Allied Air A97USMV Installation Instructions Manual

INSTALLATION INSTRUCTIONS

A97USMV

Warm Air Gas Furnace

Upflow/Horizontal Left and Right Air Discharge

This manual must be left with the homeowner for future reference.

This is a safety alert symbol and should never be ignored. When you see this symbol on labels or in manuals, be alert to the potential for personal injury or death.

CAUTION

As with any mechanical equipment, personal injury can result from contact with sharp sheet metal edges. Be careful when you handle this equipment.

WARNING

Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury or loss of life. Installation and service must be performed by a licensed professional installer (or equivalent), service agency or the gas supplier.

NOTICE

A thermostat is not included and must be ordered separately.

• A Comfort Sync™ thermostat must be used in communicating applications.

• In non-communicating applications, a traditional non-communication thermostat may be used.

In all cases, setup is critical to ensure proper system operation.

Field wiring for both communicating and noncommunicating applications is illustrated in these instructions.

Unit Dimensions ...................................................................................... 2

Parts Arrangement................................................................................... 3

Gas Furnace ............................................................................................ 4

Shipping and Packing List ....................................................................... 4

Safety Information ................................................................................ 4

Use of Furnace as a Construction Heater ............................................... 5

General .................................................................................................... 6

Setting Equipment ................................................................................... 6

Filters ......................................................................................................11

Duct System ...........................................................................................11

Pipe and Fittings Specifications ............................................................. 12

Joint Cementing Procedure ................................................................... 13

Venting Practices ................................................................................... 14

Vent Piping Guidelines .......................................................................... 14

Gas Piping ............................................................................................ 28

TABLE OF CONTENTS

Electrical .............................................................................................31

Integrated Control .................................................................................. 40

Blower Motor Performance .................................................................... 48

Unit Start Up .......................................................................................... 54

Gas Pressure Measurement.................................................................. 55

High Altitude Information ....................................................................... 56

Proper Combustion................................................................................ 56

Other Unit Adjustments.......................................................................... 59

Heating Sequence of Operation ............................................................ 60

Service .............................................................................................62

Planned Service .................................................................................... 64

Integrated Control Diagnostic Codes ..................................................... 65

Configuring Unit Size Codes ................................................................. 66

Troubleshooting ..................................................................................... 67

Repair Parts List .................................................................... 73

*P507028-03*

(P) 507028-03

Manufactured By

Allied Air Enterprises LLC

A Lennox International, Inc. Company

215 Metropolitan Drive

West Columbia, SC 29170

507028-03 Issue 1622 Page 1 of 74

Unit Dimensions - inches (mm)

* NOTE - C/D20 size units that require second stage air volumes over 1800 cfm (850 L/S) must have one of the following:

1. Single side return air with transition, to accommodate

20 x 25 x 1 in. (508 x 635 x 25 mm) air filter.

2. Single side return air with optional RAB Return Air Base

3. Bottom return air.

4. Return air from both sides.

5. Bottom and one side return air.

See Blower Performance Tables for additional information.

* Optional External Side Return Air Filter Kit is not for use with the optional RAB Return Air Base.

Page 2 of 74 Issue 1622 507028-03

A97USMV Exploded View

507028-03

Figure 1

Issue 1622 Page 3 of 74

A97USMV Gas Furnace

The A97USMV Category IV gas furnace is equipped with a variable capacity, varable speed integrated control. Each

A97USMV is shipped ready for installation in the upflow, horizontal left air discharge or horizontal right air discharge position.

The furnace is equipped for installation in natural gas applications only. A change over kit must be ordered for

LP/propane applications.

The A97USMV must be installed only as a Direct Vent gas central furnace

NOTE: In Direct Vent installations, combustion air is taken from outdoors and flue gases are discharged outdoors. See

Figure 2 for applications including roof termination.

Safety Information

DANGER

DANGER OF EXPLOSION!

There are circumstances in which odorant used with

LP/Propane gas can lose its scent. In case of a leak,

LP/Propane gas will settle close to the floor and may be difficult to smell. An LP/Propane leak detector should be installed in all LP applications.

WARNING

Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury or loss of life. Installation and service must be performed by a licensed professional installer (or equivalent), service agency or the gas supplier.

Figure 2

Shipping and Packing List

1 - Assembled A97USMV unit.

1 - Bag assembly containing the following:

1 - Snap bushing

1 - Snap Plug

1 - Wire tie

1 - Condensate trap

1 - Condensate trap cap

1 - Condensate trap cap clamp

1 - 3/4” Threaded PVC street elbow

Check equipment for shipping damage. If you find any damage, immediately contact the last carrier.

Please refer to specification sheets for available accessories.

CAUTION

As with any mechanical equipment, personal injury can result from contact with sharp sheet metal edges. Be careful when you handle this equipment.

Use only the type of gas approved for use with this furnace.

Refer to unit nameplate.

Building Codes

In the USA, installation of gas furnaces must conform with local building codes. In the absence of local codes, units must be installed according to the current National Fuel

Gas Code (ANSI Z223.1/NFPA 54). The National Fuel Gas

Code is available from the American National Standards

Institute, Inc., 11 West 42nd Street, New York, NY 10036 .

Installed Locations

In Canada, installation must conform with current National

Standard of Canada CSA-B149 Natural Gas and Propane

Installation Codes, local plumbing or waste water codes and other applicable local codes.

The furnace is designed for installation clearances to combustible material as listed on the unit nameplate and in the tables in Figures 10 and 11. Accessibility and service clearances must take precedence over fire protection clearances.

NOTE: For installation on combustible floors, the furnace shall not be installed directly on carpeting, tile, or other combustible material other than wood flooring.

Page 4 of 74 Issue 1622 507028-03

For installation in a residential garage, the furnace must be installed so that the burner(s) and the ignition source are located no less than 18 inches (457 mm) above the floor.

The furnace must be located or protected to avoid physical damage by vehicles. When a furnace is installed in a public garage, hangar, or other building that has a hazardous atmosphere, the furnace must be installed according to recommended good practice requirements and current

National Fuel Gas Code or CSA B149 standards.

Note: Furnace must be adjusted to obtain a temperature rise (100% percent capacity) within the range(s) specified on the unit nameplate. Failure to do so may cause erratic limit operation and may also result in premature heat exchanger failure.

This furnace must be installed so that its electrical components are protected from water.

Installed in Combination with a Cooling Coil

When this furnace is used with cooling units, it shall be installed in parallel with, or on the upstream side of, cooling units to avoid condensation in the heating compartment.

With a parallel flow arrangement, a damper (or other means to control the flow of air) must adequately prevent chilled air from entering the furnace. If the damper is manually operated, it must be equipped to prevent operation of either the heating or the cooling unit, unless it is in the full HEAT or COOL setting. See Figure 3.

Heating Unit Installed Parallel to Air Handler Unit

Heating Unit Installed Upstream of Cooling Unit

Figure 3

When installed, this furnace must be electrically grounded according to local codes. In addition, in the United States, installation must conform with the current National Electric

Code, ANSI/NFPA No. 70. The National Electric Code

(ANSI/NFPA No. 70) is available from the following address:

National Fire Protection Association

1 Battery March Park

Quincy, MA 02269

NOTE: This furnace is designed for a minimum continuous return air temperature of 60°F (16°C) or an intermitent operation down to 55°F (13°C) dry blub for cases where a night setback thermostat is used. Return air temperature must not exceed 85°F (29°C)dry bulb.

In Canada, all electrical wiring and grounding for the unit must be installed according to the current regulations of the Canadian Electrical Code Part I (CSA Standard C22.1) and/or local codes.

CAUTION

Do Not set thermostat below 60° F (16° C) in heating mode. Setting thermostat below 60° F (16° C) reduces the number of heating cycles. Damage to the unit may occur that is not covered by the warranty.

The A97USMV furnace may be installed in alcoves, closets, attics, basements, garages, crawl spaces and utility rooms.

This furnace design has not been CSA Certified for installation in mobile homes, recreational vehicles, or outdoors.

Use of Furnace as Construction Heater

These units are not recommended for use as a construction heater during any phase of construction. Very low return air temperature, harmful vapors and operation of the unit with clogged or misplaced filters will damage the unit.

These units may be used for heating of buildings or structures under construction, if the following conditions are met:

• The vent system must be permanently installed per these installation instructions.

• A room thermostat must control the furnace. The use of fixed jumpers that will provide continuous heating is not allowed.

• The return air duct must be provided and sealed to the furnace.

• Return air temperature range between 60°F (16°C) and

80°F (27°C) must be maintained.

• Air filters must be installed in the system and must be maintained during construction.

507028-03 Issue 1622 Page 5 of 74

• Air filters must be replaced upon construction completion.

• The input rate and temperature rise must be set per the furnace rating plate.

• One hundred percent (100%) outdoor air must be provided for combustion air requirements during construction.

• The furnace heat exchanger, components, duct system, air filters and evaporator coils must be thoroughly cleaned following final construction cleanup.

• All furnace operating conditions (including ignition, input rate, temperature rise and venting) must be verified according to these installation instructions.

• When the furnace is installed in an attic or other insulated space, keep insulation away from the furnace.

• When the furnace is installed in an unconditioned space, consider provisions required to prevent freezing of condensate drain system.

Installation – Setting Equipment

WARNING

Do not install the furnace on its front or its back. See

Figure 4.

General

WARNING

The State of California has determined that this product may contain or produce a chemical or chemicals, in very low doses, which may cause serious illness or death. It may also cause cancer, birth defects or other reproductive harm.

WARNING

Do not connect the return air ducts to the back of the furnace. Doing so will adversely affect the operation of the safety control devices, which could result in personal injury or death.

CAUTION

These units should not be installed in areas normally subject to freezing temperatures.

These instructions are intended as a general guide and do not supersede local codes in any way. Consult authorities having jurisdiction before installation.

In addition to the requirements outlined previously, the following general recommendations should be considered when installing one of these furnaces:

• Place the furnace as close to the center of the air distribution system as possible. The furnace should also be located close to the vent termination point.

Upflow Applications

This gas furnace can be installed as shipped in the upflow position. Refer to Figure 10 for clearances.

Select a location that allows for the required clearances that are listed on the unit nameplate. Also consider gas supply connections, electrical supply, vent connection, condensate trap and drain connections, and installation and service clearances (24 inches [610 mm] at unit front). The unit must be level from side to side, for proper operation. It is recommended to tilt the unit slightly toward the drain to insure proper drainage. See Figure 5.

Figure 4

Page 6 of 74 Issue 1622 507028-03

SETTING EQUIPMENT

UNIT MUST BE LEVEL SIDE TO SIDE IN ALL APPLICATIONS FOR PROPER OPERATION.

A SLIGHT TILT TOWARD THE DRAIN IS RECOMMENDED FOR PROPER DRAINAGE.

TILT THE UNIT SLIGHTLY (MAX. 1/2”) FROM BACK TO FRONT TO AID IN THE DRAINING OF THE HEAT EXCHANGER.

Figure 5

507028-03 Issue 1622 Page 7 of 74

Side Return Air

(with transition and filter)

Removing the Bottom Panel

Remove the two screws that secure the bottom cap to the furnace. Pivot the bottom cap down to release the bottom panel. Once the bottom panel has been removed, reinstall the bottom cap. See Figure 7.

Removing the Bottom Panel

Figure 6

A97USMV applications which include side return air and a condensate trap installed on the same side of the cabinet

(trap can be installed remotely within 5 feet) require either a return air base or field fabricated transition to accommodate an optional IAQ accessory taller than 14.5”. See Figure 6.

Optional Return Air Base

(Upflow Applications Only)

Figure 7

FRONT VIEW SIDE VIEW

1

NOTE: Optional side return air filter kits are not for use with return air base.

Both the unit return air opening and the base return air opening must be covered by a single plenum or IAQ cabinet.

Minimum unit side return air opening dimensions for units requiring 1800 cfm or more of air (W x H): 23 x 11 in. (584 x 279 mm).

The opening can be cut as needed to accommodate plenum or IAQ cabinet while maintaining dimensions shown.

Side return air openings must be cut in the field. There are cutting guides stenciled on the cabinet for the side return air opening.

The size of the opening must not extend beyond the markings on the furnace cabinet.

² To minimize pressure drop, the largest opening height possible (up to 14 inches) is preferred.

Figure 8

Page 8 of 74 Issue 1622 507028-03

NOTE: Units with 1/2 hp blower motor are equipped with three flexible legs and one rigid leg. The rigid leg is equipped with a shipping bolt and a flat white plastic washer (rather than the rubber mounting grommet used with a flexible mounting leg).

See Figure 9. The bolt and washer must be removed before the furnace is placed into operation.

After the bolt and washer have been removed, the rigid leg will not touch the blower housing.

Units with 1/2 HP

Blower Motor

Installation Clearances

Figure 9

Allow for clearances to combustible materials as indicated on the unit nameplate. Minimum clearances for closet or alcove installations are shown in Figure 10.

WARNING

Blower access panel must be securely in place when blower and burners are operating. Gas fumes, which could contain carbon monoxide, can be drawn into living space resulting in personal injury or death.

WARNING

Improper installation of the furnace can result in personal injury or death. Combustion and flue products must never be allowed to enter the return air system or air in the living space. Use sheet metal screws and joint tape to seal return air system to furnace.

In platform installations with furnace return, the furnace should be sealed airtight to the return air plenum. A door must never be used as a portion of the return air duct system. The base must provide a stable support and an airtight seal to the furnace. Allow absolutely no sagging, cracks, gaps, etc.

For no reason should return and supply air duct systems ever be connected to or from other heating devices such as a fireplace or stove, etc. Fire, explosion, carbon monoxide poisoning, personal injury and/or property damage could result.

* Front clearance in alcove installation must be 24 in. (610 mm).

Maintain a minimum of 24 in. (610 mm) for front service access.

† Allow proper clearances to accommodate condensate trap installation.

‡ For installations on a combustible floor, do not install the furnace directly on carpeting, tile or other combustible materials other than wood flooring.

Figure 10

Return Air – Upflow Units

Return air can be brought in through the bottom or either side of the furnace installed in an upflow application. If the furnace is installed on a platform with bottom return, make an airtight seal between the bottom of the furnace and the platform to ensure that the furnace operates properly and safely. The furnace is equipped with a removable bottom panel to facilitate installation.

Markings are provided on both sides of the furnace cabinet for installations that require side return air. Cut the furnace cabinet at the maximum dimensions shown on page 2.

507028-03 Issue 1622 Page 9 of 74

Setting and Upflow Unit

When the side return air inlets are used in an upflow application, it may be necessary to install shims on the bottom of the furnace.

Horizontal Applications

The A97USMV furnace can be installed in horizontal applications with either right or left hand air discharge.

Refer to Figure 11 for clearances in horizontal applications.

Horizontal Application

Installation Clearances

Right-Hand Discharge

NOTE: Heavy gauge sheet metal straps may be used to suspend the unit from roof rafters or ceiling joists. When straps are used to suspend the unit in this way, support must be provided for both the ends. The straps must not interfere with the plenum or exhaust piping installation.

Cooling coils and supply and return air plenums must be supported separately.

NOTE: When the furnace is installed on a platform in a crawlspace, it must be elevated enough to avoid water damage and to allow the evaporator coil to drain.

Typical Horizontal Application

Figure 12

* Front clearance in alcove installation must be 24 in. (610 mm).

Maintain a minimum of 24 in. (610 mm) for front service access.

