Roberts Gorden UHD[X][S][R] 300, UHD[X][S][R] 250, UHD[X][S][R] 400 Internal Wiring Diagram

UHD STANDARD DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL

9.3 Internal Wiring Diagram

L2 L1

FLUE
BLOWER
	WHITE
	GREEN
PRESSURE SWITCH	BLUE
	BLUE
LIMIT SWITCH (UHD 300, 350, 400 ONLY)	ORANGE
	ORANGE
MANUAL RESET LIMIT SWITCH (RESIDENTAL UNITS ONLY)	LIMIT SWITCH
SENSE	BLACK
ELECTRODE	BLACK
	BLACK

24 VAC HOT

ORANGE

FLAME

WHITE
WHITE	BLACK	GREEN
GREEN		GAS VALVE
3	1	BLACK
TRANSFORMER
4	5

	BLUE		YELLOW
					YELLOW
						BROWN
GROUND
	6	5	4
	3	2	1
				R		R = 24 VAC TO THERMOSTAT (RED)
				G		G = MANUAL FAN INPUT FROM THERMOSTAT (GREEN)
	ORANGE			W		W = HEAT DEMAND INPUT FROM THERMOSTAT (WHITE)
				C		C = COMMON GROUND TO THERMOSTAT

IGNITION MODULE

THERMOSTAT INPUT: FIELD SUPPLIED

BLACK

CMB BLOWER

ACC

L1

IMPORTANT:

For field wiring into service junction box, or if any of the original wire supplied with the heater

must be replaced, it must be replaced with wiring material having a temperature rating of at least 105 °C (221 °F) and 600 V. For supply connections, use No. 14 AWG or larger wires.

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