
TWO-STAGE GAS VALVE
1/8 NPTx3/4 IN. (19.1 MM) CLOSE PIPE NIPPLE
1/8 NPTx3/4 IN. (19.1 MM) CLOSE PIPE NIPPLE
1/8 ELBOW
1/8 ELBOW
O
1/8 NPTx 2 IN. (50.8 MM) NIPPLE
LOW GAS PRESSURE SWITCH
Fig. 10 - Installing Elbows, Nipples, and Pressure Switch on Two-Stage Units
A09016
FURNACE CONTROL BOARD
PLUG P1
1 2 3 4 5 6 7 8 _
YEL
LEGEND
ORN = ORANGE
YEL = YELLOW
ORN -_ ORN _--
LGPS = LOW GAS PRESSURE SWITCH
CAPS = COMBUSTION AIR PRESSURE SWITCH
O = QUICK CONNECTION
Fig. 11 - Pressure Switch Wiring for Two-Stage Units
A06487
10
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