Suntherm MS Series Guide

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USERS INFORMATION MANUAL
MULTI-POSITION, UPFLOW, AND HORIZONTAL DX AND CHILLED For Installation In:
WATER COOLING WITH ELECTRIC OR HOT WATER HEATING 1. Modular Homes & Buildings
MODELS: MS, MM, US, UM SERIES 2. Residential Homes
LIST OF SECTIONS – USERS INFORMATION MANUAL
1 – General 1 4 – Start Up & Shutdown Instructions 5
2 – Safety 2 5 – Owner Maintenance 5
3 – Owners Information & Seasonal Information 3
LIST OF SECTIONS – SERVICE AND MAINTENANCE MANUAL
1 – Safety 8 6 – Blower Performance 16
2 – Air Handler Maintenance 9 7 – ECM 2.3 Climate Profiles 20
3 – Air Handler Controls 10 8 – Accessories Parts 21
4 – Sequence of Operation 10 9 – Replacement Parts 22
5 - – Trouble Shooting 13
LIST OF FIGURES
1 – Air Handler Examination Check Points 4 15 – ECM Motor Control Pin Out 14
2 – Front Access Panel Circuit Breaker Locations 5 16 – Adjustable Time Delay Relay (TDR) Terminals 14
3 – Home Owner / Users Cleaning Points 6 17 – X-13 Motor Terminals 14
4 – Accessory Air Filter Box – Upflow 6 18 – Heater Relay Terminal Designations 15
5 – Accessory Air Filter Box – Air Filter Access - Upflow 6 19 – Blower Mounting Plate and Screw Locations 15
6 – Accessory Filter Box – Adjustment for 1” and 2” Filters 6 20 – ECM Control Board Diagram 19
7 – Downflow / Horizontal Filter Location – Wall or Ceiling 7 ECM Climate Profiles figure 1 and figure 2 20
8 – No Electric Heat Control Box 9 21 – MS 18-24 Electric Heat Replacement Parts Drawing 22
9 – Hydronic Heat Control Box 9 22 – MS 25-30-36 Electric Heat Replacement Parts Drawing 23
10 – Electric Heat Control Box 9 23 – MS 37-42-48-60-72 Electric Heat Replacement Parts Drawing 24
11 – Blower Assembly and Mounting Screw Location 9 24 – MS 18-24 Hydronic Heat Replacement Parts Drawing 25
12 – Component Locations – Electric Heat Models 11 25 – MS 25-30-36 Hydronic Heat Replacement Parts Drawing 26
13 – Component Locations – Hydronic Heat Models 11 26 – MS 37-42-48-60-72 Hydronic Heat Replacement Parts Drawing 27
14 – Motor Speed Tap Isolation Relay - X-13 and PSC Motors 13
LIST OF TABLES
1 – X-13 Motor Terminal Connections 15 10 – Blower CFM - Heat & Cool Jumper Pin Taps ECM Cntrl Board 19
2 – 208 / 240 VAC Blower Motor Current Chart 15 11 – MSVE, MSVT, MSPS Accessory Parts List 21
3 – 120 VAC Blower Motor Current Chart 15 12 – MS 18-24 Electric Heat Replacement Parts List 22
4 – MSVE Blower Performance - ECM 2.3 Motor 16 13 – MS 25-30-36 Electric Heat Replacement Parts List 23
5 – MSVE Blower Amp Data - ECM 2.3 Motor 16 14 – MS 37-42-48-60-72 Electric Heat Replacement Parts List 24
6 – MSVT Blower Performance – X-13 Motor 17 15 – MS 18-24 Hydronic Heat Replacement Parts List 25
7 – MSVT Blower Amp Data – X-13 Motor 17 16 – MS 25-30-36 Hydronic Heat Replacement Parts List 26
8 – MSPS Blower Performance – PSC Motor 18 17 – MS 37-42-48-60-72 Hydronic Heat Replacement Parts List 27
9 – MSPS Blower Amp Data – PSC Motor 18
CONTACT INFORMATION
Contact us by mail: Manufactured and Distributed by Mortex Products Inc.
501 Terminal Rd www.mortx.com
Fort Worth, TX 76106
SECTION I: GENERAL
The following list includes important facts and information regarding
the air handler and its inclusions.
1. Air Handler is rated at 240 volts AC at 60 Hertz for electric
heat models or 120 volts AC at 60 Hertz for hydronic models.
2. Air Handler is available in a small, medium, or large cabinet
size.
3. All air handlers are equipped with a blower for A/C or Heat
Pump operation.
4. Multi-position models are designed for upflow, downflow and
horizontal application. All other models are designed for
upflow and horizontal application.
5. This air handler must not be operated without the doors
installed.
NOTE: This air handler and its components are listed as a
combination AC or Heat Pump system by ETL for sale in the United
States and Canada.
USERS MUST READ ALL INSTRUCTIONS IN THIS MANUAL AND
THIS MANUAL MUST BE SAVED FOR FUTURE REFERENCE
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.
Do not store or use gasoline or other flammable vapors and
li id i h i i i f hi h li

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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: indicated 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
property damage.
SAFETY REQUIREMENTS
1. This air handler must be kept clear and free of
combustible materials, gasoline and other flammable
vapors and liquids.
2. Insulating materials may be combustible. The air handler
must be kept free and clear of insulating materials. The air
handler area must be examined when installed in an
insulated space or when insulation is added to be sure that
the insulation material has been kept away from the
appliance.
3. Follow the instructions exactly as shown in Startup and
Shutdown Section in this manual to properly Startup or
Shutdown this appliance.
4. If overheating occurs, turn off the power to the appliance
and contact a qualified contractor, installer, or service
agency.
5. NEVER - Store flammable materials of any kind near
your appliance. Gasoline, solvents and other volatile
liquids should be stored only in approved containers
outside the home. These materials vaporize easily and are
extremely dangerous.
6. NEVER – Store cleaning materials such as bleaches,
detergents, powder cleaners, etc. near the appliance.
These chemicals can cause corrosion of the air handler
sheet metal and the electric heaters, the blower and the
electrical controls.
7. NEVER – Use the area around the appliance as a storage
area for items which could block or obstruct the normal
air flow to the air handler or the space around the
appliance. The flow of air is required for safe and proper
operation. Never block or obstruct air openings used for
ventilation and cooling of the air handler electrical
components.
8. Refer to the appliance rating plate for the air handler
model number, for the operating specifications for safe
operation.
9. Provide clearances for servicing ensuring service access is
allowed for the control box, electric elements and the
blower.
10.Failure to carefully read and follow all instructions in this
manual can result in malfunction of the air handler, death,
personal injury, and/or property damage.
11.If the air handler is installed in a residential garage it must
be installed so that the electric heaters are located not less
than 18 inches above the floor and the air handler must be
Any adjustment, service or maintenance by the home owner
and/or user may create a condition where the operation of
the product could cause personal injury or property damage.
Only qualified service personnel, a contractor, or an installer
may refer to the service and maintenance section of this
manual for assistance or for additional information on this
appliance.
This product requires periodic routine maintenance and
cleaning of the exterior surfaces by the homeowner or user
to remove dust and debris. Any additional service must be
performed by qualified personnel. This appliance must be
serviced and maintained as specified in these instructions
and/or to 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.
Do not use this appliance if any part has been under water.
A flood damaged furnace is extremely dangerous.
Attempts to use the air handler can result in a fire.
A qualified contractor, installer, or service agency must be
contacted to inspect the air handler for any water damage
and replace all components, control system parts, or
electrical parts that have been damaged. If enough damage
is present, the air handler
may need to be replaced