** An 8” service clearance must be maintained below the unit to provide for servicing of the condensate trap. Unless the trap is mounted remotely.

‡ For installations on a combustible floor, do not install the furnace directly on carpeting, tile or other combustible materials other than wood flooring.

Figure 11

Suspended Installation of Horizontal Unit

This furnace may be installed in either an attic or a crawlspace. Either suspend the furnace from roof rafters or floor joists, as shown in Figure 12 or install the furnace on a platform, as shown in Figure 13. A horizontal suspension kit (51W10) may be ordered or use equivalent.

Platform Installation of Horizontal Unit

1. Select location for unit keeping in mind service and other necessary clearances. See Figure 11.

2. Construct a raised wooden frame and cover frame with a plywood sheet. If unit is installed above finished space, fabricate an auxiliary drain pan to be installed under unit.

Set unit in drain pan as shown in Figure 13. Leave 8 inches for service clearance below unit for condensate trap, unless trap is installed remotely.

3. Provide a service platform in front of unit. When installing the unit in a crawl space, a proper support platform may be created using cement blocks.

4. Route auxiliary drain line so that water draining from this outlet will be easily noticed by the homeowner.

5. If necessary, run the condensate line into a condensate pump to meet drain line slope requirements. The pump must be rated for use with condensing furnaces. Protect the condensate discharge line from the pump to the outside to avoid freezing.

6. Continue with exhaust, condensate and intake piping installation according to instructions.

Page 10 of 74 Issue 1622 507028-03

* Gas Connector may be used for Canadian installation if acceptable by local authority having jurisdiction.

Figure 13

Return Air - Horizontal Applications

Return air must be brought in through the end of a furnace installed in the horizontal position. The furnace is equipped with a removable bottom panel to facilitate installation. See

Figure 7.

Filters

This unit is not equipped with a filter or rack. A field provided filter is required for the unit to operate properly. Table 1 lists recommended filter sizes.

A filter must be in place when the unit is operating!

NOTE: In upflow applications where side return air filter is installed on same side as the condensate trap, make sure that clearance is maintained to ensure future access to the filter access panel.

Duct System

Use industry approved standards to size and install the supply and return air duct system. This will result in a quiet and low static system that has uniform air distribution.

NOTE: Operation of this furnace in heating mode (indoor blower operating at selected heating speed) with an external static pressure which exceeds 0.8 inches w.c. may result in erratic limit operation.

Supply Air Plenum

If the furnace is installed without a cooling coil, a removable access panel should be installed in the supply air duct. The access panel should be large enough to permit inspection

(by reflected light) of the heat exchanger for leaks after the furnace is installed. If present, this access panel must always be in place when the furnace is operating and it must not allow leaks into or from the supply air duct system.

Return Air Plenum

Return air must not be drawn from a room where this furnace, or any other gas fueled appliance (i.e., water heater), or carbon monoxide producing device (i.e., wood fireplace) is installed. When return air is drawn from a room, a negative pressure is created in the room. If a gas appliance is operating in a room with negative pressure, the flue products can be pulled back down the vent pipe and into the room. This reverse flow of the flue gas may result in incomplete combustion and the formation of carbon monoxide gas. This toxic gas might then be distributed throughout the house by the furnace duct system.

Return air can be brought in through the bottom or either side of the furnace. If a furnace with bottom return air is installed on a platform, make an airtight seal between the bottom of the furnace and the platform to ensure that the unit operates properly and safely. Use fiberglass sealing strips, caulking, or equivalent sealing method between the plenum and the furnace cabinet to ensure a tight seal. If a filter is installed, size the return air duct to fit the filter frame.

Table 1

507028-03 Issue 1622 Page 11 of 74

Pipe and Fittings Specifications

All pipe, fittings, primer and solvent cement must conform with American National Standard Institute and the American

Society for Testing and Materials (ANSI/ASTM) standards.

The solvent shall be free flowing and contain no lumps, undissolved particles or any foreign matter that adversely affects the joint strength or chemical resistance of the cement. The cement shall show no gelation, stratification, or separation that cannot be removed by stirring. Refer to

Table 2 for approved piping and fitting materials.

PIPING AND FITTINGS SPECIFICATIONS

Schedule 40 PVC (Pipe)

Schedule 40 PVC (Cellular Core Pipe)

Schedule 40 PVC (Fittings)

Schedule 40 CPVC (Pipe)

Schedule 40 CPVC (Fittings)

SDR-21 PVC or SDR-26 PVC (Pipe)

SDR-21 CPVC or SDR-26 CPVC (Pipe)

Schedule 40 ABS Cellular Core DWV

(Pipe)

Schedule 40 ABS (Pipe)

Schedule 40 ABS (Fittings)

ABS-DWV (Drain Waste & Vent)

(Pipe & Fittings)

PVC-DWV (Drain Waste & Vent)

Pipe & Fittings)

D1785

F891

D2466

F441

F438

D2241

F442

F628

D1527

D2468

D2661

D2665

PRIMER & SOLVENT CEMENT

PVC & CPVC Primer

PVC Solvent Cement

CPVC Solvent Cement

ABS Solvent Cement

PVC/CPVC/ABS All Purpose Cement For

Fittings & Pipe of the same material

ABS to PVC or CPVC Transition Solvent

Cement

CANADA PIPE & FITTING & SOLVENT

CEMENT

PVC & CPVC Pipe and Fittings

PVC & CPVC Solvent Cement

ABS to PVC or CPVC Transition Cement

POLYPROPYLENE VENTING SYSTEM

PolyPro® by Duravent

InnoFlue® by Centrotherm

ASTM

SPECIFICATION

F656

D2564

F493

D2235

D2564, D2235,

F493

D3138

MARKING

ULCS636

ULC-S636

ULC-S636

Table 2

CAUTION

Solvent cements for plastic pipe are flammable liquids and should be kept away from all sources of ignition.

Do not use excessive amounts of solvent cement when making joints. Good ventilation should be maintained to reduce fire hazard and to minimize breathing of solvent vapors. Avoid contact of cement with skin and eyes.

IMPORTANT

The exhaust and intake connections are made of PVC.

Use PVC primer and solvent cement when using PVC vent pipe. When using ABS vent pipe, use transitional solvent cement to make connections to the PVC fittings in the unit.

Use PVC primer and solvent cement or ABS solvent cement meeting ASTM specifications, refer to Table 2. As an alternate, use all purpose cement, to bond ABS, PVC, or

CPVC pipe when using fittings and pipe made of the same materials. Use transition solvent cement when bonding ABS to either PVC or CPVC.

Low temperature solvent cement is recommended. Metal or plastic strapping may be used for vent pipe hangers.

Uniformly apply a liberal coat of PVC primer for PVC.

Canadian Applications Only – Pipe, fittings, primer and solvent cement used to vent (exhaust) this applicance must be certified to ULCS636 and supplied by a single manufacturer as part of an approved vent (exhaust) system.

In addition, the first three feet of vent pipe from the furnace flue collar must be accessible for inspection.

Table 3 lists the available exhaust termination kits, as well as vent pipe equivalencies which must be used when sizing vent pipe.

Page 12 of 74 Issue 1622 507028-03

A97USMV

070

090

110

135

2

2-1/2

3

2

2-1/2

3

2

2-1/2

3

3

VENT PIPE

DIA.

(in.)

OUTDOOR TERMINATION KITS USAGE

STANDARD

Outdoor Exhaust Accelerator

(Dia. X

Length)

Outdoor

Exhaust

Accelerator

(Dia. X

Length)

Flush

Mount

Kit

1-1/2”

Concentric

Kit

1-1/2” X 12”

YES

YES

YES

2” X 12” 51W11 *

71M80 or

+44W92++

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

CONCENTRIC

2”

Concentric

Kit

69M29 or

+44W92++

YES

YES

YES

YES

YES

YES

3”

Concentric

Kit

60L46 or 44W93+

YES

YES

YES

YES

YES

YES

YES

* Kit 51W11 is provided with a 1-1/2” accelerator which must be for all 2 and 2-1/2” PVC installations.

+ Termination kits 44W92 and 44W93 are approved for use in Canadian installations to meet CSAB149.

++ The 44W92 Concentric kit is provided with a 1-1/2” accelerator Which must be installed on the exhaust outlet

when this kit is used with this furnace.

Table 3

Joint Cementing Procedure

All cementing of joints should be done according to the specifications outlined in ASTM D2855.

DANGER

6. Promptly apply solvent cement to end of pipe and inside socket surface of fitting. Cement should be applied lightly but uniformly to inside of socket. Take care to keep excess cement out of socket. Apply second coat to end of pipe.

507028-03

DANGER OF EXPLOSION!

Fumes from PVC glue may ignite during system check.

Allow fumes to dissipate for at least 5 minutes before placing unit into operation.

1. Measure and cut vent pipe to desired length.

2. Debur and chamfer end of pipe, removing any ridges or rough edges. If end is not chamfered, edge of pipe may remove cement from fitting socket and result in a leaking joint.

3. Clean and dry surfaces to be joined.

4. Test fit joint and mark depth of fitting on outside of pipe.

5. Uniformly apply a liberal coat of PVC primer for PVC or use a clean dry cloth for ABS to clean inside socket surface of fitting and male end of pipe to depth of fitting socket.

NOTE: Time is critical at this stage. Do not allow primer to dry before applying cement.

7. Immediately after applying last coat of cement to pipe, and while both inside socket surface and end of pipe are wet with cement, forcefully insert end of pipe into socket until it bottoms out. Turn PVC pipe 1/4 turn during assembly (but not after pipe is fully inserted) to distribute cement evenly. core pipe.

NOTE:

DO NOT turn ABS or cellular

Assembly should be completed within 20 seconds after last application of cement. Hammer blows should not be used when inserting pipe.

Issue 1622

8. After assembly, wipe excess cement from pipe at end of fitting socket. A properly made joint will show a bead around its entire preimeter. Any gaps may indicate a defective asembly due to insufficient solvent.

9. Handle joints carefully until completely set.

Page 13 of 74

Venting Practices

Piping Suspension Guidelines

NOTE: Isolate piping at the point where it exits the outside wall or roof in order to prevent transmission of vibration to the structure.

Wall Thickness Guidelines

1. In areas where piping penetrates joist or interior walls, hole must be large enough to allow clearance on all sides of pipe through center of hole using a hanger.

2. When furnace is installed in a residence where unit is shut down for an extended period of time, such as a vacation home, make provisions for draining condensate collection from trap and lines.

Exhaust Piping (Figures 18 and 19)

3. Route piping to outside of structure. Continue with installation following instructions given in piping termination section.

CAUTION

Do not discharge exhaust into an existing stack or stack that also serves another gas appliance. If vertical discharge through an existing unused stack is required, insert PVC pipe inside the stack until the end is even with the top or outlet end of the metal stack.

Figure 14

CAUTION

The exhaust vent pipe operates under positive pressure and must be completely sealed to prevent leakage of combustion products into the living space.

If this gas furnace replaces a furnace which was commonly vented with another gas appliance, the size of the existing vent pipe for that gas appliance must be checked. Without the heat of the original furnace flue products, the existing vent pipe is probably oversized for the single water heater or other appliance. The vent should be checked for proper draw with the remaining appliance.

Figure 15

Page 14 of 74

Vent Piping Guidelines

This unit is installed only as a Direct Vent gas central furnace.

NOTE: In Direct Vent installations, combustion air is taken from outdoors and flue gases are discharged outdoors.

Intake and exhaust pipe sizing – Size pipe according to

Tables 4 and 5. Table 4 lists the minimum vent pipe lengths permitted. Table 5 lists the maximum pipe lengths permitted.

Regardless of the diameter of pipe used, the standard roof and wall terminations described in section Exhaust Piping

Terminations should be used. Exhaust vent termination pipe is sized to optimize the velocity of the exhaust gas as it exits the termination. Refer to Table 6.

In some applications which permit the use of several different sizes of vent pipe, a combination vent pipe may be used.

Contact Allied Air Technical Service for more information concerning sizing of vent systems which include multiple pipe sizes.

Use the steps in Figure 17 to correctly size vent pipe diameter.

Issue 1622 507028-03

EXHAUST PIPE

Horizontal Application

NOTE: All horizontal runs of exhaust pipe must slope back toward unit.

A minimum of 1/4” (6 mm) drop for each 12” (305 mm) of horizontal run is mandatory for drainage.

NOTE: Exhaust pipe MUST be glued to furnace exhaust fittings.

NOTE : Exhaust piping should be checked carefully to make sure there are no sags or low spots.

Figure 16

NOTE: T he exhaust collar on all models is sized to accommodate 2” Schedule 40 vent pipe. In horizontal applications, transition to exhaust pipe larger than 2” must be made in vertical runs of the pipe. A 2” elbow must be added before the pipe is transitioned to any size larger than

2”. This elbow must be added to the elbow count used to determine acceptable vent lengths. Contact Allied Air

Technical Service for more information concerning sizing of vent systems which include multiple pipe sizes.

IMPORTANT

Do not use screens or perforated metal in exhaust or intake terminations. Doing so will cause freeze-ups and may block the terminations.

MINIMUM VENT PIPE LENGTHS

* Any approved termination may be added to the minimum equivalent length listed.

Table 4

507028-03 Issue 1622

Figure 17

Page 15 of 74

Maximum Allowable Intake or Exhaust Vent Length (feet)

Page 16 of 74

Table 5

Issue 1622 507028-03

Maximum Allowable Intake or Exhaust Vent Length (feet)

*Size intake and exhaust pipe length separately. Values in table are for intake or exhaust not combined total. Both intake and exhaust must be same pipe size.

507028-03

Table 5


TYPICAL EXHAUST PIPE CONNECTIONS AND CONDENSATE TRAP INSTALLATION

IN UPFLOW APPLICATIONS

Figure 18

TYPICAL EXHAUST PIPE CONNECTIONS AND CONDENSATE TRAP INSTALLATION

IN HORIZONTAL AIR APPLICATIONS

(RIGHT HAND DISCHARGE SHOWN)

Page 18 of 74

Figure 19

Issue 1622 507028-03

VENT TERMINATION CLEARANCES

FOR DIRECT VENT INSTALLATiONS IN THE USA AND CANADA

507028-03

Figure 20


General Guidelines for Vent Terminations

In Direct Vent applications, combustion air is taken from outdoors and the flue gases are discharged to the outdoors.

This gas furnace is classified as a direct vent, Category IV gas furnace.

In Direct Vent applications, the vent termination is limited by local building codes. In the absence of local codes, refer to the current National Fuel Gas Code ANSI Z223-1/NFPA 54 in U.S.A., and current CSA-B149 Natural Gas and Propane

Installation Codes in Canada for details.

Position termination according to location given in Figure

20. In addition, position termination so it is free from any obstructions and 12” above the average snow accumulation.

At vent termination, care must be taken to maintain protective coatings over building materials (prolonged exposure to exhaust condensate can destroy protective coatings). It is recommended that the exhaust outlet not be located within 6 feet (1.8m) of a condensing unit because the condensate can damage the painted coating.

NOTE: See Table 6 for maximum allowed exhaust pipe length without insulation in unconditioned space during winter design temperatures below 32 ° F (O ° C) . If equired exhaust pipe should be insulated with 1 / 2 ” (13mm)

Armaflex or equivalent . In extreme cold climate areas ,

3 / 4 ” (19mm) Armaflex or equivalent may be necessary .

