Bryant 355MAV C Series Installation, Start-up, And Operating Instructions Manual

installation, start-up,
and operating instructions

4-WAY MULTIPOISE
VARIABLE-CAPACITY
CONDENSING GAS FURNACE

Cancels: II 355M-40-2 II 355M-40-3

355MAV

Series C

6-95

A93040

NOTE: Read the entire instruction manual before starting the
installation.

This symbol → indicates a change since the last issue.
Index Page

DIMENSIONAL DRAWING........................................................2

SAFETY CONSIDERATIONS.....................................................3

Clearances to Combustibles......................................................3

ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS....3-4

INTRODUCTION..........................................................................4

APPLICATIONS ......................................................................4-11

General......................................................................................4

Upflow Applications..............................................................4-6

Downflow Applications.........................................................6-8

Horizontal Left (Supply-Air Discharge) Applications.........8-9

Horizontal Right (Supply-Air Discharge) Applications.....9-11

LOCATION ............................................................................11-12

General...............................................................................11-12

Low-Fire Only Installation.....................................................12

Furnace Location Relative to Cooling Equipment................12

Hazardous Locations...............................................................12

INSTALLATION....................................................................13-16

Leveling Legs (If Desired).....................................................13

Installation On a Concrete Slab .............................................13

Installation On a Combustible Floor (Downflow

Applications)......................................................................13

Installation In Horizontal Applications..................................14

Filter Arrangement..................................................................14

Bottom Closure Panel.............................................................14

Gas Piping..........................................................................14-16

ELECTRICAL CONNECTIONS...........................................16-19

115-v Wiring......................................................................17-19

24-v Wiring.............................................................................19

Accessories..............................................................................19

DIRECT VENTING ...............................................................19-29

Removal of Existing Furnaces from

Common Vent Systems................................................19-20

Combustion-Air and Vent Piping .....................................20-25

Concentric Vent and Combustion-Air Termination

Kit Installation..............................................................25-27

Multiventing and Vent Terminations................................27-29

CONDENSATE DRAIN..............................................................29

General....................................................................................29

Application..............................................................................29

Condensate Drain Protection..................................................29

®

HORIZONTAL

LEFT

AIRFLOW

Fig. 1—Multipoise Orientations

SEQUENCE OF OPERATION..............................................30-32

Self-Test Mode........................................................................30

Heating Mode..........................................................................30

Heat Mode—Two Stage.........................................................30

Emergency Heat Mode......................................................30-31

Cooling Mode .........................................................................31

Heat Pump Mode...............................................................31-32

Continuous Fan Mode ............................................................32

Component Test......................................................................32

Bypass Humidifier Mode........................................................32

Dehumidification Mode..........................................................32

Zone Mode..............................................................................32

START-UP PROCEDURES ..................................................32-37

General...............................................................................32-33

Select Setup Switch Positions................................................33

Prime Condensate Trap With Water......................................33

Purge Gas Lines ................................................................33-34

Adjustments .......................................................................34-37

Set Gas Input Rate ............................................................34-36

Set Temperature Rise..............................................................36

Set Thermostat Heat Anticipator............................................37

CHECK SAFETY CONTROLS ............................................37-38

Check Primary Limit Control.................................................37

Check Pressure Switch......................................................37-38

CHECKLIST...........................................................................38-39

ama

As an ENERGY STAR Partner, BDP Company has deter­mined that this product meets the ENERGY STAR guidelines
for energy efficiency.

AIRFLOW

UPFLOW

DOWNFLOW

AIRFLOW

CANADIAN GAS ASSOCIATION

HORIZONTAL

RIGHT

AIRFLOW

APPROVED

R

A93041

—1—

⁄2"

1

28

1

⁄16"

15

26

AIRFLOW

⁄4"
26

⁄8"

7

⁄16"

⁄8"

5

OUTLET

2-IN. COMBUSTION-

TYP

5

⁄2-IN. DIA

1

GAS CONN

AIR CONN

⁄8-IN. DIA

7

⁄16"

13

⁄16"

5

19"

22

⁄16"

9

39

POWER CONN

2-IN. VENT CONN

⁄2-IN. DIA

THERMOSTAT ENTRY

1

⁄16"

⁄16"

7

1

⁄4" TYP
22

11

⁄16"

3

24

1"

⁄16"

11

22

SIDE INLET

A93023

BOTTOM INLET

⁄4"

1

18

⁄2"

1

30

(DOWNFLOW &

OR ALTERNATE

TRAP LOCATION

/16"

13

A

D

-IN. DIA GAS CONN

⁄2

1

HORIZONTAL RIGHT)

CONDENSATE DRAIN

OUTLET

CONDENSATE

INLET

HANGING

(UPFLOW)

DRAIN LOCATION

FOR HORIZONTAL

DIMPLE LOCATORS

/16"

11

E

/2-In. rectangle.

/4-In. rectangle.

1

1

/2 x 19

/2 x 23

1

1

/2 x 12-In. rectangle.

1

/16"

13

⁄4"

1

TYP

33

⁄8"

5

TYP

32

⁄16"

13

30

⁄16"

11

TYP

29

⁄8"

5

27

⁄16"

9

TYP

27

⁄2"

1

24

⁄16"

5

/16"

11

DIMENSIONS (IN.)

Fig. 2—Dimensional Drawing

For 800 CFM--16-In. round or 14

For 1200 CFM--20-In. round or 14

For 1600 CFM--22-In. round or 14

For airflow requirements above 1800 CFM, use both side inlets, a

combination of 1 side inlet and the bottom, or the bottom only.

NOTES: Minimum return-air opening at furnace:

1.

2.

3.

4.

17

⁄8-IN. DIA

POWER CONN

7

CONDENSATE

DRAIN TRAP

CONDENSATE DRAIN

TRAP LOCATION

(DOWNFLOW &

HORIZONTAL LEFT)

⁄16"

15

⁄4"

1

26

⁄2"

1

26

⁄16"

24

5

22

⁄2-IN. DIA

1

2-IN. COMBUSTION-

AIR CONN

GAS CONN

2-IN. VENT CONN

⁄8-IN. DIA

ACCESSORY

7

ENTRY

⁄16"

11

22

⁄2-IN. DIA THERMOSTAT

1

LOCATION

POWER ENTRY

⁄16"

7

9

(ALTERNATE

UPFLOW)

SIDE INLET

⁄2"

1

TYP

14

TYP

CONDENSATE

DRAIN LOCATION

(UPFLOW)

⁄4" TYP

⁄16" TYP

1

15

23

SIDE INLET

26

⁄4"

1

1

1"

042060 17-1/2 15-7/8 16

042080 21 19-3/8 19-1/2

042040* 24-1/2* 22-7/8* 23*

UNIT SIZE A D E

060100 21 19-3/8 19-1/2

→060080 21 19-3/8 19-1/2

→060120 24-1/2 22-7/8 23

* These dimensions reflect the wider casing for the Trophy (96.6 percent AFUE) furnace.

—2—

SAFETY CONSIDERATIONS

Installing and servicing heating equipment can be hazardous due to
gas and electrical components. Only trained and qualified person­nel should install, repair, or service heating equipment. Untrained
personnel can perform basic maintenance functions such as clean­ing and replacing air filters. All other operations must be per­formed by trained service personnel. When working on heating
equipment, observe precautions in literature, on tags, and on labels
attached to or shipped with unit and other safety precautions that
may apply.

Follow all safety codes. In the United States, follow all safety
codes including the National Fuel Gas Code (NFGC) NFPA No.
54-1992/ANSI Z223.1-1992. In Canada, refer to the current
edition of the National Standard of Canada CAN/CGA-B149.1­and .2-M91 Natural Gas and Propane Installation Codes (NSC­NGPIC). Wear safety glasses and work gloves. Have fire extin­guisher available during start-up and adjustment procedures and
service calls.

Recognize safety information. This is the safety-alert symbol
When you see this symbol on unit or in instructions and manuals,
be alert to potential for personal injury.

Understand the signal words DANGER, WARNING, and CAU­TION. These words are used with safety-alert symbol. DANGER
identifies most serious hazards which will result in severe personal
injury or death. WARNING signifies hazards which could result in
personal injury or death. CAUTION is used to identify unsafe
practices which would result in minor personal injury or product
and property damage. NOTE is used to highlight suggestions
which will result in enhanced installation, reliability, or operation.

→

ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS

CAUTION: Electrostatic discharge can affect electronic

components. Take precautions during furnace installation
and servicing to protect the furnace electronic control.
Precautions will prevent electrostatic discharges from
personnel and hand tools which are held during the
procedure. These precautions will help to avoid exposing
the control to electrostatic discharge by putting the
furnace, the control, and the person at the same electro­static potential.

1. Disconnect all power to the furnace. DO NOT TOUCH

THE CONTROL OR ANY WIRE CONNECTED TO THE
CONTROL PRIOR TO DISCHARGING YOUR BODY’S
ELECTROSTATIC CHARGE TO GROUND.

2. Firmly touch a clean, unpainted, metal surface of the

.

furnace chassis which is close to the control. Tools held in
a person’s hand during grounding will be satisfactorily
discharged.

3. After touching the chassis you may proceed to service the
control or connecting wires as long as you do nothing that
recharges your body with static electricity (for example; DO
NOT move or shuffle your feet, DO NOT touch un­grounded objects, etc.).

4. If you touch ungrounded objects (recharge your body with
static electricity), firmly touch furnace again before touch­ing control or wires.

This appliance is equipped only for altitudes 0 - 2,000 ft (0-610 m) for use with natural
gas and propane. A conversion kit, supplied by the manufacturer, shall be used to convert to
the alternate fuel or elevation.

This direct-vent, forced-air furnace is for indoor installation in a building constructed
on site or in a manufactured (mobile) home when using factory authorized kit, see
rating plate. For installation in alcove or closet at minimum clearances from combustible
material as shown below.

This appliance requires a special venting system. Refer to the installation instructions for
parts list and method of installation. This furnace is for use with schedule-40 PVC, PVC-DWV,
or ABS-DWV pipe, and must not be vented in common with other gas-fired appliances.
Construction through which vent/air intake pipes may be installed is maximum 24 inches
(600 mm), minimum 3/4 inches (19 mm) thickness (including roofing materials).

MINIMUM CLEARANCE TO COMBUSTIBLE MATERIAL

TOP

BOTTOM

FRONTBACKSIDES

0
1 0030
1 1030

#

For Installation on combustible floors only when installed on special base

#

†

0

*

VENT

Ø

03001
Ø
Ø

INCHES

UPFLOW
DOWNFLOW
HORIZONTAL

No. KGASB0201ALL.

Clearance shown is for air inlet and air outlet end.

*

Horizontal position: Line contact is permissible only between lines formed by intersections

of top and two sides of furnace jacket, and building joists, studs, or framing.

†

120,000 BTU Input Furnaces require 1 inch bottom clearance to combustible materials.
Minimum front clearance for service is 30 inches. (762mm).

Ø

320611-101 REV. G

A93060

→ Fig. 3—Clearances to Combustibles

—3—

5. Use this procedure for installed and uninstalled (un­grounded) furnaces.

6. Before removing a new control from its container, dis­charge your body’s electrostatic charge to ground to protect
the control from damage. If the control is to be installed in
a furnace, follow items 1 through 5 before bringing the
control or yourself into contact with the furnace. Put all
used AND new controls into containers before touching
ungrounded objects.

7. An ESD service kit (available from commercial sources)
may also be used to prevent ESD damage.

INTRODUCTION

The 355MAV Multipoise Condensing Gas-Fired Furnaces are
A.G.A./C.G.A. certified for natural and propane gases and for
installation in alcoves, attics, basements, closets, utility rooms,
crawlspaces, and garages.
These furnaces SHALL NOT be installed directly on carpeting,
tile, or any other combustible material other than wood flooring. In
downflow installations, accessory floor base MUST be used when
installed on combustible materials and wood flooring. The design
of this furnace line is not A.G.A./C.G.A. certified for installation
in mobile homes, recreation vehicles, or outdoors. These furnaces
are suitable for installation in a residence built on site or a
manufactured residence completed at final site.
These furnaces are shipped with the drain and pressure tubes
connected for UPFLOW applications. Minor modifications are
required when used in DOWNFLOW, HORIZONTAL RIGHT, or
HORIZONTAL LEFT (supply-air discharge direction) applica­tions as shown in Fig. 1. See details in Applications section.
These furnaces are shipped with the following materials to assist in
proper furnace installation. These materials are shipped in the main
blower compartment.

Installer Packet includes:

Installation, Start-Up, and Operating Instructions
Service and Maintenance Instructions
User’s Information Manual
Warranty Certificate

Loose Parts Bag includes: Quantity

Pressure tube extension 1
Collector box or condensate trap extension tube 1
Inducer housing drain tube 1
1/2-in. CPVC street elbow 2
Drain tube coupling 1
Drain tube coupling grommet 1
Vent and combustion-air pipe support 2

Combustion-air pipe perforated disk assembly 1
Before installing the furnace in the United States, refer to the
current edition of the NFGC. For further information, the NFGC is
available from National Fire Protection Association Inc., Battery­march Park, Quincy, MA 02269; American Gas Association, 1515
Wilson Boulevard, Arlington, VA 22209; or from Literature
Distribution.
Before installing the furnace in Canada, refer to the current edition
of the NSCNGPIC. Contact Standards Department of Canadian
Gas Association, 55 Scarsdale Road, Don Mills, Ontario, Canada
M3B 2R3.
Installations must comply with regulations of serving gas supplier
and local building, heating, plumbing, or other codes in effect in
area in which installation is made. In absence of local codes,
installation must conform with NFGC.
Canadian installations must be made in accordance with NSCNG­PIC and all authorities having jurisdiction.
These instructions cover minimum requirements for a safe instal­lation and conform to existing national standards and safety codes.
In some instances, these instructions exceed certain local codes
and ordinances, especially those that may not have kept pace with
changing residential construction practices. We require these
instructions as a minimum for a safe installation.

CAUTION: Application of this furnace should be in­doors with special attention given to vent sizing and
material, gas input rate, air temperature rise, unit leveling,
and unit sizing. Improper installation or misapplication of
furnace can require excessive servicing or cause prema­ture component failure.

WARNING: Improper installation, adjustment, alter­ation, service, maintenance, or use can cause carbon
monoxide poisoning, explosion, fire, electrical shock, or
other conditions which may cause personal injury or
property damage. Consult a qualified installer, service
agency, local gas supplier, or your distributor or branch
for information or assistance. The qualified installer or
agency must use only factory-authorized and listed kits or
accessories when modifying this product. Failure to
follow this warning could result in electrical shock, fire,
personal injury, or death.

For accessory installation details, refer to applicable installation
literature.

APPLICATIONS

I. GENERAL

Some assembly and modifications are required for furnaces
installed in any of the 4 applications shown in Fig. 1. All drain and
pressure tubes are connected as shown in Fig. 5. See appropriate
application instructions for these procedures.

II. UPFLOW APPLICATIONS

An upflow furnace application is where furnace blower is located
below combustion and controls section of furnace and conditioned
air is discharged upwards.

A. Condensate Trap Location (Factory-Shipped
Orientation)

The condensate trap is factory installed in the blower shelf and
factory connected for UPFLOW applications. A factory-supplied
tube is used to extend the condensate trap drain connection to the
desired furnace side for field drain attachment. See Condensate
Trap Tubing (Factory-Shipped Orientation) section for drain tube
extension details.

B. Condensate Trap Tubing (Factory-Shipped
Orientation)

NOTE: See Fig. 5 or tube routing label on main furnace door to

confirm location of these tubes.

1. Collector Box Drain, Inducer Housing Drain, Relief Port,
and Pressure Switch Tubes

These tubes should be factory attached to condensate trap
and pressure switch ready for use in UPFLOW applications.
These tubes can be identified by their connection location
and also by a color label on each tube. These tubes are
identified as follows: collector box drain tube (blue label),
inducer housing drain tube (violet label or molded), relief
port tube (green label), and pressure switch tube (pink
label).

2. Condensate Trap Drain Tube
The condensate trap drain connection must be extended for

field attachment by doing the following:
a. Determine location of field drain connection. (See Fig. 2

or 5.)

NOTE: If internal filter is used, drain tube should be located to
opposite side of casing of return duct attachment to assist in filter
removal.

—4—

BLOWER SHELF

CONDENSATE
TRAP (INSIDE)

ALTERNATE DRAIN
TUBE LOCATION

CONDENSATE TRAP

DRAIN TUBE LOCATION

UPFLOW APPLICATIONS

FURNACE
DOOR

FIELD

DRAIN

CONN

EXTERNAL UPFLOW APPLICATIONS

SLOT FOR SCREW

HORIZONTAL

APPLICATION

(OPTIONAL)

1

2

1

3

4

WIRE TIE
GUIDES
(WHEN USED)

CONDENSATE
TRAP

FURNACE

SIDE

7

8

4

1

4

26

1

2

1

FURNACE
DOOR

FIELD

DRAIN

CONN

FURNACE
SIDE

4

3

4

5

1

4

26

4

3

5

3

4

SIDE VIEW FRONT VIEW END VIEW FRONT VIEW

DOWNFLOW AND ALTERNATE

1

8

7

3

4

1

7

8

1

4

2

1

⁄4 OD
COLLECTOR BOX TO
TRAP RELIEF PORT

1

⁄2 OD
INDUCER HOUSING
DRAIN CONNECTION

5

⁄8 OD
COLLECTOR BOX
DRAIN CONNECTION

SCREW HOLE FOR
UPFLOW OR DOWN-
FLOW APPLICATIONS
(OPTIONAL)

1

⁄2-IN. PVC OR CPVC

HORIZONTAL

APPLICATIONS

4

FRONT VIEW SIDE VIEW

Fig. 4—Condensate Trap

b. Remove and discard casing drain hole plug button from

desired side.

c. Install drain tube coupling grommet (factory-supplied in

loose parts bag) in selected casing hole.

d. Slide drain tube coupling (factory-supplied in loose parts

bag) through grommet so long end of coupling faces
blower.

e. Cement 2 factory-supplied 1/2-in. street CPVC elbows to

rigid drain tube connection on condensate trap. (See Fig.

5.) These elbows must be cemented together and ce­mented to condensate trap drain connection.

NOTE: Failure to use CPVC elbows may allow drain to kink,
preventing draining.

f. Connect larger diameter drain tube and clamp (factory-

supplied in loose parts bag) to condensate trap and clamp

securely.
g. Route tube to coupling and cut to appropriate length.
h. Attach tube to coupling and clamp securely.

