Detroit-radiant-products-company FA Series Manuel d'utilisateur télécharger pdf (Page 40)

FA Series

4.0 Operation • Sequence of Operation

4.0 Operation

WARNING

This appliance does not have a pilot ignition. It is equipped with an ignition device

which automatically lights the burner. Do not attempt to light the system by hand.

WARNING

Use only your hand to turn the manual shut off. Never use tools. If the

knob will not turn by hand, don’t try to repair it; call a qualiﬁed technician.

Force or attempted repair may result in a ﬁre or explosion.

Sequence of Operation

Standby: The ignition control continually checks for internal faults, circuit integrity and relay contact

positioning. The LED is lit indicating power is applied.

Starting Circuit: Upon a call for heat, the control veriﬁes that the limit switch is closed and the

differential pressure switch is in the open position. The control energizes the induced draft motor. Once

operational static pressure is achieved the differential switch will close initiating the ignition sequence.

The control energizes the spark and main gas valve for 10 seconds. If the ﬂame is not sensed, the

control will attempt to re-ignite for a total of (3) tries for ignition before proceeding to soft lockout.

Running Circuit: After ignition, the ﬂame rod monitors burner ﬂame. If ﬂame sense is not established

within 10 seconds, the control will attempt two (2) additional ignition sequences before proceeding to

soft lockout. The control can be reset by brieﬂy interrupting the power source. If ﬂame is sensed the

control waits for a 30 second heat blower on delay and then energizes the indoor blower, the control

proceeds to steady heat mode. If sense of ﬂame is lost, the control closes the gas valve within 1

second and a new trial sequence (identical to the starting sequence) is initiated.

Shut Down: When the thermostat is satisﬁed, the control closes the valve and the induced draft motor

remains on for a 5 second post-purge period. The indoor blower is de-energized after 120 seconds.

1 2 ... 35 36 37 38 39 40 41 42 43 44 45 ... 55 56

Pas de commentaire

Detroit-radiant-products-company FA Series Manuel d'utilisateur Page 40