Bryant 345MAV instruction manual Ðmaximum Capacity of Pipe CU FT PER HR, Electrical Connections

TABLE 2ÐMAXIMUM CAPACITY OF PIPE

(CU FT PER HR)*

NOMINAL			LENGTH OF PIPE (FT)
IRON	INTERNAL
PIPE	DIAMETER
SIZE	(IN.)	10		20	30	40	50
(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

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.

*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 NFGC .

GAS

SUPPLY

MANUAL

SHUTOFF

VALVE (REQUIRED)

SEDIMENT

TRAP

UNION

A93324

Fig. 23ÐTypical Gas Pipe Arrangement

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. 40.) Piping should be pressure tested in accordance with local and national plumbing and gas codes before furnace is 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), 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.

ELECTRICAL CONNECTIONS

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

WARNING: Blower access panel door switch opens 115-v power to control center. No component operation can occur. Do not bypass or close switch with panel removed. Failure to follow this warning could result in personal injury or death.

FIELD 24-V WIRING

FIELD 115-, 208/230-, 460-V WIRING

FACTORY 24-V WIRING

FACTORY 115-V WIRING

			NOTE 2				THERMOSTAT
		FIVE		W C R	G	Y		FIELD-SUPPLIED
							TERMINALS
		WIRE						DISCONNECT
		THREE-WIRE						208/230- OR
		HEATING-
		ONLY						460-V
								THREE
BLK	BLK		W					PHASE
WHT	WHT		R
								208/230-V
	GND	GND						SINGLE
	115-V	AUXILIARY	G					PHASE
FIELD-SUPPLIED		J-BOX	C	NOTE 1				GND
DISCONNECT		CONTROL	Y				CONDENSING
		BOX					UNIT
			24-V				TWO
		TERMINAL					WIRE
			BLOCK	NOTES: 1.		Connect Y-terminal as shown for proper operation.
		FURNACE
					2.￿ Some thermostats require a "C" terminal connection as shown.

3.If any of the original wire, as supplied, must be replaced, use same type or equivalent wire.

A98209

Fig. 24ÐHeating and Cooling Application Wiring Diagram

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