Furnace User Manual

UHD LOW PROFILE DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL
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10.4 UHD[X][S] Series Ladder Wiring Diagram
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.
FLAME
SENSOR
PRESSURE SWITCH
THERMOSTAT CONNECTION
6
3
4
5
2
1
120 VAC
TRANSFORMER
FLUE BLOWER
GAS VALVE
ELECTRODE
IGNITION
MODULE
FLAME
SPARK
LIMIT SWITCH
LIMIT SWITCH (UHD 300, 350, 400 ONLY)
MANUAL RESET LIMIT SWITCH
(UHD 75 ONLY)
FLUE BLOWER