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located or protected to avoid physical damage by
vehicles.
12.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 modular home and residential home
construction practices. These instructions are to be
followed and are the minimum requirement to perform
service or repairs on this appliance.
SECTION III: OWNERS INFORMATION
AND SEASONAL INFORMATION
How The Air Handler Works – Heating Cycle
The appliance is equipped with the controls necessary for
proper and safe operation. Circuit breaker location is shown in
Figure 1.
The air handler is equipped with a relay(s), time delay relay,
transformer, circuit breakers (Electric Heat Models Only), and
a blower assembly. The transformer provides 24 VAC to the
thermostat.
When the thermostat calls for heat on the electric heat models,
the relay(s) energize sending 240 VAC thru the limit switches
to the electric heaters causing them to get hot. The indoor fan
motor is then energized on the selected heating speed tap after
an “ON” time delay and the circulating blower draws cool air
from the living space(s), passes it across the heater coils and
circulates the warmed air through the duct work to the living
space(s). When the thermostat is satisfied the electric heaters
are de-energized. The blower is also de-energized after an
“OFF” time delay and the heating cycle has ended and the air
handler is ready for the next call for heat to start the next
cycle.
When the thermostat calls for heat on the hydronic heating
models a pump relay will be energized causing the flow of hot
water thru the hot water coil, heating the coil. The indoor fan
motor is energized on the heating speed tap after an ”ON”
time delay. The circulating blower then draws cool air from
the living space(s), passes it across the hot water coil and
circulates the warmed air through the duct work to the living
space(s). When the thermostat is satisfied the circulating pump
is de-energized. The blower is also de-energized after an
“OFF” time delay, the heating cycle has ended and the air
handler is ready for the next call for heat to start the next
cycle.
How The Air Handler Works – Cooling Cycle
When the thermostat calls for cooling, 24 VAC is sent to the
compressor contactor causing it to close energizing the
compressor and the outdoor fan motor. The indoor fan motor
is then energized on the selected cooling speed tap after an
“ON” time delay and the circulating blower draws air from the
living space(s), passes it across the cooling coil in the air
handler and circulates the cooled air through the duct work to
the living space(s). When the thermostat is satisfied the
compressor contactor is de-energized turning off the
compressor and the outdoor fan motor. The blower is also de-
energized after an “OFF” time delay and the cooling cycle has
ended and the air handler is ready for the next call for cooling
to start the next cycle.
When the thermostat calls for heat pump, 24 VAC is sent to
the compressor contactor causing it to close energizing the
compressor and the outdoor fan motor. The reversing valve is
energized causing the flow of the refrigerant to reverse and
heat the coil inside the air handler. The indoor fan motor is
then energized on the selected heat pump speed tap after an
“ON” time delay and the circulating blower draws air from the
living space(s), passes it across the coil in the air handler and
circulates the warmed air through the duct work to the living
space(s). When the thermostat is satisfied the compressor
contactor is de-energized turning off the compressor and the
outdoor fan motor. The blower is also de-energized after an
“OFF” time delay and the heat pump cycle has ended and the
air handler is ready for the next call for heat pump to start the
next cycle.
Examination of the air handler
The home owner should perform a visual examine the furnace
every month for any defects or problems. The items to be
inspected are:
1. The physical support of the furnace is sound without
sagging cracks, gaps, etc. around the base so as to provide
a seal between the support and the base.
2. The furnace casing for any obvious signs of deterioration
from rust or corrosion.
3. The return and supply duct connections are physically
sound and are sealed to the furnace casing.
4. The furnace must be serviced by qualified personnel
annually, preferably at the start of each heating season.
FIRE OR ELECTRICAL HAZARD
Servicing heating/cooling equipment can be hazardous due
to electrical components.
Only trained and qualified personnel can service or repair
heating/cooling equipment. The home owner must never try
to perform service, repair or maintenance on this appliance.
Untrained service personnel can perform only basic
maintenance functions such as cleaning of exterior
surfaces and replacing the air filters.
Observe all precautions in the manuals and on the attached
labels when working on this appliance

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Figure 1: Air Handler Visual Check Points
The Service Technician
The air handler’s best friend is a qualified service technician.
If the appliance gives any indication of improper operation,
call the service technician. The service technician is allowed
to perform the normal routine care of your appliance. He can
detect potential problems and make corrections before trouble
develops. Preventative maintenance of this type will allow the
air handler to operate with minimal concerns to the
homeowner and will add years of comfort.
Warranty and Responsibilities
It is the sole responsibility of the homeowner to make certain
the furnace has been properly installed and adjusted to operate
properly.
The manufacturer warrants the appliance to be free from
defects in material or workmanship for a stated time in the
warranty agreement. The manufacturer will not be responsible
for any repair costs to correct problems due to improper setup,
improper installation, improper furnace adjustments, installing
parts or components on the appliance that are not listed for use
with this appliance, improper operating procedures by the user
or repairs performed by the appliance user or owner.
Some specific examples of service calls which will be
excluded from warranty reimbursement are:
1. Correcting faulty duct work in the home. This can be due
to not enough ducts or ducts are too small to provide
proper air flow through the air handler.
2. Correcting electrical wiring problems in the supply wiring
to the air handler.
3. Resetting circuit breakers or on/off switches used for
servicing.
4. Problems caused by installation and operation of any air
conditioning unit, heat pump, or other air quality devise
which is not approved for use with this air handler.
5. Adjusting or calibrating the thermostat.
6. Problems caused by construction debris which has fallen
into the air handler.
7. Replacement of fuses.
8. Problems caused by dirty air filters.
9. Problems caused by restrictions in the return or supply air
flow causing low air flow.
The home owner should establish a firm understanding of
these responsibilities with the installer or Service Company so
there will be no misunderstanding of what will be covered
under warranty at a later date.
While you are away
The air handler is equipped with safety shutoff devices which
are designed to prevent the appliance from overheating in case
of a malfunction. For this reason it is never practical to assume
the appliance will operate unattended for a long period of
time. An example of a malfunction that can cause significant
damage to the home would be:
If the blower motor fails the heaters will cycle on the safety
shutoff devices while the temperature inside your home
continues to drop. All of the water pipes will freeze once the
temperature falls below 32°F.
If you are planning to be away from home for a long period of
time, have someone check on your home everyday, especially
when the outside temperatures will be below 35°F to ensure
the air handler is operating properly. This may prevent water
pipes from freezing.
The Furnace Fails to Operate Properly
If any abnormalities are observed while the furnace is
operating normally, perform the following checks:
1. Check the setting on the thermostat to make sure the
thermostat is set above the room temperature.
2. Check to see if the electrical power is turned on at the
circuit breakers at the main service circuit breaker box or
check any on/off switches that may be used for service
disconnect switches.
3. Check any inline fuses that may have been installed on
the air handler to determine if it has blown.
4. Make sure the air filters are clean, return grilles clean, are
not obstructed, and supply air registers are open.
If the cause of the malfunction is not obvious do not attempt to
service the appliance yourself. Call a qualified service
agency/company to repair the appliance.

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Figure2: Front Access Panel Circuit Breaker Locations
When to Call For Service Assistance
Very often time can be saved if you give a service agency the
information about the air handler ahead of time. This will
enable the service agency to determine the specific
components used and possibly indentify the problem, thus
arriving with the parts to fix the problem. Write down the
model number, Serial Number and be prepared to describe
what the air handler is or is not doing and what you have
checked prior to calling.
SERVICE AGENCY INFORMATION
Fill in Below
MODEL NUMBER:
SERIAL NUMBER:
SERVICE COMPANY:
ADDRESS:
TELEPHONE (DAYTIME):
TELEPHONE (EMERGENCY)
NOTES:
SECTION IV: STARTUP AND SHUTDOWN
INSTRUCTIONS
Read the instructions below before trying to start the
appliance.
A. BEFORE OPERATING; check around perimeter of the
furnace to make sure there are no flammable materials in
the area. If you smell vapors of any kind, DO NOT turn
on the power to the appliance until vapors have been
ventilated and removed from the area of the appliance.
B. CHECK THE FURNACE; visually check the appliance
for loose screws and/or panels that may be missing or
have fallen off.
C. CHECK DUCT CONNECTIONS; visually check the
connections of the ducts to the appliance to make sure
there are no gaps or holes and ducts are securely fastened
to the furnace.
Turn On / Start the Appliance
1. STOP! Read the safety information above before
proceeding.
2. Set the thermostat to the lowest setting.
3. Turn off all electrical power to the appliance at the main
service disconnect box.
4. Remove the upper and lower access door.
5. Turn off the circuit breakers on the appliance control box.
6. Remove the control box cover.
7. Visually check the control box for loose wire connections
and faulty or loose components.
8. Visually check the blower compartment for obstructions
or loose debris.
9. Replace the control box cover.
10. Turn the circuit breakers to the on position.
11. Replace the upper and lower access door.
12. Turn the circuit breakers in the main service disconnect
box to the on position.
13. Set the thermostat to the desired setting.
Shutting Down or Turning Off the Appliance
1. Set the thermostat to the lowest setting.
2. Turn off all electrical power to the appliance at the main
service disconnect box.
3. Remove the upper access door.
4. Turn off the circuit breakers on the appliance control box.
5. Replace the upper access door.
SECTION V: OWNER MAINTENANCE
All appliances need annual maintenance in order to operate
properly. The annual service must be preformed by qualified
service personnel. The homeowner is expected to perform
general cleaning of the exterior surfaces and replacement of
the air filters. Air filters must be checked every month and
replaced as needed. Figures 2 and 3 indicate the location of the
air filters.
AIR HANDLERS WITH ELECTRIC HEATERS
Should overheating occur turn the circuit breakers on the
control box and the main electrical service entrance (Circuit
Breaker Box) to the off position. Call qualified service
personnel to troubleshoot and repair the appliance. DO NOT
allow the air handler to continue to cycle on the limits.
If you do not follow these instructions exactly, a fire may
result causing property damage, personal injury, and/or loss
of life.

