White Rodgers 50A55-143 manual

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Table of contents for the manual

  • Page 1

    To prevent electrical shock and/or equipment damage, disconnect electric power to system at main fuse or circuit breaker box until installation is complete. Label all wires prior to disconnection when ser- vicing controls. Wiring errors can cause im- proper and dangerous operation. This control is not intended for use in locations where it may come[...]

  • Page 2

    2 SPECIFICA TIONS ELECTRICAL RATINGS [@ 77 ° F (25 ° C)]: Input Voltage: 25 VAC 50/60 Hz Max. Input Current @ 25 VAC: 0.45 amp Relay Load Ratings: Valve Relay: 1.5 amp @ 25 VAC 50/60 Hz 0.6 pf Ignitor Relay: 6.0 amp @ 120 VAC 50/60 Hz (resistive) Inducer Relay: 2.2 FLA–3.5 LRA @ 120 VAC Circulator Relay: 14.5 FLA–25.0 LRA @ 120 VAC Flame Curr[...]

  • Page 3

    3 MOUNTING AND WIRING Do not use on circuits exceeding specified voltage. Higher voltage will damage control and could cause shock or fire hazard. To prevent electrical shock and/or equipment damage, disconnect electric power to system at main fuse or circuit breaker box until installation is complete. Failure to earth ground the appli- ance or rev[...]

  • Page 4

    4 TH TR MV MV GND FP HLO HLI PS C R TWIN* TWIN* G W Y EAC N HUM N XFMR N LINE N CIR N IGN IND HUM EAC XFMR LINE PARK PARK HEAT COOL IGNITOR Y W G R THERMOSTAT GAS VALVE HIGH LIMIT (N. C.) ROLLOUT (N. C.) AUX. HIGH LIMIT (N. C.) PRESSURE SWITCH (N. O.) FLAME SENSOR PROBE COMPRESSOR CONTACTOR ELECTRONIC AIR CLEANER HUMIDIFIER INDUCER CIRCULATOR BLOWE[...]

  • Page 5

    5 50A55 TERMINAL TERMINAL TYPE SYSTEM COMPONENT CONNECTION TYPICAL SYSTEM WIRING TABLE * maximum recommended flame probe wire length is 36 inches. W G R Y TWIN C MV (2 terminals) TR TH RO1 RO2 FP PS HLI HLO GND (unused terminal) IND IGN COOL HEAT PARK (2 terminals) LINE XFMR EAC (optional) HUM (optional) CIR N LINE N XFMR N EAC N (optional) HUM N ([...]

  • Page 6

    6 OPERA TION OPTION SWITCHES The option switches on the 50A55-143 control are used to determine the length of the heat delay-to-fan-off periods. The following table shows the time periods that will result from the various switch positions. HEA T MODE In a typical system, a call for heat is initiated by closing the thermostat contacts. This starts t[...]

  • Page 7

    7 SYSTEM LOCKOUT AND DIAGNOSTIC FEA TURES SYSTEM LOCKOUT FEATURES When system lockout occurs, the gas valve is de-ener- gized, the circulator blower is energized at heat speed, and, if flame is sensed, the inducer blower is energized. The diagnostic indicator light will flash or glow continu- ously to indicate system status. (System lockout will ne[...]

  • Page 8

    MOUNTING HOLE TEMPLA TE FOR MOUNTING HOLE LOCA TIONS 4.172 ± .007 (2 plcs.) 6.402 ± .010 (2 plcs.) Refer to page 3 of the installation instructions for proper installation.[...]