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Basic Operation
Service on this boiler should be undertaken only by trained and skilled personnel from a
qualified service agency.
Should overheating occur or the gas supply fail to shut off, do not turn off or disconnect the
electrical supply to the pump. Instead, shut off the gas supply at a location external to the
appliance.
Do not use this boiler if any part has been under water. Immediately call a qualified service
agency to inspect the boiler and to replace any part of the control system and any gas control
which has been under water.
A. General. This water boiler is a natural draft appliance and is equipped with controls for proper
operation. All controls must be in proper working order. Contact a qualified service agency to provide
annual maintenance as specified in Installation, Operation and Maintenance Manual.
1. Limit. See Figure 1. A device which automatically interrupts boiler operation when the water
temperature exceeds the set point. Maximum allowable temperature is 240°F (115°C).
Original equipment with this boiler is a Honeywell L8148E1182. Boiler operation is interrupted
when system temperature reaches cut-out temperature. Boiler operation resumes automatically
when system temperature falls approximately 15°F (8°C) below the cut-out temperature. See also
Figures 4 and 5 for limit sequence of operation.
2. Flame Rollout Switch. See Figure 1. A device which automatically interrupts boiler operation
when flames or excessive heat are present in the combustion area. The control is a single use
device. If the control is activated to interrupt boiler operation, do not attempt to place boiler in
operation. Contact a qualified service agency.
3. Blocked Vent Switch (Vent Safety Shutoff Switch). See Figure 1. A device which automatically
interrupts boiler operation when there is a blockage in the vent pipe or chimney. The control is a
manual reset device. The control is located on the draft hood relief opening. If the control was
activated to interrupt boiler operation, do not attempt to place boiler in operation. Contact a
qualified service agency.
4. Pilot. The pilot provides the ignition source for the main burners. Your boiler has a standing
(continuous) pilot or an intermittent pilot. The intermittent pilot ignites only when there is a call for
heat and extinguishes when the call for heat ends. See Figures 6 and 7.
5. Gas Valve. The gas valve monitors pilot flame and regulates gas flow to the burners and pilot. See
Figure 1.
6. Safety Relief Valve. A device which protects the boiler against excessive pressure. The safety
relief valve can discharge a large amount of hot water - the installer should provide piping to
discharge water near floor at a floor drain. If the safety relief valve discharges water, follow
instructions TO TURN OFF GAS TO APPLIANCE (see Figure 2 or 3), and contact a qualified
service agency.
WARNING
CAUTION
2
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