White Rodgers 50a55-286 manual

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Table of contents for the manual

  • Page 1

    GENERAL PRECAUTION ! Application of this type of control may cause flame rollout on initial start-up and could cause personal injury and/or property damage. Replace only with exact model number, includ- ing dash number. Failure to use exact replace- ment control could cause personal injury and/or property damage. If in doubt about whether your wiri[...]

  • 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) Flame Current Requirements: Minimum current to insure flame detection: 1 µ a DC* Maximum current for[...]

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

  • 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 C MV (2 terminals) TR TH RO1 RO2 FP PS HLI HLO GND (unused terminal) IND IGN IND N IGN N COOL HEAT PARK (2 terminals) LINE XFMR EAC (optional) HUM (optional) CIR N LINE N XFMR N EAC N (optional) [...]

  • Page 6

    6 OPERA TION OPTION SWITCHES The option switches on the 50A55-286 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 DIAGNOSTIC FEATURES The 50A55 control continuously monitors its own opera- tion and the operation of the system. If a failure occurs, the LED will indicate a failure code as shown below. If the failure is internal to the control, the light will stay on continuously. In this case, the entire control should be replaced, as the control is not field-[...]

  • 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.[...]