49
14.3
SEQUENCE OF OPERATION
Operation
Display
1.
Upon call for heat the control turns on the
integrated pump.
2.
The control connects 230 VAC to the fan.
The fan does not run at this time.
If the unit is equipped with a low water
cut-off, it must be closed before the
control powers up the fan.
If the unit is equipped with a manual
reset high limit, it must be closed before
the control powers up the fan.
If there is a fan dilution device or similar
connected to the unit, the unit will
provide 24 VAC to its enable relay. If
the fan dilution has a proving switch, it
must be closed before the sequence
continues.
3.
The control starts a 10 second pre-purge
cycle.
4.
Once the pre-purge cycle is complete, and
the blocked drain and auto-reset high limit
are closed, the control starts the 5 second
trial for ignition by sending spark voltage to
the spark electrode and opening the gas
valve.
Содержание EcoShield SHW116-410CE
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