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Figure 3: Home Owner / Users Cleaning Points
Upflow Air Filter Replacement – Accessory Filter Box Kit
Follow these easy steps to replace the air filters.
1. Follow the procedure “To Turn Off the Appliance” in
the Startup and Shutdown Instructions section of these
instructions.
2. Remove the white handled thumb screws on the front of
the accessory filter box kit located at the return air end of
the appliance.
3. Let the top of the door fall towards you then push down
towards the floor.
4. Remove the air filter. The air filter is a disposable filter.
DO NOT attempt to clean the filter and reuse it.
5. Check the size of the air filter that was removed to make
sure it is replaced with a filter that is the same size.
6. Clean any access dirt or debris around the front area
where the air filter is located. Be careful not to use any
small vacuum cleaner parts or any small brushes to clean
inside the filter box, around the filter track. These parts or
brushes can fall off or drop into the return duct causing a
restriction of the return air flow.
7. Slide the air filter into the filter rack, push the door closed
and tighten the thumb screw.
8. Follow the “Turn On / Start the Appliance” in the
Startup and Shutdown Instructions section of these
instructions.
NOTE: Make sure the flow arrows on the air filter are pointing
towards the coil.
Accessory filter box kit can be used on the return air end of
the air handler when configured in the downflow position in
place of a wall, door or ceiling mounted return filter grille.
Figure 4: Accessory Air Filter Box
NOTE: Make sure the flow arrow on the air filter is pointing
towards the coil.
Figure 5: Accessory Air Filter Box – Air Filter Location
Figure 6: Accessory Air Filter Box – 1” or 2” Air Filter
Adjustment knob. A knob is on both sides.

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Downflow / Horizontal Air Filter Replacement
Appliances that are installed in a downflow or horizontal
position generally have the filters in filter grilles located in the
ceiling or the wall next to the ceiling. Follow these easy steps
to replace the air filters.
1. Follow the procedure “To Turn Off the Appliance” in
the Startup and Shutdown Instructions section of these
instructions.
2. Remove the white handled thumb screw on the front of
the filter grille or pull down on the latches on each side of
the grille door to release the door from the grille
assembly.
9. Let the grille door fall towards you, then, just let it hang.
10. Remove the air filter. If the air filter is a disposable filter
DO NOT attempt to clean the filter and reuse it.
11. Check the size of the air filter that was removed to make
sure it is replaced with a filter that is the same size.
12. Clean any dust or debris from both sides for the louvers
and around the area where the filter is placed before the
new air filter are installed.
13. Place the new air filter back into the grille assembly, push
the grille door closed and tighten the thumb screw or push
the latches in on each side of the door until the door is
securely fastened to the grille assembly.
14. Follow the “Turn On / Start the Appliance” in the
Startup and Shutdown Instructions section of these
instructions.
NOTE: Make sure the flow arrows on the air filter are pointing
away from the grille door.
Figure 7: Downflow / Horizontal Air Filter Location –
Wall or Ceiling
Pull tabs to open and remove air filte
r

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SERVICE AND MAINTENANCE MANUAL
SECTION I: SAFETY
THE HOME OWNERS AND / OR APPLIANCE USERS
MUST STOP HERE!
This section has been designed to assist a qualified service
agency in performing service and maintenance on this
appliance.
The homeowners and/or the appliance user must never
attempt to perform any service or maintenance on the
appliance especially when it involves the removal or
adjustment of any parts and/or components.
The following safety rules must be followed when servicing
this furnace.
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: indicated 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
property damage.
SAFETY REQUIREMENTS
1. The air handlers with electric heaters may have a dual
electrical supply circuit. Make sure you check each
electrical circuit with a meter to be sure the power has
been disconnected.
2. Insulating materials may be combustible. The air handler
must be kept free and clear of insulating materials.
3. Follow the instructions exactly as shown in Startup and
Shutdown Section in this manual to properly Startup or
Shutdown this appliance.
4. Make sure all moving parts have come to a complete stop
before attempting to perform any work once the appliance
door has been removed. Moving parts can cause serious
injury if clothing or body parts get caught in the moving
part.
The manufacturer or distributer will not be responsible for
any repairs due to removal of parts or improper parts
changes, improper maintenance, improper adjustments or
improper modifications to this air handler that were
performed by the homeowner and/or the appliance user.
The manufacturer will not be responsible if the homeowner
and/or appliance user use this section of the instructions in
an attempt to perform maintenance or repairs to the furnace.
This practice is very dangerous and may result in a fire
causing property damage, personal injury, loss of life and/or
will void the appliance warranty.
Improper adjustment, service or maintenance may create a
condition where the operation of the product could cause
personal injury or property damage.
Refer to this manual for assistance or for additional
information consult the Technical Support Group.
This product must be serviced and maintained as specified
in these instructions and/or to 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
dama
g
e,
p
ersonal in
j
ur
y
or loss of life.
ELECTRICAL SHOCK, FIRE HAZARD
Failure to follow the safety warnings exactly or
improper servicing could result in dangerous operation,
serious injury, property damage, and/or death.
Before servicing, disconnect all electrical power to the
appliance. Make sure you disconnect both power
supplies if the appliance has a dual power supply
circuit. Dual circuits may be used on the 15kW and
20kW models.
When servicing controls, label all wires prior to
disconnecting to aid in proper reconnection of wires.
Verify proper operation after servicing by turning the
thermostat above the room temperature for a brief
period of time to ensure proper appliance operation

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SECTION II: AIR HANDLER
MAINTENANCE
The interior sections of the air handler must be cleaned and
adjusted by a qualified service contractor once a year or before
the start of each heating or cooling season. The following
items must be checked:
1. The blower wheel and motor for excessive dirt.
2. The electric heaters for wear, damage or corrosion.
3. The electrical components for excessive dust, dirt, wear,
or deterioration.
4. The supply air duct system for excessive dust, dirt or
debris
5. The return air duct system for excessive dust, dirt or
debris
6. All electrical wiring for wear, insulation cracks and/or
damage.
7. Check the air conditioning evaporator coil for dust, debris
or damage.
8. Check the evaporator coil drain pan for proper drainage to
prevent water backup into the unit.
9. The air handler casing and all interior sheet metal panels
or dividers.
Air Handler Cleaning Procedure
1. Follow the instructions exactly as shown in Startup and
Shutdown Section in this manual to properly shutdown
this appliance.
2. Remove the upper access door on the front of the air
handler.
3. Remove the lower access door on the front of the
evaporator coil compartment.
4. ECM or X-13 Motors - Unplug the wire harnesses from
the blower motor.
PSC Motor – Unplug the wires from the 6 pin plug at the
bottom of the control box.
5. Remove the two screws on the left and right side and the
center screw on the bracket in front of the blower
mounting plate and slide the blower out. Refer to Figure
8.
6. Place a piece of cardboard on top of the evaporator coil to
prevent dirt or debris from falling onto the coil. Use a
vacuum cleaner and a small brush to remove any dirt and
debris from the blower and evaporator coil compartments.
7. Check the evaporator condensate drain pan for any debris
and ensure the pan is properly draining by pouring water
into the drain to check it.
8. Remove any excess water that may have spilled from
checking the evaporator condensate drain.
9. Check in the area above the blower compartment where
the heater elements are located and remove any dust, dirt
or debris from around the heater elements. Be careful not
to damage the heater elements with the vacuum hose or
the brush.
Figure 8: No Electric Heat Control Box
Figure 9: Hydronic Heat Control Box – No Pump
Figure 10: Electric Heat Control Box
Figure 11: Blower Assembly and Mounting Screw
Location
FIRE HAZARD
NEVER PLACE A JUMPER BETWEEN “R” & “W”
Placing jumper wire between the RED and WHITE
thermostat wires at the air handler in order to override the
thermostat and energize the heater elements is an extremely
dangerous practice that can result in damage to the
thermostat, dangerous operation, serious injury, property
damage and/or death.