Insulation on outside runs of exhaust pipe must be painted or wrapped to protect insulation from deterioration . Exhaust pipe insulation may not be necessary in some specific applications .

IMPORTANT

Do not use screens or perforated metal in exhaust terminations. Doing so will cause freeze-ups and may block the terminations.

IMPORTANT

FOR CANADIAN INSTALLATIONS ONLY:

In accorddance to CSA International B149 installation codes, the minimum allowed distance between the combustion air intake inlet and the exhaust outlet of other appliances shall not be less than 12 inches (305 mm).

Maximum Allowable Vent pipe Length without Insulation in Unconditioned Space for Winter Design

Temperatures Modulating High Efficiency Furnace

Winter Design Temperatures 1

ºF (ºC)

Vent Pipe

Diameter

32 to 21

(0 to -6)

20 to 1

(-7 to -17)

0 to -20

(-18 to -29)

2 in.

2-1/2 in.

3 in.

2 in.

2-1/2 in.

3 in.

2 in.

2-1/2 in.

3 in.

PVC

070

11

2 PP PVC

9 14

090

2 PP PVC

12 18

110

2 PP PVC

15

135

2 PP

N/A N/A

7 N/A

N/A N/A

10

6

N/A

6

12

8

N/A

8

N/A

13

N/A

13

N/A N/A 6 4 8 6 N/A N/A

N/A N/A N/A N/A N/A N/A N/A N/A





1

2

Refer to 99% Minimum Design Temperature table provided in the current edition of the ASHRAE Fundamentals Handbook.

Poly-Propylene vent pipe (PP) by Duravent and Centrotherm

NOTE - Concentric terminations are the equivalent of 5’ and should be considered when measuring pipe length.

NOTE- Maximum uninsulated vent lengths listed may include the termination (vent pipe exterior to the structure ) and cannot exceed 5 linear feet or the maximum allowable intake or exhaust vent length listed in table 5 or 6.

NOTE - If insulation is required an unconditioned space, it must be located on the pipe closed to the furnace.

Table 6

Page 20 of 74 Issue 1622 507028-03

Field Supplied Wall Terminator or

(15F74) Wall Ring Termination Kit

See venting Table 5 for maximum venting lengths with this arrangement.

* Use wall support every 24” (610 mm). Use two wall supports if extension is greater than 24” (610 mm) but less than 48” (1219 mm).

NOTE: One wall support must be 6” (152 mm) from top of each pipe

(intake and exhaust).

507028-03

Figure 24


FIELD SUPPLIED WALL TERMINATION with INTAKE ELBOW

EXHAUST PIPE TERMINATION SIZE REDUCTION

See venting Table 5 for maximum venting lengths with this arrangement.

* Use wall support every 24” (610 mm). Use two wall supports if extension is greater than 24” (610 mm) but less than 48” (1219 mm).

NOTE: One wall support must be 6” (152 mm) from top of each pipe

(intake and exhaust).

* 070 and 090 units installed with flush mount termination must use the 1-1/2” accelerator supplied with the kit.

Table 7

5. On field supplied terminations for sidewall exit, exhaust piping may extend a maximum of 12 inches (305 mm) for 2” PVC and 20 inches (508 mm) for 3” (76 mm) PVC beyond the outside wall. Intake piping should be as short as possible. See Figures 22 and 23.

6. On field supplied terminations, a minimum distance between the end of the exhaust pipe and the end of the intake pipe without a termination elbow is 8” and a minimum distance of 6” with a termination elbow. See

Figures 22 and 23.

7. If intake and exhaust piping must be run up a side wall to position above snow accumulation or other obstructions, piping must be supported every 24” (610 mm) as shown in Figures 22 and 23. In addition, close coupled wall termination must be extended for use in this application. See Figures 22 and 23. When exhaust and intake piping must be run up an with pipe sized per

Table 7. The intake piping may be equipped with a 90° elbow turndown. Using turndown will add 5 feet (1.5 m) to the equivalent length of the pipe.

DIRECT VENT CONCENTRIC ROOFTOP TERMINATION

71M80, 69M29 or 60L46 (US)

44W92 or 44W93 (Canada)

Page 22 of 74

Figure 25

Issue 1622

Figure 26

507028-03

DIRECT VENT CONCENTRIC WAL TERMINATION

71M80, 69M29 OR 60L46 (US)

44W92 or 44W93 (Canada)

FLUSH-MOUNT SIDE WALL TERMINATION

51W11

Figure 25

Figure 26

507028-03

Figure 27


DIRECT VENT APPLICATION

USING EXISTING CHIMNEY

NOTE: Do not discharge exhaust gases directly into any chimney or vent stack. If vertical discharge through an existing unused chimney or stack is required, insert piping inside chimney until the pipe open end is above top of chimney and terminates as illustrated. In any exterior portion of chimney, the exhaust vent must be insulated.

Figure 30

Condensate Piping

This unit is designed for either right or left side exit of condensate piping in upflow applications. In horizontal applications, the condensate trap must extend below the unit. An 8” service clearance is required for the condensate trap. Refer to Figure 34 for condensate trap locations.

NOTE: If necessary the condensate trap may be installed up to 5 ft. away using PVC pipe from the furnace. Piping from furnace must slope down a minimum of 1/4” per ft. toward trap.

CONDENSATE TRAP AND PLUG LOCATIONS

(Unit shown in upflow position)

1. Determine which side condensate piping will exit the unit, location of trap, field-provided fittings and length of PVC pipe required to reach available drain.

2. Use a 1/2” rachet drive or flat blade screw driver and remove plug (Figure 31) from the cold end header box at the appropriate location on the side of the unit. Install field-provided 3/4 NPT male fitting into cold end header box. Use Teflon tape or appropriate pipe dope.

3. Install the cap over the clean out opening at the base of the trap. Secure with clamp. See Figure 38.

4. Install drain trap using appropriate PVC fittings, glue all joints. Glue the provided drain trap as shown in

Figure 38. Route the condensate line to an open drain.

Condensate line must maintain a 1/4” downward slope from the furnace to the drain .

5. Figures 33 and 34 show the furnace and evaporator coil using a separate drain. If necessary the condensate line from the furnace and evaporator coil can drain together.

See Figures 35, 36 and 37.

Upflow furnace (Figure 32) - In upflow furnace applications the field provided vent must be minimum

1” to a maximum 2” length above the condensate drain outlet connection. Any length above 2” may result in a flooded heat exchanger if the combined primary drain line were to become restricted.

Horizontal furnace (Figure 33 or 37) In horizontal furnace applications the field provided vent must be a minimum

4” to a maximum 5” length above the condensate drain outlet connection. Any length above 5” may result in a flooded heat exchanger if the combined primary drain line were to become restricted.

NOTE: In horizontal applications it is recommended to install a secondary drain pan underneath the unit and trap assembly.

6. If unit will be started immediately upon completion of installation, prime trap per procedure outlined in Unit

Start-Up section.

NOTE: In upflow applications where side return air filter is installed on same side as the condensate trap, filter rack MUST be installed beyond condensate trap or trap must be relocated to avoid interference.

Figure 31

Page 24 of 74 Issue 1622

Condensate line must slope downward away from the trap to drain. If drain level is above condensate trap, condensate pump must be used. Condensate drain line should be routed within the conditioned space to avoid freezing of condensate and blockage of drain line. If this is not possible, a heat cable kit may be used on the condensate trap and line.

Heating cable kit is available in various lengths; 6 ft. (1.8 m) - kit no. 26K68; 24 ft. (7.3 m) - kit no. 26K69; and 50 ft.

(15.2 m) - kit no. 26K70.

CAUTION

Do not use copper tubing or existing copper condensate lines for drain line.

507028-03

CONDENSATE TRAP LOCATIONS

(Unit shown in upflow position with remote trap)

Figure 32

A97USMV With Evaporator Coil Using a Separate Drain

(Unit shown in horizontal Left hand discharge position )

507028-03

Evaporator Coil Using A Separate Drain

Figure 33

CAUTION

A separate drain line must be run to the drain from the condensate trap. DO NOT connect the condensate trap drain into the drain line from the evaporator coil.

Figure 34


IMPORTANT

When combining the furnace and evaporator coil drains together, the A/C condensate drain outlet must be vented to relieve pressure in order for the furnace pressure switch to operate properly.

Condensate Trap with Optional Overflow Switch

Evaporator Coil using a Common Drain

Figure 36

Figure 35

Evaporator Coil using a Common Drain

(Unit shown in Horizontal Left-Hand Discharge Position)

Page 26 of 74

Figure 37

Issue 1622 507028-03

TRAP / DRAIN ASSEMBLY USING 1/2” PVC OR 3/4” PVC

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

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

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507028-03 Issue 1622 Page 27 of 74

Gas Piping

CAUTION

If a flexible gas connector is required or allowed by the authority that has jurisdiction, black iron pipe shall be installed at the gas valve and extend outside the furnace cabinet. The flexible connector can then be added between the black iron pipe and the gas supply line.

IMPORTANT

Compounds used on threaded joints of gas piping must be resistant to the actions of liquified petroleum gases.

WARNING

Do not exceed 600 in.-lbs. (50 ft.-lbs.) torque when attaching the gas piping to the gas valve.

1. Gas piping may be routed into the unit through either the left or right hand side in upflow applications, and either the top or bottom in horizontal applications. Supply piping enters into the gas valve from the side of the valve as shown in Figures 36 and 37.

2. When connecting gas supply, factors such as length of run, number of fittings and furnace rating must be considered to avoid excessive pressure drop. Table 7 list recommended pipe sizes for typical applications.

NOTE: Use two wrenches when connecting gas piping to avoid transferring torque to the manifold.

3. Gas piping must not run in or through air ducts, clothes chutes, chimneys or gas vents, dumb waiters or elevator shafts. Center gas line through piping hole. Gas line should not touch side of unit. See Figures 36 and 37.

4. Piping should be sloped 1/4 “ per 15 feet (6 mm per 5.6 m) upward toward the gas meter from the furnace. The piping must be supported at proper intervals, every 8 to 10 feet (2.44 to 3.05 m), using suitable hangers or straps. Install a drip leg in vertical pipe runs to serve as a trap for sediment or condensate.

5. A 1/8” N.P.T. plugged tap or pressure post is located on the gas valve to facilitate test gauge connection. See

Figure 42.

6. In some localities, codes may require installation of a manual main shut off valve and union (furnished by installer) external to the unit. Union must be of the ground joint type.

Figure 35

Leak Check

After gas piping is completed, carefully check all piping connections (factory and field installed) for gas leaks. Use a leak detecting solution or other preferred means. Do not test with open flame

The furnace must be isolated from the gas supply system by closing its individual manual shut-off valve during any pressure testing of the gas supply system at pressures more than or equal to 1/2 psig (3.48 kPa, 14 inches w.c.).

IMPORTANT

When testing gas lines using pressures in excess of

1/2 psig (3.48kPa), gas valve must be disconnected and isolated. See Figure 35. Gas valves can be damaged if subjected to pressures greater than 1/2 psig (3.48 kPa).

WARNING

FIRE OR EXPLOSION HAZARD

Failure to follow the safety warnings exactly could result in serious injury, death, or property damage.

Never use an open flame to test for gas leaks. Check all connections using a commercially available soap solution made specifically for leak detection. Some soaps used for leak detection are corrosive to certain metals. Carefully rinse piping thoroughly after leak test has been completed.

Page 28 of 74 Issue 1622 507028-03

NOTE: BLACK IRON PIPE ONLY TO BE ROUTED INSIDE OF CABINET

Figure 36

Horizontal Applications

Possible Gas Piping Configurations

507028-03

NOTE: BLACK IRON PIPE ONLY TO BE ROUTED INSIDE OF CABINET

Figure 37


Removal of the Furnace from Common Vent

In the event that an existing furnace is removed from a venting system commonly run with separate gas appliances, the venting system is likely to be too large to properly vent the remaining attached appliances.

Conduct the following test while each appliance is operating and the other appliances (which are not operating) remain connected to the common venting system. If the venting system has been installed improperly, you must correct the system as indicated in the general venting requirements section.

WARNING

CARBON MONOXIDE POISONING HAZARD

Failure to follow the steps outlined below for each appliance connected to the venting system being placed into operation could result in carbon monoxide poisoning or death.

The following steps shall be followed for each appliance connected to the venting system being placed into operation, while all other appliances connected to the venting system are not in operation:

1. Seal any unused openings in the common venting system.

2. Inspect the venting system for proper size and horizontal pitch. Determine that there is no blockage, restriction, leakage, corrosion, or other deficiencies which could cause an unsafe condition.

3. Close all building doors and windows and all doors between the space in which the appliances remaining connected to the common venting system are located and other spaces of the building. Turn ON clothes dryers and any appliances not connected to the common venting system. Turn ON any exhaust fans, such as range hoods and bathroom exhausts, so they will operate at maximum speed. Do not operate a summer exhaust fan. Close fireplace dampers.

4. Follow the lighting instructions. Turn ON the appliance that is being inspected. Adjust the thermostat so that the appliance operates continuously.

5. After the main burner has operated for 5 minutes, test for leaks of flue gases at the draft hood relief opening.

Use the flame of a match or candle.

6. After determining that each appliance connected to the common venting system is venting properly, (step

3) return all doors, windows, exhaust fans, fireplace dampers, and any other gas burning appliances to their previous mode of operation.

7. If a venting problem is found during any of the preceding tests, the common venting system must be modified to correct the problems.

Resize the common venting system to the minimum vent pipe size determined by using the appropriate tables in the current standards of the National Fuel Gas Code

ANSI Z223.1.

GAS PIPE CAPACITY - FT³/HR (kL/HR)

NOTE: Capacity given in cubic feet of gas per hour (kilo liters of gas per hour) and based on 0.60 specific gravity gas.

Table 7

Page 30 of 74 Issue 1622 507028-03

Electrical

ELECTROSTATIC DISCHARGE (ESD)

Precautions and Procedures

CAUTION

Electrostatic discharge can affect electronic components.

Take precautions during furnace installation and service to protect the furnace’s electronic controls. Precautions will help to avoid control exposure to electrostatic discharge by putting the furnace, the control and the technician at the same electrostatic potential. Neutralize electrostatic charge by touching hand and all tools on an unpainted unit surface, such as the gas valve or blower deck, before performing any service procedure.

The unit is equipped with a field makeup box. The makeup box may be moved to the right side of the furnace to facilitate installation. If the makeup box is moved to the right side, clip the wire ties that bundle the wires together. The excess wire must be pulled into the blower compartment. Secure the excess wire to the existing harness to protect it from damage. Seal unused openings on left side with plugs removed from right side.

1. The power supply wiring must meet Class I restrictions.

Protected by either a fuse or circuit breaker, select circuit protection and wire size according to unit nameplate.

NOTE: Unit nameplate states maximum current draw. See table for maximum over-current protection.

INTERIOR MAKE-UP BOX INSTALLATION

Figure 38

INTERIOR MAKE-UP BOX INSTALLATION

Table 8

2. Holes are on both sides of the furnace cabinet to facilitate wiring.

3. Install a separate (properly sized) disconnect switch near the furnace so that power can be turned off for servicing.

4. Before connecting the thermostat check to make sure the wires will be long enough for servicing at a later date.

Make sure that the thermostat wire is long enough to facilitate future removal of blower for service.

