferent things could cause this:
1. Check for a blockage in the ductwork.
2. Verify that the airflow for the size of the outdoor unit is correct.
3. Verify that the outdoor unit is the correct size for the application.
4. Verify there is nothing obstructing the fan.
High leaving air temperature in
heating 16
The leaving air temperature sensor is reporting higher temperatures that may
cause damage to equipment. A few different things could cause this:
1. Check for a blockage in the ductwork.
2. Verify that the airflow for the size of the outdoor unit is correct.
3. Verify that the heat kit is the correct size for the application.
4. Verify there is nothing obstructing the fan.
High leaving air temperature in
heating (heat pump mode) 17
The leaving air temperature sensor is reporting higher temperatures that may
cause damage to equipment. A few different things could cause this:
1. Check for a blockage in the ductwork.
2. Verify that the airflow for the size of the outdoor unit is correct.
3. Verify that the outdoor unit is the correct size for the application.
4. Verify that the heat kit is the correct size for the application.
5. Verify there is nothing obstructing the fan.
Continued on next page

6146293-UIM-A-0522
14 Johnson Controls Ducted Systems
Float switch fault activated 1 8 Float switch
fault The float switch tripped. Check there is not excess water in the drain pan, the drain pan is not clogged, and the float switch is operating correctly.
Call for reversing valve while in
air conditioner mode 22
Incorrect
wiring
The control senses 24 VAC on the O terminal.
• If the outdoor unit is a non-HMH7 heat pump, make sure the AC/HP
switch is correctly set.
• If the outdoor unit is an Air Conditioner, check the wiring.
• If the outdoor unit is an HMH7 heat pump, ensure that the control is in S1
functionality. See the S1 Functionality section for more information.
Call for cooling and indoor heat-
ing at the same time 24
The control senses 24 VAC on the Y terminal and the W terminal while in air
conditioner mode.
• If the outdoor unit is a non-HMH7 heat pump, change the AC/HP switch.
• If the outdoor unit is an air conditioner, check the wiring to the conven-
tional inputs.
• If the outdoor unit is an HMH7 heat pump, ensure that the control is in S1
functionality. See the S1 Functionality section for more information.
Call for reversing valve and heat-
ing at the same time 25
The control senses 24 VAC on the W terminal and the O terminal in heat pump
mode. Check the wiring to the conventional inputs.
• If the outdoor unit is an HMH7 heat pump, ensure that the control is in S1
functionality. See the S1 Functionality section for more information.
Fan running without a call 3 0
Fan faults
The control senses the motor is moving without command.
1. Check the wiring between the motor and the control.
2. Cycle power on both the motor and the control.
3. Verify there is nothing moving the blower besides the motor attached to
this air handler control.
Fan failure 3 1
The control senses the motor is not moving with an active demand.
1. Check the motor has sufficient power.
2. Check the wiring between the motor and the control.
3. Verify nothing is blocking the blower fan.
4. Cycle power to both the motor and the control.
Fan - high voltage failure 3 2
The control senses the motor is receiving too high voltage.
1. Check the voltage going to the blower motor.
2. Check the wiring of power to the motor.
3. Cycle power to the motor and to the control.
4. Verify nothing is blocking the blower.
Fan - low voltage failure 3 3
The control senses the motor is receiving too low voltage.
1. Check the voltage going to the blower motor.
2. Check the wiring of power to the motor.
3. Cycle power to the motor and to the control.
Fan - high current failure 3 4
The control senses the motor is receiving too high current.
1. Check the power going to the blower motor.
2. Check the wiring of power to the motor.
3. Cycle power to the motor and to the control.
4. Verify nothing is blocking the blower.
Fan - low current failure 3 5
The control senses the motor is receiving too low current.
1. Check the power going to the blower motor.
2. Check the wiring of power to the motor.
3. Cycle power to the motor and to the control.
Fan - high temperature failure 3 6
The control senses the motor’s internal temperature is too high.
1. Verify the airflow set on the air handler control is correct for the air handler
model, heat kit, and staging.
2. Ensure nothing is blocking the blower.
3. Cycle power on the motor and the control.
Fan - low temperature failure 3 7
The control senses the motor’s internal temperature is too low.
