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