5. Complete the wiring connections to the equipment. Use the provided unit wiring diagram and the field wiring diagram shown in Figure 40 and Table 11. Use 18 gauge wire or larger that is suitable for Class II rating for thermostat connections.

6. Electrically ground the unit according to local codes or, in the absence of local codes, according to the current

National Electric Code (ANSI/HFPA No. 70) for the

USA and current Canadian Electric Code Part 1 (CSA standard C22.1) for Canada. A green ground wire is provided in the field makeup box.

7. One line voltage “EAC” 1/4” spade terminal is provided on the furnace integrated control. Any electronic air cleaner or other 120V accessory rated up to one amp can be connected to this terminal with the neutral leg of the circuit being connected to one of the provided neutral terminals. See Figure 45 for location of terminal.

This terminal is energized when the indoor blower is operating.

Figure 39

507028-03 Issue 1622 Page 31 of 74

8. One line voltage “HUM” 1/4” spade terminal is provided on the furnace integrated control. Any humidifier or other 120V accessory rated up to one amp can be connected to this terminal with the neutral leg of the circuit being connected to one of the provided neutral terminals. See Figure 41 for location of terminal. This terminal is energized in the heating mode when the indoor blower is operating.

9. One 24V “H” terminal is provided on the furnace integrated control terminal block. Any humidifier rated up to 0.5 amp can be connected to this terminal with the ground leg of the circuit being connected to either ground or the “C” terminal. See Figure 41 for location of terminal.

10. Install the room thermostat according to the instructions provided with the thermostat. See Table 11 for thermostat connections. If the furnace is being matched with a heat pump, refer to the instruction packaged with the dual fuel thermostat.

Run Length – Non Communicating

Table 9

Thermostat Selection

A Comfort Sync™ thermostat must be used in comunicating applications. Refer to the instructions provided with the thermostat for installation, set-up and operation.

This unit is designed to operate in a variable rate capacity mode using a two-stage thermostat. This unit will automatically adjust firing rate based upon thermostat cycle times.

For optimal performance use a high quality electronic digital thermostat or any other with adjustable settings for 1st stage

/ 2nd stage on / off differentials and adjustable stage timers.

The following is a two-stage thermostat setup for optimal variable rate capacity mode:

First heat stage differential set to 1/2 to 1° F; second heat stage differential set to 1/2 or 1° F; second heat stage upstage timer disabled, or set to maximum (1 hr. minimum).

Indoor Blower Speeds

1. When the thermostat is set to “FAN ON”, the indoor blower will run continuously at a percentage of the second stage cooling speed when there is no cooling or heating demand.

2. When the unit is running in the heating mode, the integrated control will automatically adjust the blower speed to match the furnace firing rate. This speed can be adjusted up or down by 7.5% or 15% using DIP switches 14 through 16 for the low heat speed and 17 through 19 for the high heat speed.

3. When there is a cooling demand, the indoor blower will run on the cooling speed designated by the positions of

DIP switches 8 through 11.

Generator Use - Voltage Requirements

The following requirements must be kept in mind when specifying a generator for use with this equipment:

• The furnace requires 120 volts ± 10% (Range: 108 volts to 132 volts).

• The furnace operates at 60 Hz ± 5% (Range: 57 Hz to

63 Hz).

• The furnace integrated control requires both polarity and proper ground. Both polarity and proper grounding should be checked before attempting to operate the furnace on either permanent or temporary power.

• Generator should have a wave form distortion of less than 5% THD (Total Harmonic Distortion).

Page 32 of 74 Issue 1622 507028-03

Typical A97USMV Field Wiring Diagram for Standard Non-Communicating Thermostat

Figure 44

507028-03 Issue 1622 Page 33 of 74

Page 34 of 74

Figure 45

Issue 1622 507028-03

507028-03

Figure 46


Field Wiring Connections for Non-Communicating Thermostat Applications

*”R” required on some units.

Page 36 of 74

Table 12A

Issue 1622 507028-03

Field Wiring for Non-Communicating Applications (continued)

* “R” required on some units.

507028-03

Table 12B



* Connect W1 to W1 ONLY if using defrost tempering kit 67M41.

NOTE: Do NOT make a wire connection between the room thermolstat L terminal and the L terminal of the A97USMV integrated control.

Table 12C

Page 38 of 74 Issue 1622 507028-03

Typical A97USMV Wiring Diagram

507028-03

Figure 47


Integrated Control

COMBUSTION

AIR INDUCER

CONNECTOR

FLAME

SENSE

DIAGNOSTIC

PUSH BUTTON

DIP SWITCHES

NEUTRAL

TERMINALS

IGNITOR

CONNECTOR

LINE VOLTAGE

TERMINALS

HUM

EAC

OUTDOOR AIR

SENSOR

TERMINALS

FACTORY TEST

HEADER PINS.

DISCHARGE AIR

SENSOR

TERMINALS

FACTORY USE ONLY.

TB83 OUTDOOR

TB84 INDOOR

RS-BUS LINK (TB82, future use)

I+ = DATA HIGH CONNECTION

I - = DATA LOW CONNECTION

RS-BUS OUTDOOR (TB83)

R = 24VAC

I + = DATA HIGH CONNECTION


C = 24VAXC COMMON

RS-BUS INDOOR (TB84)

R = 24VAC

I + = DATA HIGH CONNECTION


C = 24VAXC COMMON

1/4” QUICK CONNECT TERMINALS

HUM = 120 VAC OUTPUT TO HUMIDIFIER

XMFR = 120 VAC OUTPUT TO TRANSFORMER

LI = 120 VAC INPUT TO CONTROL

CIRC = 120 VAC OUTPUT TO CIRCULATING BLOWER

EAC = 120 VAC OUTPUT TO ELECTRICAL AIR CLEANER

NEUTRALS = 120 VAC NEUTRAL

7-SEGMENT

DIAGNOSTIC LED

W915

W951

W914

INDOOR

BLOWER

CONNECTOR

W915 Y1 TO Y2

W951 R TO O

W914 R TO DS

L - use only with communicating T'stat and non-communicating outdoor unit.

THERMOSTAT CONNECTIONS (TB1)

DS = DEHUMIDIFICATION SIGNAL

W2 = HEAT DEMAND FROM 2ND STAGE T/STAT

W1 = HEAT DEMAND FROM 1ST STAGE T/STAT

R = CLASS 2 VOLTAGE TO THERMOSTAT

G = MANUAL FAN FROM T'STAT

C = THERMOSTAT SIGNAL GROUND CONNECTED TO

TRANSFORMER GRD (TR) & CHASIS GROUND (GRD)

Y1 = THERMOSTAT 1ST STAGE COOL SIGNAL

Y2 = THERMOSTAT 2ND STAGE COOL SIGNAL

O = THERMOSTAT SIGNAL TO HEAT PUMP

REVERSING VALVE

H = 24V HUMIDIFIER OUTPUT. DO NOT CONNECT

TO COMFORTSENSE ® THERMOSTAT

L = USE ONLY WITH A COMMUNICATING

THERMOSTAT AND A NON-COMMUNICATING

OUTDOOR UNIT

DH = DEHUMIDIFICATION OUTPUT

COMMUNICATING THERMOSTAT ONLY

Figure 48

Page 40 of 74 Issue 1622 507028-03

8. One line voltage “HUM” 1/4” spade terminal is provided on the furnace integrated control. Any humidifier or other 120V accessory rated up to one amp can be connected to this terminal with the neutral leg of the circuit being connected to one of the provided neutral terminals. See Figure 41 for location of terminal. This terminal is energized in the heating mode when the indoor blower is operating.

9. One 24V “H” terminal is provided on the furnace integrated control terminal block. Any humidifier rated up to 0.5 amp can be connected to this terminal with the ground leg of the circuit being connected to either ground or the “C” terminal. See Figure 41 for location of terminal.

10. Install the room thermostat according to the instructions provided with the thermostat. See Table 11 for thermostat connections. If the furnace is being matched with a heat pump, refer to the instruction packaged with the dual fuel thermostat.

Run Length – Non Communicating

Table 13

Thermostat Selection

This unit is designed to operate in a variable rate capacity mode using a two-stage thermostat. This unit will automatically adjust firing rate based upon thermostat cycle times.

For optimal performance use a high quality electronic digital thermostat or any other with adjustable settings for 1st stage

/ 2nd stage on / off differentials and adjustable stage timers.

The following is a two-stage thermostat setup for optimal variable rate capacity mode:

First heat stage differential set to 1/2 to 1° F; second heat stage differential set to 1/2 or 1° F; second heat stage upstage timer disabled, or set to maximum (1 hr. minimum).

Indoor Blower Speeds

1. When the thermostat is set to “FAN ON”, the indoor blower will run continuously at a percentage of the second stage cooling speed when there is no cooling or heating demand.

2. When the unit is running in the heating mode, the integrated control will automatically adjust the blower speed to match the furnace firing rate. This speed can be adjusted up or down by 7.5% or 15% using DIP switches 14 through 16 for the low heat speed and 17 through 19 for the high heat speed.

3. When there is a cooling demand, the indoor blower will run on the cooling speed designated by the positions of

DIP switches 8 through 11.

Generator Use - Voltage Requirements

The following requirements must be kept in mind when specifying a generator for use with this equipment:

• The furnace requires 120 volts ± 10% (Range: 108 volts to 132 volts).

• The furnace operates at 60 Hz ± 5% (Range: 57 Hz to

63 Hz).

• The furnace integrated control requires both polarity and proper ground. Both polarity and proper grounding should be checked before attempting to operate the furnace on either permanent or temporary power.

• Generator should have a wave form distortion of less than 5% RHD.

507028-03 Issue 1622 Page 41 of 74

Thermostat Selection Switch Settings

Table 15

These units are equipped with an integrated control. This control manages ignition timing, combustion air inducer speed, heating mode fan OFF delays and indoor blower speeds based on selections made using the control DIP switches and onboard links. The control includes an internal feature which automatically resets the ignition control when it has been locked out.

NOTE: All DIP switches are factory shipped in the “OFF” position.

Heating Operation DIP Switch Settings - Figure 41

Switch 1 - Thermostat Selection - This unit may be used with either a single stage or two stage thermostat. The thermostat selection is made using a DIP switch which must be properly positioned for the particular application. The

DIP switch is factory positioned for use with a two stage thermostat. If a single stage thermostat is to be used, the

DIP switch must be repositioned. See Table 12.

Switch 2 - Operating Mode with Two Stage Thermostat

If a two stage thermostat is used, the furnace can operate in either variable capacity or conventional two stage mode.

When variable capacity mode is selected, the firing rate of the unit is varied to maximize comfort. Conventional two stage mode is the factory default setting. See Table 12.

Switch 3 - Second Stage Heat On Delay - If a single stage thermostat is used, the integrated control can be used to energize second stage heat after either 7 minutes or 12 minutes of first stage heat operation. See Table 12.

Switches 4 and 5 - Blower Off Delay The blower On delay of 30 seconds is not adjustable. The blower Off delay (time that the blower operates after the heating demand has been satisfied) can be adjusted by moving switches 4 and 5 on the integrated control. The unit is shipped from the factory with a blower Off delay of 90 seconds. The blower Off delay affects comfort and is adjustable to satisfy individual applications. Adjust the blower Off delay to achieve a supply air temperature between 90° and 110° F at the exact moment that the blower is de-energized. Longer Off delay settings provide lower supply air temperatures; shorter settings provide higher supply air temperatures. Table 13 provides the blower Off timings that will result from different switch settings.

Blower Off Delay Switch Settings

Table 16

Indoor Blower Operation DIP Switch Settings

Switches 6 and 7 - Continuous Indoor Fan Operation -

Blower Speed - The unit is shipped from the factory with the DIP switches positioned for medium low (38%) speed during continuous indoor blower operation. Continuous fan setting is 38% of cool setting and is not adjustable.

Page 42 of 74 Issue 1622 507028-03

T h e rm o s ta t

1 H e a t / 1 C o o l

N O T E - U s e D IP s w itc h 3 to s e t s e c o n d -s ta g e h e a t O N d e la y .

O F F -7 m in u te s .

O N -1 2 m in u te s .

D IP S w itc h S e ttin g s a n d O n -B o a rd L in k s (fig u re N O T A G )

D IP S w itc h 1 W 9 1 5

(Y 1 to Y 2 )

T w o -S ta g e

C o o lin g

W 9 1 4

(D S to R )

D e h u m id ific a tio n o r

H a rm o n y III

£

W 9 5 1

(O to R )

H e a t P u m p s

O N In ta c t In ta c t In ta c t

S1

T’STAT

W irin g C o n n e c tio n s

CONTROL

TERM. STRIP

OUTDOOR

UNIT

*

1 H e a t / 2 C o o l



O N -1 2 m in u te s .

S1

T’STAT

CONTROL

TERM. STRIP

OUTDOOR

UNIT

*

1 H e a t / 2 C o o l w ith t’s ta t w ith d e h u m id ific a tio n m o d e



O N -1 2 m in u te s .

O N C u t C u t In ta c t

S1

T’STAT

CONTROL

TERM. STRIP

OUTDOOR

UNIT

*

50 702 8-01

507028-03

Issue 123 5

Issue 1622

Page 37 of 78

Page 43 of 74

Low Voltage Field Wiring


T h e rm o s ta t

D IP S w itc h S e ttin g s a n d O n -B o a rd L in k s (fig u re N O T AG )

D IP S w itc h 1 W 9 1 5

(Y 1 to Y 2 )

T w o -S ta g e

C o o lin g

W 9 1 4

(D S to R )

D e h u m id ific a tio n o r

H a rm o n y

III

£

W 9 5 1

(O to R )

H e a t P u m p s

2 H e a t / 2 C o o l O F F C u t In ta c t In ta c t

S1

T’STAT

W irin g C o n n e c tio n s

CONTROL

TERM. STRIP

OUTDOOR

UNIT

*

2 H e a t / 2 C o o l w ith t’s ta t w ith d e h u m id ific a tio n m o d e

O F F C u t C u t In ta c t

S1

T’STAT

CONTROL

TERM. STRIP

OUTDOOR

UNIT

*

2 H e a t / 1 C o o l O F F In ta c t In ta c t In ta c t

S1

T’STAT

CONTROL

TERM. STRIP

OUTDOOR

UNIT

*

Page 38 of 78

Page 44 of 74

Issue 123 5

Issue 1622

50 702 8-01

507028-03

Thermostat

Dual Fuel

Single Stage

Heat Pump thermostat w/dual fuel capabilities

Capable of

2 stage gas heat control

DIP Switch 1

OFF

Low Voltage Field Wiring

Single Stage

DIP Switch Settings & On Board Links (Figure 41)

DIP Switch W915

(Y1 to Y2)

Two Stage

Cooling

W914

(DS to R)

Dehumidification

W951

(O to R)

Heat Pumps

Intact Intact Cut

Thermostat

Dual Fuel

Two Stage

Heat Pump thermostat w/dual fuel capabilities

Capable of

2 stage gas heat control

2 Stage

DIP Switch Settings & On Board Links (Figure 41)

DIP Switch W915

(Y1 to Y2)

Two Stage

Cooling

W914

(DS to R)

Dehumidification

W951

(O to R)

Heat Pumps

DIP Switch 1

OFF

Cut Intact Cut

507028-03

Table 14


Switches 8 and 9 - Cooling Mode Blower Speed-

The unit is shipped from the factory with the DIP switches positioned for high speed (4) indoor blower motor operation during the cooling mode. The table below provides the cooling mode blower speeds that will result from different switch settings.

