White Rodgers 50A55-143 User Manual
2
SPECIFICATIONS
ELECTRICAL RATINGS [@ 77
°
F (25
°
C)]:
Input Voltage: 25 VAC 50/60 Hz
Max. Input Current @ 25 VAC: 0.45 amp
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
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
µ
a DC*
Maximum current for non-detection: 0.1
µ
a DC*
Maximum allowable leakage resistance: 100 M ohms
*Measured with a DC microammeter in the flame probe
lead
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.
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)
WARM-UP (1st 64
attempts)
MINIMUM IGNITOR
WARM-UP
WARM-UP
MAXIMUM IGNITOR
WARM-UP
WARM-UP
IGNITION ACTIVATION
PERIOD
PERIOD
TRIAL FOR IGNITION
PERIOD
PERIOD
RETRIES
VALVE SEQUENCE
PERIOD
PERIOD
INTERPURGE
POST-PURGE
LOCKOUT TIME
DELAY TO HEAT ON
DELAY TO HEAT OFF
DELAY TO COOL ON
DELAY TO COOL OFF
AUTO RESET
HUMIDIFIER
ELECTRONIC AIR
CLEANER
CLEANER
30
17
5
21
1
4
2 times
12
60
5
300
15/30/
45/60
60/90/
120/180
0
90
70 minutes
YES
YES
50A55-143