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28
HL2-DS
Series
4.0
Operation
•
Sequence of Operation
4.0
Operation
Sequence of Operation
Standby:
The circuit board continually checks for internal faults, circuit integrity, and relay contact
positioning.
Starting Circuit:
Upon a call for heat, the control verifies that the differential switch is in the proper
position (open). The control energizes the fan. Once operational static pressure is achieved, the
differential switch will close initiating the ignition sequence. The glo-bar is powered and the gas
valve opens after 45 seconds. If the flame is not sensed, the heater will attempt to re-ignite for a
total of three (3) trials for ignition before proceeding to soft lockout.
Low Fire Running Circuit:
After ignition, the flame rod monitors burner flame. If sense of flame is lost,
the control closes the gas valve within one second and a new trial sequence (identical to the
starting sequence) is initiated. If flame sense is not established within 8.5 seconds, the heater will
attempt two (2) additional ignition sequences before proceeding to soft lockout. The control can
be reset by briefly interrupting the power source.
High Fire Running Circuit:
The second stage on the gas valve is powered directly from the second
stage of the thermostat. In order for two stage to flow to a higher output, single stage must be
energized as well. The thermostat determines which stage to maintain for the desired
temperature.
Shut Down:
When the thermostat is satisfied, the fan will enter a two (2) minute post-purge cycle.
Содержание HL2-DS Series
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