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Thermostat actuates on call for heat,
completing circuit to control. Completed
circuit to control will first activate circulator
and damper which will close end switch inside
damper. Completes circuit to ignition system,
ignition takes place.
In event boiler water temperature exceeds
high limit setting on boiler mounted high limit
control, power is interrupted between control
system and ignition system. Power remains
off until boiler water temperature drops below
high limit setting. Circulator continues to
operate under this condition until thermostat is
satisfied.
In event flow of combustion products through
boiler venting system becomes blocked, blocked
vent safety switch shuts main burner gas off.
Similarly, if boiler flue-way becomes blocked,
flame rollout safety switch shuts main burner
gas off. Figure 16. If either of these conditions
occur, DO NOT ATTEMPT TO PLACE BOILER
BACK INTO OPERATION. CONTACT
CERTIFIED SERVICE AGENCY.
Before seasonal start-up, have a certified service agency
check boiler for soot and scale in flues, clean burners and
check gas input rate to maintain high operating efficiency.
!
WARNING
Label all wires prior to disconnection when servicing
controls. Wiring errors could cause improper and
dangerous operation.
Verify proper operation after servicing
Service agency will verify system is filled with water to
minimum pressure and open air vents, if used, to expel any
air accumulated in the system. Check entire piping system
and, if any leaks appear, have them repaired.
Circulators need to be checked and maintained.
Refer to circulator manufacturer's instructions.
Inspect venting system at the start of each heating
season. Check vent pipe from boiler to chimney for signs of
deterioration by rust or sagging joints. Repair if necessary.
Remove vent pipe at base of chimney or flue and using a
mirror, check vent for obstruction and verify vent is in good
working order.
Boiler flue gas passageways may be inspected by a light
and mirror. Remove burner door. Figure 17. Place trouble
lamp in flue collector through draft relief opening. With
mirror positioned above burners, flue gas passageways can
be checked for soot or scale.
12 - NORMAL SEQUENCE OF OPERATION
Intergral Draft
Hood
Burner
Door
Burners
Orifices
13 - GENERAL INSTRUCTIONS
Figure 17 - Blocked Vent Safety Switch, Roll-out
Safety Switch
This procedure should be followed to clean flue gas
passageways:
1.
Remove burners from combustion chamber by raising
burners up from manifold orifices and pulling toward
front of boiler. Figure 19.
2.
Disconnect vent pipe from draft hood.
3.
Remove top jacket panel.
4.
Remove combination flue collector and draft hood from
boiler castings by loosening nuts on hold down bolts
located on each side of collector. Figure 17.
5.
Place sheet of heavy paper or similar material over
bottom of base and brush down flue passageways. Soot
and scale will collect on paper and is easily removed
with the paper.
6.
With paper still in place in base, clean top of boiler
castings of boiler putty or silicone used to seal between
castings and flue collector. Verify chips are not lodged
in flue passageways.
When cleaning process is complete, restore boiler
components to their original position. Use IS-808 GE
silicone (available from distributor) to seal around flue
collector and boiler castings.
21
Blocked Vent
Safety Switch
Rollout Switch
4 Section Boiler
Rollout Switch
Base
2,3,5
Jacket Base
Section Boiler
Panel
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