Installation guide

ManualsBrandsColeman ManualsFurnaceOfficial Coleman gas furnace

66840/035-20003-001Rev.B(1205)

Improper installation in an ambient below 32°t: (0.0 ° C) could create

a hazard, resulting in damage, injury or death.

3. If this furnace is installed in an unconditioned space and an

extended power failure occurs, there will be potential damage to

the internal components. Following a power failure situation, do

not operate the unit until inspection and repairs are performed.

Clearances for access:

Ample clearances should be provided to permit easy access to the unit.

The following minimum clearances are recommended:

1. Twenty-four (24) inches (61 cm) between the front d the furnace

and an adjacent wall or another appliance, when access is

required for servicing and cleaning.

2. Eighteen (18) inches (46 cm) at the side where access is required

for passage to the front when servicing or for inspection or replace-

ment of flue/vent connections.

In all cases, accessibility clearances shall take precedence over clear-

ances for combustible materials where accessibility clearances are

greater.

Installation in a residential aaraoe:

3. A gas-fired furnace for installation in a residential garage must be

installed so the burner(s) and the ignition source are located not

less than 18 inches (46 cm) above the floor, and the furnace must

be located or protected to avoid physical damage by vehicles.

TABLE 1: Unit Clearances to Combustibles

TOP FRONT REAR SIDES SINGLE WALL VENT

APPLICATION

In. (cm) In, (cm) In. (cm) In. (cm) In. (cm)

UPFLOW 1 (254) 2 (5.08) 0 (0.0) 0 (00) 6 (1524)

UPFLOW B-VENT 1 (254) 1 (2.54) 0 (0.0) 0 (00) N/A

HORIZONTAL 1 (254) 2 (5.08) 0 (0.0) 1 (5.08) 6 (1524)

HORIZONTAL B-VENT 1 (2.54)) 1 (254) 0 (0.0) 0 (00) N/A

FLOOR/ LINE

CLOSET ALCOVE ATTIC

BOTTOM CONTACT

COMBUSTIBLE YES YES YES NO

COMBUSTIBLE NO YES YES YES 1

1. Line contact only permitted between lines formed by the intersection of the rear paneI and side paneI (top in horizontal position) of the furnace jacket and buitding

joists, studs or framing

SECTION Ih DUCTWORK

DUCTWORK GENERAL INFORMATION

The duct system's design and installation must:

1. Handle an air volume appropriate for the served space and within

the operating parameters of the furnace specifications.

2. Be installed in accordance with standards of NFPA (National Fire

Protection Association) as outlined in NFPA pamphlets 90A and

90B (latest editions) or applicable national, provincial, or state, and

local fire and safety codes. In Canada refer to the National Gas

and Propane Installation Code B149.!-00, Provincial, Local Fire

and Safety Codes.

3. For manufactured (mobile) home and modular home return

duct system installation: The return air duct and the return air

plenum are required by the furnace manufacturer.

4. Complete a path for heated or cooled air to circulate through the

air conditioning and heating equipment. Air must circulate to and

from the conditioned space.

A CAUTION

The cooling coil must be installed in the supply air duct, down-

stream of the furnace. Cooled air may not be passed over the heat

exchanger.

When the furnace is used in conjunction with a cooling coil, the coil

must be installed parallel with, or in the supply air side of the furnace to

avoid condensation in the primary heat exchanger. When a parallel flow

arrangement is used, dampers or other means used to control airflow

must be adequate to prevent chilled air from entering the furnace. If

manually operated, the damper must be equipped with means to pre-

vent the furnace or the air conditioner from operating unless the damper

is in full heat or cool position.

kWARNING

The duct system must be properly sized to obtain the correct airflow

for the furnace size that is being installed.

Refer to Table 8 and the furnace rating plate for the correct rise

range and static pressures

If the ducts are undersized, the result will be high duct static pres-

sures and/or high temperature rises which can result in a heat

exchanger OVERHEATING CONDITION. This condition can result

in premature heat exchanger failure, which can result in personal

injury, property damage, or death.

DUCTWORK INSTALLATION

Upflow Instructions

Attach the supply plenum to the furnace outlet duct

connection flanges. This is typically through the use of

S cleat material when a metal plenum is used. The use

of an approved flexible duct connector is recom-

mended on all installations. This connection should be

sealed to prevent air leakage. The sheet metal should

be crosshatched to eliminate any popping of the sheet

metal when the indoor fan is energized.

When replacing an existing furnace, if the existing plenum is not the

same size as the new furnace then the existing plenum must be

removed and a new plenum installed that is the proper size for the new

furnace. If the plenum is shorter than 12" (30.5 cm) the turbulent air flow

may cause the limit controls not to operate as designed, or the limit con-

trois may not operate at all.

The duct system is a very important part of the installation. If the duct

system is improperly sized the furnace will not operate properly.

The ducts attached to the furnace plenum, should be of sufficient size

so that the furnace operates at the specified external static pressure

and within the air temperature rise specified on the nameplate.

Table 2 is a guide for determining whether the rectangular duct system

that the furnace is being connected to be of sufficient size for proper fur-

nace operation.

Use the Example below to help you in calculating the duct area to deter-

mine whether the ducts have sufficient area so that the furnace oper-

ates at the specified external static pressure and within the air

temperature rise specified on the nameplate.

4 Unitary Products Group