C. Condensate Trap Location (Alternate Upflow
Orientation)

An alternate location for the condensate trap is the left-hand side
of casing. (See Fig. 2 and 6.)
NOTE: If the alternate left-hand side of casing location is used,
the factory-connected drain and relief port tubes must be discon­nected and modified for attachment. See Condensate Trap Tubing
(Alternate Upflow Orientation) section for tubing attachment.

A93026

To relocate condensate trap to the left-hand side, perform the
following:

1. Remove 3 tubes connected to condensate trap.

2. Remove trap from blower shelf by gently pushing tabs
inward and rotating trap.

3. Remove casing hole filler cap from casing hole. (See Fig. 2
or 6.)

4. Install casing hole filler cap into blower shelf hole where
trap was removed.

5. Install condensate trap into left-hand side casing hole by
inserting tube connection stubs through casing hole and
rotating until tabs snap into locking position.

D. Condensate Trap Tubing (Alternate Upflow
Orientation)

NOTE: See Fig. 6 or tube routing label on main furnace door to

confirm location of these tubes.

1. Collector Box Drain Tube
Connect collector box drain tube (blue label) to condensate

trap.

NOTE: On 17-1/2-in. wide furnaces ONLY, cut tube between
corrugated sections to prevent kinks.

2. Inducer Housing Drain Tube
a. Remove and discard LOWER (molded) inducer housing

drain tube which was previously connected to conden­sate trap.

—5—

PLUG

CAP

COLLECTOR BOX

DRAIN TUBE (BLUE

& WHITE STRIPED)

COLLECTOR BOX

TUBE (PINK)

PLUG

CAP

COLLECTOR BOX

DRAIN TUBE (BLUE

& WHITE STRIPED)

COLLECTOR BOX

TUBE (PINK)

COLLECTOR BOX

TUBE (GREEN)

INDUCER HOUSING 

(MOLDED) DRAIN 

TUBE (BEHIND 

COLLECTOR BOX 

DRAIN TUBE)

COLLECTOR BOX

DRAIN TUBE (BLUE)

COLLECTOR BOX

TUBE (GREEN)

FIELD-INSTALLED

FACTORY-SUPPLIED

DRAIN TUBE

COUPLING (LEFT

DRAIN OPTION)

FIELD-INSTALLED

FACTORY-SUPPLIED

DRAIN TUBE

FIELD-INSTALLED

FACTORY-SUPPLIED

1

⁄2 -IN. CPVC STREET

ELBOWS (2) FOR

LEFT DRAIN OPTION

FIELD-INSTALLED

FACTORY-SUPPLIED

COUPLING (RIGHT

DRAIN OPTION)

CONDENSATE 
TRAP

DRAIN TUBE

Fig. 5—Factory-Shipped Upflow Tube Configuration

(Shown With Blower Access Panel Removed)

A94213

COLLECTOR BOX

DRAIN TUBE (GREEN)

CONDENSATE

TRAP

INDUCER
HOUSING

DRAIN TUBE

(VIOLET)

A94214

Fig. 6—Alternate Upflow Tube Configuration and Trap

Location

b. Use inducer housing drain extension tube (violet label

and factory-supplied in loose parts bag) to connect
LOWER inducer housing drain connection to the con-

densate trap.
c. Determine appropriate length, cut, and connect tube.
d. Clamp tube to prevent any condensate leakage.

3. Relief Port Tube
a. Connect relief port tube (green label) to condensate trap.
b. Use small diameter tube (factory-supplied in loose parts

bag) to extend this tube if required.

c. Determine appropriate length, cut, and connect tube.

E. Condensate Trap Field Drain Attachment

Refer to Condensate Drain section for recommendations and
procedures.

F. Pressure Switch Tubing

The LOWER collector box pressure tube (pink label) is factory
connected to the pressure switch and should not require any
modification.

NOTE: See Fig. 5 or 6 or tube routing label on main furnace door
to check for proper connections.

G. Upper Collector Box and Inducer Housing (Unused)
Drain Connections

UPPER COLLECTOR BOX DRAIN CONNECTION

Attached to the UPPER collector box drain connection is a
factory-installed corrugated, plugged tube (blue and white striped
label). This tube is plugged to prevent condensate leakage in this
application. Ensure this tube is plugged.

NOTE: See Fig. 5 or 6 or tube routing label on main furnace door
to check for proper connections.

UPPER INDUCER HOUSING DRAIN CONNECTION

Attached to the UPPER (unused) inducer housing drain connection
is a cap and clamp. This cap is used to prevent condensate leakage
in this application. Ensure this connection is capped.

NOTE: See Fig. 5 or 6 or tube routing label on main furnace door
to check for proper connections.

H. Condensate Trap Freeze Protection

Refer to Condensate Drain Protection section for recommenda­tions and procedures.

III. DOWNFLOW APPLICATIONS

A downflow furnace application is where furnace blower is located
above combustion and controls section of furnace and conditioned
air is discharged downwards.

—6—

COLLECTOR BOX

DRAIN TUBE (BLUE)

CAP

PLUG

COLLECTOR BOX

TUBE (GREEN)

COLLECTOR BOX

TUBE (PINK)

COLLECTOR BOX

DRAIN TUBE (BLUE

& WHITE STRIPED)

COLLECTOR BOX 

EXTENSION TUBE

CONDENSATE

TRAP

INDUCER HOUSING 

DRAIN TUBE (VIOLET)

COLLECTOR BOX
TUBE (GREEN)

PLUG
CAP

COLLECTOR BOX
DRAIN TUBE (BLUE)

COLLECTOR BOX
TUBE (PINK)

COLLECTOR BOX
DRAIN TUBE (BLUE
& WHITE STRIPED)

COLLECTOR BOX 
EXTENSION TUBE

INDUCER HOUSING 
DRAIN TUBE 
(VIOLET)

CONDENSATE
TRAP

COLLECTOR BOX 
EXTENSION 
DRAIN TUBE

DRAIN TUBE
COUPLING

A94215

Fig. 7—Downflow Tube Configuration

(Left-Hand Trap Installation)

A. Condensate Trap Location

The condensate trap must be removed from the factory-installed
blower shelf location and relocated in selected application location
as shown in Fig. 2, 7, or 8.

To relocate condensate trap from the blower shelf to desired
location, perform the following:

1. Remove 3 tubes connected to condensate trap.

2. Remove trap from blower shelf by gently pushing tabs
inward and rotating trap.

3. Remove casing hole filler cap from casing hole. (See Fig. 2,
7, or 8.)

4. Install casing hole filler cap into blower shelf hole where
trap was removed.

5. Install condensate trap into desired casing hole by inserting
tube connection stubs through casing hole and rotating until
tabs snap into locking position.

B. Condensate Trap Tubing
NOTE: See Fig. 7 or 8 or tube routing label on main furnace door

to check for proper connections.

1. Collector Box Drain Tube
a. Remove factory-installed plug from LOWER collector

box drain tube (blue and white striped label).

b. Install removed clamp and plug into UPPER collector

box drain tube (blue label) which was connected to
condensate trap.

c. Connect LOWER collector box drain connection to

condensate trap.
(1.) Condensate Trap Located on Left Side of Casing

(a.) Connect LOWER collector box drain tube

(blue and white striped label) to condensate
trap. Tube does not need to be cut.

A94216

Fig. 8—Downflow Tube Configuration

(Right-Hand Trap Installation)

(b.) Clamp tube to prevent any condensate leakage.

(2.) Condensate Trap Located on Right Side of Casing

(a.) Install drain tube coupling (factory-supplied in

loose parts bag) into collector box drain tube
(blue and white striped label) which was pre­viously plugged.

(b.) Connect larger diameter drain tube (factory-

supplied in loose parts bag) to drain tube
coupling, extending collector box drain tube
for connection to condensate trap.

(c.) Route extended collector box drain tube be-

tween gas valve and inlet housing as shown in

Fig. 8.
(d.) Determine appropriate length and cut.
(e.) Connect to condensate trap.
(f.) Clamp tube to prevent any condensate leakage.

2. Inducer Housing Drain Tube
a. Remove factory-installed cap and clamp from LOWER

inducer housing drain connection.

b. Remove and discard UPPER (molded) inducer housing

drain tube which was previously connected to conden­sate trap.

c. Install cap and clamp on UPPER inducer housing drain

connection where molded drain tube was removed.

d. Use inducer housing drain tube (violet label and factory-

supplied in loose parts bag) to connect LOWER inducer
housing drain connection to the condensate trap.

e. Connect inducer housing drain connection to condensate

trap.
(1.) Condensate Trap Located on Left Side of Casing

—7—

(a.) Determine appropriate length and cut.
(b.) Connect tube to condensate trap.
(c.) Clamp tube to prevent any condensate leakage.

(2.) Condensate Trap Located on Right Side of Casing

(a.) Route inducer housing drain tube (violet label)

between gas valve and inlet housing behind

collector box drain tube.
(b.) Determine appropriate length and cut.
(c.) Connect tube to condensate trap.
(d.) Clamp tube to prevent any condensate leakage.

3. Relief Port Tube
Refer to Pressure Switch Tubing section for connection

procedure.

C. Condensate Trap Field Drain Attachment

Refer to Condensate Drain section for recommendations and
procedures.

D. Pressure Switch Tubing

One collector box pressure tube (pink label) is factory connected to
the pressure switch for use when furnace is installed in UPFLOW
or HORIZONTAL LEFT applications. This tube MUST be dis­connected and used for the condensate trap relief port tube. The
other collector box pressure tube (green label) which was factory
connected to the condensate trap relief port connection MUST be
connected to the pressure switch in DOWNFLOW or HORIZON­TAL RIGHT applications.

NOTE: See Fig. 7 or 8 or tube routing label on main furnace door
to check for proper connections.

Relocate tubes as described below.

1. Disconnect collector box pressure tube (pink label) attached
to pressure switch.

2. Use small diameter tube (factory-supplied in loose parts
bag) to extend collector box pressure tube (green label)
which was previously connected to condensate trap relief
port connection.

3. Connect collector box pressure tube (green label) to pres­sure switch connection labeled COLLECTOR BOX.

4. Use remaining small diameter tube (factory-supplied in
loose parts bag) to extend collector box pressure tube (pink
label) which was previously connected to pressure switch.

5. Route this extended tube (pink label) to condensate trap
relief port connection.

6. Determine appropriate length, cut, and connect tube.

7. Clamp tube to relief port connection.

E. Condensate Trap Freeze Protection

Refer to Condensate Drain Protection section for recommenda­tions and procedures.

IV. HORIZONTAL LEFT (SUPPLY-AIR DISCHARGE)
APPLICATIONS

A horizontal left furnace application is where furnace blower is
located to the right of combustion and controls section of furnace
and conditioned air is discharged to the left.

CAUTION: Local codes may require a drain pan under
entire furnace and condensate trap when a condensing
furnace is used in an attic application or over a finished
ceiling.

PLUG

CAP

AUXILIARY "J" BOX
RELOCATED HERE

CONDENSATE

RELOCATE TUBE BETWEEN BLOWER SHELF AND INDUCER HOUSING FOR

TRAP

COLLECTOR BOX

EXTENSION TUBE

COLLECTOR

BOX EXTENSION

DRAIN TUBE

DRAIN TUBE COUPLING

COLLECTOR BOX TUBE (PINK)

040, 060, AND 080 HEATING INPUT FURNACES

COLLECTOR BOX
DRAIN TUBE
(BLUE AND WHITE STRIPED)



Fig. 9—Horizontal Left Tube Configuration

COLLECTOR BOX
TUBE (GREEN)

INDUCER HOUSING
DRAIN TUBE (VIOLET)

COLLECTOR BOX
DRAIN TUBE (BLUE)

A93353

—8—

NOTE: In Canada, installations shall be in accordance with
current NSCNGPIC and/or local codes.

NOTE: The auxiliary junction box (J-box) MUST be relocated to
opposite side of furnace casing. (See Fig. 9.) See Electrical
Connection section for J-box relocation.

A. Condensate Trap Location

The condensate trap must be removed from the factory-installed
blower shelf location and relocated in selected application location
as shown in Fig. 2 or 9.

To relocate condensate trap from the blower shelf to desired
location, perform the following:

1. Remove 3 tubes connected to condensate trap.

2. Remove trap from blower shelf by gently pushing tabs
inward and rotating trap.

3. Remove casing hole filler cap from casing hole. (See Fig. 2
or 9.)

4. Install casing hole filler cap into blower shelf hole where
trap was removed.

5. Install condensate trap into casing hole by inserting tube
connection stubs through casing hole and rotating until tabs
snap into locking position.

B. Condensate Trap Tubing
NOTE: See Fig. 9 or tube routing label on main furnace door to

check for proper connections.

1. Collector Box Drain Tube
a. Install drain tube coupling (factory-supplied in loose

parts bag) into collector box drain tube (blue label)
which was previously connected to condensate trap.

b. Connect large diameter drain tube and clamp (factory-

supplied in loose parts bag) to drain tube coupling,
extending collector box drain tube.

c. Route extended tube (blue label) to condensate trap and

cut to appropriate length.

d. Clamp tube to prevent any condensate leakage.

2. Inducer Housing Drain Tube
a. Remove and discard LOWER (molded) inducer housing

drain tube which was previously connected to conden­sate trap.

b. Use inducer housing drain extension tube (violet label

and factory-supplied in loose parts bag) to connect
LOWER inducer housing drain connection to the con-

densate trap.
c. Determine appropriate length, cut, and connect tube.
d. Clamp tube to prevent any condensate leakage.

3. Relief Port Tube
a. Use small diameter tube (factory-supplied in loose parts

bag) to extend collector box tube (green label) which
was previously connected to the condensate trap.

b. Route extended collector box pressure tube to relief port

connection on the condensate trap.
c. Determine appropriate length, cut, and connect tube.
d. Clamp tube to prevent any condensate leakage.

C. Condensate Trap Field Drain Attachment

Refer to Condensate Drain section for recommendations and
procedures.

D. Pressure Switch Tubing

The LOWER collector box pressure tube (pink label) is factory
connected to the pressure switch and should not require any
modification.

NOTE: See Fig. 9 or tube routing label on main furnace door to
check for proper connections.

E. Condensate Trap Freeze Protection

Refer to Condensate Drain Protection section for recommenda­tions and procedures.

F. Construct a Working Platform

Construct working platform where all required furnace clearances
are met. (See Fig. 3 and 10.)

CAUTION: The condensate trap MUST be installed
below furnace. See Fig. 4 for dimensions. The drain
connection to condensate trap must also be properly
sloped to an open drain.

NOTE: Combustion-air and vent pipes are restricted to a mini­mum length of 5 ft. (See Table 5.)

NOTE: A 12-in. minimum horizontal pipe section is recom­mended with short (5 to 8 ft) vent systems. This recommendation
is to reduce excessive condensate droplets from exiting the vent
pipe. (See Fig. 10 or 29.)

V. HORIZONTAL RIGHT (SUPPLY-AIR DISCHARGE)
APPLICATIONS

A horizontal right furnace application is where furnace blower is
located to the left of combustion and controls section of furnace
and conditioned air is discharged to the right.

CAUTION: Local codes may require a drain pan under
entire furnace and condensate trap when a condensing
furnace is used in attic application or over a finished
ceiling.

NOTE: In Canada, installations shall be in accordance with
current NSCNGPIC Installation Codes and/or local codes.

A. Condensate Trap Location

The condensate trap must be removed from the factory-installed
blower shelf location and relocated in selected application location
as shown in Fig. 2 or 11.

To relocate condensate trap from the blower shelf to desired
location, perform the following:

1. Remove 3 tubes connected to condensate trap.

2. Remove trap from blower shelf by gently pushing tabs
inward and rotating trap.

3. Remove casing hole filler cap from casing hole. (See Fig. 2
or 11.)

4. Install casing hole filler cap into blower shelf hole where
trap was removed.

5. Install condensate trap into casing hole by inserting tube
connection stubs through casing hole and rotating until tabs
snap into locking position.

B. Condensate Trap Tubing
NOTE: See Fig. 11 or tube routing label on main furnace door to

check for proper connections.

1. Collector Box Drain Tube
a. Remove factory-installed plug from LOWER collector

box drain tube (blue and white striped label).

b. Install removed clamp and plug into UPPER collector

box drain tube (blue label) which was previously con­nected to condensate trap.

c. Connect LOWER collector box drain tube (blue and

white striped label) to condensate trap. Tube does not
need to be cut.

—9—

MANUAL

SHUTOFF

GAS VALVE

COMBUSTION – AIR

SEDIMENT
TRAP

INTAKE

5 3⁄4″

CONDENSATE
TRAP

VENT



30″ MIN
WORK AREA

DRAIN

A 12-IN. MIN HORIZONTAL PIPE
SECTION IS RECOMMENDED WITH
SHORT (5 TO 8 FT) VENT SYSTEMS
TO REDUCE EXCESSIVE
CONDENSATE DROPLETS FROM
EXITING THE VENT PIPE.

ACCESS OPENING
FOR TRAP

NOTE: LOCAL CODES MAY REQUIRE A DRAIN PAN UNDER THE

FURNACE AND CONDENSATE TRAP WHEN A CONDENSING
FURNACE IS INSTALLED ABOVE FINISHED CEILINGS.

Fig. 10—Attic Location and Working Platform

d. Clamp tube to prevent any condensate leakage.

2. Inducer Housing Drain Tube
a. Remove factory-installed cap and clamp from LOWER

inducer housing drain connection.

b. Remove and discard UPPER (molded) inducer housing

drain tube which was previously connected to conden­sate trap.

c. Install cap and clamp on UPPER inducer housing drain

connection where molded drain tube was removed.

d. Use inducer housing drain extension tube (violet label

and factory-supplied in loose parts bag) to connect
LOWER inducer housing drain connection to conden­sate trap.

e. Determine appropriate length, cut, and connect tube to

condensate trap.

f. Clamp tube to prevent any condensate leakage.

3. Relief Port Tube
Refer to Pressure Switch Tubing section for connection

procedure.

C. Condensate Trap Field Drain Attachment

Refer to Condensate Drain section for recommendations and
procedures.

D. Pressure Switch Tubing

One collector box pressure tube (pink label) is factory connected to
the pressure switch for use when furnace is installed in UPFLOW
or HORIZONTAL LEFT applications. This tube MUST be dis­connected and used for the condensate trap relief port tube. The

A93031

other collector box pressure tube (green label) which was factory
connected to the condensate trap relief port connection MUST be
connected to the pressure switch in DOWNFLOW or HORIZON­TAL RIGHT applications.

NOTE: See Fig. 11 or tube routing label on main furnace door to
check for proper connections.

Relocate tubes as described below.

1. Disconnect collector box pressure tube (pink label) attached
to pressure switch.

2. Use small diameter tube (factory-supplied in loose parts
bag) to extend collector box pressure tube (green label)
which was previously connected to condensate trap relief
port connection.