1. Verify the airflow set on the air handler control is correct for the air handler
model, heat kit, and staging.
2. Ensure nothing is blocking the blower.
3. Cycle power on the motor and the control.
Continued on next page
Table 6: Fault list (continued)
Fault/status Display 1 Display 2 Simplified Description

6146293-UIM-A-0522
Johnson Controls Ducted Systems 15
HUM OUT output
The HUM OUT output drives an external relay or solenoid (24 VAC coil) to
control a humidifier. The output energizes when the control has a thermo-
stat call for heating (heat pump or electric heat).
Heat output
The control connects to the heater relays using pins three, four, and five of
connector P3. The relay outputs are 24 VAC.
The control energizes the heat relays as shown in Table 7.
Depending on the heatkit 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 ener-
gizes 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 ener-
gizes one heating element (HT2). With either configuration, the control
energizes two heating elements (HT1 and HT2) when it receives a first and
second stage heat input from the thermostat.
Heat kit outputs based on thermostat inputs can be configured differently if
required, using the stage 1 kW dip switches located in the SW3 switch
bank. With the switches in 00 (OFF, OFF) or 01 (OFF, ON), W1 input = HT1
output. If the switches are in the 10 (ON, OFF) position, W1 input = HT2
output. If the switches are in the 11 (ON, ON) position, W1 input = HT1 and
HT2 output. See Table 15 for switch settings.
Wiring related faults
If the control receives a simultaneous call for electric heating and cooling
(fault code 24), the control locks out and does not condition.
Section IX: Airflow and comfort setting
selection
Airflow selection
When not using communicating functionality, you must set the airflow and
comfort setting selection switches correctly at the time of installation for
correct system operation. Place switches in the correct locations based
on the information shown in Table 24. An example of switch positions is
shown below in Figure 21. 0 indicates the OFF position and 1 indicates
the ON position. The airflow configuration switches are located in the
SW4 switch bank.
Inputs to the air handler control board pass to the motor, which deter-
mines the target CFM to deliver. The following inputs produce the CFM
shown in the appropriate table and selected tap settings.
These variable speed air handlers are designed to deliver constant airflow
(CFM) regardless of the external static pressure (ESP) in the ductwork.
Therefore, if too many supply registers are closed, a filter becomes
clogged, or there is a restriction in the ductwork, the motor automatically
operates at a higher speed to compensate for the higher ESP. This may
result in a higher operating sound level and motor damage.
Setting cooling or heat pump heating airflow:
Refer to the outdoor unit Technical Guide for the appropriate airflow with
the matching indoor coil. See Table 24 for the possible high speed cooling
and heat pump heating airflow selections.
Find the appropriate system airflow in Table 24 for the installed air han-
dler model and outdoor unit. LOW COOL and HIGH COOL each have
three switch positions to set.
Set LOW COOL on switches 3, 4, and 5 on the SW4 switch bank. Set
HIGH COOL on switches 6, 7, and 8 on the SW4 switch bank. The control
is factory set for HP applications. For AC applications, change the AC/HP
dip switch located in the SW5 switch bank to the 1 (ON) position.
Fan - lost rotor 3 8
Fan faults
The control senses the motor has a lost rotor fault.
1. Ensure nothing is blocking the blower.
2. Cycle power on the motor and the control.
Fan - incomplete parameter 3 9
The control delivers incomplete data to the motor.
1. Check wiring between the control and the motor.
2. Check the EE plug is firmly seated into the control.
3. If the issue persists, cycle power to the control and the motor.
Fan - undesired parameter
change 40
1. The control delivers a parameter change at the wrong time to the motor.
Check wiring between the control and the motor.
2. Check the EE plug is firmly seated into the control.
3. If the issue persists, cycle power to the control and the motor.
Fan - fault limit lockout 4 1
The motor hits the fault limit and no longer runs.
1. Check the fault list on the control and troubleshoot those faults.
2. When these faults have been checked, cycle power to the motor and con-
trol.
Table 6: Fault list (continued)
Fault/status Display 1 Display 2 Simplified Description
Table 7: Heat relays
Input Heat Relay Output
W1 HT1
W2 HT2
W1 and W2 HT1 and HT2
Figure 21: DIP-10
NOTICE
Incorrect airflow and comfort settings may result in decreased system
efficiency and performance.
