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!
WARNING
Burn Hazard. View port on burner door may be hot.
Wear personal protection when servicing this boiler.
!
WARNING
Fire and Asphyxiation hazard. Do not attempt to
place boiler in operation if safety switches shut the
main burner gas off. Contact a qualified service
agency. Failure to follow these instructions could
result in death or serious injury.
13.1 General
1.
Thermostat actuates on call for heat, completing circuit
to control.
A. Completed circuit to control will energize the vent
damper. The circulator will be energized if the boiler
water temperature is above 125°F
B. When the vent damper is fully open the damper
end switch completes the circuit to ignition system,
ignition takes place.
2.
In event boiler water temperature exceeds high limit
setting on boiler mounted high limit control, power
is interrupted between control system and ignition
system.
Figure 13-1 Blocked Vent Safety Switch, Roll-out
Safety Switch
Flue
Inspection
Cover
Risedeo
Control
Transformer
Low Water
Cutoff
Burner
Door
Burner
View Port
Igniter
Burners
13 - NORMAL SEQUENCE OF OPERATION
Gas Valve
A. Power remains off until boiler water temperature
drops below high limit setting.
B. Circulator continues to operate under this condition
until thermostat is satisfied.
3.
In event the flow of combustion products through boiler
venting system becomes blocked:
A. Blocked vent safety switch shuts main burner gas
off.
B. If boiler flue-way becomes blocked: flame rollout
safety switch shuts main burner gas off. See Figure
13-1.
If either of these conditions A or B exist:
Do not attempt to place boiler back into operation.
Contact certified service agency. Do not jumper
safety switch(s).
For detailed sequence of control, see Appendix A
Base
29
Blocked Vent
Safety Switch
Rollout Switch
PN 240012809, Rev. D [08/15/2021]
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