MORTEXPRODUCTSINCFORTWORTH,TX76106Page10
10. Check the blower wheel for dust and debris. Use the
brush and the vacuum cleaner to remove any dust or
debris from the wheel. Be careful not the move or
accidentally remove the blower wheel balance weight
located on the wheel blade. If it is moved or removed it
will cause the blower wheel to vibrate. If the wheel is
vibrating, you must replace it.
11. Check the blower motor for dust and debris. Be sure to
clean the openings on the motor housing as these
openings are used to cool the motor. If the dust, dirt or
debris has not been removed from these openings it will
cause the motor to run hotter than normal and will shorten
the life of the motor.
12. Check and clean with the brush and vacuum cleaner any
dust in the supply and return ducts as far as you can reach.
If these ducts look like they have an excessive amount of
dust, dirt or debris you should recommend to the home
owner or user to call a professional to properly clean the
duct system.
13. Check and clean any dust, dirt, or debris from all of the
controls and all of the surfaces in the control box. If dust
or dirt is left on the components they will operate at a
much hotter temperature causing premature component
failure.
14. Reinstall the blower assembly and secure the assembly to
the casing by using the screws that was removed in step 5.
15. Reinstall the lower access door on the front of the
evaporator coil compartment.
16. Reinstall the upper access door on the air handler.
17. Follow the instructions exactly as shown in Startup and
Shutdown Section in this manual to properly startup this
appliance.
SECTION III: AIR HANDLER CONTROLS
Electric Heat Models
This section discusses the air handler controls and how they
operate. Refer to Figure 9 for component locations.
1. The Limit Controls – Each electric heater element has a
limit control directly in front of it to sense overheating of
the element and open if the temperature gets above the set
point of the limit control.
2. The Heater Relays – The electric heater relays simply
turn the heater elements on and off. The relays are
controlled by the thermostat. On a call for heat 24 VAC is
sent to the relay(s) 24 VAC coil energizing the relay.
When the call for heat has been satisfied the 24 VAC is
removed from the relays 24 VAC coil de-energizing the
relay(s).
3. Cooling Time Delay Relay (TDR) – The cooling
sequencer relay is used only on models with a PSC motor.
When the thermostat calls for cooling or the fan switch on
the thermostat is moved from the “AUTO” to the “ON”
position, 24 VAC is placed on the “G” terminal from the
thermostat to the 24 VAC coil on the sequencer relay. The
relay controls the blower on time delay and is not
adjustable. The sequencer setting is approximately 30 - 45
seconds on and 1 – 20 off.
4. Circuit breakers – The circuit breakers are designed as
over-current protection for the air handler internal
electrical components. Field wiring must be protected by
field supplied circuit breakers or fuses sized to protect the
wire connected to the air handler circuit breakers.
5. Transformer – The transformer is used to step down
voltage from 240 VAC to 24 VAC. The transformer
provides the required 24 VAC for the system control
circuit.
6. Blower Motor Isolation Relay - This relay is used to
load the TDR when using a PSC or X-13 motor or for
isolation between the high and low speeds of a motor. The
wiring has been designed so that the normally closed
contacts are used for heating and the normally open
contacts are used for cooling. The relay coil is energized
after the thermostat has a call from the “G” terminal
starting the time delay cycle on the sequencer relay. Once
the time delay relay has reached the delay setting the relay
contacts close energizing the isolation relay coil. The
normally closed contacts on the isolation relay open and
the normally open contacts close, energizing the motor on
the selected cooling speed.
ECM Motor Isolation Relay - This relay is not used on the
ECM motor which has programmable heating and cooling
blower time delays along with climate profile time delays. See
climate profile section for more information.
Hydronic Heat Models
This section discusses the air handler controls and how they
operate. Refer to Figure 10 for component locations.
1. Transformer – The transformer is used to step down
voltage from 240 VAC to 24 VAC. The transformer
provides the required 24 VAC for the system control
circuit.
2. Pump Relay – This relay is not used on all hydronic
models. This relay is a single pole single throw relay that
energizes the water pump on a call for heat. The 24 VAC
coil is connected to the thermostat “W” terminal. The coil
is energized on a call for heat closing the normally open
terminals sending 120 VAC thru the relay contacts to the
water pump motor. Once the call for heat has been
satisfied, the 24 VAC is removed from the thermostat
“W” terminal de-energizing the relay coil and opening the
contacts to the water pump motor.
3. PSC Blower Motor Isolation Relay - This relay is a
single pole double throw relay. Is required for isolation
between the high and low speeds of a motor. The wiring
has been designed so that the normally closed contacts are
used for heating and the normally open contacts are used
for cooling. The relay coil is energized after the
thermostat has a call from the “G” terminal. The normally
closed contacts on the isolation relay open and the
normally open contacts close, energizing the motor on the
selected cooling speed.
4. ECM Motor Isolation Relay - This relay is not used on
the ECM motor has programmable heating and cooling
blower time delays along with climate profile time delays.
See climate profile section for more information.
SECTION IV: SEQUENCE OF OPERATION
Continuous Blower – Electric Heat Models
The thermostat has a manual fan switch that can be moved to
the “On” position or it can be programmed for continuous fan

MORTEXPRODUCTSINCFORTWORTH,TX76106Page11
operation. This setting causes the thermostat to complete the
circuit between “R” and “G” terminals causing the sequencer
relay to start the time delay cycle. Once the time delay relay
has completed the on-delay cycle the contacts will close
sending voltage to the isolation relay coil. The isolation relay
will close the normally open contacts (Terminals #2 and #4)
sending voltage to selected indoor blower motor speed tap
connected to terminal #4. The normally closed contacts
(Terminals #5 and #6) will open.
The indoor blower will operate continuously until the fan
switch on the thermostat has been switched from on to auto.
Continuous Blower – Hydronic Heat Models
The thermostat has a manual fan switch that can be moved to
the “On” position or it can be programmed for continuous fan
operation. This setting causes the thermostat to complete the
circuit between “R” and “G” terminals sending 24 VAC to the
isolation relay coil. The isolation relay will close the normally
open contacts (Terminals #2 and #4) sending voltage to
selected indoor blower motor speed tap connected to terminal
#4. The normally closed contacts (Terminals #5 and #6) will
open.
The indoor blower will operate continuously until the fan
switch on the thermostat has been switched from on to auto.
Figure 12: Component Locations – Electric Heat
Models
Figure 13: Component Locations – Hydronic Heat
Models
Intermittent Blower – Cooling
Electric Heat Models
The thermostat has a manual fan switch that can be moved to
the “Auto” position or it can be programmed for auto fan
operation. When the thermostat calls for cooling, a circuit is
completed between the “R”, “Y” and “G” Terminals. The
indoor fan motor is energized from the “G” terminal on the
thermostat causing the time delay relay to start the on-time
delay. The time delay relay contacts will close the circuit to
the isolation relay coil after the on- delay is complete. The
isolation relay normally open contacts (Terminals #2 and #4)
will close and the motor will operate on the selected speed tap
that has been placed on terminal #4.
When the thermostat is satisfied the circuit between “R”, “Y”
and “G” will open. The time delay relay will open the circuit
to the isolation relay and the PSC blower motor will turn off.
The X-13 blower motor will have a 13 second off-delay. The
blower is now in the standby mode waiting for the next
cooling cycle
Hydronic Heat Models
The thermostat has a manual fan switch that can be moved to
the “Auto” position or it can be programmed for auto fan
operation. When the thermostat calls for cooling, a circuit is
completed between the “R”, “Y” and “G” terminals sending
24 VAC to the isolation relay coil. The isolation relay
Co
ntr
o
l B
o
x