Figure 22: DIP-8
ON
DIP Switch example: 0101000110
12345678910
A1708-001
ON
DIP Switch example: 01010001
12345678
A1709-001

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16 Johnson Controls Ducted Systems
Setting continuous fan airflow:
The CONT FAN switches can be adjusted to increase airflow during a fan-
only call. See Table 8, which shows values as a percentage of maximum
airflow.
Setting electric heatkit airflow:
The blower speed required for first and second stage electric heat is dif-
ferent from cooling or heat pump heating. See Table 12 and Table 13 for
minimum required airflow based on the installed heat-kit accessory and its
switch positions. Each heat-kit selection has six different switch positions
to set.
The first two switch settings are switches 1 and 2, listed as HEAT in the
airflow configuration SW4 switch bank. The next four switch settings are
switches 3, 4, 5, and 6, listed as HEATKIT SELECTION in the aux heat
configuration SW3 switch bank. See Figure 23 for the location of these
switches.
Change the switch positions according to the unit model and accessory
heat kit installed, where 0 = OFF and 1 = ON.
Blower ramp-up/ramp-down:
To minimize the sound made by the blower when it speeds up or slows
down, the blower slowly ramps up or down from one speed to another.
Changes in blower speed during A/C or heat pump heating can take up to
30 s. Changes in blower speed during electric resistance heating can take
up to 15 s.
Comfort settings
Normal
The normal setting provides a ramp-up from zero airflow to full capacity
and a ramp-down from full capacity back to zero airflow.
Humid
The humid setting is best suited for installations where the humidity is fre-
quently very high during cooling season. On a call for cooling, the blower
ramps up to 50% of full capacity and stays there for 2 min, then ramps up
to 82% of full capacity and stays there for 5 min, and then ramps up to full
capacity, where it stays until the wall thermostat setpoint is reached.
Dry
The dry setting is best suited to locations where excessive humidity is not
generally a problem, where the summer months are usually dry. On a call
for cooling the motor ramps up to full capacity and stays there until the
thermostat setpoint is reached. At the end of the cooling cycle, the blower
ramps down to 50% of full capacity, where it stays for 60 s, then ramps
down to zero.
Temperate
The temperate setting is best suited for most locations, where neither
excessive humidity nor extremely dry conditions are the norm. On a call
for cooling, the motor ramps up to 63% of full capacity and stays there for
90 s, then ramps up to full capacity. At the end of the cooling cycle, the
motor ramps down to 63% of full capacity and stays there for 30 s, then
ramps down to zero.
Section X: Unit data
Table 8: Continuous fan switches
CONT FAN % of maximum airflow
00 40
01 60
10 80
11 100
Table 9: Comfort setting selection
Delay tap Comfort setting
A = 00 Normal
B = 01 Humid
C = 10 Dry
D = 11 Temperate
Table 9: Comfort setting selection
Table 10: Physical and electrical data - cooling only
Models 12B 16C 17C 20D
Blower - diameter x width (in.) 11 x 8 11 x 10 11 x 10 11 x 11
Motor HP 1/2 HP 3/4 HP 1 HP 1 HP
Nominal RPM 1050 1050 1050 1050
Voltage (V) 208/230 208/230 208/230 208/230
Full load amps at 230 V (A) 3.8 5.4 7.0 7.0
Filter1Type Disposable or cleanable
Size (in.) 16 x 20 x 1 20 x 20 x 1 20 x 20 x 1 23 x 20 x 1
Bottom rack kit 1BR01117 1BR01121 1BR01121 1BR01124
Shipping / operating weight (lb) 57/56 63/62 166/65 70/69
1. Field supplied
Table 11: Electrical data - cooling only
Models Motor FLA1Minimum circuit ampacity (A) MOP2
12B 3.8 4.8 15
16C 5.4 6.8 15
17C/20D 7.0 8.8 15
1. FLA = Full Load Amps
2. MOP = Maximum Overcurrent Protection device; must be HACR type circuit breaker or time delay fuse. Refer to the latest edition of the National Electric Code or in Canada the
Canadian electrical Code and local codes to determine correct wire sizing.