3. Connect collector box pressure tube (green label) to pres­sure switch connection labeled COLLECTOR BOX.

4. Use remaining small diameter tube (factory-supplied in
loose parts bag) to extend collector box pressure tube (pink
label) which was previously connected to pressure switch.

5. Route this extended tube (pink label) to condensate trap
relief port connection.

6. Determine appropriate length, cut, and connect tube.

7. Clamp tube to relief port connection.

E. Condensate Trap Freeze Protection

Refer to Condensate Drain Protection section for recommenda­tions and procedures.

F. Construct a Working Platform

Construct working platform where all required furnace clearances
are met. (See Fig. 3 and 10.)

—10—

CAP

PLUG

COLLECTOR BOX DRAIN TUBE 

(BLUE AND WHITE STRIPED)

INDUCER HOUSING

DRAIN TUBE (VIOLET)

COLLECTOR BOX

EXTENSION TUBE

Fig. 11—Horizontal Right Tube Configuration

COLLECTOR BOX DRAIN TUBE (BLUE)

COLLECTOR BOX TUBE (GREEN)

COLLECTOR BOX TUBE (PINK)

CONDENSATE
TRAP

A93354

CAUTION: The condensate trap MUST be installed
below furnace. See Fig. 4 for dimensions. The drain
connection to condensate trap must also be properly
sloped to an open drain.

NOTE: Combustion-air and vent pipes are restricted to a mini­mum length of 5 ft. (See Table 5.)

NOTE: A 12-in. minimum horizontal pipe section is recom­mended with short (5 to 8 ft) vent systems. This recommendation
is to reduce excessive condensate droplets from exiting the vent
pipe. (See Fig. 10 or 29.)

LOCATION

I. GENERAL

When a furnace is installed so that supply ducts carry air to areas
outside the space containing the furnace, return air must also be
handled by ducts sealed to furnace casing. The ducts terminate
outside the space containing the furnace to ensure there will not be
a negative pressure condition within equipment room or space.
Furnace may be located in a confined space without special
provisions for dilution or ventilation air. This furnace must be
installed so electrical components are protected from water.

Locate furnace as close to center of air distribution system as
possible.

Locate furnace so combustion-air pipe lengths are not exceeded.
Refer to Table 5.

LEVEL (0″)

TO

1

⁄2″ MAX

UPFLOW OR DOWNFLOW HORIZONTAL

FRONT

LEVEL (0″)

TO

1

⁄2″ MAX

FRONT

A93025

NOTE: For proper furnace operation, install furnace so that it is
level or pitched forward within 1/2 in. to ensure proper condensate
drainage from secondary heat exchangers.

CAUTION: If these furnaces are used during construc­tion when adhesives, sealers, and/or new carpets are
being installed, make sure all combustion and circulating
air requirements are followed. If operation of furnace is
required during construction, use clean outside air for
combustion and ventilation. Compounds of chlorine and
fluorine, when burned with combustion air, form acids
which will cause corrosion of heat exchangers. Some of
these compounds are found in paneling, dry wall adhe­sives, paints, thinners, masonry cleaning materials, and
many other solvents commonly used in construction
process.
Excessive exposure to contaminated combustion air will
result in safety and performance related problems.

Provide ample space for servicing and cleaning. Always comply
with minimum fire protection clearances shown on unit’s clear­ance to combustibles label. (See Fig. 3.) Locate furnace where
available electric power and gas supplies meet specifications on
furnace rating plate.

—11—

FRONT

°F °F

RETURN
AIR

MAX 85°F MIN 55°F

A93042

NOTE: These furnaces are designed for a minimum continuous
return-air temperature of 60°F or intermittent operation down to 55°F
such as when used with a night setback thermostat. Return-air
temperature must not exceed a maximum of 85°F. Failure to follow
these return-air temperature limits may affect reliability of heat
exchangers, motors, and controls.

FRONT

B
A
C
K

BACK

32°F MINIMUM INSTALLED
AMBIENT OR FREEZE
PROTECTION REQUIRED

A93058

CAUTION: If these furnaces are installed in an uncon­ditioned space where ambient temperatures may be 32°F
or lower, freeze protection measures must be taken.

III. FURNACE LOCATION RELATIVE TO COOLING
EQUIPMENT

The cooling coil must be installed parallel with or on downstream
side of furnace to avoid condensation in heat exchanger. When
installed parallel with a furnace, dampers or other means used to
control flow of air must prevent chilled air from entering furnace.
If dampers are manually operated, they must be equipped with a
means to prevent operation of either unit unless damper is in
full-heat or full-cool position.

IV. HAZARDOUS LOCATIONS

FRONT

A93043

WARNING: Do not install furnace on its back. Safety
control operation will be adversely affected. Never con­nect return-air ducts to back of furnace. Failure to follow
this warning could result in fire, personal injury, or death.

II. LOW-FIRE ONLY INSTALLATION

This 355MAV furnace can be installed to operate in the low-fire
only heating mode when sized using the low-fire heating capacity.
This is accomplished by placing setup switch SW-2 in the ON
position to provide only low-fire-heat operation. See Fig. 25 and
Table 9. With this setup, high-fire operation will not occur.

When the model no. on the furnace rating plate is followed by an
asterisk (*), the furnace has an alternate low-fire only efficiency
rating as listed in the GAMA and CEC directories. This alternate
rating will be listed as the furnace model number followed by an
(-L) suffix.

CAUTION: The furnace can operate in the high-fire
mode when certain fault conditions occur. The following
precautions should be taken:

1. Size gas piping based on the high-fire input.

2. Check the high-fire input and adjust it per the main
literature instructions.

NEVER assume the high-fire input rate is not important
for low-fire-only installation.

A93044

WARNING: When furnace is installed in a residential
garage, it must be installed so that burners and ignition
sources are located a minimum of 18 in. above floor. The
furnace must be located or protected to avoid physical
damage by vehicles. When furnace is installed in a public
garage, airplane hangar, or other building having a
hazardous atmosphere, unit must be installed in accor­dance with requirements of National Fire Protection
Association, Inc.

—12—

INSTALLATION

FURNACE

PLENUM

I. LEVELING LEGS (IF DESIRED)

When furnace is used in upflow position with side inlet(s), leveling
legs may be desired. (See Fig. 12.) Install field-supplied,
corrosion-resistant 5/16-in. machine bolts and nuts.

5

⁄16″

5

⁄16″

1 3⁄4″

3

⁄4″

1

5

⁄16″

5

⁄16″

1 3⁄4″

1 3⁄4″

A89014

Fig. 12—Leveling Legs

NOTE: The maximum length of bolt should not exceed 1-1/2 in.

1. Position furnace on its back. Locate and drill a 5/16-in.
diameter hole in each bottom corner of furnace. (See Fig.

12.) Holes in bottom closure panel may be used as guide
locations.

2. For each hole, install nut on bolt and then install bolt and
nut in hole. (Install flat washer if desired.)

3. Install another nut on other side of furnace base. (Install flat
washer if desired.)

4. Adjust outside nut to provide desired height, and tighten
inside nut to secure arrangement.

NOTE: Bottom closure must be used when leveling legs are used.
See Bottom Closure Panel section.

A

HOLE IN

FLOOR

B

A73382

OPENING DIMENSIONS (IN.)

FURNACE

CASING WIDTH

17-1/2 16-7/16 19-5/8 19-7/16

21 19-7/8 19-5/8 19-7/16

24-1/2 23-7/16 19-5/8 19-7/16

* These dimensions apply when a model CB or CD Evaporator Coil casing is
to be installed.

A

Heat Only Heat/Cool*

B

Fig. 13—Floor Opening in Concrete Slab

LEVEL (0″)

TO

1

⁄2″ MAX

UPFLOW OR DOWNFLOW HORIZONTAL

FRONT

LEVEL (0″)

TO

1

⁄2″ MAX

NOTE: For proper furnace operation, install furnace so that it is
level or pitched forward within 1/2 in. to ensure proper condensate
drainage from secondary heat exchangers.

II. INSTALLATION ON A CONCRETE SLAB

1. Construct hole in floor per dimensions in Fig. 13.

2. Place plenum and furnace as shown in Fig. 14.

III. INSTALLATION ON A COMBUSTIBLE FLOOR
(DOWNFLOW APPLICATIONS)

1. Cut and frame hole in floor per dimensions in Installation
Instructions packaged with downflow subbase kit.

FRONT

A93025

A73383

Fig. 14—Furnace on a Concrete Slab

(Non-Garage Installation)

NOTE: Remove furnace perforated, discharge duct flanges when

they interfere with mating flanges on coil on downflow subbase.
To remove furnace perforated, discharge duct flange, use wide
duct pliers or duct flange tool to bend flange back and forth until
it breaks off. Be careful of sharp edges. (See Fig. 15.)

WARNING: Do not bend duct flanges inward as shown
in Fig. 15. This will affect airflow across heat exchangers
and may cause limited cycling or premature heat ex­changer failure. Remove duct flange completely or bend
it inward a minimum of 210° as shown in Fig. 15.

2. When complete, downflow subbase, plenum, and furnace
(or coil casing when used) should be installed as shown in
Fig. 16.

—13—

PERFORATED
DISCHARGE DUCT
FLANGE

NO

Factory-supplied washable framed filters are shipped in blower
compartment. Determine location for filter and relocate filter
retaining wire if necessary. See Table 1 to determine correct filter
size for desired filter location. Table 1 indicates filter size,
location, and quantity shipped with this furnace. See Fig. 2 for
location and size of bottom and side return-air openings.

210°
MIN

Fig. 15—Duct Flanges

FURNACE

(OR COIL CASING

WHEN USED)

DOWNFLOW

SUBBASE

SHEET METAL

PLENUM

YES

YES

A93029

TABLE 1—FILTER INFORMATION

FURNACE

CASING

WIDTH (IN.)

17-1/2 (1) 16 X 25 X 1† (1) 16 X 25 X 1 Cleanable

21 (1) 16 X 25 X 1 (1) 20 X 25 X 1† Cleanable

24-1/2 (2) 16 X 25 X 1† (1) 24 X 25 X 1 Cleanable

* Filters can be field modified by cutting frame as marked and folding to desired
size. Alternate sizes can be ordered from your distributor or dealer.
† Factory-provided with furnace.

FILTER SIZE (IN.)*

Side Return Bottom Return

FILTER TYPE

FRAMED

CAUTION: Air delivery above 1800 CFM requires that

both sides, a combination of 1 side and bottom, or bottom
only of furnace be used for return air.

NOTE: Side return-air openings can ONLY be used in UPFLOW
configurations. Install filter(s) as shown in Fig. 18.

For bottom return-air applications, filter may need to be cut to fit
some furnace widths. Install filter as shown in Fig. 19.

NOTE: Remove and discard bottom closure panel when bottom
inlet is used.

VI. BOTTOM CLOSURE PANEL

These furnaces are shipped with bottom enclosure panel installed
in bottom return-air opening. This panel MUST be in place when
side return air is used.

To remove bottom closure panel, perform following:

Fig. 16—Furnace, Plenum, and Subbase Installed on a

Combustible Floor

IV. INSTALLATION IN HORIZONTAL APPLICATIONS

These furnaces can be installed horizontally in either horizontal
left or right discharge position. In a crawlspace, furnace can either
be hung from floor joist or installed on suitable blocks or pad.
Furnace can be suspended from each corner by hanger bolts. (See
Fig. 17.) Cut hanger bolts (4 each 3/8-in. all-thread rod) to desired
length. Use 1 X 3/8-in. flat washers, 3/8-in. lockwashers, and
3/8-in. nuts on hanger rods as shown in Fig. 17. Dimples are
provided for hole locations. (See Fig. 2.)

CAUTION: The entire length of furnace MUST be
supported when furnace is used in a horizontal position to
ensure proper draining.

V. FILTER ARRANGEMENT

CAUTION: Never operate unit without a filter or with

blower access panel removed.

A78651

1. Tilt or raise furnace and remove 2 screws holding front
filler panel. (See Fig. 20.)

2. Rotate front filler panel downward to release holding tabs.

3. Remove bottom closure panel.

4. Reinstall front filler panel and screws.

VII. GAS PIPING

Gas piping must be installed in accordance with national and local
codes. Refer to current edition of NFGC. Canadian installations
must be made in accordance with NSCNGPIC and all authorities
having jurisdiction. Gas supply line should be a separate line
running directly from meter to furnace, if possible. Refer to Table
2 for recommended gas pipe sizing. Risers must be used to connect
to furnace and to meter. Support all gas piping with appropriate
straps, hangers, etc. Use a minimum of 1 hanger every 6 ft. Joint
compound (pipe dope) should be applied sparingly and only to
male threads of joints. Pipe dope must be resistant to propane gas.

—14—

3

⁄8-IN. ROD

ANGLE
IRON OR
EQUIVALENT

(B)

(A) ROD LOCATION

USING DIMPLE
LOCATORS
(SEE DIMENSIONAL
DWG FOR
LOCATIONS)

(A) PREFERRED ROD LOCATION

(B) ALTERNATE ROD LOCATION

WASHABLE

FILTER

5 3⁄4″

(B)

(A)

DRAIN

(A)

(B)

3

/8-IN. HEX NUT

& WASHER (4)

REQD PER ROD

NOTES:

(A)

(B)

1. A 1 In. clearance minimum between top of

13

ALTERNATE SUPPORT
LOCATION FROM BACK

furnace and combustible material.


2. The entire length of furnace must be
supported when furnace is used in horizontal
position to ensure proper drainage.

Fig. 17—Crawlspace Horizontal Application

TABLE 2—MAXIMUM CAPACITY OF PIPE*

NOMINAL

IRON

PIPE
SIZE

(IN.)

1/2 0.622 175 120 97 82 73
3/4 0.824 360 250 200 170 151

1 1.049 680 465 375 320 285

1-1/4 1.380 1400 950 770 660 580

FILTER
RETAINER

1-1/2 1.610 2100 1460 1180 990 900

* Cubic ft of gas per hr for gas pressures of 0.5 psig (14-in. wc) or less, and a
pressure drop of 0.5-in. wc (based on a 0.60 specific gravity gas). Ref: Table
10-2 NFPA 54-1992.

/16-IN. MAX

INTERNAL
DIAMETER

(IN.)

ALTERNATE SUPPORT
LOCATION 4-IN. MIN
8-IN. MAX

A93304

LENGTH OF PIPE (FT)

10 20 30 40 50

Fig. 18—Filter Installed for Side Inlet

A93045

CAUTION: Connect gas pipe to furnace using a backup
wrench to avoid damaging gas controls.

WARNING: Gas valve knob MUST be facing forward
or tilted upward. Failure to follow this warning could
result in property damage or death.

—15—

WARNING: Never purge a gas line into a combustion
chamber. Never use matches, candles, flame, or other
sources of ignition for purpose of checking leakage. Use
a soap-and-water solution to check for leakage. A failure
to follow this warning could result in fire, explosion,
personal injury, or death.

3″

1

24

/2″

WARNING: Use proper length of pipe to avoid stress on
gas control manifold. Failure to follow this warning could
result in a gas leak resulting in fire, explosion, personal
injury, or death.

Install a sediment trap in riser leading to furnace. Trap can be
installed by connecting a tee to riser leading to furnace so
straight-through section of tee is vertical. Then connect a capped
nipple into lower end of tee. Capped nipple should extend below
level of gas controls. Place a ground joint union between gas
control manifold and manual gas shutoff valve. (See Fig. 21.)

1″

FIELD-SUPPLIED
FILTER FILLER
STRIP FOR 

1

⁄2-IN. WIDE 

17
CASINGS ONLY.
INSTALL UNDER
FILTER.

WASHABLE
FILTER

FILTER
SUPPORT

FILTER
RETAINER

Fig. 19—Bottom Filter Arrangement

BOTTOM
CLOSURE
PANEL

FRONT FILLER
PANEL

Fig. 20—Removing Bottom Closure Panel

A93321

A93047

GAS
SUPPLY

MANUAL
SHUTOFF
VALVE

SEDIMENT
TRAP

UNION

A93324

Fig. 21—Typical Gas Pipe Arrangement

CAUTION: If a flexible connector is required or al-

lowed by authority having jurisdiction, black iron pipe
shall be installed at gas valve and extend a minimum of
2 in. outside furnace casing.

An accessible manual shutoff valve MUST be installed upstream
of furnace gas controls and within 6 ft of furnace. A 1/8-in. NPT
plugged tapping, accessible for test gage connection, MUST be
installed immediately upstream of gas supply connection to
furnace and downstream of manual shutoff valve.

NOTE: The gas valve inlet press tap connection is suitable to use
as test gage connection providing test pressure DOES NOT exceed
maximum 0.5 psig (14-in. wc) stated on gas valve. (See Fig. 46.)
Piping should be pressure tested in accordance with local and
national plumbing and gas codes before furnace has been attached.
In Canada, refer to current edition of NSCNGPIC. If pressure
exceeds 0.5 psig (14-in. wc), gas supply pipe must be disconnected
from furnace and capped before pressure test. If test pressure is
equal to or less than 0.5 psig (14-in. wc), close manual shutoff
valve located on gas valve before test. It is recommended that
ground joint union be loosened before pressure testing. After all
connections have been made, purge lines and check for leakage.

ELECTRICAL CONNECTIONS

See Fig. 22 for field wiring diagram showing typical field 115-v
and 24-v wiring. Check all factory and field electrical connections
for tightness.

—16—

115-VOLT

SINGLE

PHASE

115-VOLT FIELD-

SUPPLIED

FUSED

DISCONNECT

FIVE

WIRE

THREE-WIRE

NOTE 5

WCR GY

THERMOSTAT
TERMINALS

HEATING

ONLY

AUXILIARY
J-BOX

FURNACE

CONTROL

CENTER

W/W1

NOTE

W2

3

R

G

C



Y/Y2

24-VOLT
TERMINAL
BLOCK

NOTE 1

TWO WIRE

NOTES:

1.

Connect Y or Y/Y2 terminal as shown for proper cooling operation.

2.

Proper polarity must be maintained for 115-volt wiring.

3.

Use W2 with 2-stage thermostat when zoning.

4.

If any of the original wire, as supplied, must be replaced, use



same type or equivalent wire.

5.

Some thermostats require a "C" terminal connection as shown.

