Raypak 751 Operations Instructions download pdf (Page 45)

Ignition Control Module

The intermittent ignition device conserves energy by

automatically extinguishing the pilot when the desired

temperature is reached. When additional heat is need-

ed, the combustion air blower starts to purge all air

from the combustion chamber for about 45 seconds.

On proof of air flow, the air proving switch closes and

the pilot reignites electrically, eliminating the fuel costs

of maintaining a constant pilot.

To ensure safe operation, the gas valve cannot open

until the pilot relights and is verified. The 100% pilot

safety is an electronic device which closes the main

gas valve within 8/10 of a second whenever the pilot

flame is interrupted. Pilot flame is automatically lit

when the device is powered and pre-purged. Unit per-

forms its own safety check and opens the main valve

only after the pilot is proven to be lit.

High Limit — Manual Reset

This appliance is equipped with a manual reset, high

limit, safety device. Push the reset button and adjust

the setting to 40°F above the desired operating tem-

perature.

Flow Switch

Dual-purpose control shuts off boiler in case of pump

failure or low water condition. Mounted and wired in

series with the main gas valve. Check with the manu-

facturer for proper paddle size. Utilize correct paddle

size for proper operation.

High Limit — Auto Reset

This appliance is equipped with an automatic, high

limit, safety device. Set the auto high limit to 30°F

above the desired operating temperature.

Fig. 31: Ignition Module

Fig. 32: High Limit — Manual Reset

NOTE: Flow switch will not operate if flow is less

than 20 gpm.

Fig. 33: Flow Switch

Fig. 34: Auto Reset — High Limit

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Raypak 751 Operations Instructions Page 45