White Rodgers 50A55-843 - Manual (Page 2)

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