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PAGE 2
BASIC OPERATION
WARNING
Service on this boiler should be undertaken
only by trained and skilled personnel from a
qualified service agency.
CAUTION
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 an induced 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 automati-
cally interrupts boiler operation when the water
temperature exceeds the set point. Maximum
allowable temperature is 220°F (104°C).
Original equipment with this boiler is a
Honeywell L4080B1253. 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.
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. Pressure Switch. See Figure 1. A device which
automatically interrupts boiler operation when
there is excessive blockage in the vent system
or fan motor does not operate. This control is an
automatic reset device. If control is activated to
interrupt boiler operation, do not attempt to
place boiler in operation. Contact a qualified
service agency.
HVX USER'S INFORMATION MANUAL
4. Pilot. The pilot provides the ignition source for
the main burners. Your boiler has an intermittent
pilot. The intermittent pilot ignites only when
there is a call for heat and extinguishes when
the call for heat ends. See Figure 5.
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 safe-
ty relief valve can discharge a large amount of
hot water - the installer should provide piping
to discharge water near floor at a floor drain.
See Figures 2 and 3. If the safety relief valve
discharges water, follow instructions TO TURN
OFF GAS TO APPLIANCE (see Figure 4), and
contact a qualified service agency.
B. Instructions to place boiler in operation and to turn
off the boiler are shown on the Operating Instruction
Label posted on the inner jacket panel of the boiler.
The instructions are also shown in Figure 4.
C. Sequence of Operation.
1. Thermostat calls for heat, energizes circulator.
2. Limit senses boiler water temperature. Prevents
operation until water temperature falls approxi-
mately 15°F (8°C) below the cut-out tempera-
ture.
3. Fan energizes.
4. Gas valve energizes.
a. Igniter on.
b. Pilot gas on, igniting pilot.
5. Pilot flame detected.
a. Igniter off.
b. Main gas on, igniting main burners.
Note: If pilot flame is not detected within 30
seconds, the igniter is turned off for 30 seconds,
and then turned back on. If the pilot is not
detected within 30 seconds, the igniter and pilot
gas are turned off for 5 minutes. The sequence
then resumes at Step 4a.
6. Call for heat ends.
Pilot and main gas off, extinguishing pilot and
main burners.
If this sequence is not followed exactly, follow
instructions TO TURN OFF GAS TO APPLIANCE
(see Figure 4) and contact a qualified service
agency.
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