White Rodgers 50A55 843 Universal Silicon Carbide Integrated Furnace Control Wiring Diagram 83 Of Rodgers_catalog_R 4425_
2015-03-28
: White-Rodgers White-Rodgers-50A55-843-Universal-Silicon-Carbide-Integrated-Furnace-Control-Wiring-Diagram-676625 white-rodgers-50a55-843-universal-silicon-carbide-integrated-furnace-control-wiring-diagram-676625 white-rodgers pdf
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WIRING AND CONFIGURATION 50A55-843 50A55-843 TYPICAL SYSTEM WIRING DIAGRAM HOT (LINE) NEUTRAL (LINE) 120 VAC 24 VAC CLASS II TRANSFORMER TH 24 VAC TR 50A55 COOL HEAT PARK PARK LINE XFMR EAC HUM INDUCER HUMIDIFIER CIRCULATOR BLOWER IND IGN IND N IGN N IGNITOR CIR N LINE N XFMR N HUM N EAC N ELECTRONIC AIR CLEANER 50A55-843 in other furnace(s) — TWINNING APPLICATIONS ONLY TWIN* Y Y W W G G R R C COMPRESSOR CONTACTOR THERMOSTAT TWIN* PRESSURE SWITCH (N. O.) FLAME SENSOR PROBE PS HLI HLO FP RO1 GND RO2 MV MV TR TH HIGH LIMIT (N. C.) ROLLOUT (N. C.) AUX. HIGH LIMIT (N. C.) GAS VALVE Low Voltage (24 VAC) Line Voltage (120 VAC) N. C. = Normally closed switch N. O. = Normally open switch Flame Current Requirements: Minimum current to insure flame detection.............1 µa DC➀ Maximum current for non-detection......................0.1 µa DC➀ Maximum allowable leakage resistance.............. 100 M ohms Flame establishing time.......................0.8 seconds maximum Flame failure response time................2.0 seconds maximum ➀ Measured with a DC microammeter in the flame probe lead www.white-rodgers.com 183 TECHNICAL HELP LEGEND WIRING AND CONFIGURATION 50A55-843 The 50A55-843 is an automatic gas interrupted ignition control that employs a microprocessor to continually monitor, analyze, and control the proper operation of the gas burner, inducer, and fan. Signals interpreted during continual surveillance of the thermostat and flame sensing element initiate automatic ignition of the burner, sensing of the flame, and system shut-off during normal operation. the compressor. The cool delay-to-fan-on period begins. After the delay period ends, the optional electronic air cleaner is energized, and the circulator fan is energized at cool speed. After the thermostat is satisfied, the compressor is deenergized and the cool mode delay-to-fan-off period begins. After the delay-to-fan-off period ends, the circulator fan and electronic air cleaner (optional) are de-energized. OPTION SWITCHES If the thermostat fan switch is moved to the ON position, the circulator fan (cool speed) and optional electronic air cleaner are energized. When the fan switch is returned to the AUTO position, the circulator fan and electronic air cleaner (optional) are de-energized. The option switches on the 50A55-843 control are used to determine the length of the cool delay-to-fan-off, heat delayto-fan-on and heat delay-to-fan-off periods. The following table shows the time periods that will result from the various switch positions. OPTION SWITCH POSITIONS COOL delayto-fan-off: Set switch #1 45 sec.* 90 sec. On Off HEAT delayto-fan-on: Set switch #2 30 sec.* 45 sec. On Off HEAT delayto-fan-off: Set switch #3 #4 60 sec. 90 sec. 120 sec. 180 sec.* On Off On Off To reset the control after system lockout, do one of the following: 1. Interrupt the call for heat or cool at the thermostat for at least one second but less than 20 seconds (if flame is sensed with the gas valve de-energized, interrupting the call for heat at the thermostat will not reset the control). On On Off Off TECHNICAL HELP HEAT MODE In a typical system, a call for heat is initiated by closing the thermostat contacts. This starts the 50A55 control’s heating sequence. The inducer blower and optional humidifier are energized and the ignitor is powered within one second. This controller has an adaptive algorithm that adjusts the duration of the ignitor warm-up, to extend ignitor life. Upon initial application of power, the warm-up time is 17 seconds. The ignitor on-time will then be increased or decreased depending on whether or not flame is achieved. The warm-up time is limited to a maximum of 21 seconds. During the first 64 warm-up periods following power-up, the warm-up time may not be less than 17 seconds. Upon a call for heat, if the warm-up time has not been locked, it will be decreased by one second. This reduction of the ignitor on-time will continue until flame fails to be achieved (resulting in a retry). In the event of a retry, the warm-up time will be increased by two seconds and locked in at that duration. Once the warmup time is locked, it remains fixed until another call for heat results in a retry, in which case the warm-up time is again increased by two seconds and remains locked. In the event of two successive retry attempts, the warm-up time will be unlocked and set to 21 seconds. If flame is then achieved, the warm-up time will begin adapting again with the next call for heat. If, however, this third attempt fails to achieve flame, the control will go into system lockout. At the end of the ignitor warm-up time, both valves in the 36E manifold gas valve are opened. Flame must be detected within 4 seconds. See installation instructions for more system sequence detail. In a typical system, a call for cool is initiated by closing the thermostat contacts. This energizes the 50A55 control and 184 SYSTEM LOCKOUT FEATURES When system lockout occurs, the gas valve is de-energized, 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 continuously to indicate system status. (System lockout will never override the precautionary features.) * Factory setting COOL MODE MANUAL FAN ON MODE 2. Interrupt the 24 VAC power at the control for at least one second. You may also need to reset the flame rollout sensor switch. 3. After one hour in lockout, the control will automatically reset itself. DIAGNOSTIC FEATURES The 50A55-843 control continuously monitors its own operation 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-repairable. If the sensed failure is in the system (external to the control), the LED will flash in the following flash-pause sequences to indicate failure status (each flash will last approximately 0.25 seconds, and each pause will last approximately 2 seconds). 1 flash, then pause 2 flashes, then pause 3 flashes, then pause 4 flashes, then pause 5 flashes, then pause 6 flashes, then pause System lockout Pressure switch stuck closed Pressure switch stuck open Open limit switch Open rollout switch 115 Volt AC power reversed / Improper ground 7 flashes, then pause Low flame sense signal Continuous flashing Flame has been sensed when (no pause) no flame should be present (no call for heat) The LED will also flash once at power-up. Trane application - Jumper wire 151-2906 (provided with control) must be installed on the furnace from R01 to R02 of the 12-pin connector. www.white-rodgers.com
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