GND

GND

CONDENSING

Fig. 22—Heating and Cooling Application Wiring Diagram

FIELD 24-VOLT WIRING
FIELD 115-, 208/230-, 460-VOLT WIRING
FACTORY 24-VOLT WIRING
FACTORY 115-, 208/230-, 460-VOLT WIRING

FIELD-SUPPLIED

FUSED DISCONNECT

208/230- OR
460-VOLT
THREE
PHASE

GND

208/230-
VOLT
SINGLE

GND

PHASE

UNIT

A95199

TABLE 3—ELECTRICAL DATA

UNIT
SIZE

VOLTS—
HERTZ—

PHASE

OPERATING

VOLTAGE RANGE

Maximum* Minimum*

MAXIMUM

UNIT

AMPS

UNIT

AMPACITY†

042040 115—60—1 127 104 8.9 12.0 14 31 15
042060 115—60—1 127 104 8.9 12.0 14 31 15
042080 115—60—1 127 104 8.9 12.0 14 31 15

→060080 115—60—1 127 104 13.8 17.9 12 32 20

060100 115—60—1 127 104 13.8 18.1 12 32 20

→060120 115—60—1 127 104 11.2 14.7 14 25 15

* Permissible limits of voltage range at which unit will operate satisfactorily.
† Unit ampacity = 125 percent of largest operating component’s full load amps plus 100 percent of all other potential operating components’ (EAC, humidifier, etc.) full load
amps.
‡ Length shown is as measured 1 way along wire path between unit and service panel for maximum 2 percent voltage drop.
** Time-delay fuse is recommended.

apply. For Canadian installations, all electrical connections must
be made in accordance with Canadian Electrical Code CSA C22.1
or subauthorities having jurisdiction.

→

WARNING:

Blower access panel door switch opens 115-v power to
control center. No component operation can occur. Do

MINIMUM

WIRE

SIZE

MAXIMUM WIRE

LENGTH (FT)‡

MAXIMUM FUSE OR

CKT BKR AMPS**

not bypass or close switch with panel removed. Failure to
follow this warning could result in personal injury or
death.

ELECTRIC

DISCONNECT

CAUTION: Furnace control must be grounded for
proper operation or control will lock out. Control is
grounded through green wire routed to gas valve and

SWITCH

COPPER

WIRE ONLY

burner box screw.

ALUMINUM

WIRE

I. 115-V WIRING

Before proceeding with electrical connections, make certain that
voltage, frequency, and phase correspond to that specified on unit
rating plate. Also, check to be sure that service provided by utility

CAUTION: Do not connect aluminum wire between
disconnect switch and furnace. Use only copper wire.

is sufficient to handle load imposed by this equipment. Refer to
rating plate or Table 3 for equipment electrical specifications.

Make all electrical connections in accordance with NEC
ANSI/NFPA 70-1993 and any local codes or ordinances that might

Use a separate, fused branch electrical circuit containing a properly
sized fuse or circuit breaker for this furnace. See Table 3 for wire

A93033

—17—

SCHEMATIC DIAGRAM

(NATURAL GAS & PROPANE)

MTR1

6

412

12

10

PL7

EQUIPMENT GROUND

T 1

T 2

L2

L2

NOTE #2

L1

654

PL1

L1

ILK

TO 115 VAC FIELD DISCONNECT

P2

SEC-2

HSI

TRAN

24VAC

115VAC

P1

PL9

2

PL12

1

PL4

2

1

B2

HSIR

EAC

MTR2

8

6

3

14

16

PL13

PCB

NOTE #5

1

2

3

5

4

PL11

D.C.

POWER

SUPPLY

CPU2

SW - 4

EMER. HEAT

IND

NOTE #7

PL11

12345

6

PL10

B1 7

CPU1

12345

SEC-1

FU1

PL1-11

NOTE #6

PL1-9

EAC-1 EAC-2

ALS

LS

FRS

PL3

PL1-7

NOTE #3HPS

C

C

NO

PL2-4

LPS

PL2-2

C

FSE

NO

PL1-1

PL2-1

GV

M

P

HI

PCB

NOTE #5

PL1-10

PL1-2

SUPPLY

D.C. POWER

EAC

GVR

HUMR

DH

R

HUM

CPU1

G

W2

OM

Y/Y2

C

W/W1

CPU2

GVR

HSIR

HUMR

1. If any of the original equipment wire is replaced use wire rated for 105°C.

2. Use only copper wire between the disconnect switch and the furnace junction box (JB).

3. This wire must be connected to furnace sheet metal for control to prove flame.

4. Symbols are electrical representation only.

5. Solid lines, inside circuit board PCB are printed circuit board traces and are not depicted as shown in the legend.

6. Replace only with a 3 AMP fuse.

7. Inductor used on all 060 or -20 airflow units.

8. Blower-on delay, gas heating 60 seconds low heat, 35 seconds high heat, cooling or heat pump 2 seconds..

9. Blower-off delay, gas heating 90, 135, 180 or 225 seconds, cooling or heat pump 90 seconds.

A95088

322296-101 REV. A

Control will auto-reset after three hours.

10. Ignition-lockout will occur after four consecutive unsuccessful trials-for-ignition.

NOTES:

NOTE #2

FU2

FUSED DISCONNECT

SWITCH (WHEN REQ’D)

BLK

GRN

WHT

JB

BLK

WHT

GRN

ILK

PL7

MTR1

12104 612

NO

RED

BLUE

C

TRAN HPS

BLK

WHT

WHT

BLK

BLK

HSI

12

WHT
GRN

YEL

PL9

BRN

3

ORN

FSE

ALS

P

LS

GV

FRS

RED

BLK

BLU

C

RED

WHT

WHT
BLK

EAC2
EAC1

BRN

NO

LPS

C

YEL

P1

P2

HUMGR

ORN

1234

YEL

L1

L2

PL2

B2

B1

10 11

T 1

T 2

RED

9
8
7

PL4

BRN

2

1

ORN
YEL

456

123

1.5 AMP

PL1

WHT

WHT

3

BRN

GRN

HI

M

GRN

NOTE #3

WHT
BLK

RED
BRN

GRN

BLU

RED

Y/Y2

BLK

OM

W/W1CW2

5

WHT

BLUE

DH

SEC-1

SEC-2

5BLU
4YEL

3VIO

2ORN
1RED

RED

ORN
VIO
YEL
BLU

WHT
BLK

987654321

RED

PL3

RED
ORN

VIO

YEL
BLU

PL10

NOTE #6

FUSE

A/C AND CF

SWITCH

A/C AND CF

SWITCH

BLOWER

24VAC-3A

FU1

SELECTION CHART

POS.

SELECTION CHART

POS.

1

PL11

OFF-DELAY

SELECTION CHART

234

CF A/C

1

(1-4)

LEDS

1200

3

213

A/C CF A/C CF

213

5

90

78

DEFAULT

DEFAULT

SEC.

123 123

CFM

TON

OFF

OFF

NOTE #7

IND.

135

OFF

78

8
7
6

45
3

12

SW

(1-8)

CFM

1400

TON

3-1/2

213

OFF

600

CFM

TON2TON

1-1/2

213

OFF

1

PL11

SEC.

180

8

OFF

7

MZ

BPH
FLT

CFM

1600

4

TON

213

OFF

800

CFM

213

OFF

RED

PL12

3168

GRN

WHT
BLK

YEL

12543

SEC.

225

OFF

78

OFF-DELAY

BLOWER

COMP. TEST

32 1

EMER. HEAT

LOW HEAT

CFM

2000

5

TON

213

OFF

CFM

1000

TON

2-1/2

213

OFF

VIO

YEL

BLU

ORN

14

MTR2

SEC.

OFF

654

PL6

PL5

1

PL6 3-CIRCUIT COMM. CONNECTOR

PL7 12-CIRCUIT INDUCER MTR CONNECTOR

PL9 2-CIRCUIT HSI CONNECTOR

PL10 9-CIRCUIT BLOWER ADAPTER CONNECTOR

PL11 1-CIRCUIT INDUCTOR SPLICE CONNECTOR

PL12 5-CIRCUIT BLOWER POWER CONNECTOR

PL13 16-CIRCUIT BLOWER CTRL. CONNECTOR

SW1 MANUAL SWITCH, FAULT DISPLAY, SPST-(N.O.)

SW2 MANUAL SWITCH, LOW HEAT, SPST-(N.O.)

SW3 MANUAL SWITCH, BYPASS HUMIDIFIER, SPST-(N.O.)

JUNCTION

UNMARKED TERMINAL

PCB TERMINAL (FACTORY CONNECTED)

FACTORY WIRING (115 VAC)

FACTORY WIRING (24 VAC)

FIELD WIRING (115 VAC)

CONDUCTOR ON PCB

FIELD WIRING SCREW TERMINAL

TERMINAL BLOCK - MARKED TERMINAL

FIELD GROUND

EQUIPMENT GROUND

FIELD SPLICE

PCB TERMINAL (FIELD CONNECTION)

SW4 MANUAL SWITCH, EMERGENCY HEAT, SPST-(N.O.)

SW5 MANUAL SWITCH, MULTIPLE ZONE, SPST-(N.O.)

SW6 COMPONENT TEST, SPST-(N.O.)

SW7-8 MANUAL SWITCH, BLOWER OFF-DELAY, SPST-(N.O.)

TRAN TRANSFORMER - 115VAC/24VAC

→ Fig. 23—Wiring Diagram

PLUG RECEPTACLE

PCB

PL13

6

X

X

XX

JUMPERS

X

1-4 2-5 3-6

XX

XX

SIZE

042040

042060

042080

060100

060080

MODEL

060120

—18—

LEGEND

A/C AIR CONDITIONING (ADJUSTABLE TONNAGE)

ALS AUXILIARY LIMIT SWTICH OVERTEMP - MANUAL RESET SPST-(N.C)

CF CONTINUOUS FAN (ADJUSTABLE CFM)

CPU1 MAIN MICROPROCESSOR & CIRCUITRY

CPU2 IGNITION MICROPROCESSOR & CIRCUITRY

DH DEHUMIDIFICATION CONNECTION (24VAC .02 AMPS)

EAC-1 ELECTRONIC AIR CLEANER CONNECTION (115 VAC 1.5 AMP MAX.)

EAC-2 ELECTRONIC AIR CLEANER CONNECTION (COMMON)

FRS FLAME ROLLOUT SWITCH - MANUAL RESET, SPST-(N.C.)

FSE FLAME PROVING SENSOR ELECTRODE

FU1 FUSE, 3 AMP, AUTOMOTIVE BLADE TYPE, FACTORY INSTALLED

FU2 FUSE OR CIRCUIT BREAKER CURRENT INTERRUPT DEVICE (FIELD INSTALLED & SUPPLIED)

GV GAS VALVE

GVR GAS VALVE RELAY, DPST-(N.O.)

HI GAS VALVE HIGH STAGE OPERATOR

HPS HIGH HEAT PRESSURE SWITCH, SPST-(N.O.)

HSI HOT SURFACE IGNITOR (115 VAC)

HSIR HOT SURFACE IGNITOR RELAY, SPST-(N.O.)

HUM 24VAC HUMIDIFIER CONNECTION (.5 AMP. MAX.)

HUMR HUMIDIFIER RELAY, SPST-(N.O.)

ILK BLOWER ACCESS PANEL INTERLOCK SWITCH, SPST-(N.O.)

IND INDUCTOR (NOTE #7)

JB JUNCTION BOX

LEDS LIGHT EMITTING DIOES FOR STATUS CODES

LPS LOW HEAT PRESSSURE SWITCH, SPST-(N.O.)

LS LIMIT SWITCH, AUTO RESET, (N.C.)

MTR1 MOTOR (ICM) INDUCER

MTR2 MOTOR (ICM) BLOWER

PCB PRINTED CIRCUIT BOARD

PL1 11-CIRCUIT CONNECTOR

PL2 4-CIRCUIT PRESSURE SWITCH CONNECTOR

PL3 5-CIRCUIT BLOWER MTR CONNECTOR

PL4 2-CIRCUIT HSI CONNECTOR

PL5 6-CIRCUIT MODEL PLUG

size and fuse specifications. A disconnecting means must be
located within sight from and readily accessible to furnace.

NOTE: Proper polarity must be maintained for 115-v wiring. If
polarity is incorrect, control center fault code indicator light will
flash rapidly and furnace will NOT operate.

WARNING: The cabinet MUST have an uninterrupted
or unbroken ground according to NEC ANSI/NFPA
70-1993 and Canadian Electrical Code CSA C22.1 or
local codes to minimize personal injury if an electrical
fault should occur. This may consist of electrical wire or
conduit approved for electrical ground when installed in
accordance with existing electrical codes. Do not use gas
piping as an electrical ground. Failure to follow this
warning could result in electric shock, fire, or death.

J-BOX RELOCATION

1. Remove 2 screws holding auxiliary J-box. (See Fig. 24.)

2. Rotate J-box 180° and attach box to right side, using holes
provided.

A93051

Fig. 24—Relocating J-Box

CAUTION: If manual disconnect switch is to be

mounted on furnace, select a location where a drill or
fastener will not contact electrical or gas components.

II. 24-V WIRING

Make field 24-v thermostat connections at 24-v terminal block on
control center. Y wire from thermostat MUST be connected to Y
terminal on control center, as shown in Fig. 22, for proper cooling
operation. The 24-v terminal board is marked for easy connection
of field wiring. (See Fig. 23.) The 24-v circuit contains a 3-amp,
automotive-type fuse located on control center. (See Fig. 25.) Any
electrical shorts of 24-v wiring during installation, service, or
maintenance may cause fuse to blow. If fuse replacement is
required, use only a fuse of identical size (3 amp).

NOTE: Use AWG No. 18 color-coded copper thermostat wire for
lengths up to 100 ft. For wire lengths over 100 ft, use AWG No.
16 wire.

III. ACCESSORIES

1. Electronic Air Cleaner (EAC)
The control center EAC terminals are energized with 115v

(1.5-amp maximum) during blower operation.
a. Two extension leads are connected to the control center

EAC terminals to assist field installation of an EAC. (See
Fig. 25.) To use these leads, proceed with the following:

(1.) Strip EAC power lead insulation approximately

1/4-in.

(2.) Insert stripped end into factory-supplied black

lead’s butt connector and crimp to secure.

(3.) Strip EAC neutral lead insulation approximately

1/4-in.

(4.) Insert stripped end into factory-supplied white

leads’s butt connector and crimp to secure.

NOTE: If desired, cut butt connectors off factory leads and strip
insulation approximately 1/4-in and use field supplied wire nuts to
connect.

b. An alternate method to attach EAC lead to control center

is the following procedure:
(1.) Remove 2 screws securing the control box to

furnace blower shelf.

(2.) Remove and discard 2 factory-supplied leads from

control center EAC terminals.

(3.) Strip EAC power leads insulation approximately

1/8-in.

NOTE: The control center EAC terminals are sized for 12 gage
maximum, solid or stranded wire.

(4.) Route EAC leads through right-hand wire grommet.
(5.) Insert EAC stripped leads into control center EAC

terminals by depressing terminal’s arm with a
screwdriver or finger. (See Fig. 26.)

(6.) Reinstall control box to furnace blower shelf using

2 screws removed earlier.

2. Humidifier (HUM)
Screw terminals (HUM and Com) are provided for 24-v

humidifier connection. (See Fig. 23.) HUM terminal is
energized with 24v (0.5-amp maximum) after inducer
motor prepurge period.

NOTE: A field-supplied, 115-v controlled relay connected to
EAC terminals may be added if humidifier operation is desired
during blower operation.

3. Dehumidification (DH)
A 1/4-in. male quick-connect terminal is provided on

control center to attach a normally open (N/O) humidistat
contact when dehumidification is desired. (See Fig. 25.)
Connect humidistat to thermostat R terminal and DH
terminal on control center. A 15 percent reduction of
cooling airflow or constant fan airflow will occur when DH
terminal is energized and a single- or 2-speed "call for
cooling" is received.

DIRECT VENTING

The 355MAV Furnaces require a dedicated (one 355MAV furnace
only) direct vent system. In a direct vent system, all air for
combustion is taken directly from outside atmosphere, and all flue
products are discharged to outside atmosphere.

I. REMOVAL OF EXISTING FURNACES FROM
COMMON VENT SYSTEMS

If furnace being replaced was connected to a common vent system
with other appliances, these steps shall be followed with each
appliance remaining connected to common vent system placed in
operation, while other appliances remaining connected to common
vent system are not in operation:

1. Seal any unused openings in common vent system.

2. Visually inspect vent system for proper size and horizontal
pitch. Determine there is no blockage or restriction, leak­age, corrosion, and other deficiencies which could cause an
unsafe condition.

—19—

EAC-ELECTRONIC AIR
CLEANER TERMINALS

(115-VAC 1 AMP MAX)

MAIN BLOWER

CONTROL WIRE

CONNECTOR

CONTINUOUS

FAN (CF) SETUP

SWITCHES

TRANSFORMER

24-V CONNECTORS

COMMUNICATION

CONNECTOR

Fig. 25—Control Center

HOT SURFACE
IGNITOR CONNECTOR

HUM

RG

W/W1 Y/Y2

COM

W2

115-V
CONNECTORS

PRESSURE SWITCH
CONNECTOR

HUM-HUMIDIFIER
TERMINAL
(24-VAC 0.5 AMP MAX)

24-V THERMOSTAT
TERMINALS

24V

DEHUMIDIFIER (DH) 
CONNECTOR
3-AMP FUSE

STATUS AND DIAGNOSTIC
LED LIGHTS

AIR CONDITIONING
(A/C) SETUP SWITCH
SETUP SWITCHES
(SW) AND BLOWER
OFF DELAY SETUP
SWITCHES

MODEL PLUG

A93062

A93053

Fig. 26—EAC Terminals on Control Center

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

4. Follow lighting instructions and place appliance in opera­tion. Adjust thermostat so appliance operates continuously.

5. Test for flue gas spillage at drafthood relief opening after 5
minutes of main burner operation. Use flame of a match or
candle, etc.

6. After it has been determined that each appliance remaining
connected to common vent system properly vents when
tested as above, return doors, windows, exhaust fans,
fireplace dampers, any other gas burning appliances to their
previous condition of use.

7. If improper venting is observed during any of above tests,
common vent system must be corrected. Vent system or
vent connectors may need to be resized. For any other
appliances when resizing vent systems or vent connectors,
system or connector must be sized to approach minimum
size as determined using appropriate table found in Part 11
of NFGC or Section 5 of NSCNGPIC.

II. COMBUSTION-AIR AND VENT PIPING
A. General

Combustion-air and vent pipe fittings must conform to American
National Standards Institute (ANSI) standards and American
Society for Testing and Materials (ASTM) standards D1785
(schedule-40 PVC), D2665 (PVC-DWV), D2241 (SDR-21 and
SDR-26 PVC), D2661 (ABS-DWV), F628 (schedule-40 ABS), or
F891 (PVC-DWV cellular core). Pipe cement and primer must
conform to ASTM standards D2564 (PVC) or D2235 (ABS). See
Table 5 for maximum pipe lengths and Fig. 31, 32, 33, 34, and 35
for exterior piping arrangements.

