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SPECIFICATIONS
ELECTRICAL RATINGS [@ 77°F (25°C)]:
Input Voltage: 25 VAC 60 Hz
Max. Input Current @ 25 VAC: 0.5 amp + MV Load
Relay Load Ratings:
Valve Relay: 1.5 amp @ 24 VAC 60 Hz 0.6 pf
Ignitor Relay: 5.0 amp @ 120 VAC 60 Hz
(resistive)
Circulator Relay: 11 FLA–26.0 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
Timing Specification
Pre-Purge
Initial Ignitor Warm-Up Duration of ignitor warm-up time on the first 64 attempts.
Retry Ignitor Warm-Up Duration of ignitor warm-up time if the control retries.
Ignition Activation
Period
Trial for Ignition
Retries
Valve Sequence
Period
Inter-Purge
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
*These times will vary depending on option switch position. See INSTALLATION section for further information.
Timing Specifications
(All times are in seconds, unless noted otherwise)
Description
Initial delay between thermostat contact closure and trial for ignition.
The period of time between energizing the main gas valve and
deactivation of the ignition means prior to the lockout time.
Period during which the valve and ignition source is activated, attempting
to ignite gas at the burner.
Additional ignition attempts if the original ignition attempt is unsuccessful.
Valve sequence period is the cumulative total amount of time that the gas
valve is energized before entering lockout.
Period between trials for ignition when both the gas valve and ignition
source are deactivated to allow unburned gas to escape before the next
trial
After all ignition cycles are complete, the control will enter post-purge.
The combustion fan will remain on to allow unburned gas to escape. After
post-purge is complete, the combustion fan will turn off.
The period of time between initiation of gas flow and the action to shut
off the gas flow in the event of failure to establish proof of the supervised
ignition source or the supervised main burner flame. Reinitiating the
lighting sequence requires a manual operation if ignition is required
before Auto reset.
Timing to allow the heat to build up in the plenum before turning on the fan.
Timing to allow the fan to run after the call for heat ends. This allows
residual heat to be removed from the heat exchanger and distributed to
the conditioned space.
Timing to allow the cooling coil to cool off before turning on the fan.
Timing to allow the fan to run after the call for cool ends. This allows
residual cooling capacity to be removed from the cooling coils and
distributed to the conditioned space.
If shutoff occurs, the control delays for a specific recycle delay period
before beginning another trial for ignition (models with retries only).
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:
Flame Establishing Time:
Flame Failure Response Time:
Gases Approved:Natural, Manufactured, Mixed, Liquified
Petroleum, and LP Gas Air Mixtures are all approved for use.
2
maximum
0.8 sec
2.0 sec
50T35-743
15
15
20
5
7
2 times
12
30
25/29
(90+ option)
300
30
90/120/150
5
60
60 minutes
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