MORTEXPRODUCTSINCFORTWORTH,TX76106Page12
normally open contacts (Terminals #2 and #4) will close and
the motor will operate on the selected speed tap that has been
placed on terminal #4.
When the thermostat is satisfied the circuit between “R”, “Y”
and “G” will open. The circuit to the isolation relay will open
and the PSC or X-13 blower motor will turn off. The blower is
now in the standby mode waiting for the next cooling cycle
The Heating Cycle
Electric Heat Models
When the thermostat is in the HEAT mode and the fan switch
on the thermostat is set to AUTO. The call for heat closes the
thermostat circuit between the “R” and “W” terminals. 24
VAC is sent from the “W” terminal on the thermostat, through
the white thermostat wire, to the white pigtail wire on the air
handler, to the 24 VAC coil on the first heater relay. This
signal energizes the heater relay, closing the contacts and
sending 240 vac to the heaters. The blower PSC motor low
speed wire is also connected to the heater terminal on the first
heater relay so the blower is energized at the same time as the
heater. The blower will continue to operate until the
thermostat is satisfied. When the call for heat has been
removed the “W” terminal is de-energized and the heater relay
opens turning off the heater and the PSC blower motor.
The X-13 blower motor is connected to the normally closed
contacts of the isolation relay. The 24 VAC signal from the
“W” terminal on the thermostat will energize the motor at the
same time as the heater relay and will de-energize the motor at
the same time as the heater relay.
The furnace is now in standby mode waiting for the next
heating cycle.
Some models have a brown pigtail wire that is connected to
the 24 VAC coil on the second heater relay. This pigtail wire
is to be used for second stage heat. It is connected to the
thermostat “W2” terminal. You must have a thermostat that
has the second stage heating feature “W2” to use this feature.
The second stage heat cycle is enabled when the room
temperature typically falls more than 3 degrees below the
thermostat set point. The thermostat energizes the second
heater to aid in heating the room back to the thermostat set
point. Once the room is within 1 degree of the thermostat set
point the second stage heater is de-energized until the
thermostat calls for second stage heat “W2” again.
Hydronic Heat Models
When the thermostat is in the HEAT mode and the fan switch
on the thermostat is set to AUTO. The call for heat closes the
thermostat circuit between the “R” and “W” terminals. 24
VAC is sent from the “W” terminal on the thermostat, through
the white thermostat wire to the white pigtail wire on the air
handler, to the 24 VAC coil on the water pump relay. This will
energize the water pump and start circulation of hot water
through the water coil.
At the same time 24 VAC is sent to the heat relay coil
energizing the relay and closing the normally open contacts on
the heat relay sending 120 VAC through the normally closed
contacts on the isolation relay to blower PSC motor low speed
wire. The blower will continue to operate until the thermostat
is satisfied. When the call for heat has been removed the “W”
terminal is de-energized and the heat relay and the pump relay
open turning off the water pump and the PSC blower motor.
The X-13 blower motor is connected to the normally closed
contacts of the isolation relay. The 24 VAC signal from the
“W” terminal on the thermostat will energize the motor at the
same time as the water pump relay and will de-energize the
motor at the same time as the water pump relay.
The furnace is now in standby mode waiting for the next
heating cycle.
The Cooling Cycle
Electric Heat Models
When the thermostat calls for cooling
The thermostat closes the circuit between the “R”, “Y” and
“G” terminals. 24 VAC is sent from the “Y” terminal through
the yellow thermostat wire to the 24 VAC coil terminal on the
condenser contactor; energizing the contactor and starting the
compressor and outdoor fan motor. At the same time the “G”
terminal is sending 24 VAC through the green pigtail wire to
the indoor blower time delay sequencer. The time delay
sequencer goes through a 30 - 45 second on-delay, and then
closes the normally open contacts sending 24 VAC to terminal
#1 on the isolation relay coil ( Coil between terminals #1 and
#3). The isolation relay coil is energized closing the normally
open contacts (Terminals #2 and #4) and opening the normally
closed contacts (Terminals #5 and #6) sending 24 VAC to the
selected X-13 motor speed tap wire connected to isolation
relay terminal #4 or for PSC motors; sending 240 VAC to the
selected speed tap wire connected to isolation relay terminal
#4.
When the thermostat call for cooling has been satisfied the
thermostat opens the circuit between the “R”, “Y” and “G”
terminals. The 24 VAC signal is removed from the thermostat
“Y” terminal de-energizing condenser contactor and outdoor
fan motor. At the same time the “G” terminal 24 VAC is
removed from the green pigtail wire de-energizing the time
delay sequencer. The sequencer will go through a 1-20 second
off delay.
The cooling cycle is complete, and the cooling unit is ready
for the start of the next cooling cycle.
The Motor Isolation Relay
This relay is used in conjunction with the motors to prevent
the possibility of the motors being energized on two speed
taps at the same time. This condition would burn out the motor
windings.
PSC motor has a black wire is connected from the circuit
breaker to the supply side of the normally open terminals on
the relay. The blower motor high speed tap wire is connected
to the load side (Terminal #4) normally open terminal on
relay.
X-13 motor has a black wire that is connected from the “W”
terminal #1 on the heat relay to the supply side (Terminal #2)
of the normally open terminals on the isolation relay. The
blower motor high speed tap wire is connected to the load side
(Terminal #4) normally open terminal on relay.
PSC motor has a red wire is connected from the load side of
the heat relay (Terminal # 4 or 6) to the normally closed
terminal (Terminal #5) on the isolation relay. The load side

MORTEXPRODUCTSINCFORTWORTH,TX76106Page13
(Terminal #6) of the normally closed terminal is connected to
the low speed tap blower motor.
X-13 motor has a red wire is connected from the 24 VAC coil
of the heat relay (Terminal #0) to the normally closed terminal
(Terminal #5) on the isolation relay. The load side (Terminal
#6) of the normally closed terminal is connected to the low
speed tap blower motor.
ECM motors are connected and controlled by a ECM control
board. The thermostat wires are connected to the thermostat
terminals on the ECM control board. Isolation relay is not
used with a ECM motor.
Figure 14: Motor Speed Tap Isolation Relay – X-13 and
PSC Motors
SECTION V: TROUBLE SHOOTING
The following checks should be made before trouble shooting
the air handler controls for a no heat issue.
1. Check all of the circuit breakers. Make sure they are
turned to the “ON” position and have not tripped.
2. Check all fuses, especially any supply line fuses that were
installed during installation. If the fuse is blown, check
the wiring with an OHM meter for a short to ground. If
shorted, repair the short, and then replace the fuse.
3. Check any electrical switches that are external to the
furnace to make sure they are turned on.
4. Check all wiring connections, especially on any of the
components, to ensure they are securely fastened.
Electric Heat Models
If you have electric heaters and there is 240 volts coming out
of the control box circuit breakers and you have 24 volts
between to the “R” wire and ground, then continue on through
the rest of the checks.
X-13 Motor Check – Electric Heat Models
If the motor is not running, check for 240 volts and 24 volts at
the motor terminals. If the 240 volts and 24 volts is present at
the motor terminals but the motor is not operating, then
replace the motor. Refer to Figure 14 and Table 1 for terminal
locations and definitions.
If 240 volts is not present check the connections to the circuit
breaker or check for an open breaker.
Hydronic Heat Models
If you have hydronic heat and there is 120 volts to the
transformer and you have 24 volts between to the “R” wire
and ground, then continue on through the rest of the checks.
X-13 Motor Check – Hydronic Heat Models
If the motor is not running, check for 120 volts and 24 volts at
the motor terminals. If the 120 volts and 24 volts is present at
the motor terminals but the motor is not operating, then
replace the motor. Refer to Figure 14 and Table 1 for terminal
locations and definitions.
If 120 volts is not present check the connections to the circuit
breaker or check for an open breaker.
Heating Mode
If 24 volts is not present check the thermostat “W” wire. If 24
volts is present, check the Heat Relay Terminal #4. If 24 volts
is present, check isolation relay terminal #6, if 24 volts is
present replace the wire going to the motor. If 24 volts is not
present at the heat relay or the isolation relay, then, change
that relay.
Cooling Mode
If 24 volts is not present check the thermostat “G” wire. If 24
volts is present, check the sequencer Relay Terminal #4. If 24
volts is present, check isolation relay terminal #4, if 24 volts is
present replace the wire going to the motor. If 24 volts is not
present at the sequencer relay change the relay. If 24 volts is
not present at the isolation relay coil but is not present on
terminal #6 change the isolation relay.
ECM Motor Check – Electric Heat Models
If the motor is not running, check for 240 volts is present at
the motor terminals and 24 volts is present at the control
board. If the 240 volts and 24 volts is present at the motor and
board but the motor is not operating, then check the control
board thermostat terminals to determine if 24 volts is present
at “R” and “W”.
ECM Motor Check – Hydronic Heat Models
If the motor is not running, check for 120 volts is present at
the motor terminals and 24 volts is present at the control
board. If the 120 volts and 24 volts is present at the motor and
board but the motor is not operating, then check the control
board thermostat terminals to determine if 24 volts is present
at “R” and “W”.
For personal safety be sure to turn the electrical power “OFF” at
the main entrance (Circuit Breaker Box) and at the control box
circuit breakers before attempting any service or maintenance
operations. Home owners should never attempt to perform any
maintenance which requires opening the air handler control box
door.

MORTEXPRODUCTSINCFORTWORTH,TX76106Page14
Figure 15: ECM Motor Control Pin out
Pin Number
1Common C1
2W/W1
3Common C2
4Delay Tap Select
5Cool Tap Select
6Y1
7Adjust Tap Select
8Output –
9Reversing Valve (Heat Pump Only)
10 Humidistat (BK)
11 Heat Tap Select
12 24 VAC (R)
13 2nd Stage Heat (EM/W2)
14 2nd Stage Cool (Y/Y2)
15 Fan (G)
16 Output +
NOTE: Volt meter will not read between pins 4, 5, 7, 11 and
1 or 3 because these signals are not full wave signals.
To verify ECM board is functioning properly in the heating
mode check for 24 volts between pins 1 and 2.
To verify ECM board is functioning properly in the cooling
mode check for 24 volts between pins 1 and 6 also 1 and 15.
PSC Motor Check – Electric Heat Models
If the motor is not running, check for 240 volts at the motor
speed tap terminal. If the 240 volts is present at the motor
speed tap terminal but the motor is not operating, then replace
the motor.
Heating Mode
If 240 volts is present at the motor check between the Heat
Relay Terminal #4 and L2. If 240 volts is present, check
isolation relay between terminal #6 and L2, if 240 volts is
present replace the motor. If 240 volts is not present between
the heat relay and L2 change the relay. If 240 volts is not
present between the isolation relay and L2 change the relay.
Cooling Mode
If 24 VAC is not present check the thermostat “G” wire. If 24
VAC is present, check the sequencer Relay Terminal #4 for
240 volts. If 240 volts is present, check isolation relay
terminal #4, if 240 volts is present replace the motor. If 240
volts is not present between Terminal #4 and L2 on the
sequencer relay, check for 24 volts at the coil. If 24 volts is
present at the coil change the relay. If 240 volts is not present
at the isolation relay, check for 24 volts at the coil. If 24 volts
is present at the coil but 240 volts is not present between
terminal #4 and L2 change the isolation relay.
PSC Motor Check – Hydronic Heat Models
If the motor is not running, check for 120 volts at the motor
speed tap terminal. If the 120 volts is present at the motor
speed tap terminal but the motor is not operating, then replace
the motor.
Heating Mode
If 120 volts is present at the motor check between the Heat
Relay Terminal #4 and Neutral. If 120 volts is present, check
isolation relay between terminal #6 and neutral, if 120 volts is
present, replace the motor. If 120 volts is not present between
the heat relay and neutral change the relay. If 120 volts is not
present between the isolation relay and neutral change the
relay.
Cooling Mode
If 24 VAC is not present, check the thermostat “G” wire. If 24
VAC is present, check the sequencer Relay Terminal #4 for
120 volts. If 120 volts is present, check isolation relay
terminal #4, if 120 volts is present, replace the motor.
If 120 volts is not present between Terminal #4 and neutral on
the sequencer relay, check for 24 volts at the coil. If 24 volts is
present at the coil change the relay.
If 120 volts is not present between terminal # 4 on the
isolation relay and neutral, but is present on terminal #2 and
neutral, check for 24 volts at the coil. If 24 volts is present at
the coil, change the isolation relay.
13
LOAD
1.5 AMP
MAX
CUT WIRE FOR 120/240VAC
.4 15
30 SECONDS
MADEIN
THE USA
ICM
HMPS00C2X30
DELAYON
MAKE
TIMER
CONTROLS
INPUT
19-240
VAC
Figure 16: Adjustable Time Delay Relay (TDR) Terminals
Figure 17: X-13 Motor Terminals
To avoid personal injury or property damage, make certain
that the motor leads cannot come into contact with non-
insulated metal com
p
onents of the unit.