In Canada construct all combustion-air and vent pipes for this unit
of CSA or ULC certified schedule-40 PVC, PVC-DWV or
ABS-DWV pipe and pipe cement. SDR pipe is NOT approved in
Canada.

NOTE: Furnace combustion-air and vent pipe connections are
sized for 2-in. pipe. Any pipe size change should be made outside
furnace casing in vertical pipe. (See Fig. 27.) This allows proper
drainage of vent condensate.

—20—

Combustion-air and vent pipes must terminate together in same
atmosphere pressure zone, either through roof or sidewall (roof
termination preferred), using accessory termination kit. See Table
4 for required clearances.

TABLE 4—COMBUSTION-AIR AND VENT PIPE

TERMINATION CLEARANCES

LOCATION

Above grade level or above
anticipated snow depth

Dryer vent 33
From plumbing vent stack 33
From any mechanical fresh

air intake
For furnaces with an input

capacity less than 100,000
Btuh–from any non­mechanical air supply (win­dows or doors which can
be opened) or combustion­air opening

For furnaces with an input
capacity greater than
100,000 Btuh–from any
non-mechanical air supply
(windows or doors which
can be opened) or
combustion-air opening

From service regulator
vent, electric and gas
meters, and relief equip­ment

Above grade when adjacent
to public walkway

* Horizontal distance.
† 18 in. above roof surface in Canada.
‡ 36 in. to electric meter in Canada only.

NOTES:

1. If installing 2 adjacent 355MAV Furnaces, refer to Multiventing and Vent
Terminations section for proper vent configurations.

2. When locating combustion-air and vent terminations, consideration must be
given to prevailing winds, location, and other conditions which may cause
recirculation of the appliance’s own flue products or the flue products of
adjacent vents. Recirculation can cause poor combustion, inlet condensate
problems, and accelerated corrosion of heat exchangers.

CLEARANCE (FT)

U.S.A. Canada

11†

16

11

13

4* 6‡

77

Furnace combustion-air and vent pipe connections must be at­tached as shown in Fig. 28. Combustion-air intake plug fitting and
inducer housing alternate vent cap may need to be relocated in
some applications.

FURNACE

A93083

Fig. 28—Combustion-Air and Vent Pipe Connections

CAUTION: When combustion-air pipe is installed

above a suspended ceiling, pipe must be insulated with
3/8-in. thick Armaflex-type insulation. Combustion-air
pipe should also be insulated when it passes through
warm, humid space.

CAUTION: When vent pipe is exposed to temperatures
below freezing, such as when it passes through an
unheated space or when a chimney is used as a raceway,
pipe must be insulated as shown in Table 6 with
Armaflex-type insulation.

CAUTION: Combustion air must not be taken from
inside structure because that air is frequently contami­nated by halogens, which include fluorides, chlorides,
bromides, and iodides. These elements are found in
aerosols, detergents, bleaches, cleaning solvents, salts, air
fresheners, adhesives, paint, and other household prod­ucts. Locate combustion-air inlet as far as possible from
swimming pool and swimming pool pump house.
Excessive exposure to contaminated combustion air will
result in safety and performance related problems.

NOT IN
HORIZONTAL
SECTION

PIPE DIAMETER

TRANSITION IN

VERTICAL SECTION

Fig. 27—Combustion-Air and Vent Pipe Diameter

Transition Location and Elbow Configuration

A93034

WARNING: Solvent cements are combustible. Keep
away from heat, sparks, and open flame. Use only in well
ventilated areas. Avoid breathing in vapor or allowing
contact with skin or eyes. Failure to follow this warning
could result in fire, property damage, personal injury, or
death.

—21—

WARNING: All combustion-air and vent pipes must be
airtight and watertight. Pipes must also terminate exactly
as shown in Fig. 31, 32, 33, 34, or 35. Failure to follow
this warning could result in property damage, personal
injury, or death.

NOTE: The minimum combustion-air and vent pipe length (each)
for these furnaces is 5 ft. Short pipe lengths (5-8 ft) may discharge
water droplets. These droplets may be undesirable, and a 12-in.
minimum horizontal pipe section is recommended, as shown in
Fig. 29, to reduce excessive droplets from exiting vent pipe outlet.

B. Combustion-Air and Vent Pipe Diameter

Determine combustion-air and vent pipe diameter.

1. Using Table 5, determine preliminary combustion-air pipe
diameter.

2. Using Table 5, determine preliminary vent pipe diameter.

3. Use largest diameter pipe determined in 1. and 2. above for
both pipes.

NOTE: Do not count elbows or pipe sections in terminations or
within furnace. See shaded areas in Fig. 31, 32, 33, 34, and 35.

EXAMPLE:

An 042080 size furnace located in Indianapolis, elevation 650
ft above sea level, could be installed in an application requiring

3 elbows and 17 ft of vent pipe, along with 5 elbows and 16 ft
of combustion-air pipe. Table 5 indicates this application would
allow a 1-1/2-in. diameter vent pipe, but require a 2-in.
diameter combustion air pipe (1-1/2-in. pipe is good for 20 ft
with 3 elbows, but only 10 ft with 5 elbows). Therefore, 2-in.
diameter pipe must be used for both vent and combustion-air
pipes since larger required diameter must always be used for
both pipes. If same installation were in Albuquerque, elevation
5250 ft above sea level, installation would require 2-in. vent
pipe and combustion-air pipe. At 5001- to 6000-ft elevation,
1-1/2-in. pipe is not allowed with 5 elbows, and 2-in. pipe is
good for 68 ft with 5 elbows.

C. Combustion-Air and Vent Pipe Attachment
NOTE: All pipe joints must be watertight except attachment of

combustion-air pipe to inlet housing connection since it may be
necessary to remove pipe for servicing.

1. Attach combustion-air pipe as follows:
a. Determine location of combustion-air intake pipe con-

nection to combustion-air intake housing as shown in
Fig. 28 for application.

b. Reposition combustion-air intake housing plug fitting in

appropriate unused intake housing connection.

c. Insert perforated disk assembly (factory supplied) in

intake housing where combustion-air intake pipe will be
connected.

VENT PIPE

HORIZONTAL TO ROOF HORIZONTAL TO SIDEWALL

12″ MIN

COMBUSTION-AIR PIPE

12″ MIN

VENT PIPE

COMBUSTION-AIR PIPE COMBUSTION-AIR PIPE

COMBUSTION-AIR PIPE

VENT PIPE

12″ MIN

12″ MIN

VENT PIPE

NOTE: A 12-in. minimum horizontal pipe section is recommended with

short (5 to 8 ft) vent systems. This recommendation is to reduce
excessive condensate droplets from exiting the vent pipe.

VERTICAL TO SIDEWALLVERTICAL TO ROOF

A93591

Fig. 29—Short Vent (5 to 8 Ft) System

—22—

ALTITUDE UNIT SIZE

0 to 2000

2001 to 3000

3001 to 4000

4001 to 5000‡

5001 to 6000‡

See notes on following page.

042040

042060
042080

→060080

060100

→060120**

042040

042060
042080

→060080

060100

→060120**

042040

042060
042080

→060080

060100

→060120**

042040

042060
042080

→060080

060100

→060120**

042040

042060
042080

→060080

060100

→060120**

TABLE 5—MAXIMUM ALLOWABLE PIPE LENGTH (FT)

TERMINATION

TYPE

2 Pipe or 2-In.

Concentric

2 Pipe or 2-In.

Concentric

2 Pipe or 2-In.

Concentric

2 Pipe or 2-In.

Concentric

2 Pipe or 3-In.

Concentric

2 Pipe or 2-In.

Concentric

2 Pipe or 2-In.

Concentric

2 Pipe or 2-In.

Concentric

2 Pipe or 2-In.

Concentric

2 Pipe or 3-In.

Concentric

2 Pipe or 2-In.

Concentric

2 Pipe or 2-In.

Concentric

2 Pipe or 2-In.

Concentric

2 Pipe or 2-In.

Concentric

2 Pipe or 3-In.

Concentric

2 Pipe or 2-In.

Concentric

2 Pipe or 2-In.

Concentric

2 Pipe or 2-In.

Concentric

2 Pipe or 2-In.

Concentric

2 Pipe or 3-In.

Concentric

2 Pipe or 2-In.

Concentric

2 Pipe or 2-In.

Concentric

2 Pipe or 2-In.

Concentric

2 Pipe or 2-In.

Concentric

2 Pipe or 3-In.

Concentric

PIPE

DIAMETER

(IN.)*

1-1/2 50 45 40 35 30 25

2 707070707070

1-1/2 50 45 40 35 30 25

2 707070707070

1-1/2 30 25 20 15 10 5

2 707070707070
2 454035302520

2-1/2 70 70 70 70 70 70

2-1/2 one disk 10 NA NA NA NA NA

3 one disk 35 30 15 NA NA NA

3† one disk 35 35 35 30 30 30

3† no disk 70 70 70 70 70 70

1-1/2 45 40 35 30 25 20

2 707070707070

1-1/2 45 40 35 30 25 20

2 707070707070

1-1/2 26 21 16 11 6 NA

2 707070707070
2 403530252015

2-1/2 70 70 70 70 70 70

3 one disk 31 26 12 NA NA NA

3† one disk 31 30 30 25 25 24

3† no disk 63 62 62 61 61 61

1-1/2 42 37 32 27 22 17

2 707070707070

1-1/2 42 37 32 27 22 17

2 707070707070

1-1/2 25 20 15 10 5 NA

2 707070707070
2 383328231813

2-1/2 70 70 70 70 70 70

3 one disk 29 24 10 NA NA NA

3† one disk 29 28 28 23 22 21

3† no disk 59 59 58 57 57 56

1-1/2 40 35 30 25 20 15

2 707070707070

1-1/2 40 35 30 25 20 15

2 707070707070

1-1/2 23 18 13 8 NA NA

2 707070707068
2 363126211611

2-1/2 70 70 70 70 70 70

3† one disk 27 26 26 21 20 19

3† no disk 56 55 54 53 52 52

1-1/2 37 32 27 22 17 12

2 707070707070

1-1/2 37 32 27 22 17 12

2 707070707070

1-1/2 22 17 12 7 NA NA

2 707070706863
2 3328231813 8

2-1/2 70 70 70 70 70 70

3† one disk 26 24 23 18 17 16

3† no disk 53 52 50 49 48 47

123456

NUMBER OF 90° ELBOWS

—23—

TABLE 5—MAXIMUM ALLOWABLE PIPE LENGTH (FT) Continued

ALTITUDE UNIT SIZE

042040

042060

6001 to 7000‡

7001 to 8000‡

8001 to 9000‡

9001 to 10000‡

* Disk usage—Unless otherwise stated, use perforated disk assembly (factory-supplied in loose parts bag).
† Wide radius elbow.
‡ Vent sizing for Canadian installations over 4500 ft (1370m) above sea level are subject to acceptance by the local authorities having jurisdiction.
** Tentative data.
NA—Not Allowed; pressure switch will not make.

NOTES:

1. Do not use pipe size greater than those specified in table or incomplete combustion, flame disturbance, or flame sense lockout may occur.

2. Size both the combustion-air and vent pipe independently, then use the larger diameter for both pipes.

3. Assume two 45° elbows equal one 90° elbow. Long radius elbows are desirable and may be required in some cases.

4. Elbows and pipe sections within the furnace casing and at the vent termination should not be included in vent length or elbow count.

5. The minimum pipe length is 5 ft for all applications.

d. Install pipe support (factory-supplied in loose parts bag)

042080

→060080

060100

→060120**

042040

042060
042080

→060080

060100

→060120**

042040

042060
042080

→060080

060100

→060120**

042040

042060
042080

→060080

060100

→060120**

TERMINATION

TYPE

2 Pipe or 2-In.

Concentric

2 Pipe or 2-In.

Concentric

2 Pipe or 2-In.

Concentric

2 Pipe or 2-In.

Concentric

2 Pipe or 3-In.

Concentric

2 Pipe or 2-In.

Concentric

2 Pipe or 2-In.

Concentric

2 Pipe or 2-In.

Concentric

2 Pipe or 2-In.

Concentric

2 Pipe or 3-In.

Concentric

2 Pipe or 2-In.

Concentric

2 Pipe or 2-In.

Concentric

2 Pipe or 2-In.

Concentric

2 Pipe or 2-In.

Concentric

2 Pipe or 3-In.

Concentric

2 Pipe or 2-In.

Concentric

2 Pipe or 2-In.

Concentric

2 Pipe or 2-In.

Concentric

2 Pipe or 2-In.

Concentric

2 Pipe or 3-In.

Concentric

into selected furnace casing combustion-air pipe hole.
Pipe support should be positioned to bottom of casing
hole.

e. Insert 2-in. diameter pipe into intake housing.

NOTE: A 2-in. diameter pipe must be used within the furnace
casing. Make all pipe diameter transitions outside furnace casing.

f. Drill a 1/8-in. hole in 2-in. combustion-air pipe using

hole in intake housing as a guide.

g. Install a field-supplied No. 6 or No. 8 sheet metal screw

into combustion-air pipe.

NOTE: DO NOT OVERTIGHTEN SCREW. Breakage to intake
housing or fitting may cause air leakage to occur.

PIPE

DIAMETER

(IN.)*

1-1/2 35 30 25 20 15 10

2 70706867 66 64

1-1/2 35 30 25 20 15 10

2 70706867 66 64

1-1/2 20 15 10 5 NA NA

2 70706867 62 57
2 31262116 11 6

2-1/2 70 70 68 67 66 64

3† one disk 24 22 21 16 15 13

3† no disk 49 48 47 45 44 43

1-1/2 32 27 22 17 12 7

2 66656362 60 59

1-1/2 32 27 22 17 12 7

2 66656362 60 59

1-1/2 18 13 8 NA NA NA

2 66656362 57 52
2 29241914 9 NA

2-1/2 66 65 63 62 60 59

3† one disk 22 20 19 14 12 11

3† no disk 46 44 43 41 40 38

1-1/2 30 25 20 15 10 5

2 62605856 55 53

1-1/2 30 25 20 15 10 5

2 62605856 55 53

1-1/2 17 12 7 NA NA NA

2 62605856 51 46
2 27221712 7 NA

2-1/2 62 60 58 56 55 53

3† one disk 20 18 17 12 10 8

3† no disk 43 41 39 37 35 34

1-1/2 27 22 17 12 7 NA

2 57555351 49 47

1-1/2 27 22 17 12 7 NA

2 57555351 49 47

1-1/2 15 10 5 NA NA NA

2 57555351 46 41
2 241914 9 NANA

2-1/2 57 55 53 51 49 47

3† one disk 18 16 14 9 7 5

3† no disk 39 37 35 33 31 29

1234 5 6

NOTE: Do not attach combustion-air intake pipe permanently to
combustion-air intake housing since it may be necessary to remove
pipe for service of ignitor or flame sensor.

COMBUSTION-AIR INTAKE HOUSING PLUG
FITTING

The combustion-air intake plug fitting must be installed in
unused combustion-air intake housing. This fitting must be
attached by using RTV sealant, or by drilling a 1/8-in. hole
in fitting, using hole in intake housing as a guide. Install a
field-supplied No. 6 or No. 8 sheet metal screw.

NOTE: DO NOT OVERTIGHTEN SCREW. Breakage to intake
housing or fitting may cause air leakage to occur.

NUMBER OF 90° ELBOWS

—24—

A plugged drain connection has been provided on this
fitting for use when moisture is found in combustion-air
intake pipe and combustion box.

NOTE: Moisture in combustion-air intake may be result of
improper termination. Ensure combustion-air intake pipe is similar
to that shown in Fig. 31, 32, 33, 34, or 35 so it will not be
susceptible to areas where light snow or other sources of moisture
could be pulled in.

If use of this drain connection is desired, drill out fitting’s
tap plug with a 3/16-in. drill and connect a field-supplied
3/8-in. tube. This tube should be routed to open condensate
drain for furnace and A/C (if used), and should be trapped.
(See Fig. 30.)

COMBUSTION – AIR

3/8" ID TUBE

3/16"

DRILL

4″

TRAP

TO OPEN

MIN

DRAIN

Fig. 30—Intake Housing Plug Fitting Drain

INTAKE HOUSING

BURNER
BOX

COMBUSTION –
AIR PIPE


A93035

2. Attach vent pipe as follows:
a. Determine location of vent pipe connection to inducer

housing as shown in Fig. 28 for application.

b. Reposition neoprene inducer housing outlet cap and

clamp to appropriate unused inducer housing connec­tion. Tighten clamp.

WARNING: Inducer housing outlet cap must be in­stalled and fully seated against inducer housing. Clamp
must be tightened to prevent any condensate leakage.
Failure to follow this warning could result in electrical
shock, fire, personal injury, or death.

c. Install pipe support (factory-supplied in loose parts bag)

into selected furnace casing vent pipe hole. Pipe support
should be positioned to bottom of casing hole.

d. Insert 2-in. diameter pipe into inducer housing through

neoprene coupling and clamp in inducer housing.
Tighten clamp.

WARNING: Vent pipe must be installed and fully
seated against inducer housing. Clamp must be tightened
to prevent any condensate leakage. Failure to follow this
warning could result in electrical shock, fire, personal
injury, or death.

NOTE: A 2-in. diameter pipe must be used within the furnace
casing. Make all pipe diameter transitions outside furnace casing.

3. Working from furnace to outside, cut pipe to required
length(s).

4. Deburr inside and outside of pipe.

5. Chamfer outside edge of pipe for better distribution of
primer and cement.

6. Clean and dry all surfaces to be joined.

7. Check dry fit of pipe and mark insertion depth on pipe.

NOTE: It is recommended that all pipes be cut, prepared, and
preassembled before permanently cementing any joint.

8. After pipes have been cut and preassembled, apply gener­ous layer of cement primer to pipe fitting socket and end of
pipe to insertion mark. Quickly apply approved cement to
end of pipe and fitting socket (over primer). Apply cement
in a light, uniform coat on inside of socket to prevent
buildup of excess cement. Apply second coat.

9. While cement is still wet, twist pipe into socket with 1/4
turn. Be sure pipe is fully inserted into fitting socket.

10. Wipe excess cement from joint. A continuous bead of
cement will be visible around perimeter of a properly made
joint.

11. Handle pipe joints carefully until cement sets.

12. Support combustion-air and vent piping a minimum of
every 5 ft (3 ft for SDR-21 or -26 PVC) using perforated
metal hanging strap.

