White Rodgers 50A55-843 Timing Specifications, Electrical Ratings @ 77F 25C, Humidity Range

SPECIFICATIONS

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 Current Requirements:

Minimum current to insure flame detection: 1 µa DC*

Maximum current for non-detection: 0.1 µa DC*

Maximum allowable leakage resistance: 100 M ohms

*Measured with a DC microammeter in the flame probe lead

OPERATING TEMPERATURE RANGE: -40° to 175°F (-40° to 80°C)

HUMIDITY RANGE:

5% to 93% relative humidity (non-condensing)

MOUNTING:

Surface mount multipoise
Timing Specs: (@ 60 Hz**)
	maximum
Flame Establishing Time:	0.8 sec
Flame Failure Response Time:	2.0 sec

**At 50 Hz, all timing specifications should be increased by 20%

Gases Approved: Natural, Manufactured, Mixed, Liquified Petroleum, and LP Gas Air Mixtures are all approved for use.

TIMING SPECIFICATIONS

(All times are in seconds, unless noted otherwise)

	50A55-843
PRE-PURGE	30
INITIAL IGNITOR WARM-UP	17
(1st 64 attempts)
MINIMUM IGNITOR WARM-	5
UP
MAXIMUM IGNITOR WARM-	21
UP
IGNITION ACTIVATION	1
PERIOD
TRIAL FOR IGNITION	4
PERIOD
RETRIES	2 times
VALVE SEQUENCE PERIOD	12
INTERPURGE	60
POST-PURGE	15
LOCKOUT TIME	300
HEAT DELAY-TO-FAN-ON*	30, 45
HEAT DELAY-TO-FAN-OFF*	60/90/
	120/180
COOL DELAY-TO-FAN-ON	5
COOL DELAY-TO-FAN-OFF*	45, 90
AUTO RESET	60 minutes
HUMIDIFIER	YES
ELECTRONIC AIR CLEANER	YES

*These times will vary depending on option switch position. 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.

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