White Rodgers 50A55-143 Specifications, Max. Input Current @ 25 VAC 0.45 amp, 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)

	50A55-143
PRE-PURGE	30
INITIAL IGNITOR
WARM-UP (1st 64	17
attempts)
MINIMUM IGNITOR	5
WARM-UP
MAXIMUM IGNITOR	21
WARM-UP
IGNITION ACTIVATION	1
PERIOD
TRIAL FOR IGNITION	4
PERIOD
RETRIES	2 times
VALVE SEQUENCE	12
PERIOD
INTERPURGE	60
POST-PURGE	5
LOCKOUT TIME	300
DELAY TO HEAT ON	15/30/
	45/60
DELAY TO HEAT OFF	60/90/
	120/180
DELAY TO COOL ON	0
DELAY TO COOL OFF	90
AUTO RESET	70 minutes
HUMIDIFIER	YES
ELECTRONIC AIR	YES
CLEANER

2