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GNA-2538 R0
43
Sequence of Operation / Flame Recovery / Safety Lockout
•
Start-Up - Heat Mode:
1. When a call for heat is received from the thermostat supplying 120VAC to L1, the control will reset,
perform a self-check routine, flash the contol board diagnostic LED and begin a pre-purge delay.
2. Following the pre-purge period, the solenoid gas valve is energized and sparking commences for the Trial
For Ignition (TFI) period.
3. When flame is detected during the TFI, the sparking process is terminated and the gas valve remains
energized.
4. The thermostat and burner flame are constantly monitored to assure proper system operation. When
the thermostat is satisfied and the demand for heat ends, the solenoid gas valve is immediately
de-energized.
•
Failure to Light - Lockout:
1.
MULTI TRIAL MODEL
–
Should the burner fail to light or the flame is not detected during the TFI period, the gas valve will
de-energize. The control will then go through an inter-purge delay before an additional ignition
attempt.
–
The control attempts two additional ignition trials before de-energizing the solenoid gas valve and
entering lockout. The LED will indicate the ignition lockout.
TRANSITION
HI LIMIT
(INSIDE BOX)
TERMINAL
BLOCK
FENWAL
CONTROL
BOARD
HEATER BODY
HI LIMIT
(INSIDE BOX)
POWER IN CABLE
(CONNECTED TO FAN)
AIRSWITCH
ON/OFF
SWITCH
3A FUSE
INDICATOR
LIGHT
1.5A FUSE
2.
FLAME FAILURE - RE-IGNITION MODE
–
If the established flame signal is lost while the burner is operating, the control will respond within 0.8
seconds by immediately energizing the H.V. spark for the TFI period in an attempt to relight the
flame.
–
If the burner does not light within the TFI, the gas valve will immediately de-energize and a new TFI
sequence will begin after an inter-purge delay.
–
Multi-try models perform two additional attempts to light the burner before de-energizing the
solenoid gas valve and entering lockout. If the burner relights, normal operation resumes.
AXIAL FAN HEATER – LP AND NG-FIRED HEATER
Содержание GGH-8361LO
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