Weil-McLain CGA25SPDN manual 8a Operation - standing pilot boilers

GOLD CGa Gas-Fired Water Boiler — Boiler Manual

8a Operation — standing pilot boilers

Follow all procedures given in this manual and light- ing instructions when operating the boiler. Failure to do so could result in severe personal injury, death or substantial property damage.

1.3TANDBYYMODE After pilot is manually lit, the gas valve provides pilot gas and maintains pilot as long as the thermocouple is satisfied. If ther- mocouple signal drops for any reason, pilot must be manually lighted, following the ,IGHTING )NSTRUCTIONS IN THIS MANUAL ANDNON BOILERL6ENT damper will remain closed.

2.#ALL FOR HEAT When thermostat circuit closes, the boiler circulator and vent damper are energized. The vent damper drives open. When the vent damper is fully open, its end switch energizes the main gas valve.

4HIS PROVIDESRGASVTO THE MAINGBURNERS "URNERS RE-

main ignited until thermostat circuit or limit circuit

OPENS "URNERSNANDNCIRCULATOR ARERDEENERGIZED WHEN CALL FOROHEAT STOPS "URNERSNARERDEENERGIZEDRBUTU circulator remains on, if the limit circuit opens.

3.,IMITMOPERATION When a limit control opens, the main gas valve is de-energized, but circulator con- tinues to run. When the limit circuit closes again, the main gas valve is energized if there is still a call for heat.

4.4HERMOSTAT HEAT ANTICIPATOR Set heat anticipator as shown on wiring diagram, &IGURE .

Figure 23 Wiring diagram — Standing pilot system

34 Part Number 550-101-009/0107