Operating instructions

PROCEDURE 6—SAFETY CONTROLS CHECK
After setting limit control to desired setting, check to see if it shuts off gas supply to burners. Turn thermostat to call for heat and let boiler run
until temperature of water reaches limit setting. Gas valve should shut off and circulator should keep running until thermostat is satisfied or water
cools enough to restart burners through limit control.
To check operation of contacts in pressure switch, disconnect rubber tubing (located between blower and pressure switch) from pressure switch
while boiler is operating. The burners should extinguish, and blower should keep running. When tubing is reconnected to pressure switch, ignition
sequence should begin, resulting in ignition of main burners.
Finally, set thermostat for desired temperature. Special conditions in home and location of thermostat govern this setting.
Safe lighting and other performance criteria were met with gas manifold and control assembly provided on boiler when boiler underwent tests
specified in ANSI Z21.13-latest revision.
MAINTAINING BOILER
PROCEDURE 1—BURNERS
A visual check of pilot and main burner flames should be made at least once each year, preferably at beginning of heating season. See Checking
and Adjusting section and Fig. 12, 13, and 14. Main burner flame should form a sharp blue cone with no yellow.
PROCEDURE 2—RELIEF VALVE
This valve should open automatically when system pressure exceeds safe limit (30 psi). Should it ever fail to open under this condition, shut down
system. Drain it until pressure is reduced below safe limit. Have valve replaced immediately.
PROCEDURE 3—EXPANSION TANK
As previously noted, this tank may become waterlogged or may receive an excess of air. Frequent automatic opening of relief valve indicates
waterlogging. A high boiler temperature accompanied by unusually low radiation unit temperature (and "knocking") indicates excess air in tank.
To correct either condition, close valve between boiler and tank. Drain tank until it is empty. Check all tank plugs and fittings. Tighten as necessary.
Open valve between boiler and tank. Water will rise to normal height in tank if automatic fill valve is installed, otherwise, manually refill system.
PROCEDURE 4—BOILER FLUE PASSAGES
Under normal operating conditions with burners properly adjusted, it should not be necessary to clean boiler flue gas passages. However, to assure
trouble-free operation, we recommend that flue passages, burner adjustment, and operation of controls be checked ONCE EACH YEAR by a
competent service technician.
BEFORE THE START OF EACH SEASON (or whenever system has been shut down for some time), recheck whole system for leaks and recheck
boiler and vent pipe for leaks. Replace or patch any boiler seals that are faulty.
PROCEDURE 5—VENT PIPE
The venting of this unit is very important. Piping should be checked at least once a month. If vent piping shows any signs of leaking, replace it
immediately.
PROCEDURE 6—WATER SYSTEM
If system is to remain out of service during freezing weather, always DRAIN IT completely. Water left in to freeze will crack pipes and/or boiler.
Fig. 14—Main Burner Flame
A95159
OUTER CONE DARKER BLUE
INNER
CONE
BLUE
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