Cooling Mode Blower Speeds

Cooling Mode Blower Speed Ramping

Table 19

Ramping Option “A” (Factory Selection)

• Motor runs at 50% for 30 seconds.

• Motor then runs at 82% for approximately 7-1/2 min utes.

• If demand has not been satisfied after 7-1/2 minutes, motor runs at 100% until demand is satisfied.

• Once demand is met, motor runs at 50% for 30 seconds then ramps down to stop.

Table 17

Switches 10 and 11 - Cooling Mode Blower Speed

Adjustment - The unit is shipped from the factory with the DIP switches positioned for NORMAL (no) adjustment.

The DIP switches may be positioned to adjust the blower speed by +10% or -10% to better suit the application. Table

18 provides blower speed adjustments that will result from different switch settings. Refer to air flow tables for values.

With switches 10 an 11 set to ON, motor will bypass ramping profiles and all delays and will immediately run at selected

COOLING speed upon a call for cool. LED will continue to operate as normal. This mode is used to check motor operation.

Cooling Mode Blower Speed Adjustment

Ramping Option “B”

•

•

Motor runs at 82% for approximately 7-1/2 minutes.

If demand has not been satisfied after 7-1/2 minutes, motor runs at 100% until demand is satisfied.

Once demand is met, motor ramps down to stop.

Table 18

Switches 12 and 13 - Cooling Mode Blower Speed

Ramping Blower speed ramping may be used to enhance dehumidification performance. The switches are factory set at option A which has the greatest effect on blower motor performance. Table 19 provides the cooling mode blower speed ramping options that will result from different switch settings. The cooling mode blower speed ramping options are detailed below.

NOTE: The OFF portion of the selected ramp profile only applies during heat pump operation in dual fuel applications.

Ramping Option “C”

• Motor runs at 100% until demand is satisfied.

• Once demand is met, motor runs at 100% for 45 seconds then ramps down to stop.

Ramping Option “D”

• Motor runs at 100% until demand is satisfied.

• Once demand is met, motor ramps down to stop.

Page 46 of 74 Issue 1622 507028-03

Switches 14 through 19 - Heating Mode Blower Speed

These switches are factory set at the OFF position which provides 100% of normal speed during HIGH HEAT demand,

70% of normal speed during MIDRANGE HEAT demand and

40% of normal speed during LOW HEAT demand. Switches

14, 15 and 16 are used to adjust the LOW HEAT blower motor speed. Switches 17, 18 and 19 are used to adjust the HIGH HEAT blower motor speed. Table 18 provides the heating mode blower speeds that will result from different switch settings.

Low Heat Blower Speeds

Table 20

High Heat Blower Speeds

Table 21

On Board Links

On Board links must be clipped (when applicable) before unit is placed into operation with a non-communicating thermostat.

On Board Link W914 DS to R (Figure??)

On Board link W914, is a clippable connection between terminals DS and R on the integrated control. W914 must be cut when installed with a thermostat which features humidity control. Refer to Table ?? for operation sequence in applications for this unit, a thermostat which features humidity control and a single speed outdoor unit. Table

?? gives the operation sequence in applications with a two speed outdoor unit.

On Board Link W951 R to O (Figure ??)

On Board link W951 is a clippable connection between terminals R and O on the integrated control. W951 must be cut when the furnace is installed in applications which include a heat pump unit and thermostat which features dual fuel use. If the link is left intact, terminal “O” will remain energized eliminating the HEAT MODE in the heat pump.

On Board Link W915 Y1 to Y2 (Figure ??)

On Board linkW915 si a clippable connection between terminals Y1 and Y2 on the integrated control. W915 must be cut if two stage cooling will be used. If the link is not cut the outdoor unit will operate in second stage cooling only.

Diagnostic LED (Figure ??)

The seven segment diagnostic LED displays operating status, target airflow, error codes and other information.

The table on page 58 lists diagnostic LED codes.

Diagnostic Push Button (Figure ??)

The diagnostic push button is located adjacent to the seven segment diagnostic LED. This button is used to enable the

Error Code Recall mode and the Field Test mode. Press the button and hold it to cycle through a menu of options. Every five seconds a new menu item will be displayed. When the button is released, the displayed item will be selected.

Once all items in the menu have been displayed, the menu resumes from the beginning until the button is released.

Error Code Recall Mode

Select “E: from the menu to access the most recent 10 error codes. Select “c” from the Error Code Recall menu to clear all error codes. Button must be pressed a second time while

“c” is flashing to confirm command to delete codes. Press the button until a solid “-” is displayed to exit the Error Code

Recall mode.

Field Test Mode

Use the diagnostic push button to scroll through the menu as described above. Release the button when the LED flashes “-” to select the Field Test mode.

While in the Field Test mode the technician can:

• Initiate furnace ignition and move to and hold low-fire rate by applying a R to W1 jumper.

• Initiate furnace ignition sequence and move to an hold high-fire rate by applying a jumper from R to W1 and

W2.

• Initiate furnace ignition sequence and move to and hold mid-fire rate by applying a jumper to R and W2.

• Apply then remove the jumper from R to W1 and W2 to change the firing rate from low fire to mid fire and high fire.

• A vent calibration sequence can be initiated even if a thermostat signal is not present. Press and hold the push button until a solid “C” is displayed. Release the button and calibration will begin. The furnace will perform the high-fire and low-fire pressure switch calibrations and display “CAL”. After calibration , the

LED will return to the flashing “-” display.

During Field Test mode operation, all safety switches are still in the circuit (they are not by-passed) and indoor blower performance and timings will match DIP switch selections.

Current furnace firing rate, indoor blower CFM and flame signal will be displayed. To exit the Field Test mode, press and hold the button. The menu will resume from the beginning. Also, cycle the main power to exit the Field Test mode. The integrated control will automatically exit the Field

Test mode after 45 minutes of operation

507028-03 Issue 1622 Page 47 of 74

A96UHMV070B12S BLOWER PERFORMANCE (less filter)

HEATING BLOWER PERFORMANCE

BOTTOM RETURN AIR

BLOWER DATA

Heating Adjust CFM Selections

Increase (+15%) Heat CFM

Increase (+7.5%) Heat CFM

Default Heat CFM

Decrease (-7.5% ) Heat CFM

Decrease (-15% ) Heat CFM

COOLING BLOWER PERFORMANCE

40%

538

496

453

419

385

Heating Input Range and Blower Volume - CFM

50%

636

60%

735

70%

833

80%

931

588

539

498

458

680

624

578

531

772

710

657

604

864

796

736

676

90%

1030

956

881

815

749

100%.

1128

1048

967

895

822

Cooling Adjust CFM

Selections

First Stage Cool Speed- cfm

Low

Medium

Low

740 Increase (+10%) Cool CFM

Default Cool CFM

Decrease(-10%) Cool CFM

600

555

500


RIGHT SIDE RETURN AIR


665

600

Medium

High

840

770

680

Blower Speed Selections

High

(Default)

970

855

790

Low

860

810

705

Second Stage Cool Speed-cfm

Medium

Low

1060

960

840

Medium

High

1215

1130

1005

High

(Default)

1365

1265

1140


Increase (15%) Heat CFM


Default Heat CFM

Decrease (-7.5%) Heat CFM

Decrease(-15%) Heat CFM


40%

531

490

449

413

378


50% 60% 70% 80% 90%

625

579

718

667

812

756

906

845

999

933

533

487

442

616

561

506

700

635

571

784

709

635

867

783

699

100%

1093

1022

951

857

763

Cooling Adjust CFM

Selections

Increase (+10%) Cool CFM

Default Cool CFM

Decrease (-10%) Cool CFM

Low

590

540

500



Medium Medium High

Low

Low

705

High

805

(Default)

955 840


Medium Medium

Low

1050

High

1205

High

(Default)

1355

640

580

725

665

820

720

750

685

945

805

1130

990

1230

1110

The effect of static pressure is included in air volumes shown.

The following control configurations are available. See Installation Instructions for details and DIP switch settings.

Heat Modes Available (Heating Blower Performance Table):

Single stage thermostat:

- 40%, 70%. 100% input (three-stage) with time delays in-between

Two-stage thermostat:

- Variable Rate Capacity Mode - furnace automatically adjusts firing rate based on first- and second-stage cycle times

- W1 demand at 70% input, W2 demand at 100% input. No delay between stages

Cool Mode Available (Cooling Blower Performance table):

First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position,

Continuous Fan speeds are approximately 38% of the same second-stage COOL speed position minimum 300 cfm.

Page 48 of 74 Issue 1622 507028-03

BLOWER DATA


RIGHT SIDE RETURN AIR WITH OPTIONAL RETURN AIR BASE



Increase (+15%) Heat CMS

Increase (-7.5%) Heat CFM

Default Heat CFM




Cooling Adjust CFM

Selections

40%

519

480

441

408

375


50% 60% 70% 80% 90%

614

570

526

486

446

709

660

611

564

517

805

751

696

643

589

900

841

781

721

660

996

931

866

799

732

1

1091

1021

951

877

803

Low


First Stage Cool Speed- cfm Second Stage Cool Speed-cfm

Medium

Low

Medium

High

High

(Default)

Low Medium

Low

Medium

High

High

(Default)


Default Cool CFM


585

520

490

715

655

595

815

755

670

950

840

745

855

790

720

1045

945

845

1205

1090

985

1350

1255

1130

A96UHMV090C12S BLOWER PERFORMANCE (less filter) BOT -

TOM RETURN AIR HEATING

BLOWER PERPORMANCE


40%


50% 60% 70% 80% 90% 100%



Default Heat CFM

Decrease(-7.5% ) Heat CFM

734

697

660

616

572

827

792

737

687

637

821

867

814

757

701

1014

953

891

828

788

1108

1038

968

899

830

1201

1123

1045

970

895

1295

1209

1122

1041

959 Decrease (-15% ) Heat CFM


Cooling Adjust CFM

Selections


Default Cool CFM


Low

625

565

520

Medium

Low

710

670

610

Medium

High

830

760

685



High

(Default)

950

860

785

Low

875

800

720


Medium

Low

1040

945

840

Medium

High

1210

1100

970












High

(Default)

1380

1240

1115

507028-03 Issue 1622 Page 49 of 74

BLOWER DATA

A96UHMV090C12S BLOWER PERFORMANCE (less filter)





40%

702

50%

792

Heating Input Range and Blower Volume- CFM

60%

881

70%

971

80%

1061

90%

1150

100%

1240


Default Heat CFM




Cooling Adjust CFM

Selections

673

644

608

571

757

723

676

630

841

802

745

689

926

880

814

747

1010

959

882

806

1094

1037

951

864

1178

1116

1020

923

Low

First Stage Cool Speed-cfm

Medium Medium

Low High


High

(Default)

Low


Medium Medium

Low High

High

(Default)


Default Cool CFM

610

560

705

640

795

715

920

810

840

770

1015

910

1165

1050

1300

1190



525 605

A96UHMV090C123 BLOWER PERFORMANCE (less filter) RIGHT

SIDE RETURN AIR WITH OPTIONAL RETURN AIR BASE HEAT -

ING BLOWER PERFORMANCE

40%

665

50%

725

60%

695

70%

795


80%

945

90%

1110

100%



Default Heat CFM




Cooling Adjust CFM

Selections

721

678

637

606

576

810

760

711

673

635

899

842

784

740

695

988

923

858

806

754

1076

1004

932

873

814

1165

1085

1005

939

873

1254

1167

1079

1006

933


Default Cool CFM

Low

605

570




Medium Medium High Low Medium Medium

Low

715

660

High

810

735

(Default)

930

820

850

775

Low

995

905

High

1165

1050

Decrease (-10%) Cool CFM 530 600 670 725 710 800 945












High

(Default)

1305

1205

1070

Page 50 of 74 Issue 1622 507028-03

BLOWER DATA


BOTTOM RETURN AIR




40%

835

Heating Input Range and Blower Volume- CFM

50%

968

60%

1101

70%

1234

80%

1367

90%

1500

1

1633


Default Heat CFM




Cooling Adjust CFM

Selections

Low

776

716

652

589

902

836

767

699

First Stage Cool Speed-cfm

Medium

Low

Medium

High

1028

955

882

809

1155

1075

997

919


High

(Default)

Low

1281

1195

1112

1029

1407

1314

1227

1139


Medium

Low

Medium

High

1534

1434

1342

1249

High

(Default)


Default Cool CFM

840

780

Low

1005

915

1155

1045

1315

1190

1165

1075

1375

1265

1580

1440

1770

1645

Decrease (-10%) Cool CFM 1320







Default Heat CFM



690 835

40%

812

759

706

644

582

955


50%

943

882

821

755

690

1070

60%

1073

1005

936

867

797

935

70%

1204

1127

1051

978

905

1145

80%

1334

1250

1165

1089

1013

90%

1465

1372

1280

1200

1120

1465

100%

1595

1495

1395

1312

1228


Cooling Adjust CFM

Selections First Stage Cool Speed- cfm

Medium

Low

Medium

High


High

(Default)

Low


Medium

Low

Medium

High

High

(Default)


Default Cool CFM

820

755

1005

880

1135

1025

1290

1150

1140

1040

1340

1235

1525

1395













1725

1565

1400

507028-03 Issue 1622 Page 51 of 74

BLOWER DATA




Heating Adjust CFM Selections Heating input Range and Blower Volume - CFM



Default Heat CFM

Decrease (-7.5%)’Heat CFM

Decrease (-15%) Heat CFM


40%

828

766

703

650

596

50%

956

888

819

762

704

60%

1084

1010

936

874

812

70%

1213

1132

1052

986

921

80%

1341

1255

1168

1099

1029

90%

1469

1377

1285

1211

1137

100%

1597

1499

1401

1323

1245

Cooling Adjust CFM

Selections

Low



Medium Medium High Low Medium Medium High increase (+10%) Cool CFM

Default Cool CFM


840

775

695

Low

955

910

815

High

1120

1010

930

(Default)

1280

1170

1045

1160

1060

925

Low

1360

1240

1130

High

1530

1400

1295

(Default)

1740

1590

1440


BOTTOM RETURN AIR




40%

665

Heating input Range and Blower Volume - CFM

50%

830

60%

995

70%

1159

80%

1324

90%

1488

100%

1653

Increase (+7,5%) Heat CFM

Default Heat CFM




Cooling Adjust CFM

Selections

618

571

507

443

774

718

644

570

930

865

781

697

1085

1012

917

823

1241

1159

1054

950

1397

1306

1191

1076

1553

1453

1328

1203 increase (+10%) Cool CFM

Default Cool CFM

Low

933

836


Medium Medium

Low High

High

(Default)

1054 1274 1466

978 1121


1336

Low

1385

1226


Medium Medium High

Low

1593

1463

High

1818

1647

(Default)

2019

1884













1675

Page 52 of 74 Issue 1622 507028-03

BLOWER DATA







Default Heat CFM




40%

684

623

562

502

441


50%

835

769

702

633

564

60%

986

914

842

765

687

70%

1136

1059

953

896

810

80%

1287

1205

1123

1028

932

90%

1437

1350

1263

1159

1055

100%

1588

1496

1403

1291

1178

Cooling Adjust CFM

Selections

Low


Medium

Low

Medium

High


High

(Default)

Low


Medium

Low

Medium

High

High

(Default) increase (+10%) Cool CFM

Default Cool CFM

911

805

Low

1043

960

1227

1087

1434

1296

1335

1173

1559

1433

1719

1568

1986

1811




1451

A96UHMV090C20S BLOWER PERFORMANCE (less fil ter) RIGHT SIDE RETURN AIR WITH OPTIONAL RETURN

AIR BASE HEATING BLOWER PERFORMANCE




Default Heat CFM


700 840

40%

686

626

566

502

437

991


50%

837

771

705

633

560

1115

60%

987

916

844

764

683

1049

70%

1138

1060

983

895

806

1283

80%

1288

1205

1121

1026

930

90%

1439

1349

1260

1157

1053

1603

100%

1589

1494

1399

1288

1176

Cooling Adjust CFM

Selections


Medium

Low

Medium

High


High

(Default)

Low


Medium

Low

Medium

High

High

(Default)

1982

1807


Default Cool CFM

913

827

1037

953

1230

1088

1415

1278

1329

1177

1560

1414

1740

1586













507028-03 Issue 1622 Page 53 of 74

Unit Start Up

FOR YOUR SAFETY READ BEFORE OPERATING

WARNING

Do not use this furnace if any part has been underwater.

