White Rodgers 50A55-474 Specifications, Operating Temperature Range, Humidity Range, Mounting

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)

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)

	50A55-474	50A55-571
PRE-PURGE	0	0
TRIAL FOR IGNITION	4	4
PERIOD
IGNITION ACTIVATION	1	1
PERIOD
RETRIES	2 times	2 times
VALVE SEQUENCE	12	12
PERIOD
INTERPURGE	60	60
POST-PURGE	5	5
LOCKOUT TIME	300	300
DELAY TO HEAT ON	45	45
DELAY TO HEAT OFF	60/100/	100
	140/180*
DELAY TO COOL ON	2	2
DELAY TO COOL OFF	0/80*	0/80†
MINIMUM IGNITOR	11	11
WARM-UP
MAXIMUM IGNITOR	21	21
WARM-UP
INITIAL IGNITOR	17	17
WARM-UP (1st 64
attempts)
HUMIDIFIER	YES	NO
ELECTRONIC AIR	YES	NO
CLEANER

*These times will vary depending on option switch position. The control is factory-set at 0 sec. delay to cool off and 100 sec. delay to heat off. See OPERATION section for further information.

†This time will vary depending on the condition of the jumper. With the jumper installed, the delay-to- cool-off is set at 0 seconds. To obtain an 80- second delay-to-cool-off, clip the jumper wire and separate the jumper legs.

2