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IGNITER WARM-UP AND PROVING
(Ignition Module Function)
Once the ignition module has completed its prepurge period, it
turns on the hot surface igniter. Once the hot surface igniter’s
current draw reaches a proper level, the ignition module begins an
additional period of approximately 25 seconds for the igniter to
ensure the ignition temperature is attained to ignite the fuel/air
mixture.
IGNITER
(Controlled by Ignition Module)
One igniter is provided in order to ignite the fuel/air mixture and its
operation and timings are controlled by the ignition module.
IGNITION AND FLAME PROVING
(Ignition Module Function)
Once the warm-up and proving period has been completed, the
ignition module sends 24VAC to the gas valves on approximately
half of the pool heater. These gas valves should open and allow gas
to flow to the burners. The fuel/air mixture should ignite from the
hot surface igniter. Once this voltage has been sent to the valves,
the hot surface igniter is turned “OFF”. The ignition module then
monitors and proves the presence of the flame and will either allow
operation to continue or shut down the gas valves should flame not
be proven and proceed to a Flame Failure condition. If flame was
proven briefly during the ignition period, the module may not
proceed to Flame Failure, but rather post-purge and then go into
another trial for ignition.
SOFT-START
MODELS 990,000 - 2,070,000 BTU/HR ONLY
(Controlled by Temperature Controller)
A small time delay is provided to delay the opening of
approximately half of the valves until the first half of the valves have
opened and the gas has successfully ignited and established flame on
the burners.
Installation and Service Manual
HEAT TRANSFER PROCESS
(Gas Valves, Burner and Heat Exchanger)
Once flame has been proven, the ignition module will hold the gas
valves open as long as there is proof of flame and a call for heat is
present. When the temperature of the water reaches that of the
programmed set point, the pool heater will be shut down.
POST-PURGE
(Ignition Module Function)
When 24VAC is removed from the ignition module’s thermostat
input, the module turns “OFF” the gas valves and maintains the
blowers for approximately 25 seconds in order to allow the
combustion chamber to be purged of all combustion by-products.
IDLE
(Temperature Controller Function)
After completion of the post-purge cycle, the pool heater will go
into an idle state whereby the temperature controller continuously
monitors the water temperature until the water temperature drops
to levels that require additional heat.