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

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

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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

ersonal in

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

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

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