MORTEXPRODUCTSINCFORTWORTH,TX76106Page15
Terminal Connection
C Speed Tap Common - 24 VAC Common
L Supply Voltage - 240 Vac Line 1
G Ground Connection
N/L2 Supply Voltage - 240 Vac Line 2
1 Low Speed Tap - 24 VAC Input
2 Medium-Low Speed Tap - 24 VAC Input
3 Medium Speed Tap - 24 VAC Input
4 Medium-High Speed Tap - 24 VAC Input
5 High Speed Tap - 24 VAC Input
Table 1: X-13 Motor Terminal Connections
Heater Element Is Not On
Check for 240 VAC between each of the heater elements. If
240 VAC is present, check the current draw on each heater. If
there is almost no current draw check the limit for that heater.
If the limit is good but there still is no current flow then, check
to see if the heater is defective.
The heater amps are as follows:
5 kW Heater = 20.8 amps
10 kW Heater = 41.6 amps
The heater design is as follows:
The 5 kW model has one 5 kW heater element.
The 10 kW model has one heater with two 5 kW elements
The 15 kW model has one heater with two 5 kW elements (top
heater) and one heater with one 5 kW element (bottom
heater).
The 20 kW model has one heater with two 5 kW elements (top
heater) and one heater with two 5 kW elements (bottom
heater).
If 240 VAC is not present at the heater element but there is
240 VAC present between the line terminal of the heater relay
and L2 circuit breaker but not across the heater, then, check
the limit control for an open limit and replace the open limit
control.
If 240 VAC is not present at the heater element or between the
load terminal of the heater relay and the L2 circuit breaker, but
is present between the line terminal of the heater relay and L2
circuit breaker; then, replace the heater relay.
DP - Double Pole Relay SP - Single Pole Relay
8642
0 1
Load Terminal
Load Terminal
Line Terminal
Line Terminal
64
0 1
28
Line Terminal
Load Terminal
Figure 18: Heater Relay Terminal Designations
HP ECM X-13 PSC
1/3 0.78 0.72 2.00
1/2 2.00 1.66 3.00
3/4 2.50 2.09 3.60
1.0 3.75 5.72
Table 2: 208 / 240 Volt Blower Motor Tested FLA
HP ECM X-13 PSC
1/3 1.80 2.72 4.40
1/2 2.31 2.72 7.70
3/4 6.31 5.71 11.00
1.0 8.48 8.48
Table 3: 120 Volt Blower Motor Tested FLA
Replacing the Blower
1. Follow the instructions exactly as shown in Startup and
Shutdown Section in this manual to properly shutdown
this appliance.
2. Remove the upper access door on the front of the air
handler.
3. Remove the lower access door on the front of the
evaporator coil compartment.
4. ECM or X-13 Motors - Unplug the wire harnesses from
the blower motor.
PSC Motor – Unplug the wires from the 6 pin plug at the
bottom of the control box.
5. Remove the two screws on the left and right side and the
center screw on the bracket in front of the blower
mounting plate and slide the blower out.
6. Reinstall the blower assembly and secure the assembly to
the casing by using the bracket and screws that were
removed in step 5.
7. Reinstall the lower access door on the front of the
evaporator coil compartment.
8. Reinstall the upper access door on the air handler.
9. Follow the instructions exactly as shown in Startup and
Shutdown Section in this manual to properly startup this
appliance.
10. Set the thermostat above the room temperature so the unit
will operate and you can observe the appliance startup to
ensure the appliance is operating correctly.
11. After proper operation has been observed and
documented, set the thermostat to the desired temperature.
Figure 19: Blower Mounting Plate Screw Locations
To avoid personal injury take precautions not come into
contact with non-insulated electrical components.
Avoid wearing loose clothing or any items that can come in
contact with moving parts, such as the blower wheel. This
can cause serious personal injury

MORTEXPRODUCTSINCFORTWORTH,TX76106Page16
SECTION VI: BLOWER PERFORMANCE
A 837 837 824 817 806
B 744 733 721 717 713
C 705 697 689 681 677
D 634 620 615 611 602
A 884 884 884 880 880
B 799 792 789 789 789
C 691 691 691 691 690
D 589 589 589 589 584
A 1422 1421 1421 1416 1416
B 1215 1214 1214 1214 1208
C 898 989 989 982 969
D 865 865 865 866 858
A 1294 1255 1200 1137 1058
B 1131 1104 1075 1082 1023
C 974 942 909 853 831
D 808 769 736 702 657
A 1957 1919 1900 1871 1847
B 1576 1565 1547 1517 1487
C 1495 1482 1451 1432 1409
D 1411 1385 1372 1338 1311
A 2001 1994 1994 1987 1972
B 1820 1820 1820 1804 1796
C 1587 1599 1604 1604 1604
D 1385 1385 1385 1385 1385
A 2393 2393 2393 2393 2388
B 2227 2227 2221 2221 2221
C 2012 2012 2005 2005 2005
D 1795 1795 1795 1795 1795
A 2132 2119 2091 2077 2063
B 1921 1901 1901 1886 1886
C 1724 1724 1724 1724 1707
D 1508 1508 1508 1488 1488
240 VC 12X9
MSVE37,42,48,60
Hydronic
3.0
Thru
5.0
1.00 120 VI 12X9
9X6
VW
Blower
Wheel
240
10X7
MSVE18,24
Hydronic 1.5&2.0
MSVE25,30,36
Electric
10X7
1.5
Thru
3.0
240
VA
0.33
CFM@
0.30"
CFM@
0.40"
CFM@
0.50"
CFM@
0.10"
CFM@
0.20"
Motor
HP
Volts1Ph.
50/60Hz.
Motor
Code Jumper
120 VG
0.50
0.33
MSV E72
Hydronic
VB
6.0 1.00 120
1.5
Thru
3.0
MSVE25,30,36
Hydronic 0.50
12X10
10X7VH
VU 12X10
MSVE37,42,48,60
Electric
3.0
Thru
5.0
0.75
Nominal
Tons
MSV E72
Electric 6.0
MSVE18,24
Electric 1.5&2.0
120
ModelNumber
1.00 240
Table 4: MSVE Blower Performance Chart – CFM Data with a ECM 2.3 Motor -Without Air Filters
A 0.530 0.610 0.650 0.710 0.780
B 0.430 0.470 0.490 0.520 0.560
C 0.370 0.430 0.470 0.500 0.530
D 0.310 0.350 0.380 0.420 0.450
A 3.120 3.470 3.730 4.060 4.370
B 2.440 2.710 2.950 3.240 3.620
C 1.760 2.090 2.400 2.690 2.910
D 1.270 1.530 1.810 2.090 2.310
A 1.690 1.730 1.790 1.950 2.030
B 1.020 1.110 1.190 1.270 1.390
C 0.580 0.640 0.710 0.780 0.850
D 0.440 0.510 0.570 0.640 0.690
A 3.700 3.800 3.700 3.500 3.400
B 2.700 2.800 3.000 3.100 3.200
C 1.900 2.000 2.100 2.100 2.300
D 1.200 1.300 1.500 1.600 1.700
A 1.900 1.900 2.100 2.300 2.500
B 1.100 1.200 1.400 1.500 1.600
C 0.800 0.900 1.100 1.200 1.200
D 0.900 1.000 1.200 1.300 1.400
A 6.240 6.400 6.690 7.110 6.310
B 4.970 5.130 5.320 5.510 5.650
C 3.540 3.750 3.860 4.120 4.330
D 2.580 2.720 2.850 3.070 3.290
A 2.920 3.130 3.290 3.570 3.750
B 2.280 2.390 2.620 2.780 2.960
C 1.650 1.810 2.030 2.130 2.330
D 1.210 1.310 1.510 1.610 1.730
A 8.170 8.410 8.680 8.990 9.200
B 5.760 6.100 6.410 6.640 7.070
C 4.010 4.390 4.740 5.060 5.460
D 2.690 2.910 3.150 3.410 3.670
0.75 240 VC 12X9
MSVE37,42,48,60
Hydronic
3.0
Thru
5.0
1.00 120 VI 12X9
AMPS@
0.20"
AMPS@
0.30"
AMPS@
0.40"
AMPS@
0.50"
ModelNumber Nominal
Tons
Motor
HP
Volts1Ph.
50/60Hz.
Motor
Code
VW 12X10
VB 10X7
VH 10X7
MSVE72
Hydronic 6.0 1.00 120
1.00 240 VU 12X10
MSVE25,30,36
Hydronic
1.5
Thru
3.0
0.50 120
MSVE72
Electric 6.0
MSVE37,42,48,60
Electric
3.0
Thru
5.0
MSVE25,30,36
Electric
1.5
Thru
3.0
0.50 240
VG 10X7
MSVE18,24
Electric 1.5&2.0
MSVE18,24
Hydronic 1.5&2.0 0.33 120
Blower
Wheel Jumper AMPS@
0.10"
0.33 240 VA 9X6
Table 5: MSVE Blower Performance Chart – Amp Data with a ECM 2.3 Motor -Without Air Filters