A flood damaged furnace is extremely dangerous.

Attempts to use the furnace can result in fire or explosion.

Immediately call a qualified service technician to inspect the furnace and to replace all gas controls, control system parts, and electrical parts that have been wet or to replace the furnace, if deemed necessary.

WARNING

Danger of explosion. Can cause injury or product or property damage. Should the gas supply fail to shut off or if overheating occurs, shut off the gas valve to the furnace before shutting off the electrical supply.

BEFORE PLACING THE UNIT INTO OPERATION

Smell all around the furnace area for gas. Be sure to smell next to the floor because some gas is heavier than air and will settle on the floor.

The gas valve on these units are equipped with a gas control switch. Use only your hand to move the control switch.

Never use tools. If the switch will not move by hand, do not try to repair it. Force or attempted repair may result in a fire or explosion.

Placing the Furnace into Operation:

These units are equipped with an automatic ignition system.

Do not attempt to manually light burners on this furnace.

Each time the thermostat calls for heat, the burners will automatically light. The ignitor does not get hot when there is no call for heat on units with this ignition system.

WARNING

If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or death.

CAUTION

Before attempting to perform any service or maintenance, turn the electrical power to unit OFF at disconnect switch.

WARNING

During blower operation, the ECM motor emits energy that may interfere with pacemaker operation.

Interference is reduced by both the sheet metal cabinet and distance.

Priming Condensate Trap

The condensate trap should be primed with water prior to startup to ensure proper condensate drainage. Either pour

10 fl. oz. (300 ml) of water into the trap, or follow these steps to prime the trap:

1. Follow the lighting instructions to place the unit into operation.

2. Set the thermostat to initiate a heating demand.

3. Allow the burners to fire for approximately 3 minutes.

4. Adjust the thermostate to deactivate the heating demand.

5. Wait for the combustion air inducer to stop. Set the thermostat to initiate a heating demand and again allow the burners to fire for approximately 3 minutes.

6. Ajust the thermostat to deactivate the heating demand and again wait for the combustion air inducer to stop.

At this point, the trap should be primed with sufficient water to ensure proper condensate drain operation.

Page 54 of 74 Issue 1622

Gas Valve Operation (Figure 49)

1. STOP!

Read the safety information at the beginning of this sectioin.

2. Set the thermostat to the lowest setting.

3. Turn all electrical power to the unit.

4. This furnace is equipped with an ignition device which automatically lights the burners. DO NOT try to light the burners by hand.

5. Remove the access panel.

6. Move the gas valve switch to the OFF position. See

Figure 42.

7. Wait five minutes to clear out any gas. If you then smell gas, STOP!

Immediately call the gas supplier from a neighbor’s phone. Follow the gas supplier’s instructions. If you do not smell gas go to the next step.

8. Move gas valve switch to the ON position. See Figure

42. DO Not force.

Figure 49

507028-03

9. Replace the access panel.

10. Turn on all electrical power to the unit.

11. Set the thermostat to desired setting.

NOTE: When unit is initially started, steps 1 through 11 may need to be repeated to purge air from gas line.

12. If the Appliance will not operate, follow the instructions

“Turning Off Gas to Unit” and call the gas supplier.

Turning Off Gas to Unit

1. Set the thermostat to the lowest settling.

2. Turn all electrical power to the unit if service is to be performed.

3. Remove the access panel.

4. Move the gas valve switch to the OFF position.

5. Replace the access panel.

Failure To Operate

If the unit fails to operate, check the following:

1. Is the thermostat calling for heat?

2. Are access panels securely in place?

3. Is the main disconnect switch closed?

4. Is there a blown fuse?

5. Is the filter dirty or plugged? Dirty or plugged filters will cause the limit conrol to shut the unit off.

6. Is gas turned on at the meter?

7. Is the manual main shut Off valve open?

8. Is the gas valve turned on?

9. Is the unit ignition system in lock out: If the unit locks out again, inspect the unit for blockages.

10. Is blower harness connected to ignition control?

Furnace will not operate unless harness is connected.

Gas Pressure Measurement

Gas Flow (Approximate)

NOTE: To obtain accurate reading, shut off all other gas appliances connected to meter.

Supply Pressure Measurement

A threaded plug on the inlet side of the gas valve provides access to the supply pressure tap. Remove the threaded plug, install a field provided barbed fitting and connect a manometer to measure supply pressure. Replace the threaded plug after measurements have been taken.

Manifold Pressure Measurement

To correctly measure manifold pressure, the differential pressure between the positive gas manifold and the negative burner box must be considered. Use pressure test adapter kit (available as part 10L3) to assist in measurement.

1. Remove the threaded plug from the outlet side of the gas valve and install a field provided barbed fitting.

Connect test gauge “+” connection to barbed fitting to measure manifold pressure.

2. Tee into the gas valve regulator vent hose and connect test gauge “-” connection.

3. Start unit on low heat (40% rate) and allow 5 minutes for unit to reach steady state.

4. While waiting for the unit to stabilize, notice the flame.

Flame should be stable and should not lift from burner.

Natural gas should burn blue.

5. After allowing unit to stabilize for 5 minutes, record manifold pressure and compare to value given in Table

25.

6. Repeat steps 3, 4 and 5 on HIGH HEAT.

NOTE: Shut unit off and remove manometer as soon as an accurate reading has been obtained. Take care to remove barbed fitting and replace threaded plug.

CAUTION

DO NOT attempt to make adjustments to the gas valve.

Table 24

Furnace should operate at least 5 minutes before checking gas flow. Determine time in seconds for two revolutions of gas through the meter. (Two revolutions assures a more accurate time.) Divide by two and compare to time in

Table 21. If manifold pressure matches Table 24 and rate is incorrect, check gas orifices for proper size and restriction.

Remove temporary gas meter if installed.

NOTE: A natural to LP/propane gas changeover kit is necessary to convert this unit. Refer to the changeover kit installation instruction for the conversion procedure.

507028-03 Issue 1622

Operating Pressure Signal

Operating pressure signal can be taken while the manifold pressure check is taken (using two measuring devices). Or, taken after the manifold pressure measurement is complete.

1. Tee into the negative line between the gas valve and pressure switch and connect to measuring device negative “-”.

2. Tee into the positive line between the gas valve and pressure switch and connect to measuring device positive “+”.


4. After allowing unit to stabilize for 5 minutes, record operating pressure signal and compare to value given in Table 25.

5. Repeat steps 3 - 4 on high heat.

Page 55 of 74

Table 25

Manifold and Operating Signal Pressures in inches 0-7500 ft (0-2286 m)

NOTE: A natural to LP/propane gas changeover kit (Table 26) is necessary to convert this unit. Refer to the changeover kit installation instructions for the conversion procedure.

High Altitude Information

NOTE: In Canada, certification for installation at elevations over 4500 feet (1372 m) is the jurisidiction of local authorities.

These units require no manifold pressure adjustments for operation at altitudes up to 7,500 feet (2286 m) above sea level. Table 26 lists conversion kit requirements, pressure switch requirements and manifold pressures at all altitudes.

The combustion air pressure switch is factory set and requires no adjustment.

Model

Input

Size

Conversion Kit Requirements

LP/Propane

Kit

0 - 10,000

(0-3048 m)

High Altitude Pressure Switch Kit

0 - 7,500

(0 - 2286 m)

7,501 - 10,000

(2287 - 3048m)

70

90

110

135

68W77 Not required 14T65

Table 26

Proper Combustion

Furnace should operate a minimum of 15 minutes with correct manifold pressure and gas flow rate before checking combustion. Take combustion sample beyond the flue outlet and compare to the tables below. The maximum carbon monoxide reading should not exceed 100 ppm.

High Fire

Table 27

Low Fire

Table 28

Page 56 of 74 Issue 1622 507028-03

BLOWER DATA


BOTTOM RETURN AIR





Default Heat CFM




Cooling Adjust CFM

Selections

40%

861

825

789

731

673


50%

1049

1000

951

883

816

60%

1237

1174

1112

1035

958

70%

1424

1349

1274

1187

1101

80%

1612

1524

1436

1339

1243

90%

1800

1699

1597

1491

1386

100%

1988

1874

1759

1644

1528

Low



Medium

Low

Medium

High

High

(Default)

Low Medium

Low

Medium

High

High


Default Cool CFM

937

864

Low

1064

972

1247

1146

1407

1282

1312

1219

1560

1405

1744

1569

1955

1796




1428




Heating Adjust CFM

Selections



Default Heat CFM


790 888

40%

733

708

683

632

580

1025


50%

825

794

763

707

650

1167

60%

1009

967

924

857

790

1075

70%

1194

1139

1085

1007

929

1272

80%

1378

1312

1245

1157

1069

90%

1562

1484

1406

1307

1209

1634

100%

1747

1657

1566

1457

1348

Cooling Adjust CFM

Selections


Medium

Low

Medium

High


High

(Default)

Low


Medium

Low

Medium

High

High


Default Cool CFM


918

820

722

1053

964

852

1198

1095

987

1366

1231

1116

1270

1170

1059

1519

1363

1218

1712

1555

1401












1899

1774

1581

507028-03 Issue 1622 Page 57 of 74

BLOWER DATA




Heating Adjust CFM Selections Heating input Range and Blower Volume - CFM



Default Heat CFM




Cooling Adjust CFM

Selections

Low

40%

893

814

736

680

623


Medium

Low

50%

1068

986

903

833

762


Medium

High

60%

1243

1157

1071

986

901

High

(Default)

70%

1419

1329

1238

1139

1040

80%

1594

1500

1406

1293

1179

90%

1770

1672

1573

1446

1318


Low Medium

Low

Medium

High

100%

1945

1843

1741

1599

1457

High


Default Cool CFM

918

839

1022

955

1205

1084

1371

1235

1268

1158

1487

1369

1726

1568

1913

1764


A96UHMV135D20S BLOWER PERFORMANCE (less filter)

BOTTOM RETURN AIR


Heating Adjust CFM

Selections

760 865


40%

984

50%

1109

60%

1030

70%

1224

80%

1393

90%

1575

100%



Default Heat CFM




Cooling Adjust CFM

Selections

1033

957

881

817

753

1200

1113

1026

956

886

1367

1269

1172

1095

1019

1534

1426

1317

1235

1152

1701

1582

1463

1374

1284

1868

1738

1608

1513

1417

2035

1895

1754

1652


Default Cool CFM



Low

935

834

Medium

Low

1074

983

Medium

High

1260

1116

High

(Default)

1450

1306


Low Medium

Low

Medium

High

High

(Default)

1353

1202

1567

1448

1751

1616













1994

1828

1668

Page 58 of 74 Issue 1622 507028-03

Model

Input

Size

LP/Propane

Kit

0 - 10,000

(0 - 3048 m)

Conversion Kit Requirements and Manifold Test Pressures

High Altitude Pressure

Switch Kit

0 - 7,500

(0 - 2286 m)

7,501 - 10,000

(2287 - 3048 m)

Manifold Pressure at All Altitudes (In. w.g.)

High Fire

(100% rate)

Gas Orifice

Low Fire

(35% rate)

Natural Gas LP/Propane Natural Gas LP/Propane Nat

Size

LP

-070

-090

-110

-135

68W77 Not required 72W89 0.40 - 0.60

1.2 - 1.8

3.2 - 3.8

NOTE: The values given in table 23 are measurements only. The gas valve should not be adjusted.

9.5 - 10.5

.0625

.034

Table 24

Manifold Pressure Measurement

To correctly measure manifold pressure, the differential pressure between the positive gas manifold and the negative burner box must be considered. Use pressure test adapter kit (available as part 10L34) to assist in measurement.

Pressure Switches (Two)

The pressure switches are located on the cold end header box. These switches check for proper combustion air inducer operation before allowing ignition trial. The switches are factory set and require no adjustment.

1. Remove the threaded plug from the outlet side of the gas valve and install a field provided barbed fitting.

Connect test gauge “+” connection to barbed fitting to measure manifold pressure.

2. Tee into the gas valve regulator vent hose and connect test gauge “-” connection.


4. While waiting for the unit to stabilize, notice the flame.

Flame should be stable and should not lift from burner.

Natural gas should burn blue.

5. After allowing unit to stabilize for 5 minutes, record manifold pressure and compare to value given in Table

24.

6. Repeat steps 3, 4 and 5 on HIGH HEAT.

Temperature Rise

After the furnace has been started and supply and return air temperatures have been allowed to stabilize, check the temperature rise with the unit operating at 100 percent firing rate. If necessary, adjust the blower speed to maintain the temperture rise within the range shown on the unit nameplate. Increase the blower speed to decrease the temperature. Decrease the blower speed to increase the temperature. Decrease the blower speed to increase the temperature rise. Failure to adjust the temperature rise may cause erratic limit operation.

Thermostat Heat Anticipation

Set the heat anticipator setting (if adjustable) according to the amp draw listed on the wiring diagram that is attached to the unit.

NOTE: Shut unit off and remove manometer as soon as an accurate reading has been obtained. Take care to remove barbed fitting and replace threaded plug.

DO NOT

CAUTION

attempt to make adjustments to the gas valve.

Electronic Ignition

The integrated control has a feature that serves as an automatic reset device for ignition control lockout caused by ignition failure. This type of lockout is usually due to low gas line pressure. After one hour of continuous thermostat demand for heat, the control will break and remake thermostat demand to the furnace and automatically reset the control to begin the ignition sequence.

Other Unit Adjustments

Primary Limit

The primary limit is located on the heating compartment vestibule panel. This limit is factory set and requires no adjustment.

Flame Rollout Switches (Two)

These manually reset switches are located on the inside of the burner box. If tripped, check for adequate combustion air before resetting.

Exhaust and Air Intake Pipe

1. Check exhaust and air intake connections for tightness and to make sure there is not blockage.

2. Are pressure switches closed? Obstructed exhaust pipe will cause unit to shut off at pressure switches. Check termination for blockages.

3. Reset manual flame rollout switches on burner box cover.

507028-03 Issue 1622 Page 59 of 74

Heating Sequence of Operation

The integrated control initiates a pressure switch calibration at the initial unit start-up on a call for heat. The ignition control will also initiate a calibration any time main power is turned off and back on and a heating demand is present.