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Johnson Controls Ducted Systems 17
Figure 23: Variable speed board dip switch locations - heat kit
A1731-001
Airflow configuration
Heatkit selection
Table 12: Electrical heat: minimum fan CFM DIP switch settings for single-phase heat kits
Heater kit
models1,2 Nominal
kW
at 240 V
Air handler models
12B 16C 17C 20D
Indoor coil match
XAF XAH XAF XAH XAF XAH XAF XAH
8HK(0,1)6500206 2.4 00-0001 00-0001 00-0001 00-0001 00-0001 00-0001 00-0001 00-0001
8HK(0,1)6500506 4.8 00-0010 01-0010 00-0010 00-0010 00-0010 00-0010 00-0010 00-0010
8HK(0,1)6500806 7.7 00-0011 01-0011 00-0011 00-0011 00-0011 00-0011 00-0011 00-0011
8HK(0,1)6501006 9.6 00-0100 00-0101 00-0100 00-0100 00-0100 00-0100 00-0100 00-0100
8HK(1,2)6501506 14.4 00-0101 01-0101 00-0101 00-0101 01-0101 01-0101 00-0101 01-0101
8HK(1,2)6502006 19.2 00-0110 00-0110 01-0110 01-0110** 00-0110 00-0110 00-0110 00-0110
8HK(1,2)6502506 24 — — — — — — 00-0111 00-0111
1.(0,1) - 0 = no service disconnect or 1 = with service disconnect.
2.(1,2) - 1 = with service disconnect, no breaker jumper bar or 2 = with service disconnect and breaker jumper bar.
Note: The values in the table are represented as two digits followed by four digits. The first two digits represent the airflow configuration - heat DIP
switch settings. The last four digits represent the aux heat configuration - heat kit selection DIP switch settings.
Table 13: Electrical heat: minimum fan CFM for three-phase heat kits
Heater kit
models1,2
Nominal
kW
at 240 V
Airflow
configuration
heat dip
switch
setting*
Aux heat
configuration
heat kit
selection dip
switch setting
Air handler models (CFM3)
12B 16C 17C 20D
Indoor coil match
XAF XAH XAF XAH XAF XAH XAF XAH
8HK06501025 9.6 00 1000 00-1000 00-1000 00-1000 00-1000 00-1000 00-1000 00-1000 00-1000
8HK06501525 14.4 00 1001 00-1001 01-1001 00-1001 01-1001 01-1001 01-1001 00-1001 00-1001
8HK16502025 19.2 00 1010 00-1010 00-1010 01-1010 01-1010 00-1010 00-1010 00-1010 00-1010
8HK16502525 24 00 1011 — — — — — — 00-1011 00-1011
1.(0,1) - 0 = no service disconnect or 1 = with service disconnect.
2.(1,2) - 1 = with service disconnect, no breaker jumper bar or 2 = with service disconnect and breaker jumper bar.
3.For minimum fan CFM, if there are two values present, the first value is low-stage CFM (W1) and the second value is full-stage CFM (W1+W2). If higher kW/CFM is
needed for low-stage, see Table 15 and the heat output section of this manual.
* To increase airflow by approximately 20%, adjust the HEAT switches 1 and 2, located in the airflow configuration SW4 switch bank, from 00 to 01.
Table 14: Electrical heat only: default fan speeds for FER compliance
Models High sales volume
heat kit models1,2,3 Nominal kW
at 240 V Default blower speeds
W1/[W1+W2] Heat Max air flow Continuous fan
12B 8HK(0,1)6500806 7.7 kW W1 01-0011 111 (High) 01
16C 8HK(1,2)6501506 14.4 kW W1+W2 01-0100 111 (High) 01
17C 8HK(1,2)6501506 14.4 kW W1+W2 01-0110 111 (High) 01
20D 8HK(1,2)6501506 14.4 kW W1+W2 00-0101 111 (High) 01
1.(0,1) - 0 = no service disconnect or 1 = with service disconnect.
2.(1,2) - 1 = with service disconnect, no breaker jumper bar or 2 = with service disconnect and breaker jumper bar.
3.For 16C, 17C, and 20D models with 15 kW (8HK*65015**) heat kit, connect the AHU W1 and W2 thermostat inputs together for FER compliance.

