INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL INJURY AND/OR PROPERTY DAMAGE. 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.
The control is factory-set at 30 seconds heat delay- to-fan-on, 180 seconds heat delay-to- fan-off and 45 seconds cool delay-to- fan-off. See OPERATION section for further information. 50A55-843 2 times 30, 45 60/90/ 120/180 45, 90 60 minutes...
WARNING FIRE HAZARD • Do not exceed the specified voltage. • Replace existing control with exact model and dash number. • Protect the control from direct contact with water (dripping, spraying, rain, etc.). • Label all wires before disconnection when servic- ing controls.
(LINE) HUMIDIFIER ELECTRONIC AIR CLEANER 50A55-843 furnace(s) TWINNING APPLICATIONS FLAME SENSOR PROBE LEGEND Low Voltage (24 VAC) Line Voltage (120 VAC) N. C. = Normally closed switch N. O. = Normally open switch TYPICAL SYSTEM WIRING DIAGRAM 120 VAC 24 VAC CLASS II...
HUM N (optional) spade terminal * The twinning feature is available only on models with six screw terminals; one of these terminals will be designated “TWIN”. All 50A55-843 controls used in twinning applications must have the “TWIN” terminal. † Maximum recommended flame probe wire length is 36 inches.
OPERATION OPTION SWITCHES The option switches on the 50A55-843 control are used to determine the length of the cool delay-to-fan-off, heat delay-to- fan-on and heat delay-to-fan-off periods. The following table shows the time periods that will result from the various switch positions.
Power supplied to both furnaces must be from the same phase of the incoming 120 VAC power. Connect the TWIN screw terminals on the 50A55-843 of the furnaces to be twinned to each other using a single wire (14-22 AWG.).