MORTEXPRODUCTSINCFORTWORTH,TX76106Page17
1 795 783 726 709 691
2 872 865 806 790 775
3 1002 970 929 884 827
4 1088 1048 998 938 872
5 1114 1073 1018 960 888
1 693 666 657 618 598
2 753 745 711 693 675
3 785 753 745 720 702
4 838 816 808 777 753
5 874 860 846 816 769
1 814 791 752 711 658
2 846 828 799 768 711
3 1059 1036 1007 982 957
4 1152 1136 1104 1087 1053
5 1247 1213 1192 1167 1136
1 714 668 639 587 517
2 874 845 806 782 732
3 1082 1046 1015 983 951
4 1156 1122 1094 1065 1028
5 1313 1262 1226 1156 1077
1 1339 1247 1198 1160 1107
2 1467 1415 1394 1339 1294
3 1556 1518 1478 1427 1385
4 1661 1617 1590 1532 1493
5 2070 2034 1997 1951 1897
1 1479 1448 1416 1373 1341
2 1558 1529 1499 1459 1438
3 1641 1614 1596 1548 1510
4 1783 1749 1723 1670 1625
5 1935 1879 1764 1764 1694
1 1910 1865 1826 1787 1787
2 2088 2054 2019 1969 1932
3 2240 2201 2162 2129 2088
4 2370 2339 2290 2246 2208
5 2504 2470 2441 2393 2351
1 1637 1619 1584 1547 1510
2 1795 1771 1730 1697 1663
3 1887 1865 1842 1803 1754
4 1990 1954 1903 1849 1787
5 2040 1990 1925 1872 1810
MSVT37,42,48,60
Hydronic
3.0
Thru
5.0
1.00 120 VL 12X9
MSVT37,42,48,60
Electric
3.0
Thru
5.0
0.75 240 VF 12X9
CFM@
0.40"
240
Motor
Tap
CFM@
0.10"
CFM@
0.20"
Blower
Wheel
1.5
Thru
3.0
0.50
MSVT18,24
Hydronic 1.5&2.0
MSVT25,30,36
Electric
ModelNumber Nominal
Tons
Motor
HP
0.33
0.331.5&2.0
MSVT18,24
Electric
MSVT72
Hydronic 6.0
MSVT25,30,36
Hydronic
1.5
Thru
3.0
MSVT72
Electric 6.0 1.00
0.50
240
120 VJ
Motor
Code
240 VD
VE
Volts1Ph.
50/60Hz.
120 VK
12X101.00 120
VV 12X10
9X6
CFM@
0.50"
9X6
CFM@
0.30"
VX
10X7
10X7
Table 6: MSVT Blower Performance Chart – CFM Data with a X-13 Motor -Without Air Filters
1 0.370 0.400 0.420 0.430 0.450
2 0.440 0.470 0.480 0.490 0.520
3 0.490 0.500 0.530 0.540 0.550
4 0.510 0.530 0.550 0.580 0.590
5 0.660 0.670 0.700 0.710 0.720
1 0.900 0.900 1.000 1.100 1.200
2 1.100 1.200 1.200 1.200 1.300
3 1.200 1.200 1.300 1.300 1.310
4 1.400 1.400 1.500 1.510 1.600
5 1.600 1.700 1.700 1.710 1.800
1 0.650 0.670 0.700 0.720 0.750
2 0.810 0.840 0.870 0.900 0.940
3 1.120 1.150 1.180 1.220 1.210
4 1.350 1.380 1.410 1.440 1.450
5 1.590 1.610 1.620 1.630 1.660
1 1.500 1.500 1.600 1.700 1.710
2 2.300 2.400 2.400 2.410 2.410
3 2.600 2.600 2.600 2.610 2.620
4 2.600 2.600 2.610 2.620 2.630
5 2.700 2.700 2.710 2.710 2.720
1 0.640 0.640 0.690 0.730 0.770
2 0.820 0.860 0.900 0.940 1.000
3 0.960 1.000 1.050 1.090 1.140
4 1.080 1.120 1.170 1.210 1.290
5 2.000 2.050 2.090 2.140 2.250
1 2.920 2.970 3.060 3.140 3.250
2 3.440 3.480 3.590 3.660 3.740
3 3.950 4.050 4.120 4.210 4.270
4 5.050 5.120 5.180 5.240 5.270
5 6.830 6.580 6.260 5.990 5.710
1 2.810 2.910 3.000 3.140 3.260
2 3.680 3.800 3.940 4.030 4.170
3 4.410 4.550 4.660 4.770 4.900
4 5.510 5.630 5.720 5.850 5.960
5 6.690 6.830 6.880 6.970 7.090
1 3.530 3.630 3.680 3.770 3.820
2 4.600 4.680 4.760 4.850 4.910
3 5.460 5.500 5.600 5.610 5.550
4 6.410 6.430 6.220 6.040 5.830
5 6.860 6.640 6.440 6.220 6.050
MSVT37,42,48,60
Hydronic
3.0
Thru
5.0
1.00 120 VL 12X9
MSVT37,42,48,60
Electric
3.0
Thru
5.0
0.75 240 VF 12X9
AMPS@
0.50"
AMPS@
0.20"
AMPS@
0.30"
AMPS@
0.40"
ModelNumber Nominal
Tons
Motor
HP
AMPS@
0.10"
Volts1Ph.
50/60Hz.
Motor
Code
Blower
Wheel
12X10
MSVT72
Electric 6.0
MSVT72
Hydronic 6.0 1.00 120
1.00 240
VX
VE 10X7
VK 10X7
VV 12X10
MSVT25,30,36
Hydronic
1.5
Thru
3.0
0.50 120
MSVT25,30,36
Electric
1.5
Thru
3.0
0.50 240
VJ 9X6
MSVT18,24
Electric 1.5&2.0 240
MSVT18,24
Hydronic 1.5&2.0 0.33 120
VD0.33 9X6
Motor
Tap
Table 7: MSVT Blower Performance Chart – Amp Data with a X-13 Motor -Without Air Filters

