Raypak 302-902 Installation And Operating Instructions Manual page 47

IGNITION CONTROL MODULE
The interrupted proved ignition device conserves energy. When additional heat
is needed, the combustion air blower starts to purge all air from the combustion
chamber for about 15 seconds. On proof of air flow, the air proving switch closes
and the igniter is energized, eliminating the fuel costs of maintaining a constant
pilot. To assure safe operation, the gas valve cannot open until the pilot igniter is
verified. The 100% igniter safety is an electronic device which closes the main gas
valve within 8/10 of a second whenever the flame is interrupted. Main burner is
automatically lit when the device is powered and pre-purged. Unit performs its
own safety check and opens the main valve only after the igniter is proven to be
capable of ignition.
HIGH LIMIT (MANUAL RESET)
The boiler is equipped with a manual reset high limit temperature device. Push the
reset button and adjust the setting to 30° F or 40° F above desired operating
temperature.
FLOW SWITCH
Dual-purpose control shuts off boiler in case of pump failure or low water flow.
Mounted and wired in series with the main gas valve. Check with Manufacturer for
proper paddle size. Utilize correct paddle size for proper operation.
NOTICE: Flow switch will not operate if flow is less than 20 GPM.
OPERATING CONTROL
The heater may be equipped with different types of operating controls. Consult
data sheet supplied with installation instructions. See Section L for adjustment
safety precautions on domestic hot water applications.
Drw. #8644
Drw. #8241
47
IGNITION MODULE
MANUAL RESET HIGH LIMIT
FLOW SWITCH
Drw. #8643
THERMOSTAT CONTROL
Fig #9322
Fig. J-3
Fig. J-4