13. Slope combustion-air and vent pipes toward furnace a
minimum of 1/4 in. per linear ft with no sags between
hangers.

14. Use appropriate methods to seal openings where vent and
combustion-air pipes pass through roof or side wall.

III. CONCENTRIC VENT AND COMBUSTION-AIR
TERMINATION KIT INSTALLATION

NOTE: If these instructions differ from those packaged with

termination kit, follow kit instructions.
Combustion-air and vent pipes must terminate outside structure. A

factory accessory termination kit must be installed in 1 of the
installations shown in Fig. 31, 32, 33, 34, or 35. Four termination
kits are available.

1. The 2-in. termination bracket kit is for 1-in., 1-1/2 in., and
2-in. diameter 2-pipe termination systems.

2. The 3-in. termination bracket kit is for 2-1/2 in. and 3-in.
diameter 2-pipe termination systems.

3. The 2-in. concentric vent/air termination kit is for 1-in.,
1-1/2 in., 2-in., and 2-1/2 in. diameter pipe systems when
single penetration of wall or roof is desired.

4. The 3-in. concentric vent/air termination kit is for 2-1/2 in.
and 3-in. diameter pipe systems when single penetration of
wall or roof is desired.

NOTE: Shaded parts in Fig. 31, 32, 33, 34, and 35 are considered
to be terminations. These components should NOT be counted
when determining pipe diameter. Roof termination is preferred
since it is less susceptible to damage, has reduced chances to intake
contaminants, and has less visible vent vapors. (See Fig. 31 or 32.)
Sidewall termination may require sealing or shielding of building
surfaces with a corrosive resistance material due to corrosive
combustion products of vent system.

A. Extended Exposed Sidewall Pipes

Sidewall combustion-air and vent pipe terminations may be
extended beyond area shown in Fig. 34 or 35 in outside ambient by
insulating pipes as indicated in Table 6.

1. Determine combustion-air and vent pipe diameters, as
stated above, using total pipe length and number of elbows.

2. Using winter design temperature (used in load calculations),
find appropriate temperature for your application and fur­nace model.

3. Determine required insulation thickness for exposed pipe
lengths.

—25—

MAINTAIN 12 IN.
CLEARANCE
ABOVE HIGHEST
ANTICIPATED SNOW
LEVEL OR GRADE,
WHICHEVER IS
GREATER.

90°

VENT

12 IN. SEPARATION
BETWEEN BOTTOM OF
COMBUSTION AIR AND
BOTTOM OF VENT

BRACKET

COUPLING

12″ MINIMUM

OVERHANG OR ROOF

COMBUSTION-AIR
(ELBOW PARALLEL
TO WALL)

VERTICAL SEPARATION

BETWEEN COMBUSTION

MAXIMUM OF 24 IN. ABOVE ROOF.

AIR AND VENT
8 3/4″ FOR 3″ KIT
6 3/4″ FOR 2″ KIT

MAINTAIN 12 IN. MINIMUM

CLEARANCE ABOVE HIGHEST

ANTICIPATED SNOW LEVEL.

COUPLING

VENT

ROOF

18″ MAXIMUM

BRACKET

COMBUSTION
AIR

Fig. 31—Roof Termination (Preferred)

VENT

COMBUSTION
AIR

MAINTAIN 12 IN.
(18 IN. FOR CANADA)
MINIMUM CLEARANCE
ABOVE HIGHEST
ANTICIPATED SNOW
LEVEL. MAXIMUM OF
24 IN. ABOVE ROOF.

Fig. 32—Concentric Vent and Combustion-Air Roof

Termination (Preferred)

OVERHANG OR ROOF

A93054

A87224

OVERHANG OR ROOF

12″ MINIMUM

1″ MAXIMUM

COMBUSTION-AIR

VENT

MAINTAIN 12 IN.
CLEARANCE
ABOVE HIGHEST
ANTICIPATED SNOW
LEVEL OR GRADE,
WHICHEVER IS
GREATER.

Fig. 33—Concentric Vent and Combustion-Air Side

Termination

A93055

BRACKET

90°

Fig. 34—Sidewall Termination of 12 in. or More

12″ MINIMUM

VENT

COMBUSTION-AIR

12 IN. SEPARATION
BETWEEN BOTTOM OF
COMBUSTION AIR AND
BOTTOM OF VENT

MAINTAIN 12 IN.
CLEARANCE
ABOVE HIGHEST
ANTICIPATED SNOW
LEVEL OR GRADE,
WHICHEVER IS
GREATER.

A87225

A87226

Fig. 35—Sidewall Termination of Less than 12 in.

—26—

TABLE 6—MAXIMUM ALLOWABLE EXPOSED VENT PIPE LENGTH (FT) WITH INSULATION IN WINTER DESIGN

TEMPERATURE AMBIENT*

UNIT

SIZE

042040

042060

042080

→060080

060100

→060120

* Pipe length (ft) specified for maximum pipe lengths located in unconditioned spaces. Pipes located in unconditioned space cannot exceed total allowable pipe length as
specified in Table 5.
† Insulation thickness based on R value of 3.5 per in.

NOTE: Pipe length (ft) specified for maximum pipe lengths
located in unconditioned spaces cannot exceed total allowable pipe
length as specified in Table 5.

B. Two-Pipe Termination Kit

WINTER

DESIGN TEMPERA-

TURE (°F)

20 2 2137425057

0 2 10 22 25 30 35

-20 2 5 14 17 21 25
20 2 3055617070

0 2 16 33 38 46 53

-20 2 9 23 26 33 38
20 2 3765707070

0 2 20 39 45 55 63

-20 2 1127313945
20 2-1/2 41 70 70 70 70

0 2-1/2 21 42 48 59 68

-20 2-1/2 11 28 33 41 49
20 3 4970707070

0 3 26 51 58 70 70

-20 3 1535405059

MAXIMUM PIPE

DIAMETER

0 3/8 1/2 3/4 1

5. Check required dimensions as shown in Fig. 31, 34, or 35.

C. Concentric Vent/Air Termination Kit

1. Determine location for termination.

1. Determine location for termination.
Consideration of the following should be made when

determining an appropriate location for termination kit.
a. Comply with all clearance requirements as stated in

Table 4.

b. Termination kit should be positioned where vent vapors

will not damage plants/shrubs or air conditioning equip­ment.

c. Termination kit should be positioned so it will not be

affected by wind eddy (such as inside building corners)
or accumulation of airborne leaves or light snow, or
allow recirculation of flue gases.

d. Termination kit should be positioned where it will not be

damaged by or subjected to foreign objects, such as
stones, balls, etc.

e. Termination kit should be positioned where vent vapors

2. Cut one 4-in. diameter hole for 2-in. kit, or one 5-in.

are not objectionable.

2. Cut 2 holes, 1 for each pipe, of appropriate size for pipe size

3. Loosely assemble concentric vent/air termination compo-

being used.

3. Loosely install elbow in bracket and place assembly on

4. Slide assembled kit with rain shield REMOVED through

combustion-air pipe.
Roof terminations—Loosely install pipe coupling on prop-

erly cut vent pipe. Coupling must be positioned so bracket

NOTE: Do not allow insulation or other materials to accumulate
inside of pipe assembly when installing it through hole.

will mount as shown in Fig. 31.
For applications using combustion-air pipe option, indi-

cated by dashed lines in Fig. 31, install 90° street elbow into
90° elbow, making U-fitting. A 180° U-fitting may be used.

Sidewall terminations—Install bracket as shown in Fig. 34

5. Disassemble loose pipe fittings. Clean and cement using

or 35.
For applications using vent pipe option indicated by dashed

lines in Fig. 34, rotate vent elbow 90° from position shown
in Fig. 34.

4. Disassemble loose pipe fittings. Clean and cement using
same procedures as used for system piping.

6. Check required dimensions as shown in Fig. 32 or 33.

IV. MULTIVENTING AND VENT TERMINATIONS

When 2 or more 355MAV Furnaces are vented near each other,
each furnace must be individually vented. NEVER common vent
or breach vent 355MAV furnaces. When 2 or more 355MAV

INSULATION THICKNESS (IN.)†

Consideration of the following should be made when
determining an appropriate location for termination kit.

a. Comply with all clearance requirements as stated in

Table 4.

b. Termination kit should be positioned where vent vapors

will not damage plants/shrubs or air conditioning equip­ment.

c. Termination kit should be positioned so it will not be

affected by wind eddy (such as inside building corners)
or accumulation of airborne leaves or light snow, or
allow recirculation of flue gases.

d. Termination kit should be positioned where it will not be

damaged by or subjected to foreign objects, such as
stones, balls, etc.

e. Termination kit should be positioned where vent vapors

are not objectionable.

diameter hole for 3-in. kit.

nents together using instructions in kit.

hole.

Roof terminations—Locate assembly through roof to ap­propriate height as shown in Fig. 32.

Sidewall terminations—Locate assembly through sidewall
with rain shield positioned no more than 1-in. from wall as
shown in Fig. 33.

same procedures as used for system piping.

—27—

A

A85182

Fig. 36—Rooftop Termination (Dimension "A" is Touching or 2-In. Maximum Separation)

VENT

VENT

A

COMBUSTION
AIR

A93056

Fig. 37—Concentric Vent and Combustion-Air Roof

Termination (Dimension "A" is Touching or 2-In. Maximum

Separation)

VENT

1″ MAXIMUM
(TYP)

COMBUSTION AIR

VENT

A

VENT

A93057

Fig. 38—Concentric Vent and Combustion-Air Side

Termination (Dimension "A" is Touching or

2-In. Maximum Separation)

VENT

COMBUSTION AIR

COMBUSTION AIR

A

Fig. 39—Sidewall Termination of 12 in. or Less

(Dimension "A" is Touching or 2-In.

Maximum Separation)

A85184

—28—

COMBUSTION AIR

A

COMBUSTION AIR

Fig. 40—Sidewall Termination of More Than 12 in.

(Dimension "A" is Touching or 2-In.

Maximum Separation)

A85183

furnaces are vented near each other, 2 vent terminations may be
installed as shown in Fig. 36, 37, 38, 39, or 40, but next vent
termination must be at least 36 in. away from first 2 terminations.
It is important that vent terminations be made as shown to avoid
recirculation of flue gases. Dimension "A" in Fig. 36, 37, 38, 39,
and 40 represents distance between pipes or rain shields, as
touching or 2-in. maximum separation.

CONDENSATE DRAIN

I. GENERAL

Condensate trap is shipped installed in the blower shelf and factory
connected for UPFLOW applications. Condensate trap must be
RELOCATED for use in DOWNFLOW and HORIZONTAL
applications.

Condensate trap MUST be used for all applications.
An external trap is not required when connecting the field drain to

this condensate trap.
The field drain connection (condensate trap or drain tube coupling)

is sized for 1/2-in. CPVC, 1/2-in. PVC, or 5/8-in. ID tube
connection.

Drain pipe and fittings must conform to ANSI standards and
ASTM D1785 or D2846. CPVC or PVC cement and primer must
conform to ASTM D2564 or F493. In Canada, use CSA or ULC
certified schedule 40 CPVC or PVC drain pipe, fittings, and
cement.

When a condensate pump is required, select a pump which is
approved for condensing furnace applications. To avoid conden­sate spillage, select a pump with an overflow switch.

II. APPLICATION

Outdoor draining of the furnace is permissible if allowed by local
codes. Caution should be taken when freezing ambient may freeze
drain pipe and prohibit draining.

WARNING: Caution should be taken to prevent drain­ing where slippery conditions may cause personal inju­ries. Excessive condensate draining may cause saturated
soil conditions which may result in damage to plants.

III. CONDENSATE DRAIN PROTECTION

Freezing condensate left in condensate trap and drain line may
cause cracks, and possible water damage may occur. If freeze
protection is required, use condensate freeze protection accessory
or equivalent 3 to 6 watt per ft at 120v and 40°F self-regulating,
shielded, and waterproof heat tape. See Installation Instructions
supplied with accessory or heat tape manufacturer’s recommenda­tions.

OPEN STAND

PIPE FOR

A/C OR

HUMIDIFIER

DRAIN

TEE

TO OPEN
DRAIN

A94054

Fig. 41—Example of Field Drain Attachment

The furnace, A/C, and humidifier drains may be combined and
drained together. The A/C drain must have an external, field­supplied trap prior to the furnace drain connection. All drain
connections (furnace, A/C, or humidifier) must be terminated into
an open or vented drain as close to the respective equipment as
possible to prevent siphoning of the equipment’s drain.

See Fig. 41 for example of possible field drain attachment using
1/2-in. CPVC or PVC tee for vent and A/C or humidifier drain
connection.

32°F MINIMUM INSTALLED
AMBIENT OR FREEZE
PROTECTION REQUIRED

A93058

CAUTION: Unit must not be installed, operated, and
then turned and left off in an unoccupied structure during
cold weather when temperature drops to 32°F or below
unless drain trap and drain line have adequate freeze
protection. See Service and Maintenance Instructions for
winterizing procedure.

1. Fold heat tape in half and wrap on itself 3 times.

2. Locate heat tape between sides of condensate trap back.
(See Fig. 42.)

3. Use wire ties to secure heat tape in place. Wire ties can be
positioned in notches of condensate trap sides. (See Fig.

42.)

4. Wrap field drain pipe with remaining heat tape, approxi­mately 1 wrap per ft.

5. When using field-supplied heat tape, follow heat tape
manufacturer’s instructions for all other installation guide­lines.

—29—

CONDENSATE TRAP

WIRE TIE(S)

(3 WRAPS MINIMUM)

Using schematic diagram (see Fig. 23), follow sequence of
operation through different modes. This furnace has a new control
system. Read and follow wiring diagram carefully.

→

NOTE: If 115-v power supply to furnace or blower access panel
switch is interrupted during a call for heat, blower operates at
low-heat speed for 60 sec when power is restored before heating
cycle is resumed.

I. SELF-TEST MODE

The control center goes through a brief self test whenever 115-v or
24-v power is interrupted. The self test takes approximately 2 sec
to complete. After power is restored, red (microprocessor) LED
briefly comes on. Then green LED comes on for 1 sec, followed by
1 sec where both yellow and green LEDs are on. During this time,
the microprocessor is checking itself.

II. HEATING MODE

When thermostat calls for heat, R-W/W1 circuit closes.

→

→

NOTE: The heat cycle can start in either high or low heat. If a
high-heat cycle is initiated, the inducer continues increasing its
speed after low-pressure switch closes. When high-pressure switch
closes, inducer motor RPM is noted by microprocessor before the
25 sec prepurge period begins. The RPM is used to evaluate vent
system resistance. This evaluation is then used to determine
required RPM necessary to operate inducer in high-heat mode.

HEAT TAPE

Fig. 42—Condensate Trap Heat Tape

SEQUENCE OF OPERATION

CAUTION: Furnace control must be grounded for

proper operation, or control will lock out. Control is
grounded through green wire routed to gas valve and
burner box screw.

1. Prepurge period—The inducer motor is turned on and

slowly comes up to speed. When low-pressure switch
closes, inducer motor RPM is noted by microprocessor, and
a 25 sec prepurge period begins. The RPM is used to
evaluate vent system resistance. This evaluation is then
used to determine required RPM necessary to operate
inducer in low-heat mode.

2. Humidifier (HUM)—The HUM terminal is energized

whenever the inducer prepurge period is completed.

3. Ignitor warm up—At end of prepurge period, the hot

surface ignitor (HSI) is energized for a 17-sec HSI warm-up
period.

4. Ignition sequence—After HSI ignitor warm-up period is

completed, the gas valve opens, permitting gas flow to
burners where it is ignited. After 5 sec, the HSI is
de-energized and a 2-sec flame-sensing period begins.

A93036

NOTE: The initial heat mode after 115-v or 24-v power interrup­tion will be LOW HEAT. Low heat remains energized for 16
minutes before high heat is initiated, providing thermostat is still
calling for heat.

After the initial cycle, the microprocessor evaluates the length of
low- and high-heat operating times and calculates optimum length
of low and high heat for next heat cycle. This accommodates the
heat load requirement seen as a result of thermostat operating time.

5. Flame sensing—When burner flame is sensed, the control

center holds gas valve open and begins blower on delay
period.

NOTE: Ignition sequence repeats 3 additional times before a
lockout occurs. Lockout automatically resets after 3 hr, or can be
manually reset by turning 115-v or 24-v power off (not at
thermostat) for 3 sec minimum, then turning on again.

→

6. Inducer speed reduction—If cycle starts in low heat,

inducer speed reduces slightly after the flame sense. If cycle
starts in high heat, inducer speed increases 15 sec after
flame sense. The reduction in speed in low heat is to
optimize combustion for maximum efficiency.

7. Blower on delay—The blower starts 60 sec after flame

sense if cycle started in low heat or 35 sec after flame sense
if cycle started in high heat.

NOTE: The blower starts at approximately 400-500 RPM. After
20 sec, the motor is turned off for 1/10 of a sec where a coast down
calibration is done to evaluate resistance of the conditioned air
duct system. The microprocessor then determines blower RPM
required to provide proper airflow for heating mode.

8. Electronic Air Cleaner—The EAC-1 terminal is energized

whenever the blower operates.

9. Blower off delay—When thermostat is satisfied, the

R-W/W1 signal is terminated, de-energizing gas valve
(stopping gas flow to burners) and HUM terminal is
de-energized.

The blower reduces its speed to low-heat RPM. The blower
and EAC remain operating 90, 135, 180, or 225 sec
(depending on blower off time selection). The furnace is
factory set for a 90 sec blower off delay.

10. Post purge—The inducer continues operating for 15 sec

after gas valve is de-energized.

III. HEATING MODE—TWO STAGE

The control center provides 2-stage heating using a single-stage
thermostat. The control center maximizes comfort while optimiz­ing efficiency to meet the demands of the conditioned area when
a thermostat R-W/W1 signal is received.

If thermostat control over furnace staging is desired, a 2-stage
thermostat can be used. When control center receives a thermostat
R-W/W1 and R-W2 signal, high heat is energized and when
R-W/W1 signal is received, low heat is energized. This method
overrides microprocessor control of high or low heat.

NOTE: When using 2-stage thermostat operation with R-W/W1
and R-W2 signals, setup switch SW-2 MUST be in ON position.

The heat cycle operates as stated in Heating Mode section.
To allow for greater comfort, a 2-stage thermostat control is

recommended when zone systems are used.

IV. EMERGENCY HEAT MODE
NOTE: The furnace should not be operated in emergency heat

mode for extended periods of time. Operation is only recom­mended to provide heat until replacement components can be
obtained or fault resolved.

In this mode, the microprocessor is bypassed and the motors
operate at full speed with high-heat operation. The heat exchang­ers, motors, and electronics can be overstressed and may reduce
the life of the components if operated for an extended period.

—30—

NOTE: No safeties are bypassed when using emergency heat
mode.

Emergency heat mode can be selected using setup switch SW-4.
SW-4 should be used when a fault condition exists or difficult to
resolve problems occur. This allows heating until the fault can be
corrected.

