Instruction/ maintenance manual of the product 50A66-743 White Rodgers
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WARNING F ailure to compl y with the f ollowing warnings could result in personal injury or proper ty damag e. 50A66-743 Integrated Furnace Control F AILURE T O READ AND FOLLO W ALL INSTR UCTIONS CAREFULL Y BEFORE INST ALLING OR OPERA TING THIS CONTR OL COULD CA USE PERSONAL INJUR Y AND/OR PROPER TY D AMA GE.
2 SPECIFICA TIONS ELECTRICAL RA TINGS [@ 77°F (25°C)]: Input V oltage: 25 V A C 50/60 Hz Max. InputCurrent@25 V AC: 0.45 amp Rela y Load Ratings: V alv e Rela y: 1.5 amp @ 25 V A C 50/60 Hz 0.6 pf Ignitor Rela y: 2.0 amp @ 120 V AC 50/60 Hz (resistiv e) Inducer Rela y: 2.
3 WARNING INST ALLA TION Do not short out terminals on gas valve or primary control. Short or incorrect wiring may damage the thermostat. MOUNTING AND WIRING All wiring should be installed according to local and na- tional electrical codes and ordinances.
4 FP 24 V HUM C R G W Y 120 VOLT NEUTRAL IGN IND IGN N IND N HUM EAC XFMR LINE PARK PARK PARK HEAT COOL FAN IGNITOR Y W G R THERMOSTAT COMPRESSOR CONTACTOR ELECTRONIC AIR CLEANER HUMIDIFIER INDUCER CI.
5 Terminal block with captive screws 1 / 4 ” spade terminal 1 / 4 ” spade terminal 1 / 4 ” spade terminal 1 / 4 ” spade terminal 1 / 4 ” spade terminal 1 / 4 ” spade terminal 1 / 4 ” spa.
6 OPERA TION OPTION SWITCHES The option s witches on the 50A66-743 control are used to determine the length of the heat delay-to-f an-off per iod. The f ollowing tab le shows the time periods that will result from the various s witch positions. HEAT delay- to-fan-off: Set switch #1 #2 60 sec.
7 SYSTEM LOCK OUT FEA TURES When system lock out occurs, the gas valv e is de-energized. The circulator blo wer ma y be energized at heat speed f or some f aults, and if flame is sensed, the inducer b lower is energized. The diagnostic indicator light will flash or glow continuously to indicate system status .
White-Rodgers is a business of Emerson Electric Co. The Emerson logo is a trademark and ser vice mark of Emerson Electric Co. HOMEO WNER HELP LINE: 1-800-284-2925 www .
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