FULTON PHW 1000, Installation, Operation And Maintenance Manual

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Fulton Heating Solutions, Inc. -- PHW Manual -- 2010-0713
Page 32
16. Sequence of Operation
a) Turn on main breaker.
b) Low water safety relay (LWSR) is energized when the main breaker is turned on. Red
light on the boiler panel is lit and if the optional alarm is provided, alarm will go off.
Current is not allowed to pass to the high limit temperature control until both the probe in
the boiler shell senses the water and the manual reset switch is reset. If conditions are
both satisfied, the red light is turned off.
c) Burner switch is then closed to energize the operating temperature control. (Green light
on the panel is lit).
d) The Temperature Control allows current to pass to the High Temperature Control Circuit
if the temperature control senses a “Call for Heat”.
e) High limit temperature control allows current to pass to the next control if the temperature
in the boiler water is not causing the control to open the circuit.
f) The Condensate Sensing Relay allows current to pass to the Blocked Exhaust Switch,
Low Gas Pressure and High Gas Pressure Switch.
g) If all of the safeties/limits are made, the Flame Programmer starts the Purge Fan.
h) Purge fan switch is made, signaling the control to proceed. Purge Fan runs for 35
seconds.
i) Spark plug is energized.
j) Gas valve is energized.
k) Flame sensing is proven allowing sequence to continue. Purge Fan shuts off.
l) Pulse combustion process will continue until temperature control is satisfied.