Additional calibrations may be initiated by the service technician during field test sequence. The following heating sequence of operation assumes completion of a successful calibration.

NOTE: The thermostat selection DIP switch on the integrated control is factory set in the “TWO STAGE” position.

Applications Using a Two Stage Thermostat

A-Heating Sequence - Control Thermostat Selection

DIP switch in “Two Stage” Position (Factory Settling)

1. On a call for heat, thermostat first stage contacts close sending a signal to the integrated control. The integrated control runs a self diagnostic program and checks high temperature limit switches for normally closed contacts and pressure switches for normally open contacts. The combustion air inducer is energized at ignition speed, Which is approximately the same as the inducer speed at 70 percent firing rate.

2. Once the control receives a signal that the low fire pressure switch has closed, the combustion air inducer begins a 15 second prepurge in the ignition speed.

3. After the prepurge is complete, a 20 second initial ignitor warm up period begins. The combustion air inducer continues to operate at the ignition speed.

4. After the 20 second warm up period has ended, the gas valve is energized and ignition occurs. At the same time, the control module sends a signal to begin an indoor blower 30 second ON delay. When the delay ends, the indoor blower motor is energized at a speed that matches the firing rate. After the 10 second ignition stabilization delay expires, the inducer speed is adjusted to the appropriate target rate. The inducer will remain at the 70 percent speed as long as the thermostat has a first stage heating demand.

5. If second stage heat is required, the thermostat second stage heat contacts close and send a signal to the integrated control. The integrated control initiates a 30 second secon stage recognition delay.

6. At the end of the recognition delay and on all subsequent calls for heat in the same heating cycle, the intergrated control energizes the combustion air inducer at high speed. The control also checks the high fire pressure switch to make sure it is closed. As the inducer speed is increased to high, the indoor blower motor is adjusted to a speed which is appropriate for the target rate.

7. When the demand for high fire (second stage) heat is satisfied, the gas valve is de-energized and the field selected indoor blower off delay begins. The combustion air inducer begins a 20 second post purge period.

8. When the combustion air post purge period is complete, the inducer is de-energized. The indoor blower is deenergized at the end of the off delay.

Application Using a Two Stage Thermostat

B - Heating Sequence - Control Thermostat Selection

DIP switch in “Variable Capacity” Position

1. On a call for heat, thermostat first stage contacts close sending a signal to the integrated control. The integrated control runs a self diagnostic program and checks high temperature limit switches for normally closed contacts and pressure switches for normally open contacts. The combustion air inducer is energized at ignition speed, which is approximately the same as the inducer speed at 70 percent firing rate.

2. Once the control receives a signal that the low fire pressure switch has closed, the combustion air inducer begins a 15 second prepurge in low speed.

3. After the prepurge is complete, a 20 second initial ignitor warm-up period begins. The combustion air inducer continues to opeate at the ignition speed.

4. After the 20 second warm up period has ended, the gas valve is energized and ignition occurs. At the same time, the control module begins an indoor blower 30 second ON delay. When the delay ends, the indoor blower motor is energized at a speed that matches the firing rate. After the 10 second ignition stabilization delay expires, the inducer speed is adjusted to the appropriate target rate. If the furnace is operating in the initial heating cycle after power up, the initial firing rate will be approximately 35 percent. The firing rate on subsequent cycles will be automatically adjusted by the integrated control based on thermostat cycles. The firing rate will vary and will range from 35 percent to 90 percent. The furnace will continue this operation as long as the thermostat has a first stage heating demand.

Page 60 of 74 Issue 1622 507028-03

5. If second-stage heat is required, the thermostat second stage heat contacts close and send a signal to the integrated control. The integrated control either increases the firing rate to 70 percent (if the current rate is at or below 60 percent) or increases the firing rate by

10 percent (if the current rate is above 60 percent). If the call for heat continues 5 minutes beyond this initial upstage, the rate will be increased by 10 percent every

5 minutes until the call for heat is satisfied or the furnace reaches 100 percent rate. As the firing rate increases, the indoor blower motor is adjusted to a speed which is appropriate for the target rate.

6. If second-stage heat demand is satisfied, but first stage is still present, the furnace will continue to operate at the present firing rate until the heat cycle ends.

7. When the demand for first and second stage heat is satisfied, the gas valve is de-energized and the fieldselected indoor blower off delay begins. The combustion air inducer begins a 20 second post-purge period.


Applications Using A Single-Stage Thermostat

C - Heating Sequence -- Control Thermostat Selection

DIP switch in “Single Stage” Position

1. On a call for heat, thermostat first stage contacts close sending a signal to the integrated control. The integrated control runs a self-diagnostic program and checks high temperature limit switches for normally closed contacts and pressure switches for normally open contacts. The combustion air inducer is energized at the ignition speed, which is approximately the same as the inducer speed at 70 percent firing rate.

2. Once the control receives a signal that the low fire pressure switch has closed, the combustion air inducer begins a 15 second prepurge at the ignition speed.

3. After the prepurge is complete, a 20 second initial ignitor warm up period begins. The combustion air inducer continues to operate at the ignition speed.

4. After the 20 second warm up period has ended, the gas valve is energized and ignition occurs, which initiates a

10 second ignition stabilization delay. At the same time, the control module sends a signal to begin an indoor blower 30 second ON delay. When the delay ends, the indoor blower motor is energized at a speed which is appropriate for the firing rate. After the 10 second ignition stabilization delay expires, the inducer speed is adjusted to 35 percent speed. The integrated control also initiates a second-stage on delay (factory set at 7 minutes; adjustable to 12 minutes).

5. If the heating demand continues beyond the secondstage on delay, the integrated control energizes the combustion air inducer at 70 percent speed. The indoor blower motor is adjusted to a speed which matches the target rate. A fixed, 1O minute third stage on delay is initiated.

6. If the heating demand continues beyond the thirdstage on delay, the integrated control energizes the inducer at high speed. The indoor blower motor is adjusted to a speed which is appropriate for the target rate.

7. When the thermostat heating demand is satisfied, the gas valve is de-energized and the combustion air inducer begins a 20 second post purge. The field selected indoor blower off delay begins.


507028-03 Issue 1622 Page 61 of 74

Service

WARNING

ELECTRICAL SHOCK, FIRE,

OR EXPLOSION HAZARD.

Failure to follow safety warnings exactly could result in dangerous operation, serious injury, death or property damage.

Improper servicing could result in dangerous operation, serious injury, death, or property damage.

Before servicing, disconnect all electrical power to furnace.

When servicing controls, label all wires prior to disconnecting. Take care to reconnect wires correctly.

Verify proper operation after servicing.

At the beginning of each heating season, system should be checked as follows by a qualified service technician:

Blower

Check the blower wheel for debris and clean if necessary.

The blower motors are prelubricated for extended bearing life. No further lubrication is needed.

WARNING

The blower access panel must be securely in place when the blower and burners are operating. Gas fumes, which could contain carbon monoxide, can be drawn into living space resulting in personal injury or death.

Filters

All filters are installed external to the unit. Filters should be inspected monthly. Clean or replace the filters when necessary to ensure proper furnace operation. Table 1 lists recommended filter sizes.

Exhaust and air intake pipes

Check the exhaust and air intake pipes and all connections for tightness and to make sure there is no blockage.

NOTE: After any heavy snow, ice or frozen fog event the furnace vent pipes may become restricted. Always check the vent system and remove any snow or ice that may be obstructing the plastic intake or exhaust pipes.

Electrical

1. Check all wiring for loose connections.

2. Check for the correct voltage at the furnace (furnace operating).

Page 62 of 74

3. Check amp-draw on the blower motor.

Motor Nameplate_____________ Actual___________

Winterizing and Condensate Trap Care

1. Turn off power to the unit.

2. Have a shallow pan ready to empty condensate water.

3. Remove the drain cap from the condensate trap and empty water. Inspect the trap then reinstall the drain cap.

Cleaning Heat Exchanger

If cleaning the heat exchanger becomes necessary, follow the below procedures and refer to Figure 1 when disassembling unit. Use papers or protective covering in front of furnace while removing heat exchanger assembly.

1. Turn off electrical and gas supplies to the furnace.

2. Remove the furnace access panels.

3. Disconnect the 2 pin plug from the gas valve.

4. Remove gas supply line connected to gas valve.

Remove the burner box cover and remove gas valve manifold assembly.

5. Remove sensor wire from sensor. Disconnect 2 pin plug from the ignitor.

6. Disconnect wires from flame rollout switches.

7. Remove four burner box screws at the vestibule panel and remove burner box. Set burner box assembly aside.

NOTE: If necessary, clean burners at this time. Follow procedures outlined in Burner Cleaning section.

8. Loosen the clamps to the flexible exhaust coupling.

9. Disconnect condensate drain line from the cold end header box.

10. Disconnect condensate drain tubing from flue collar.

Remove screws that secures the flue collar into place.

Remove flue collar. It may be necessary to cut the exiting exhaust pipe for removal of the fitting.

11. Mark and disconnect all combustion air pressure tubing from cold end header collector box.

12. Mark and remove wires from pressure switches.

Remove pressure switches. Keep tubing attached to pressure switches.

13. Disconnect the 4 pin plug from the combustion air inducer. Remove two screws which secure combustion air inducer to collector box. Remove combustion air inducer assembly. Remove ground wire from vest panel.

14. Remove electrical junction box from the side of the furnace.

15. Mark and disconnect any remaining wiring to heating compartment components. Disengage strain relief bushing and pull wiring and bushing through the hole in the blower deck.

16. Remove the primary limit from the vestibule panel.

17. Remove two screws from the front cabinet flange at the blower deck. Spread cabinet sides slightly to allow clearance for removal of heat exchanger.

Issue 1622 507028-03

18. Remove screws along vestibule sides and bottom which secure vestibule panel and heat exchanger assembly to cabinet. Remove two screws from blower rail which secure bottom heat exchanger flange. Remove heat exchanger from furnace cabinet.

19. Back wash heat exchanger with soapy water solution or steam. If steam is used it must be below 275°F (135°C).

20. Thoroughly rinse and drain the heat exchanger. Soap solutions can be corrosive. Take care to rinse entire assembly.

21. Reinstall heat exchanger into cabinet making sure that the clamshells of the heat exchanger assembly are resting on the support located at the rear of the cabinet.

Remove the indoor blower to view this area through the blower opening.

22. Re-secure the supporting screws along the vestibule sides and bottom to the cabinet.

23. Reinstall cabinet screws on front flange at blower deck.

24. Reinstall the primary limit on the vestibule panel.

25. Route heating component wiring through hole in blower deck and reinsert strain relief bushing.

26. Reinstall electrical junction box.

27. Reinstall the combustion air inducer. Reconnect the 4 pin plug to the wire harness.

28. Reinstall pressure switches and reconnect pressure switch wiring.

29. Carefully connect combustion air pressure switch hosing from pressure switches to proper stubs on cold end header collector box.

30. Reconnect condensate drain line to the cold end header box.

31. Use securing screws to reinstall flue collar to the top cap on the furnace. Reconnect exhaust piping and exhaust drain tubing.

32. Replace flexible exhaust adapter on combustion air inducer and flue collar. Secure using two existing hose clamps.

33. Reinstall burner box assembly in vestibule area.

34. Reconnect flame roll-out switch wires.

35. Reconnect sensor wire and reconnect 2 pin plug from ignitor.

36. Secure burner box assembly to vestibule panel using four existing screws. Make sure burners line up in center of burner ports.

37. Reinstall gas valve manifold assembly. Reconnect gas supply line to gas valve.

38. Reinstall burner box cover.

39. Reconnect 2 pin plug to gas valve.

40. Replace the blower compartment access panel.

41. Refer to instruction on verifying gas and electrical connections when re-establishing supplies.

42. Follow lighting instructions to light and operate furnace for 5 minutes to ensure that heat exchanger is clean and dry and that furnace is operating properly.

43. Replace heating compartment access panel.

Cleaning the Burner Assembly

1. Turn off electrical and gas power supplies to furnace.

Remove upper and lower furnace access panels.

2. Disconnect the 2 pin plug from the gas valve.

3. Remove the burner box cover.

4. Disconnect the gas supply line from the gas valve.

Remove gas valve/manifold assembly.

5. Mark and disconnect sensor wire from the sensor.

Disconnect wires from flame rollout switches.

6. Remove four screws which secure burner box assembly to vest panel. Remove burner box from the unit.

7. Use the soft brush attachment on a vacuum cleaner to gently clean the face of the burners. Visually inspect the inside of the burners and crossovers for any blockage caused by foreign matter. Remove any blockage.

8. Reinstall the burner box assembly using the existing four screws. Make sure that the burners line up in the center of the burner ports.

9. Reconnect the sensor wire and reconnect the 2 pin plug to the ignitor wiring harness. Reconnect wires to flame rollout switches.

10. Reinstall the gas valve manifold assembly. Reconnect the gas supply line to the gas valve. Reinstall the burner box cover.

11. Reconnect 2 pin plug to gas valve.

12. Replace the blower compartment access panel.

13. Refer to instruction on verifying gas and electrical connections when re-establishing supplies.

14. Follow lighting instructions to light and operate furnace for 5 minutes to ensure that heat exchanger is clean and dry and that furnace is operating properly.

15. Replace heating compartment access panel.

507028-03 Issue 1622 Page 63 of 74

Planned Service

A service technician should check the following items during an annual inspection. Power to the unit must be shut off for the service technician’s safety.

Burners - Must be inspected for rust, dirt, or signs of water.

Vent pipe - Must be inspected for signs of water, cracked, damaged or sagging pipe, or disconnected joints.

Unit appearance - Must be inspected for rust, dirt, signs of water, burnt or damaged wires, or components.

Blower access door - Must be properly in place and provide a seal between the return air and the room where the furnace is installed.

Return air duct - Must be properly attached and provide an air seal to the unit.

Operating performance - Unit must be observed during operation to monitor proper performance of the unit and the vent system.

Combustion gases - Flue products must be analyzed and compared to the unit specifications.

Problems detected during the inspection may make it necessary to temporarily shut down the furnace until the items can be repaired or replaced.

Instruct the homeowners to pay attention to their furnace . Situations can arise between annual furnace inspections that may result in unsafe operation.

Page 64 of 74 Issue 1622 507028-03

Integrated Control Diagnostic Codes

Press the diagnostic push button and hold it to cycle through a menu of options. Every five seconds a new menu item will be displayed.

Release the button when the desired mode is displayed.

When a solid “P” is displayed, the furnace capacity/ size is programmed.

When the solid “E” is displayed, the control enters the Error Code Recall mode. Error Code Recall mode menu options: No change (displaying error history) remains in Error Code Recall mode; solid “b” exits Error Code Recall mode; and solid “c” clears the error history. Must press button while flashing “c” is displayed to clear error codes.

When the solid “-” is displayed, the control enters the Field Test mode. Field Test mode menu options: Solid “C” starts pressure switch calibration; blinking “-” exits Field Test mode.

507028-03 Issue 1622 Page 65 of 74

Configuring Unit Size Codes

Power-Up - Number displayed represents by integrated control unit size code (furnace model and capacity). If three horizontal bars are displayed followed by continuous E203, furnace control does not recognize unit size code. Configure per the following:

To enter Field Test

Mode: push and hold button next to

7-segment LED display until solid dash symbol appears. Release button.