6146293-UIM-A-0522
18 Johnson Controls Ducted Systems
Table 15: Aux heat configuration - stage 1 kW dip switch settings
W1 = W1 00, 01
W1 = W2 10
W1 = W1+W2 11
Table 16: Application factors - rated CFM versus actual CFM
% of rated airflow (CFM) 80 90 100 110 120
Capacity factor 0.96 0.98 1.00 1.02 1.03
Table 17: kW and MBH conversions - for total power input requirement
For a power distribution voltage that is different from the provided nominal voltage, multiply the kW and MBH data from Table 18 by the conversion
factor in the following table.
Distribution power (V) Nominal voltage (V) Conversion factor
208 240 0.75
220 240 0.84
230 240 0.92
Table 18: Electric heat performance data: 208/230-1-60 and 208/230-3-60
Heater
models1,2 Nominal kW
at 240 V
Total heat 3kW staging
kW MBH W1 only W1 and W2
208 V 230 V 208 V 230 V 208 V 230 V 208 V 230 V
Single
phase
8HK(0,1)6500206 2.4 1.8 2.2 6.2 7.5 1.8 2.2 1.8 2.2
8HK(0,1)6500506 4.8 3.6 4.4 12.3 15 3.6 4.4 3.6 4.4
8HK(0,1)6500806 7.7 5.8 7.1 19.7 24.1 5.8 7.1 5.8 7.1
8HK(0,1)6501006 9.6 7.2 8.8 24.6 30.1 7.2 8.8 7.2 8.8
8HK(1,2)6501506 14.4 10.8 13.2 36.9 45.1 3.6 4.4 10.8 13.2
8HK(1,2)6502006 19.2 14.4 17.6 49.2 60.2 7.2 8.8 14.4 17.6
8HK(1,2)6502506 24 18 22 61.5 75.2 7.2 8.8 18 22
Three
phase
8HK06501025 9.6 7.2 8.8 24.6 30.1 7.2 8.8 7.2 8.8
8HK06501525 14.4 10.8 13.2 36.9 45.1 10.8 13.2 10.8 13.2
8HK16502025 19.2 14.4 17.6 49.2 60.2 7.2 8.8 14.4 17.6
8HK16502525 24 18 22 61.5 75.2 9 11 18 22
1.(0,1) - 0 = no service disconnect or 1 = with service disconnect.
2.(1,2) - 1 = with service disconnect, no breaker jumper bar or 2 = with service disconnect and breaker jumper bar.
3.For different power distributions, see Table 17.
Table 19: Electrical data for single source power supply: 208/230-1-60
Air handler models Heater models1,2 Heater
amps (A)
at 240 V
Field wiring
Minimum circuit ampacity (A) MOP3(A)
208 V 230 V 208 V 230 V
12B
8HK(0,1)6500206 10 15.6 16.7 20 20
8HK(0,1)6500506 20 26.4 28.7 30 30
8HK(0,1)6500806 32 39.6 43.3 40 45
8HK(0,1)6501006 40 48.0 52.6 50 60
8HK(1,2)6501506 60 69.7 76.5 70 80
8HK(1,2)6502006 80 91.3 100.4 100 110
16C
8HK(0,1)6500206 10 17.6 18.7 20 20
8HK(0,1)6500506 20 28.4 30.7 30 35
8HK(0,1)6500806 32 41.6 45.3 45 50
8HK(0,1)6501006 40 50.0 54.6 50 60
8HK(1,2)6501506 60 71.7 78.5 80 80
8HK(1,2)6502006 80 93.3 102.4 100 110
17C
8HK(0,1)6500206 10 19.6 20.7 20 25
8HK(0,1)6500506 20 30.4 32.7 35 35
8HK(0,1)6500806 32 43.6 47.3 45 50
8HK(0,1)6501006 40 52.0 56.6 60 60
8HK(1,2)6501506 60 73.7 80.5 80 90
8HK(1,2)6502006 80 95.3 104.4 100 110
Continued on next page

6146293-UIM-A-0522
Johnson Controls Ducted Systems 19
20D
8HK(0,1)6500206 10 19.6 20.7 20 25
8HK(0,1)6500506 20 30.4 32.7 35 35
8HK(0,1)6500806 32 43.6 47.3 45 50
8HK(0,1)6501006 40 52.0 56.6 60 60
8HK(1,2)6501506 60 73.7 80.5 80 90
8HK(1,2)6502006 80 95.3 104.4 100 110
8HK(1,2)6502506 100 116.9 128.3 125 150
1.(0,1) - 0 = no service disconnect or 1 = with service disconnect.
