Bryant 574D Instruction Manual download pdf (Page 16)

4. Turn off gas supply to unit. Remove manometer from

pressure tap and replace pipe plug on gas valve. (See Fig.

12.) Turn on gas to unit and check for leaks.

Measure Manifold Pressure (Propane Units)

Refer to propane kit installation instructions for properly checking

gas input.

NOTE: For installations below 2,000 ft (610 m), refer to the unit

rating plate for proper propane conversion kit. For installations

above 2,000 ft (610 m), contact your distributor for proper propane

conversion kit.

Check Burner Flame

With control access panel (see Fig. 20) removed, observe the unit

heating operation. Watch the burner flames to see if they are light

blue and soft in appearance, and that the flames are approximately

the same for each burner. Propane will have blue flame (See Fig.

13). Refer to the Maintenance section for information on burner

removal.

Table 4 – Heating Inputs

HEATING INPUT

(BTUH)

NUMBER

GAS SUPPLY PRESSURE (IN. W.C.)

MANIFOLD PRESSURE

NUMBER

ORIFICES

Natural{ Propane*{

MANIFOLD

PRES

SURE

(IN. W.C.)

ORIFICES

Min Max Min Max Natural{ Propane*†

40,000 2 4.0 13.0 11.0 13.0 3.2∼3.8 10.0∼11.0

60,000 2 4.0 13.0 11.0 13.0 3.2∼3.8 10.0∼11.0

90,000 3 4.0 13.0 11.0 13.0 3.2∼3.8 10.0∼11.0

115,000 3 4.0 13.0 11.0 13.0 3.2∼3.8 10.0∼11.0

130,000 3 4.0 13.0 11.0 13.0 3.2∼3.8 10.0∼11.0

*When a unit is converted to propane, different size orifices must be used. See separate, natural ---to ---propane conversion kit instructions.

{Based on altitudes fr om sea level to 2000 ft (610 m) above sea level. In th e U.S.A. for altitudes a bove 2000 ft (610 m), redu ce input rating 4 percent for each

additional 1000 ft (305 m) above sea level. In Canada, f rom 2000 ft (610 m) a bove sea level to 4500 ft (1372 m) above sea level , derate the unit 10 percent.

574D-- -- A

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