Yes

B

Furnace control in IDLE mode

No heating, cooling or indoor fan operation)

No

Turn room thermostat to OFF

CODE

1

2

FURNACE

If alarm is present, furnace control will display error code. If alarm is not present solid dash starts blinking on

7-segment LED display.

B

Push and hold button until the solid P symbol is displayed on the 7-segment

LED. Release button. This mode allows the user to select a unit size code number that matches the furnace model size and capacity.

IMPORTANT: Field replacement controls may need to be manually configured to validate furnace unit size code.

3

Solid P starts blinking on

7-Segment LED

3

Push and hold button. Integrated control will display unit size code number for each furnace model for five seconds.

When the correct unit size code is displayed, release button. Selected code will flash for

10-second period. During that period, hold push button until code stops blinking (disappear for 2 seconds). Integrated control will store code in memory and will automatically exit Field Test Mode and reset. (If second period expires or push button is held less than five seconds, control will automatically exit Field Test Mode and go into

IDLE mode without storing unit size code. If this happens, programming function must be repeated).

Verify that the selected unit size code is correct and stored in non-volatile memory by cycling the 24 volt power to the furnace control. (At 24 volt power-up of the furnace control, the

7-segment LED will display a unit size code. If three horizontal bars display, board does not recognize unit size code. Programming function must be repeated)

FINISHED

Page 66 of 74 Issue 1622 507028-03

Troubleshooting: Heating Sequence of Operation

Ignition and Call for Low Fire With Two Stage

Thermostat

507028-03 Issue 1622 Page 67 of 74

Troubleshooting : Heating Sequence of Operation (continued)

Call for High Fire With Two Stage Thermostat

2

1

2 Stage

Thermostat

1st Call for High

Fire?

YES

2nd Stage

Recognition Delay

(30 Seconds)

NO

Combustion Air Inducer ON

(100% Rate Speed)

High

Pressure Switch

Closes Within

10 Seconds?

NO

Increase Combustion

Air Inducer Speed

if Not at 100%

Rate Speed

Error Code

Flashes

YES

Adjust Indoor

Blower to

Appropiate speed

3A Wait for Call for Heat Satisfied

Wait 5

Minutes

Page 68 of 74

1

2

System will always light at 70% even if 2nd stage call for heat is in place

If the high pressure switch does not close within 5 attempts, the system will operate at low fire for the remainder of the call for heat at request

Issue 1622 507028-03

Troubleshooting : Heating Sequence of Operation (continued)

Call for Heat Satisfied

RUN MODE (TWO-STAGE THERMOSTAT)

FIRST OR SECOND-STAGE CALL FOR HEAT

ALL INPUTS MONITORED (LIMIT, PRESSURE,

CALL FOR HEAT/COOL, FLAME LEVEL).

3A 3B

RUN MODE (SINGLE-STAGE THERMOSTAT)

ALL INPUTS MONITORED (LIMIT, PRESSURE,

CALL FOR HEAT/COOL, FLAME LEVEL).

2nd Stage Heat

2nd Stage

Call for Heat satisfied?

YES

NO

Combustion Air Inducer switched to 70% rate speed

Adjust Indoor Blower to appropiate speed

1st Stage Heat

1st Stage

Call for Heat satisfied?

YES

Gas valve

De-Energized

NO

Combustion Air Inducer OFF after 20-Second Post Purge

Indoor Blower OFF after OFF Delay

1

Wait for Call

Two-Stage

Thermostat

OR 4

Wait for Call

Single-Stage

Thermostat

507028-03 Issue 1622 Page 69 of 74

Troubleshooting: Heating Sequence of Operation

S

T

A

G

E

1

S

T

H

E

A

T

C

A

L

L

F

O

R

1

IGNITION AND CALL FOR LOW FIRE WITH TWO-STAGE

THERMOSTAT

I

L

G

H

T

O

F

F

Safety

Check

Verify There

Is No Main Burner

Flame

Limit

Switch

Closed?

YES

Rollout

Circuit

Closed?

YES

Low

Pressure

Switch

Open?

NO

NO

NO

De-Energize

Gas Valve

De-Energize

Gas Valve

Error Code Flashes

After 5 Seconds

Indoor blower OFF

Heat OFF Delay

After

(Low Heat Speed)

Combustion Air

Inducer On

(100% rate speed)

Error Code

Flashes

Indoor Blower

ON (100%)

YES

Limit

Closes Within 3

Minutes?

NO

Indoor Blower OFF

After Heat OFF Delay

(High Heat Speed)

Combustion

Air Inducer

On (100% rate speed)

Indoor Blower

ON (70%)

Error Code

Flashes

Rollout

Circuit

Closes?

YES

Soft Lockout:

Error Code

Flashes

NO Combustion Air

Inducer OFF

After Post-Purge

1

High

Pressure

Switch

Open?

NO

Error Code Flashes

After 5 Seconds

Indoor Blower OFF After

Heat OFF Delay

Low Pressure

Switch Opens

YES

High Pressure

Switch Opens

Hard Lockout:

Error Code

YES

Combustion Air

Inducer ON at 70%

Rate Speed

YES

Call

For

Heat?

YES

NO

NO

Low

Pressure Switch

Closed Within 150

Seconds?

NO

Pressure Switch

Calibration

YES

Pre-Purge

15 Seconds

Calibration

Successful?

NO

Wait

5 minutes

4

Calibrations

Attempted?

YES

Soft Lockout:

Error Code

Flashes

NO

Call For

Heat

Ends?

YES

Ignitor ON

20 Seconds

Gas Valve

Energized

Interpurge

(15 Seconds)

NO

Indoor

Blower

ON?

YES

Indoor blower OFF

After Heat OFF Delay

NO

Ignition Trial Begins

(Ignitor ON)

Indoor Blower Delay

Timer Started

1

Flame

Sensed Within

4 seconds?

NO

Gas Valve

De-energized

Ignitor OFF

5th

Unsuccessful

Trial?

YES

Post-Purge

(20Seconds)

Combustion

Air Inducer

OFF

Soft Lockout:

Error Code

Flashes 1

YES

Ignitor OFF

Wait For Ignition

Stabilization Delay

Set Target Firing Rate

Based on Thermostat

Signals Present

1 SOFT LOCKOU T IS RESE T AUTOMATICALLY AFTER ONE HOUR WITH A CALL FOR HE AT ACTIVE,

OR BY CYCLING THE CAL L FOR HE AT, OR B Y CYCLING POWER TO THE CONTROL.

2 HARD LOCKOU T IS RESE T BY CYCLING POWER TO THE CONTROL.

2

Call For 2nd Stage Heat

OR

3A

Call For Heat Satisfied

Page 61

Page 70 of 74 Issue 1622 507028-03

Troubleshooting : Cooling Sequence of Operation

CALL FOR COOLING

5

1st Stage Cooling

Request Received

Energize 1st Stage

Cooling Contactor

(Compressor & Fan)

Indoor Blower On

After 2-second delay

1

Energize Indoor Blower

(Per Ramping Profile)

2

1

2nd Stage

Cooling

Request?

YES

Energize 2nd Stage

Cooling Contactor

(Compressor & Fan)

NO

YES

Energize Indoor Blower

(High Cooling mode)

2

2nd Stage

Cooling Request

Still Active?

YES

NO

De-Energize 2nd

Stage Cooling

Contactor

(Compressor & Fan)

Maintain Indoor Blower

(High Cooling mode)

1st Stage

Cooling Request

Still Active?

YES

NO

Energize and

Maintain Indoor Blower at

Low Cooling mode

De-Energize 1st

Stage Cooling

Contactor

(Compressor & Fan)

De-Energize Indoor Blower

Per Ramping Profile

2

YES

1st Stage

Cooling Request

Still Active?

NO

507028-03 Issue 1622 Page 71 of 74

Troubleshooting : Continuous Fan Sequence of Operation

Continuous Low Speed Indoor Blower Sequence of Operation

6

Call for

Continuous Blower

Indoor Blower On

(Speed Determined by

Dip Switch settings)

Request for Cooling

Received?

YES

Maintain Indoor

Blower at set speed

NO

Request for Heat

Received?

YES

NO

Maintain Indoor

Blower at set speed

5

1

OR

4

Go to Call for Cooling

Go to Call for Heat -- Two-Stage Thermostat

Go to Call for Heat -- Single-Stage Thermostat

Call for Fan

Removed?

NO

Maintain Indoor

Blower at set speed

1

YES

De-Energize

Indoor Blower Per

Ramping Profile

1

Indoor blower low cooling mode and high cooling mode, have specific ON - OFF and speed ramping profiles. The specific profile is selected using the dip switches on the control.

Page 72 of 74 Issue 1622 507028-03

REPAIR PARTS LIST

The following repair parts are available through Allied Air distributors. When ordering parts, include the complete furnace model number listed on the nameplate. All service must be performed by a licensed professional installer (or equivalent), service agency, or gas supplier.

Cabinet Parts

Outer Access Panel

Blower Access Panel

Top Cap

Control Panel Parts

Transformer

Integrated Control Board

Door Interlock Switch

Circuit Breaker

Heating Parts

Flame Sensor

Heat Exchanger Assembly

Gas Manifold

Combustion Air Inducer

Gas Valve

Main Burner Cluster

Main Burner Orifices

Pressure Switch

Ignitor

Primary Limit Control

Flame Rollout Switches

Blower Parts

Blower Wheel

Motor

Motor Mounting Frame

Blower Housing Cut Off Plate

Power Choke (1 HP only)

507028-03 Issue 1622 Page 73 of 74

REQUIREMENTS for COMMONWEALTH of MASSACHUSETTS

Modifications to NFPA-54, Chapter 10

Revise NFPA-54 section 10.8.3 to add the following requirements:

For all side wall, horizontally vented, gas-fueled equipment installed in every dwelling, building or structure used in whole or in part for residential purposes, including those owned

4. INSPECTION. The state or local gas inspector of the side wall, horizontally vented, gas-fueled equipment shall not approve the installation unless, upon inspection, the inspector observes carbon monoxide detectors and signage installed in accordance with the provisions of 248 CMR 5.08(2)(a) 1 through 4.

or operated by the Commonwealth and where the side wall exhaust vent termination is less than seven (7) feet above the finished grade in the area of the venting, including but

EXEMPTIONS: The following equipment is exempt from

24 CMR 5.08(2)(a) 1 through 4: not limited to decks and porches, the following requirements shall be satisfied:

1. INSTALLATION OF CARBON MONOXIDE

DETECTORS.

At the time of installation of the side wall, horizontally vented, gas-fueled equipment, the installing plumber or gas fitter shall observe that a hard-wired carbon monoxide detector with an alarm and battery backup is installed on the floor level where the gas equipment is to be installed. In addition, the installing plumber or gas fitter shall observe that a batteryoperated or hard-wired carbon monoxide detector with an alarm is installed on each additional level of the dwelling, building or structure served by the side wall, horizontally vented, gas-fueled equipment. It shall be the responsibility of the property owner to secure the services of qualified licensed professionals for the installation of hard-wired carbon monoxide detectors.

a. In the event that the side wall, horizontally equipment is installed in a crawl space or an attic, the hard-wired carbon monoxide

detector with alarm and battery backup may be

installed on the next adjacent floor level.

1. The equipment listed in Chapter 10 entitled “Equipment

Not Required to Be Vented” in the most current edition of NFPA 54 as adopted by the Board; and

2. Product Approved side wall, horizontally vented, gas-fueled equipment installed in a room or structure separate from the dwelling, building or structure used in whole or in part for residential purposes.

MANUFACTURER REQUIREMENTS -

GAS EQUIPMENT VENTING SYSTEM PROVIDED.

When the manufacturer of Product Approved side wall, horizontally vented, gas-fueled equipment provides a venting system design or venting system components with the equipment, the instructions provided by the manufacturer for installation of the equipment and the venting system shall include:

1. Detailed instructions for the installation of the venting system design or the venting system components: and

2. A complete parts list for the venting system design or venting system.

MANUFACTURER REQUIREMENTS -

GAS EQUIPMENT VENTING SYSTEM NOT PROVIDED.

When the manufacturer of Product Approved sidewall, b. In the event that the requirements of this subdivision at the time of completion of cannot be met

installation, the owner shall have a period of thirty

(30) days to comply with the above requirements;

provided, however, that during said thirty (30) day

period, a battery-operated carbon monoxide

detector with an alarm shall be installed.

2. APPROVED CARBON MONOXIDE DETECTORS.

Each carbon monoxide detector as required in accordance with the above provisions shall comply with

NFPA 720 and be ANSI/UL 2034 listed and IAS certified.

3. SIGNAGE . A metal or plastic identification plate shall be permanently mounted to the exterior of the building at a minimum height of eight (8) feet above grade directly in line with the exhaust vent terminal for the horizontally vented, gas-fueled heating appliance or equipment. The sign shall read, in print size no less than one-half (1/2) inch in size, “GAS VENT DIRECTLY BELOW. KEEP

CLEAR OF ALL OBSTRUCTIONS.” horizontally vented, gas-fueled equipment does not provide the parts for venting the flue gases, but identifies “special venting systems,” the following requirements shall be satisfied by the manufacturer:

1. The referenced “special venting system” instructions shall be included with the appliance or equipment installation instructions; and

2. The “special venting systems” shall be Product Approved by the Board, and the instructions for that system shall include a parts list and detailed installation instructions.

A copy of all installation instructions for all Product

Approved side wall, horizontally vented, gas-fueled equipment, all venting instructions, all parts lists for venting instructions, and/or all venting design instructions shall remain with the appliance or equipment at the completion of the installation.

Page 74 of 74 Issue 1622 507028-03

Allied Air A97USMV Installation Instructions Manual

INSTALLATION INSTRUCTIONS

Warm Air Gas Furnace

Upflow/Horizontal Left and Right Air Discharge

* Kit 51W11 is provided with a 1-1/2” accelerator which must be for all 2 and 2-1/2” PVC installations.

+ Termination kits 44W92 and 44W93 are approved for use in Canadian installations to meet CSAB149.

++ The 44W92 Concentric kit is provided with a 1-1/2” accelerator Which must be installed on the exhaust outlet

when this kit is used with this furnace.

Integrated Control

Single Stage

2 Stage

Troubleshooting: Heating Sequence of Operation

CALL FOR COOLING

REQUIREMENTS for COMMONWEALTH of MASSACHUSETTS

Related manuals

Table of contents

Allied Air A97USMV Installation Instructions Manual

INSTALLATION INSTRUCTIONS

Warm Air Gas Furnace

Upflow/Horizontal Left and Right Air Discharge

* Kit 51W11 is provided with a 1-1/2” accelerator which must be for all 2 and 2-1/2” PVC installations.

+ Termination kits 44W92 and 44W93 are approved for use in Canadian installations to meet CSAB149.

++ The 44W92 Concentric kit is provided with a 1-1/2” accelerator Which must be installed on the exhaust outlet

when this kit is used with this furnace.

Integrated Control

Single Stage

2 Stage

Troubleshooting: Heating Sequence of Operation

CALL FOR COOLING

REQUIREMENTS for COMMONWEALTH of MASSACHUSETTS

Related manuals

Asko

CC4525S

Century

GUH97M135D5M-CY

Armstrong Air Conditioning

A97DSMV

Allied

A97USMV

White Rodgers

50N02B-820

Century

TGRG36901P-CY

Lennox

EL195UHNE Low Nox Series Units

Lennox

EL195UHNE Low Nox Series Units

Lennox

EL195UHNE Low Nox Series Units

Table of contents