2.(1,2) - 1 = with service disconnect, no breaker jumper bar or 2 = with service disconnect and breaker jumper bar.
3.MOP = Maximum Overcurrent Protection device; must be HACR type circuit breaker or time delay fuse. Refer to the latest edition of the National Electric Code or in
Canada the Canadian electrical Code and local codes to determine correct wire sizing.
Table 19: Electrical data for single source power supply: 208/230-1-60 (continued)
Air handler models Heater models1,2 Heater amps (A)
at 240 V
Field wiring
Minimum circuit ampacity (A) MOP3(A)
208 V 230 V 208 V 230 V
Table 20: Electrical data for multi-source power supply: 208/230-1-60
Air
handlers
models
Heater
models1
Heater
amps (A)
at 240 V
Minimum circuit ampacity (A) MOP2(A)
208 V 230 V 208 V 230 V
Circuit Circuit
First2Second Third First2Second Third First2Second Third First2Second Third
12B 8HK16501506 60 26.2 43.5 — 28.4 48.1 — 30 45 — 30 50 —
8HK16502006 80 48.0 43.3 — 52.6 47.8 — 50 45 — 60 50 —
16C 8HK16501506 60 28.2 43.5 — 30.4 48.1 — 30 45 — 35 50 —
8HK16502006 80 50.0 43.3 — 54.6 47.8 — 50 45 — 60 50 —
17C 8HK16501506 60 30.2 43.5 — 32.4 48.1 — 35 45 — 35 50 —
8HK16502006 80 52.0 43.3 — 56.6 47.8 — 60 45 — 60 50 —
20D 8HK16501506 60 30.2 43.5 — 32.4 48.1 — 35 45 — 35 50 —
8HK16502006 80 52.0 43.3 — 56.6 47.8 — 60 45 — 60 50 —
8HK16502506 100 52.0 43.3 21.6 56.6 47.8 23.9 60 45 25 60 50 25
1.8HK1 = with service disconnect, no breaker jumper bar
2.MOP = Maximum Overcurrent Protection device; must be HACR type circuit breaker or time delay fuse. The first circuit includes blower motor amps. Refer to the lat-
est edition of the National Electric Code or in Canada the Canadian electrical Code and local codes to determine correct wire sizing.
Table 21: Electrical data for single source power supply: 208/230-3-60
Air handler models Heater models1Heater
amps (A)
at 240 V
Field wiring
Minimum circuit ampacity (A) MOP2 (A)
208 V 230 V 208 V 230 V
12B 8HK06501025 23.1 29.7 32.4 30 35
8HK06501525 34.6 42.2 46.2 45 50
8HK06502025 46.2 54.7 60.0 60 60
16C 8HK06501025 23.1 31.7 34.4 35 35
8HK06501525 34.6 44.2 48.2 45 50
8HK06502025 46.2 56.7 62.0 60 70
17C 8HK06501025 23.1 33.7 36.4 35 40
8HK06501525 34.6 46.2 50.2 50 60
8HK06502025 46.2 58.7 64.0 60 70
20D
8HK06501025 23.1 33.7 36.4 35 40
8HK06501525 34.6 46.2 50.2 50 60
8HK06502025 46.2 58.7 64.0 60 70
8HK06502525 57.7 71.2 77.8 80 80
1.The 20kW and 25kW heater models (8HK16502025 and 8HK16502525) come with circuit breakers standard. Single source power MCA and MOP requirements are
given here only for reference if used with field installed single point power modification.
2.MOP = Maximum overcurrent protection device; must be HACR type circuit breaker or time delay fuse. The first circuit includes blower motor amps. Refer to the lat-
est edition of the National Electric Code or in Canada the Canadian electrical Code and local codes to determine correct wire sizing.