In emergency heat mode, the normal heat mode outlined in
Heating Mode section is not followed. The following sequence
will occur:

When thermostat calls for heat, the R-W/W-1 circuits close.

1. Prepurge period—The inducer motor is turned on IMME-

DIATELY operating at maximum speed, closing low- and
high-pressure switches. Prepurge begins 25 sec after high­pressure switch closes.

2. Blower on—The blower motor is turned on IMMEDI-

ATELY and slowly increases to maximum speed as soon as
a call for heat is received. No blower calibration occurs.

3. Electronic Air Cleaner—The EAC-1 terminal does not

operate in emergency heat mode.

→

4. Humidifier—The HUM terminal is energized IMMEDI-

ATELY.

5. Ignitor warm up—The HSI is energized for a 17 sec

warm-up period after prepurge period is completed.

6. Ignition sequence—After HSI warm-up period has com-

pleted, the gas valve is energized, permitting gas flow to
burners where it is ignited. After 5 sec, the HSI is
de-energized and a 2-sec flame-sensing period begins.

NOTE: Emergency heat mode only operates in high heat.

7. Flame sensing—When burner flame is sensed, control

center holds gas valve open. If burner flame is not sensed,
control center de-energizes gas valve and ignition sequence
is repeated.

→

NOTE: Ignition sequence repeats 3 additional times before lock­out occurs. Lockout automatically resets after 3 hr, or can be
manually reset by turning 115-v or 24-v power off (not at
thermostat) for 3 sec minimum, then turning on again. Fault codes
will not flash in emergency heat mode.

8. Blower off delay—When thermostat is satisfied, the

R-W/W1 signal is terminated, de-energizing gas valve
(stopping gas flow to burners) and HUM terminal is
de-energized. In addition, blower stops immediately.

9. Post purge—Post purge does NOT occur. The inducer

stops immediately.

V. COOLING MODE

When thermostat calls for cooling, the R-G and R-Y/Y2 circuits
close.

1. Cooling unit—The cooling unit starts when thermostat

R-Y signal is received.

2. Blower on—The control center starts blower immediately

when it receives an R-Y/Y2 and R-G signal. The blower
starts at approximately 400-500 RPM. After 20 sec, the
blower is turned off for 1/10 of a sec where a coast down
calibration is done to evaluate resistance of the conditioned
air duct system. The microprocessor then determines
blower RPM required to provide selected cooling airflow.

NOTE: In cooling mode, the microprocessor adjusts blower RPM
to operate at 400 CFM per ton as selected on the A/C setup
switches. See Air Conditioning Setup Switches section. There is
also a chart on wiring diagram. (See Fig. 23.)

NOTE: If Y/Y2 thermostat lead is not connected to furnace
control center, blower motor operates in continuous fan speed and
indoor coil freeze-up may occur.

3. Electronic Air Cleaner—The EAC-1 terminal is energized
whenever blower operates.

4. Cooling unit—The cooling unit stops when thermostat R-Y
signal is terminated.

5. Blower off delay—When thermostat is satisfied, the
R-Y/Y2 and R-G signals are terminated, and blower re­mains operating for 90 sec.

→

VI. HEAT PUMP MODE

When furnace is operating in heat pump heating mode, R-Y/Y2
and R-G circuits are closed energizing heat pump, and blower
operates at cooling speed. When heat pump defrost is required,
R-W/W1 circuits close starting gas heat cycle, and blower adjusts
to low-heat speed.

1. Prepurge period—The inducer motor is turned on and
slowly comes up to speed. When low-pressure switch
closes, inducer motor RPM is noted by microprocessor, and
a 25 sec prepurge period begins. The RPM is used to
evaluate vent system resistance. This evaluation is then
used to determine required RPM necessary to operate
inducer in low-heat mode.

NOTE: The heat cycle can start in either high or low heat. If a
high-heat cycle is initiated, inducer continues increasing its speed
after low-pressure switch closes. When high-pressure switch
closes, inducer motor RPM is noted by microprocessor before the
25 sec prepurge period begins. The RPM is used to evaluate vent
system resistance. This evaluation is used to determine required
RPM necessary to operate inducer in high-heat mode.

2. Humidifier—The HUM terminal is energized whenever
inducer prepurge period is completed.

3. Ignitor warm up—After prepurge period, HSI is energized
for 17 sec.

4. Ignition sequence—After HSI warm-up period is com­pleted, the gas valve is energized, permitting gas flow to the
burners where it is ignited. After 5 sec, the HSI is
de-energized and a 2-sec flame-sensing period begins.

5. Flame sensing—When burner flame is sensed, control
center holds gas valve open.

If burner flame is not sensed, control center de-energizes
gas valve and ignition sequence is repeated.

6. Blower off period—Ten sec after gas valve is energized,
the blower stops for 25 sec to allow heat exchangers to
warm up.

7. Blower on delay—After blower off period, blower starts.

NOTE: The blower starts at approximately 400-500 RPM. After
20 sec, the motor is turned off for 1/10 of a sec where a coast down
calibration is done to evaluate resistance of the conditioned air
duct system. The microprocessor then determines blower RPM
required to provide proper airflow for heating mode.

8. Electronic Air Cleaner—The EAC-1 terminal is energized
whenever blower operates.

9. Inducer speed reduction—If cycle starts in low heat,
inducer speed reduces slightly after the flame sense. If cycle
starts in high heat, inducer speed increases 15 sec after
flame sense. The reduction in speed in low heat is to
optimize combustion for maximum efficiency.

10. Call for heat terminated—When the call for heat is

satisfied, the R-W/W1 signal is terminated, de-energizing
gas valve (stopping gas flow to burners) and HUM terminal
is de-energized.

a. R-W/W1 signal terminated with R-Y/Y2 and R-G

still present—The blower changes its speed to cooling
RPM.

—31—

b. R-W/W1 with R-Y/Y2 and R-G signals terminated—

The blower continues to operate completing a normal
blower off delay.

11. Post purge—The inducer continues operating for 15 sec

after gas valve is de-energized.

VII. CONTINUOUS FAN MODE

1. Operating with continuous fan only.
a. Call for continuous fan—The thermostat closes R-G

circuit.

b. Blower on—The blower starts immediately.

NOTE: The blower starts at approximately 400-500 RPM. After
20 sec, the motor is turned off for 1/10 of a sec where a coast down
calibration is done to evaluate resistance of the conditioned air
duct system. The microprocessor then determines blower RPM
required to provide proper airflow for heating mode.

NOTE: The continuous fan speed is the same as low-heat speed
unless it is field adjusted to another desired airflow. See Continu­ous Fan Setup Switches section. There is also a chart on wiring
diagram. (See Fig. 23.)

c. Electronic Air Cleaner—The EAC-1 terminal is ener-

gized whenever blower operates, regardless of operating
mode.

→

2. Operating with continuous fan (R-G) and call for heat
(R-W/W1) is received—Same as heat pump mode except

blower on delay is 10 sec less than the heat mode. After call
for heat (R-W/W1) is terminated, the blower remains
operating at low-heat speed for selected blower off delay
before resuming continuous fan speed.

3. Operating with continuous fan (R-G) and call for cool-
ing (R-Y/Y2) is received—See Cooling Mode section.
After call for cooling (R-Y/Y2) is terminated, the blower
remains operating at cooling speed for 90 sec before
resuming continuous fan speed.

VIII. COMPONENT TEST

All components are functionally operated except gas valve with
component test feature.

This feature helps diagnose a system problem in case of a
component failure.

NOTE: Setup switch SW-1 MUST be in OFF position or Fault
Code 22 (setup error) will occur.

NOTE: NO thermostat signal may be present at control center,
and all blower time delay off periods must be completed.

To initiate component test feature, proceed with the following:

1. Leave 115-v power to furnace turned on.

2. Remove main furnace door.

3. Remove blower access panel.

4. Turn setup switch SW-6 to ON position.

5. Manually close blower access panel door switch.

→

→

WARNING: Blower access panel door switch opens
115-v power to control center. No component operation
can occur. Caution must be taken when manually closing
this switch for service purposes. Failure to follow this
warning could result in personal injury or death.

When items 1-5 have been completed, the following will occur:

1. The control center goes through a brief self test. This self
test takes approximately 2 sec to complete. After door
switch is closed, red (microprocessor) LED briefly comes
on. Then green LED comes on for 1 sec, followed by 1 sec
where both green and yellow LEDs are on. During this time,
the microprocessor is checking itself.

2. Inducer motor operates for 20 sec at low speed, operates 20
sec at high speed, then turns off.

3. Hot surface ignitor is energized for 15 sec, then de­energized.

4. Main blower motor operates for 20 sec at low speed,
operates for 20 sec at high speed, then turns off.

5. After component operation test is completed, 1 or more
fault codes (11, 22, 41, or 42) will flash. See service label
on back of main furnace door for explanation of fault codes.

NOTE: To repeat component test, turn setup switch SW-6 to OFF
and then back to ON.

After component test, perform the following:

1. Release blower panel access door switch and turn setup
switch SW-6 to OFF position.

2. If applicable, replace blower access panel and check LED
status by removing plug in blower access panel.

3. Reinstall main furnace door if all LEDs are off, indicating
furnace is ready to operate when a signal from thermostat is
received.

→

IX. BYPASS HUMIDIFIER MODE

When setup switch SW-3 BPH is in ON position, RPM calculated
for low heat is multiplied by 1.15 for all furnace model sizes. This
compensates for increased return-air temperature caused by by­passed air supply.

→

X. DEHUMIDIFICATION MODE

If dehumidification input is energized with a 24-vac input, RPM
calculated for cooling and continuous fan is multiplied by 0.85 for
all furnace model sizes. This compensates for high humidity
conditions during cooling operation.

→

XI. ZONE MODE

When setup switch SW-5 MZ is in ON position, blower motor
control is the same as above except with the following exceptions:

1. While blower is operating in either low heat or continuous
fan, the coast down calibration is performed once a minute
to update blower RPM for zone damper position changes
during a given cycle unless the blower pulse width to
blower motor is greater than 60 percent. This prevents
nuisance faults from occurring when a high continuous fan
CFM has been selected.

2. While blower is operating in either high heat or cooling,
blower pulse width to blower motor is frozen when blower
RPM is within 10 percent of calculated blower RPM for 5
sec.

START-UP PROCEDURES

I. GENERAL

1. Furnace must have a 115-v power supply properly con­nected and grounded.

NOTE: Proper polarity must be maintained for 115-v wiring. If
polarity is incorrect, control center fault indicator light flashes
rapidly and furnace does not operate.

2. Thermostat wire connections at terminals R, W/W1, G, and
Y/Y2 must be made at 24-v terminal block on control
center.

3. Natural gas service pressure must not exceed 0.5 psig
(14-in. wc), but must be no less than 0.16 psig (4.5-in. wc).

4. Blower access panel must be in place to complete 24-v
electrical circuit to furnace.

—32—

TABLE 7—AIR CONDITIONING (A/C) AIRFLOW SETUP SWITCH POSITION

AIR CONDITIONER

(TONS)

Default

1-1/2 600 ON OFF OFF X X X — — —

2 800OFFONOFFXXXXXX

2-1/2 1000 ON ON OFF XXXXXX

3 1200 OFF OFF ON XXXXXX

3-1/2 1400 ON OFF ON XXXXXX

4 1600 OFF ON ON — — — X X X
5 2000 ON ON ON — — — X X X

X—Indicates allowable selection.

CFM AIRFLOW

1200 or

2000

A/C SETUP

SWITCH POSITION

A/C-1 A/C-2 A/C-3 042040 042060 042080 →060080 060100 →060120

OFF OFF OFF

CAUTION: These furnaces are equipped with a manual
reset limit switch in burner box. This switch opens if an
overheat condition (rollout) occurs in burner enclosure.
Correct inadequate combustion-air supply or improper
venting condition and reset switch. DO NOT jumper this
switch.

Before operating furnace, check each manual reset switch for
continuity. If necessary, press button to reset switch.

II. SELECT SETUP SWITCH POSITIONS
A. Air Conditioning (A/C) Setup Switches

The air conditioning setup switches are used to match furnace
airflow to the cooling unit used. This furnace will provide 400
CFM per selected air conditioning tonnage.

To set the desired cooling airflow:

1. Remove main furnace door and blower access panel.

2. Locate the A/C setup switches on the control center. (See
Fig. 25.)

3. Determine the air conditioning tonnage used.

4. Use Table 7 or wiring schematic to determine the proper
setup position of A/C switches. (See Fig. 23 and 43.)

1

3 Tons

1200 CFM

ALLOWABLE FURNACE MODEL SETUP

3 Tons

1200 CFM

3 Tons

1200 CFM

5 Tons

2000 CFM

5 Tons

2000 CFM

5 Tons

2000 CFM

1. Remove main furnace door and blower access panel.

2. Locate the CF setup switches on the control center. (See
Fig. 25.)

3. Determine the desired continuous fan airflow.

4. Use Table 8 or wiring schematic to determine the proper
setup position of CF switches. (See Fig. 23 and 43.)

NOTE: The CF switches are factory set to provide the continuous
fan airflow equal to the low-heat mode.

5. Replace main furnace door and blower access panel.

C. Setup Switches (SW)

The control center has 8 setup switches that may be set to meet the
application requirements. Position these setup switches for the
appropriate requirement.

1. Remove main furnace door and blower access panel.

2. Locate setup switches on the control center. (See Fig. 25.)

3. See Table 9 for setup switch description. (See Fig. 23 and

43.)

4. Replace main furnace door and blower access panel.

NOTE: If a bypass humidifier is used, setup switch SW-3 (BPH)
should be in ON position. This prevents nuisance limit trips caused
by the increased temperature in the return air resulting from the
bypass.

NOTE: If modulating dampers are used, setup switch SW-5 (MZ)
should be in ON position. This allows the furnace control center to
compensate for the modulating dampers. The control will re­calibrate for the new system static conditions once every minute
while operating in the low-heat or continuous fan modes.

III. PRIME CONDENSATE TRAP WITH WATER

OFF

Fig. 43—Example of Setup Switch in OFF Position

NOTE: Excessive airflow caused by improper A/C switch setup

may cause condensate blow off in the cooling mode.

5. Replace main furnace door and blower access panel.

NOTE: EAC-1 terminal is energized whenever the blower oper­ates. HUM terminal is only energized when the gas valve is
energized.

B. Continuous Fan (CF) Setup Switches

The CF setup switches are used to select desired airflow when the
thermostat is in the continuous fan mode. This setup feature will
allow the continuous fan airflow to be adjusted. To set the desired
continuous fan airflow:

A95198

CAUTION: Condensate trap must be PRIMED or
proper draining may not occur. The condensate trap has 2
internal chambers which can ONLY be primed by pour­ing water into the inducer drain side of condensate trap.

1. Remove upper inducer housing drain connection cap. (See
Fig. 44.)

2. Connect field-supplied 1/2-in. ID tube to upper inducer
housing drain connection.

3. Insert field-supplied funnel into tube.

4. Pour 1 quart of water into funnel/tube. Water should run
through inducer housing, overfill condensate trap, and flow
into open field drain. (See Fig. 45.)

5. Remove funnel and tube from inducer housing and replace
drain connection cap and clamp.

IV. PURGE GAS LINES

If not previously done, purge the lines after all connections have
been made and check for leaks.

—33—

TABLE 8—CONTINUOUS FAN (CF) AIRFLOW SETUP SWITCH POSITION

CONTINUOUS

FAN (CFM)

Default OFF OFF OFF 565* 515* 690* 690* 860* 1035*

600 ON OFF OFF X X X — — —

800 OFFONOFFXXXXXX
1000 ONONOFFXXXXXX
1200 OFFOFFONXXXXXX
1400 ONOFFONXXXXXX
1600 OFF ON ON — — — X X X
2000 ON ON ON — — — X X X

* Add 15% additional CFM when Bypass Humidifier switch SW-3 on control board is used. X—Indicates allowable selection.

CF-1 CF-2 CF-3 042040 042060 042080 →060080 060100 →060120

CF SETUP

SWITCH POSITION

ALLOWABLE FURNACE MODEL SETUP

Fig. 44—Inducer Housing Drain Tube

WARNING: Never purge a gas line into a combustion

chamber. Never use matches, candles, flame, or other
sources of ignition for the purpose of checking leakage.
Use a soap-and-water solution to check for leakage.
Failure to follow this warning could result in fire,
explosion, personal injury, or death.

V. ADJUSTMENTS
A. Set Gas Input Rate

There are 2 methods of adjusting gas input rate. The preferred
method is by using Table 11 and following instructions in item 1.
The second method is by clocking the gas meter as outlined in item

2. Item 2 must be used for altitudes above 2000 ft.

1. Determine natural gas orifice size and manifold pressure for
correct input by using Table 11.

A94208

A94209

Fig. 45—Filling Condensate Trap

a. Obtain average yearly heat value for local gas supply.
b. Obtain average yearly specific gravity for local gas

supply.

c. Verify the furnace model. Table 11 can only be used for

model 355MAV Furnaces.

d. Find natural gas heat value and specific gravity in Table

11.

e. Follow heat value line and specific gravity line to point

of intersection to find orifice size and manifold pressure
settings for proper operation at given natural gas condi­tion.

—34—

TABLE 9—SETUP SWITCH DESCRIPTION

SETUP

SWITCH NO.

SW-1
(FLT)

SW-2

(LOW)

SW-3

(BPH)

SW-4

(EMER HEAT)

SW-5

(MZ)

SW-6

(COMP TEST)

SW-7 and -8

(Blower

Off Delay)

NORMAL

POSITION

OFF

OFF

OFF

OFF

OFF

OFF

See

Table

10

DESCRIPTION OF USE

Turn switch to ON for fault history dis­play. No thermostat signal can be present
for fault history display.
Turn switch to ON to lock furnace in low­heat mode only.
Turn switch to ON when a bypass hu­midifier is used. This will compensate for
higher return-air temperature and provide
5 percent more airflow in low-heat mode
only.
Turn switch to ON to bypass micropro­cessor control. Furnace will operate at
high heat only with main blower and in­ducer motor operating at maximum RPM.
NO safeties are bypassed.
Turn switch to ON when modulating
dampers are used. In this mode, main
blower speed is recalculated once every
minute while furnace is in low-heat or
continuous fan mode.
Turn switch to ON to initiate component
test. Furnace will operate inducer motor
20 sec low speed, 20 sec high speed,
HSI 15 sec or IID 0 sec, blower 20 sec
low speed, and blower 20 sec high
speed. SW-1 must be in OFF position.
No thermostat signal can be present for
component test to be initiated.
Adjust switches to provide desired heat­ing mode blower off delay time, 90, 135,
180, or 225 sec.

