Operating instructions

ManualsBrandsBryant ManualsFurnaceSeries H

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 8 with

Armaflex-type insulation. Failure to follow this caution

will result in intermittent unit operation.

CAUTION: Combustion air must not be taken from

inside structure because inside air is frequently contami-

nated 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 prod-

ucts. 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.

WARNING: Solvent cements are combustible. Keep

away from heat, sparks, and open flame. Use only in

well-ventilated areas. Avoid breathing in vapor or allow-

ing contact with skin or eyes. Failure to follow this

warning could result in fire, property damage, personal

injury, or death.

WARNING: All combustion-air and vent pipes must be

airtight and watertight. Pipes must also terminate exactly

as shown in Fig. 36, 37, 38, 39, or 40. 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 offset pipe section is recommended, as shown in Fig. 34,

to reduce excessive droplets from exiting vent pipe outlet.

COMBUSTION-AIR AND VENT PIPE DIAMETER

Determine combustion-air and vent pipe diameter.

1. Using Table 7, individually determine the smallest

combustion-air and vent pipe diameters permitted for each

pipe. Pick the larger of these 2 pipe diameters and use this

diameter for both combustion-air and vent pipes.

2. When installing vent systems of short pipe length, use the

smallest allowable pipe diameter. Do not use pipe size

greater than required or incomplete combustion, flame

disturbance, or flame sense lockout may occur.

TABLE 6—APPROVED COMBUSTION-AIR AND VENT PIPE, FITTING AND CEMENT MATERIALS

ASTM SPECIFICATION

(MARKED ON MATERIAL)

MATERIAL PIPE FITTINGS SOLVENT CEMENT AND PRIMERS DESCRIPTION

D1527 ABS Pipe — — Schedule-40

D1785 PVC Pipe — — Schedule-40

D2235 For ABS — —

Solvent

Cement

For ABS

D2241 PVC Pipe — — SDR-21 & SDR-26

D2466 PVC — Fittings — Schedule-40

D2468 ABS — Fittings — Schedule-40

D2564 For PVC — —

Solvent

Cement

For PVC

D2661 ABS Pipe Fittings — DWV at Schedule-40 IPS sizes

D2665 PVC Pipe Fittings — DWV

F438 CPVC — Fittings — Schedule-40

F441 CPVC Pipe — — Schedule-40

F442 CPVC Pipe — — SDR

F493 For CPVC — —

Solvent

Cement

For CPVC

F628 ABS Pipe — — Cellular Core DWV at Schedule-40 IPS sizes

F656 For PVC — — Primer For PVC

F891 PVC Pipe — — Cellular Core Schedule-40 & DWV

Fig. 33—Combustion-Air and Vent Pipe Connections

A96187

COMBUSTION-

AIR

COMBUSTION-

AIR

FLOW

VENT

AIR

FLOW

AIR

FLOW

AIR

FLOW

UPFLOW DOWNFLOW

HORIZONTAL-LEFT DISCHARGE HORIZONTAL-RIGHT DISCHARGE

Select 1 vent pipe connection and

1 combustion-air pipe connection.

COMBUSTION-

AIR

COMBUSTION-

AIR

COMBUSTION-

AIR

COMBUSTION-

AIR

VENT

NOTE: Select 1 vent pipe connection and

1 combustion-air pipe connection.

NOTE:

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