6146293-UIM-A-0522
20 Johnson Controls Ducted Systems
Notes:
• Dry coil conditions only, tested without filters
• For optimal performance, external static pressures of 0.2 in. W.C. to 0.5 in. W.C. are recommended. Heating applications tested at 0.5 in. W.C. external static pres-
sure. Above 0.5 in. W.C., CFM is reduced by 2% per 0.1 in. increase in static.
• When operating in both heat pump and electric heat modes, the airflow (CFM) will be based on the heat tap CFM values only.
• At some settings, low cool and low heat airflow may be lower than what is required to operate an airflow switch on certain models of electronic air cleaners. Consult
the instructions for the electronic air cleaner for further details.
• Airflow (CFM) indicator light (LED2) flashes once for every 100 CFM (for example, 12 flashes is 1200 CFM) - blinks are approximate ±10% of actual CFM.
Notes:
• Air handler units have been tested to UL 60335-2-40/CSA 22.2 No. 236 standards up to 0.6 in. W.C. external static pressure.
• Dry coil conditions only, tested without filters
• For optimal performance, external static pressures of 0.2 in. W.C. to 0.5 in. W.C. are recommended. Heating applications tested at 0.5 in. W.C. external static pres-
sure. Above 0.5 in. W.C., CFM is reduced by 2% per 0.1 in. increase in static.
• Low speed cooling used only with two stage outdoor units. Speed is preset to 65% of high speed.
• Dehumidification speed is 85% of jumper selected cool tap and adjust tap.
• When operating in both heat pump and electric heat modes, the airflow (CFM) will be based on the heat tap CFM values only.
• At some settings, low cool and low heat airflow may be lower than what is required to operate an airflow switch on certain models of electronic air cleaners. Consult
the instructions for the electronic air cleaner for further details.
• Airflow (CFM) indicator light (LED2) flashes once for every 100 CFM (for example, 12 flashes is 1200 CFM) - blinks are approximate ±10% of actual CFM.
Table 22: Electrical data for multi-source power supply: 208/230-3-60
Air handlers
models Heater
models1Heater amps (A)
at 240V
Minimum circuit ampacity (A) MOP2(A)
208V 230V 208V 230V
Circuit Circuit
First2Second First2Second First2Second First2Second
12B 8HK16502025 46.2 29.7 25.0 32.4 27.6 30 25 35 30
16C 8HK16502025 46.2 31.7 25.0 34.4 27.6 35 25 35 30
17C 8HK16502025 46.2 33.7 25.0 36.4 27.6 35 25 40 30
20D 8HK16502025 46.2 33.7 25.0 36.4 27.6 35 25 40 30
8HK16502525 57.7 40.0 31.2 43.3 34.5 40 35 45 35
1.The 20kW and 25kW heater models (8HK06502025 and 8HK06502525) come with service disconnects standard.
2.MOP = Maximum overcurrent protection device; must be HACR type circuit breaker or time delay fuse. The first circuit includes blower motor amps. Refer to the lat-
est edition of the National Electric Code or in Canada the Canadian electrical Code and local codes to determine correct wire sizing.
Table 23: Aux heat configuration - heat kit selection
DIP switch setting High/low speed heat CFM 12B 16C 17C 20D
High Low High Low High Low High Low
0001 625 625 825 825 825 825 825 825
0010 650 650 825 825 825 825 825 825
0011 750 750 1100 1100 1100 1100 1150 1150
0100 750 750 1100 1100 1100 1100 1500 1500
0101 975 650 1100 825 1100 825 1700 825
0110 975 750 1300 1100 1300 1100 1700 1500
0111 — — — — — — 1800 1500
Table 24: Airflow data (CFM)
DIP switch setting High/low speed cooling and heat pump CFM 12B 16C 17C 20D
High Low High Low High Low High Low
000 800 550 1100 700 1150 725 1500 925
001 900 600 1200 750 1250 775 1475 1050
010 975 650 1300 800 1350 850 1750 1125
011 1075 700 1400 850 1450 900 1875 1225
100 1150 775 1500 925 1575 975 2000 1350
101 1250 825 1625 975 1675 1025 2000 1400
110 1325 900 1725 1050 1775 1100 2000 1475
111 1400 950 1825 1100 1875 1150 2000 1575