TABLE 10—BLOWER OFF DELAY SETUP SWITCH

POSITION

DESIRED HEATING

MODE BLOWER

OFF DELAY (SEC)

90 OFF OFF
135 ON OFF
180 OFF ON
225 ON ON

SETUP SWITCH (SW-7 AND -8) POSITION

SW-7 SW-8

EXAMPLE:
Heat value = 1010 Btu/cu ft
Specific gravity = 0.62
Therefore: Orifice No. 44* with manifold pressure 3.3-in.
wc for high heat and 1.4-in. wc for low heat.
* Furnace is shipped with No. 45 orifices. In this example
all main burner orifices must be changed and the manifold
pressure adjusted.

f. Check and verify orifice size in furnace. NEVER AS-

SUME THE ORIFICE SIZE; ALWAYS CHECK AND
VERIFY.

g. Proceed to item 3 to adjust manifold pressure.
h. Check input rate by clocking meter as described in item

2.

2. Determine natural gas input rate by clocking gas meter and
adjusting manifold pressure per item 3.

NOTE: Be sure all pressure tubing, combustion-air and vent
pipes, and burner enclosure front are in place when checking input
by clocking the gas meter.

a. Obtain average yearly heat value for local gas supply.

NOTE: Be sure heating value of gas used for calculations is
correct for your altitude. Consult local gas utility for altitude
adjustments of gas heating value.

b. Turn off all other gas appliances and pilots.
c. Start furnace and let run for 3 minutes.
d. Measure time (in sec) for gas meter test dial to complete

1 revolution.

e. Refer to Table 12 for cubic ft of gas per hr.
f. Multiply gas rate (cu ft/hr) by heating value (Btu/cu ft).

Obtain heating value from local gas utility.

EXAMPLE:
Btu heating input = Btu/cu ft X cu ft/hr
Heating value of gas = 1010 Btu/cu ft
Time for 1 revolution of 2-cu-ft dial = 72 sec
Gas rate = 100 cu ft/hr (from Table 12)
Btu heating input = 100 X 1010 = 101,000 Btuh
In this example, the orifice size and manifold pressure
adjustment is within ±2 percent of the furnace input rate.

g. Measured gas input must not exceed gas input on unit

rating plate.

NOTE: High altitude—Gas input on rating plate is for altitudes
up to 2000 ft. Ratings for altitudes over 2000 ft must be 4 percent
less for each 1000 ft above sea level. To obtain the adjusted
altitude rating, adjust the manifold pressure (see item 3) and
replace the main burner orifices as needed. Refer to NFGC
Appendix F, Table F-4 for proper orifice sizing at high altitudes.

NOTE: In Canada, from 2000 to 4500 ft above sea level, derate
the unit 10 percent from the Conversion Station.

h. Proceed to item 3 to adjust manifold pressure.

3. Adjust gas input.

NOTE: Manifold pressure must always be measured with the
burner enclosure front REMOVED. The gas meter must always be
clocked with the burner enclosure front INSTALLED. The gas
valve has been nominally set at 3.5-in. wc high heat and 1.5-in. wc
low heat for natural gas.

a. Remove burner enclosure front and caps that conceal

adjustment screws for gas valve regulator. (See Fig. 46.)

b. Turn setup switch SW-2 on control center to ON

position. (See Fig. 25.) This will keep furnace locked in
low-heat operation.

c. Turn low-heat adjusting screw (5/64 hex Allen wrench)

counterclockwise (out) to decrease input rate or clock­wise (in) to increase rate. When adjusting input rate, DO
NOT set manifold pressure less than 1.3-in. or more than

1.7-in. wc for natural gas. Make any major adjustments
by changing main burner orifices.

d. Turn setup switch SW-2 to OFF position after low fire

adjustment.

e. Jumper R-W2 on control center thermostat connections.

(See Fig. 25.) This will keep furnace locked in high-heat
operations.

f. Turn high-heat adjusting screw (5/64 hex Allen wrench)

counterclockwise (out) to decrease input rate or clock­wise (in) to increase rate. When adjusting input rate, DO
NOT set manifold pressure less than 3.2-in. or more than

3.8-in. wc for natural gas. Make any major adjustment by
changing main burner orifices.

NOTE: If orifices are changed, both high-heat and low-heat input
rate must be readjusted.
NOTE: If orifice hole appears damaged or it is suspected to have
been redrilled, check the orifice hole with a numbered drill bit of
the correct size. Never redrill an orifice. A burr-free and squarely
aligned orifice hole is essential for proper flame characteristics.

g. Remove jumper R-W2 after high-heat adjustment.
h. Replace burner enclosure front and measure adjusted gas

input rate using method outlined in item 2.

i. Replace caps that conceal gas valve regulator adjustment

screws.

—35—

TABLE 11—MODEL 355MAV ORIFICE SIZE AND MANIFOLD PRESSURE FOR CORRECT INPUT RATE

(Tabulated Data Based on Altitude Up to 2000 ft and 20,000 Btuh High Heat/13,000 Btuh Low Heat Per Burner)

GAS HEAT

VALUE

(BTU/CU FT)

860 43 3.7/1.6 43 3.8/1.6 42 3.2/1.4 42 3.3/1.4 42 3.4/1.5

875 43 3.6/1.5 43 3.7/1.6 43 3.8/1.6 42 3.2/1.4 42 3.3/1.4 42 3.4/1.4

890 43 3.5/1.5 43 3.6/1.5 43 3.7/1.6 43 3.8/1.6 42 3.2/1.4 42 3.3/1.4 42 3.4/1.4

905

920

935 44 3.6/1.5

950 44 3.5/1.5 44 3.6/1.5

965 44 3.4/1.4 44 3.5/1.5 44 3.6/1.5

980 44 3.3/1.4 44 3.4/1.4 44 3.5/1.5 44 3.6/1.5

995

1010 45 3.7/1.6

1025

1040

1055

1070

1085

1100

0.58 0.60 0.62 0.64 0.66 0.68 0.70 0.72

Orf

Heat

No.

High/Low

43443.3/1.3

3.7/1.5

43443.2/1.3

3.7/1.54344

44453.2/1.3

3.8/1.6

45463.6/1.5

3.8/1.6

45463.5/1.5

3.7/1.64546

45463.4/1.4

3.6/1.54546

45463.3/1.4

3.5/1.54546

45

3.2/1.4

46

3.4/1.4

47

3.8/1.6

46473.3/1.4

3.7/1.64546

Orf

Heat

No.

High/Low

43 3.5/1.4 43 3.6/1.5 43 3.7/1.5 43 3.8/1.6 42 3.2/1.4 42 3.3/1.4 42 3.4/1.4

3.3/1.4

3.8/1.6

43443.2/1.4

3.7/1.64344

44 3.3/1.4 44 3.4/1.4 44 3.5/1.5 44 3.6/1.5

44453.2/1.3

3.8/1.6

45 3.7/1.6 44 3.2/1.3 44 3.3/1.4 44 3.4/1.4 44 3.5/1.5 44 3.6/1.5

3.6/1.5

3.8/1.6

3.5/1.5

3.7/1.64546

3.4/1.4

3.6/1.54546

45463.3/1.4

3.5/1.54546

3.2/1.4

3.4/1.44546

Orf
No.

43 3.5/1.4 43 3.6/1.5 43 3.7/1.5 43 3.8/1.5 42 3.2/1.3 42 3.3/1.3

43443.2/1.4

44 3.3/1.4 44 3.4/1.4 44 3.5/1.5 44 3.6/1.5

45 3.7/1.6 44 3.2/1.3 44 3.3/1.4 44 3.4/1.4 44 3.5/1.5 44 3.6/1.5

CAUTION: Be sure burner enclosure front is in place
after adjustments have been made.

SPECIFIC GRAVITY OF NATURAL GAS

Heat

High/Low

3.3/1.4

3.8/1.6

3.7/1.64344

3.6/1.5

3.8/1.6

3.5/1.5

3.7/1.64546

3.4/1.5

3.6/1.54546

3.4/1.4

3.5/1.54546

Orf

Heat

No.

High/Low

43 3.5/1.5 43 3.6/1.5 43 3.7/1.5 43 3.8/1.6 42 3.2/1.3

3.3/1.4

3.8/1.6

43443.2/1.4

3.7/1.64344

45 3.8/1.6 44 3.2/1.3 44 3.3/1.4 44 3.4/1.4 44 3.5/1.5

3.7/1.5

3.8/1.6

3.6/1.5

3.7/1.6

3.5/1.5

3.6/1.54546

Orf

No.

High/Low

43 3.4/1.5 43 3.6/1.5 43 3.7/1.5 43 3.8/1.6

3.3/1.4

3.8/1.6

43443.2/1.4

3.7/1.64344

45 3.8/1.6 44 3.2/1.4 44 3.3/1.4 44 3.4/1.4

45 3.7/1.5 45 3.8/1.6 44 3.2/1.4 44 3.3/1.4

3.6/1.5

3.8/1.6

OFF position and jumper R-W2 on control center. DO NOT forget
to return setup switch to OFF position and remove R-W2 jumper
upon completion of testing. (See Fig. 25 for switch and terminal

Heat

Orf

Heat

No.

High/Low

41423.2/1.4

3.6/1.54142

43 3.4/1.5 43 3.5/1.5 43 3.6/1.5

3.3/1.4

3.8/1.6

43443.2/1.4

3.7/1.64344

45 3.7/1.6 45 3.8/1.6 44 3.2/1.4

Orf

Heat

No.

High/Low

3.3/1.4

3.7/1.54142

41423.2/1.3

3.5/1.54142

43 3.4/1.5 43 3.5/1.5

3.3/1.4

3.8/1.6

43443.2/1.4

3.7/1.64344

location.)

j. Look through sight glass in burner enclosure and check

burner flame. The burner flame should be clear blue,
almost transparent. (See Fig. 47.)

B. Set Temperature Rise

CAUTION:

Temperature rise must be within limits specified on unit
rating plate. Recommended operation is at midpoint of
rise or above. Failure to follow this caution may result in
condensing or overheating the heat exchangers.

3. This furnace is capable of automatically providing the
proper airflow to maintain the temperature rise within the
range specified on the unit rating plate. If the temperature
rise is outside this range, proceed as follows:

a. Check gas input for low- and high-heat operation.
b. Check derate for altitude if applicable.
c. Check all return and supply ducts for excessive restric-

tions causing static pressure greater than 0.5-in. wc.

d. Ensure bypass humidifier switch (BPH) setup switch

SW-3 on control center is in ON position when a bypass

Furnace must operate within range of temperature rise specified on
the unit rating plate. Determine air temperature rise as follows:

1. Place thermometers in return and supply ducts as near
furnace as possible. Be sure thermometers do not see heat
exchanger so that radiant heat does not affect readings. This
practice is particularly important with straight-run ducts.

2. When thermometer readings stabilize, subtract return-air
temperature from supply-air temperature to determine air
temperature rise.

NOTE: Temperature rise can be determined for low-fire opera­tion by placing setup switch SW-2 on control center in the ON
position. For high-heat operation, place setup switch SW-2 in the

C. Set Thermostat Heat Anticipator

The thermostat heat anticipator must be set to match the amp draw
of the components in the R-W/W1 circuit. Accurate amp draw
measurements can be obtained at the thermostat subbase terminals
R and W.

Fig. 48 illustrates an easy method of obtaining thermostat amp
draw measurements. The amp reading should be taken after the
blower motor has started and furnace is operating in low heat.

humidifier is used. (See Fig. 25 for switch location.)

e. Check Troubleshooting Guide for Gas-Fired Condensing

Furnaces.

Orf

Heat

No.

High/Low

3.4/1.4

3.8/1.6

3.3/1.4

3.6/1.5

41423.2/1.3

3.5/1.5

43 3.4/1.4

3.3/1.4

3.8/1.6

43443.2/1.4

3.7/1.6

—36—

SECONDS

BURNER FLAME

BURNER

MANIFOLD

FOR 1

REVOLUTION

10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49

TABLE 12—GAS RATE CU FT/HR

1800
1636
1500
1385
1286
1200
1125
1059
1000

947
900
857
818
783
750
720
692
667
643
621
600
581
563
545
529
514
500
486
474
462
450
439
429
419
409
400
391
383
375
367

SECONDS

FOR 1

REVOLUTION

50
51
52
53
54
55
56
57
58
59
60
62
64
66
68
70
72
74
76
78
80
82
84
86
88
90
92
94
96

98
100
102
104
106
108

110
112
116
120

SIZE OF TEST DIAL

1

cu ft2cu ft5cu ft

72
71
69
68
67
65
64
63
62
61
60
58
56
54
53
51
50
48
47
46
45
44
43
42
41
40
39
38
38
37
36
35
35
34
33

33
32
31
30

SIZE OF TEST DIAL

1

cu ft2cu ft5cu ft

360

720

327

655

300

600

277

555

257

514

240

480

225

450

212

424

200

400

189

379

180

360

171

343

164

327

157

313

150

300

144

288

138

277

133

267

129

257

124

248

120

240

116

232

113

225

109

218

106

212

103

206

100

200

97

195

95

189

92

185

90

180

88

176

86

172

84

167

82

164

80

160

78

157

76

153

75

150

73

147

144
141
138
136
133
131
129
126
124
122
120
116
112
109
106
103
100

97
95
92
90
88
86
84
82
80
78
76
75
74
72
71
69
68
67

65
64
62
60

360
355
346
340
333
327
321
316
310
305
300
290
281
273
265
257
250
243
237
231
225
220
214
209
205
200
196
192
188
184
180
178
173
170
167

164
161
155
150

BURNER 

ORIFICE

A93059

CAUTION: DO NOT redrill orifices. Improper drilling
(burrs, out-of-round holes, etc.) can cause excessive
burner noise and misdirection of burner flames. This can
result in flame impingement of burners and heat exchang­ers, causing failures.

Fig. 46—Redundant Automatic Gas Valve

1. To operate furnace in low heat, turn setup switch SW-2 to
ON position (See Fig. 25) and connect ammeter leads
across thermostat subbase R-W.

2. See the thermostat manufacturer’s instructions for adjusting
the heat anticipator and for varying the heating cycle length.

NOTE: When using an electronic thermostat, set the cycle rate for
3 cycles per hr.

3. Return setup switch SW-2 to OFF position and replace
thermostat on subbase.

CHECK SAFETY CONTROLS

I. CHECK PRIMARY LIMIT CONTROL

This control shuts off the combustion control system and energizes
the air-circulating blower motor if the furnace overheats.

1. The recommended method of checking this limit control is
to gradually block off the return air after the furnace has
been operating for a period of at least 5 minutes.

A93085

A89020

Fig. 47—Burner Flame

2. As soon as the limit control has shut off the burners, a 33
fault will appear on the control center.

3. The return-air opening should be unblocked to permit
normal air circulation.

By using this method to check the limit control, it can be
established that the limit is functioning properly and the furnace
will operate safely if there is a restricted return-air supply or motor
failure. If the limit control does not function during this test, the
cause must be determined and corrected.

II. CHECK PRESSURE SWITCH

This control proves operation of the draft inducer. Check switch
operation as follows:

1. Turn off 115-v power to furnace.

2. Remove control access door and disconnect inducer motor
12-pin wire harness at inducer motor.

3. Turn on 115-v power to furnace.

4. Set thermostat to "call for heat." When the pressure
switches are functioning properly, fault code 42 will flash
on the control center approximately 10 sec after the
thermostat switch is closed. If either fault code 31 or 32 is

—37—

THERMOSTAT SUBBASE
TERMINALS WITH
THERMOSTAT REMOVED

HOOK-AROUND

VOLT/AMMETER

5. Turn off 115-v power to furnace.

6. Reconnect inducer motor wire harness. Reinstall furnace
access door.

7. Turn on 115-v power to furnace.

R Y W G

10 TURNS

FROM UNIT 24-VOLT
TERMINAL BLOCK

EXAMPLE:

5.0 AMPS ON AMMETER
10 TURNS AROUND JAWS

= 0.5 AMPS FOR THERMOSTAT SETTING

Fig. 48—Amp Draw Check with Ammeter

flashed when the ICM inducer motor is disconnected, the
furnace will shut itself down immediately. Determine the
reason the pressure switches did not function properly and
correct the condition.

A80201

8. Reset thermostat to desired temperature.

CHECKLIST

1. Put away tools and instruments. Clean up debris.

2. Verify manual reset switch has continuity.

3. Verify that blower and control access doors are properly
installed.

4. Cycle test furnace with room thermostat.

5. Check operation of accessories per manufacturer’s instruc­tions.

6. Review User’s Manual with owner.

7. Leave literature packet near furnace.

—38—

CHECKLIST—INSTALLATION

Load Calculation

____________ Heating Load (Btuh)

____________ Cooling Load (Btuh)

Condensate Drain

________ Unit Level or Pitched Forward

________

Internal Tubing Connections Free of
Kinks and Traps

____________ Furnace Model Selection

COMBUSTION AND VENT PIPING

Termination Location

________ Roof or Sidewall

________ Termination Kit — 2 Pipe or Concentric

________ Combustion-Air Pipe Length

________ Combustion-Air Pipe Elbow Quantity

________ Vent Pipe Length

________ Vent Pipe Length Quantity

________

________ Pipe Sloped To Furnace

________ Over Ceilings

Pipe Diameter Determined from Sizing
Table

Pipe Insulation

________

________

________ Heat Tape Installed if Required

________

________ Temperature Rise Adjusted

________ Anticipator Setting Adjusted or

________ Cycle Rate (3 Cycles per Hr) Selected

Safety Controls Check Operation

________ Primary Limit

________ Pressure Switch

External Drain Connection Leak Tight
and Sloped

Condensate Trap Primed before
Start-Up

CHECKLIST—START-UP

Gas Input Rate (Set Within 2 percent
of Rating Plate)

Thermostat Anticipator

________ Low-Ambient Exposed Pipes

—39—

SERVICE TRAINING

Packaged Service Training programs are an excellent way to increase your
knowledge of the equipment discussed in this manual, including:
 • Unit Familiarization • Maintenance
 • Installation Overview • Operating Sequence
A large selection of product, theory, and skills programs is available, using popular
video-based formats and materials. All include video and/or slides, plus companion
book.

Classroom Service Training plus "hands-on" the products in our labs can mean
increased confidence that really pays dividends in faster troubleshooting, fewer
callbacks. Course descriptions and schedules are in our catalog.


CALL FOR FREE CATALOG 1-800-962-9212



[ ] Packaged Service Training [ ] Classroom Service Training

A94328

© 1995 BDP Co. • P.O. Box 70 • Indianapolis, IN 46206 Printed in U.S.A.

—40—

355m403 Catalog No. BDP-3335-504