PROCEDURE 9ÐCIRCULATING PUMP
Every forced hot water system requires a circulating pump. A separate pump or zone valve is required for each zone if there are 2 or more zones. This pump must have the capacity to provide circulation required by system. The pump is connected into return main just ahead of boiler and wired to electrical system.
PROCEDURE 10ÐBLOWER (DRAFT INDUCER)
The blower provides a means for pulling air through boiler and exhausting flue gases into vent system. The blower shuts off when burners are not firing. This keeps heat in the house rather than losing it up the chimney.
PROCEDURE 11ÐPRESSURE SWITCH
The air pressure switch works on a negative pressure. When blower comes on, the air pressure switch operates intermittent pilot and gas valve. The air pressure switch is factory set and only works when blower operates properly. It prevents boiler from starting if blower does not generate enough pressure or if venting system is blocked.
The
PROCEDURE 12ÐROLLOUT SWITCH (FLAME ROLLOUT SAFETY SHUTOFF)
The rollout switch is a
If rollout switch blows, it must be replaced with an exact replacement. Check heat exchanger flueways for blockage when restoring system to operating condition. Do not operate system without a rollout switch.
STARTING BOILER
PROCEDURE 1ÐHOW A HOT WATER SYSTEM OPERATES
The entire heating system (boiler, piping, and radiation units) is filled with water. As water in boiler is heated, it is pumped from top of boiler through supply main to radiation units. The cooler water in them flows back through return main to boiler. This provides positive and rapid response to thermostat.
PROCEDURE 2ÐFILLING SYSTEM WITH WATER
To fill:
1.Close air vents on all radiation units. Open valves to these units.
2.Make sure boiler and expansion tank drain cocks are closed. The air bleed screw on tank drain fitting should be closed.
3.Open valve in line from boiler to expansion tank. Refer to Maintaining Boiler section for additional information.
4.Open water inlet to boiler and leave it open.
5.Start with LOWEST radiation unit. Open air vent on this unit. When all air has escaped and water starts to flow from vent, close air vent.
6.Proceed to next lowest radiation unit and repeat process outlined in item 5. Repeat until every radiation unit in system has been covered. End with highest unit in system. If units have automatic vents, this manual venting is unnecessary but speeds up proper filling of system.
If system is a closed expansion tank system, there may be an automatic fill valve. It may be left open to refill system automatically as needed. Check
CAUTION: Never run water into a hot, empty boiler.
FOR YOUR SAFETY READ BEFORE OPERATING
WARNING: If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury, or loss of life.
This appliance is equipped with an ignition device which automatically lights burner. Do NOT try to light burner by hand.
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