MORTEXPRODUCTSINCFORTWORTH,TX76106Page18
Low 859 822 776 735 674
Med 925 881 835 779 726
High 982 931 885 828 757
Low 772 731 683 635 569
Med 815 764 718 665 598
High 836 791 739 678 612
Low 1087 1070 1035 999 941
Med 1280 1230 1169 1115 1035
High 1448 1378 1304 1222 1154
Low 930 956 969 950 917
Med 1206 1190 1154 1105 1043
High 1412 1355 1281 1217 1139
Low 1462 1452 1432 1402 1371
Med 1756 1723 1689 1664 1612
High 2092 2029 1979 1898 1852
Low 1091 1087 1084 1078 1051
Med 1456 1446 1446 1446 1426
High 2231 2171 2103 2040 1989
MSPS37,42,48,60
Hydronic
3.0
Thru
5.0
120
2.0
Thru
3.0
MSPS25,30,36
Electric 0.50
MSPS37,42,48,60
Electric 0.75
120
CFM@
0.40"
CFM@
0.20"
CFM@
0.30"
240
0.33 240 9X6RA
ModelNumber Nominal
Tons
Motor
HP
1.5&2.0
CFM@
0.50"
3.0
Thru
5.0
0.75
MSPS25,30,36
Hydronic
2.0
Thru
3.0
0.50
MSPS18,24
Electric
MSPS18,24
Hydronic 1.5&2.0
RK
RH
Volts1Ph.
50/60Hz.
Motor
Code
240
RD
RJ
RC
12X9
Blower
Wheel
Motor
Tap
CFM@
0.10"
0.33 120
12X9
10X7
10X7
9X6
Table 8: MSPS Blower Performance Chart – CFM Data with a PSC Motor -Without Air Filters
Low 1.50 1.40 1.30 1.20 1.10
Med 1.60 1.50 1.40 1.30 1.20
High 1.80 1.80 1.70 1.60 1.60
Low 2.80 2.60 2.50 2.30 2.20
Med 3.10 2.90 2.80 2.70 2.50
High 3.70 3.60 3.50 3.40 3.30
Low 2.70 2.40 2.30 2.10 1.90
Med 2.80 2.60 2.40 2.30 2.10
High 3.20 3.10 3.00 2.80 2.70
Low 5.90 5.30 5.10 4.70 4.30
Med 6.50 5.90 5.50 5.10 4.70
High 6.70 6.30 6.00 5.70 5.40
Low 3.70 3.50 3.40 3.30 3.20
Med 4.40 4.10 4.00 3.90 3.70
High 5.10 4.60 4.50 4.30 4.20
Low 7.60 7.30 7.00 6.90 6.50
Med 9.80 9.30 8.90 8.70 8.20
High 13.40 12.90 12.60 12.10 11.90
AMPS@
0.50"
AMPS@
0.10"
AMPS@
0.20"
AMPS@
0.30"
AMPS@
0.40"
Motor
Code
Blower
Wheel
Motor
Tap
Volts1Ph.
50/60Hz.
RK 12X9
MSPS37,42,48,60
Electric
3.0
Thru
5.0
MSPS37,42,48,60
Hydronic
3.0
Thru
5.0
0.75 120
0.75 240
RC 10X7
RD 10X7
RH 12X9
MSPS25,30,36
Hydronic
2.0
Thru
3.0
0.50 120
MSPS25,30,36
Electric
2.0
Thru
3.0
0.50 240
0.33 120 RJ 9X6
RA 9X6
ModelNumber Nominal
Tons
MSPS18,24
Electric 1.5&2.0 0.33 240
Motor
HP
MSPS18,24
Hydronic 1.5&2.0
Table 9: MSPS Blower Performance Chart – Amp Data with a PSC Motor -Without Air Filters

MORTEXPRODUCTSINCFORTWORTH,TX76106Page19
Figure 20 ECM Control Board Diagrams
ABCDABCD
CFMCFMCFMCFMCFMCFMCFMCFM
HiCooling/HPHeating
√√
++ 1000 900 800 700
LowCooling/HPHeating
√ 850 750 700 610
AuxiliaryHeat
√√√ +++ +++ +++ +++ 1000 900 800 700
EmergencyHeat
√ +++ +++ +++ +++ 1000 900 800 700
ContinuousBlower
√ 500 450 400 350
HiCooling/HPHeating
√√ ++ 1600 1400 1200 1100
LowCooling/HPHeating
√√ 1500 1300 1100 1050
AuxiliaryHeat
√√√
+++ +++ +++ +++ 1600 1400 1200 1100
EmergencyHeat
√ +++ +++ +++ +++ 1300 1175 1000 960
ContinuousBlower
√ 800 700 600 550
HiCooling/HPHeating
√√ ++ 2100 1700 1500 1490
LowCooling/HPHeating
√√ 2000 1600 1450 1350
AuxiliaryHeat
√√√ +++ +++ +++ +++ 2100 1700 1500 1490
EmergencyHeat
√ +++ +++ +++ +++ 1800 1585 1485 1485
ContinuousBlower
√
1050 850 750 745
HiCooling/HPHeating
√√ ++ 2400 2300 2100 1900
LowCooling/HPHeating
√√ 2400 2200 2000 1800
AuxiliaryHeat
√√√ +++ +++ +++ +++ 2400 2300 2100 1900
EmergencyHeat
√ +++ +++ +++ +++ 2400 2300 2100 1900
ContinuousBlower
√ 1200 1150 1050 950
BlowerPerformanceData‐VariableSpeed(HighEfficiency)ECM2.3Motor
MSVE18,24
Cool Heat
√
=EnergizedTe rm i n al
Y1 Y2 W1 W2 EM G HUM
MSVE25,30,36
MSVE37,42,48,60
MSV E72
ControlBoardTapsThermostatTerminals
OperatingModeUnitSize
Table 10: Blower CFM For The Heat and Cool ECM Control Board Tap Selections
“+++” When auxiliary heat and heat pump are activated the airflow will increase to the higher CFM selected by the “HEAT” or
“COOL” jumper pin on the ECM Board.
The “COOL” jumper pins select the CFM for both cooling or heat pump operation. Heat Pump and Cooling use different CFM
Tables.
“++” Remove 24 VAC signal to “HUM” terminal by cutting the dehumidify resistor. This will cause the motor CFM to be reduced by
30%. Humidistat must be programmable to remove signal to “HUM” terminal on humidity rise. (Refer to Figure 1)
Adjust tap “+” increases airflow by 10%.
Adjust tap “-“ reduces airflow by 12%.
Adjust tap “TEST - The motor is programmed to ignore the “TEST” pin. This prevents field service personnel from leaving the
jumper pin in the “TEST” mode.
“PROFILES” – Climate Profiles are used to ramp up to the selected CFM and ramp the motor down to 0 CFM depending on the
climate you are residing. Refer to the Climate Profiles drawings, Figures 1 and 2 to determine what profile is best profile for
your area, then, change the jumper pin under PROFILES to select the A, B, C or D profile. The Climate Profiles are the same
for Cooling and Heat Pump. Profiles “E” for Electric Heat and “F” for Emergency Heat are programmed settings and are not
field adjustable. Refer to Figure 2 “Electric w/ Element On and/or Off Delays” for the “E” and “F” profile.
PWM – Pulse Width Modulation – The blower motor must be returned to the factory to be reprogrammed in order to be operated in
the PWM mode. It is recommended the air handler be ordered for PWM operation.

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SECTION VII: ECM 2.3 CLIMATE PROFILES
Background
The GE ECM 2.3 motor has an extensive array of
programmable features for varying airflow as a function of
time. These options are beneficial to enhance comfort and
efficiency in furnaces, air conditioners and heat pumps. The
options are called “Delay Profiles” and “Slew Rates” and are
created by OEM Design Engineers using the ECM
programming software.
The delay profiles can be adjusted in the installation to
optimize comfort. The ECM 2.3 supports five field selectable
profiles that can be used for heating or cooling. We
recommend programming the motor to use 1 heating and 4
cooling profiles. Each profile, which represents one complete
thermostat cycle, has 4 unique components called PreRun,
Short Run, Full Capacity, and Off Delay. In the field, profiles
are selected by moving a jumper or dip switch setting. Slew
rates are preprogrammed in the control memory, and are not
field adjustable.
Cooling Profiles (refer to Fig. 1)
These profiles are used to provide dehumidification and
improve system efficiency.
PreRun allows for a reduced airflow capacity at compressor
startup (“On” in the profile diagrams). In humid climates
where dehumidification is highly desired, a reduced
percentage of the maximum CFM can be selected to allow
more moisture to collect and then drain from the coils.
The Short Run CFM and time can be selected to achieve
various degrees of dehumidification and reduce re-
evaporation. In more arid or moderate climates, these values
are modified to achieve full capacity cooling in a shorter time
period.
The Off Delay is intended to allow the blower to run for a
period of time after the compressor shuts off. In arid and
moderate climates this feature will evaporate moisture back
into the air.
In humid climates this time is programmed to zero to
minimize re-evaporation of evaporator coil and drain pan
moisture back into the conditioned space.
Heating Profiles (refer to Fig 2.)
These profiles are used to provide a high degree of comfort
and to improve system efficiency. There are a variety of
profiles available to accommodate most popular heating
technologies. It may be desirable for a gas or oil furnace to
have a short PreRun delay at very low airflow until the heat
exchanger is up to an adequate temperature. At the end of the
heating cycle, an Off delay can be used to improve system
efficiency by continuing to move air across the exchanger
until the residual heat is removed. In the case of electric heat,
a rapid On slew rate to full capacity is used to prevent
overheating of the coils. Likewise, a rapid Off slew rate will
prevent blowing cool air into the home after the heating coils
have shut off. If thermal relays are used to control the
heating coils or if coils are staged, then the On slew, PreRun
heating, and Off slew can be set at different rates to match
relay performance.
Unique requirements of heat pumps can also be
accommodated by matching delays to individual system
performance characteristics. An emergency or backup profile
can also be created to match system response to a call for
secondary heat in the heat pump application.
NOTE: Cold area is shaded in white in Canada only.