Bryant 355CAV installation instructions Maximum Capacity of Pipe, Electrical Shock Hazard, Wiring

Table 3 – Maximum Capacity of Pipe*

NOMINAL	INTERNAL		LENGTH OF PIPE (FT/M)
IRON
PIPE	DIAMETER
		10/	20/	30/	40/	50/
SIZE	(IN.)
		3.0	6.1	9.1	12.2	15.2
(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
1---1/2	1.610	2100	1460	1180	990	900

*Cubic ft of gas per hr for gas pressure 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 9--- 2 NFPA 54--- 2002.

NOTE: The gas valve inlet pressure tap connection is suitable to use as test gauge connection providing test pressure DOES NOT exceed maximum 0.5 psig (14-in. wc) stated on gas valve. (See Fig. 60.)

Piping should be pressure and leak tested in accordance with NFGC in the United States or CAN/CSA-B149.1-05 in Canada, local, and national plumbing and gas codes before the furnace has been connected. 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), turn off electric shutoff switch 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 at furnace prior to placing it into service.

The gas supply pressure shall be within the maximum (13.6-in. wc) and minimum (4.5-in.wc) inlet supply pressures marked on the rating plate with the furnace burners ON at HI-HEAT and OFF.

Electrical Connections

See Fig. 29 for field wiring diagram showing typical field 115-v and 24-v wiring. Check all factory and field electrical connections for tightness.

!WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury or death.

Blower access door switch opens 115-v power to furnace control. No component operation can occur. Do not bypass or close switch with panel removed.

!WARNING

UNIT MAY NOT OPERATE

Failure to follow this caution may result in intermittent unit operation.

Furnace control must be grounded for proper operation or control will lock out. Control is grounded through green/yellow wire connected to gas valve and burner box screw.

115-v Wiring

Before proceeding with electrical connections, make certain that voltage, frequency, and phase correspond to that specified on furnace rating plate. Also, check to be sure that service provided by power supply is sufficient to handle load imposed by this equipment. Refer to rating plate or Table 4 for equipment electrical specifications.

Make all electrical connections in accordance with National Electrical Code (NEC) ANSI/NFPA 70-2005 and any local codes or ordinances that might apply. For Canadian installations, all electrical connections must be made in accordance with Canadian Electrical Code CSA C22.1 or authorities having jurisdiction.

Field-supplied wiring shall conform with the limitations of 63_F (33_C) rise.

The furnace must be electrically grounded in accordance with local codes; or in the absence of local codes, with the National Electric Code ANSI/NFPA 70 and/or the Canadian Electric Code, CSA C22.1, Part I, if an external electrical source is utilized.

Use a separate branch electrical circuit containing a properly sized fuse or circuit breaker for this furnace. See Table 4 for wire 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 or furnace is not grounded properly, furnace control status code indicator light will flash rapidly and furnace will NOT operate.

!WARNING

FIRE HAZARD

Failure to follow this warning could result in personal injury, death, or property damage.

Do not connect aluminum wire between disconnect switch and furnace. Use only copper wire. (See Fig. 30.)

355CAV

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