Operating Your Boiler - Dunkirk PWXL Installation, Operation & Maintenance Manual

Automatic Gas Valve
The Automatic Gas Valve opens or closes according to the
heat requirements of the thermostat and temperature limit
control. It closes if the pilot goes out. Each individual con-
trol must be operating correctly before any gas can pass to
the burners. Any one control can hold the gas supply from
burner regardless of the demand of any other control.
Safety Pilot
Safety Pilot prevents the fl ow of gas to burner if the pilot
goes out, or will not ignite.
Ignition System Safety Shutdown Test
1. For boilers equipped with continuous pilot, with main
burners fi ring, disconnect the thermocouple from the gas
valve. The gas valve should immediately shut off the main
burners and the pilot.
2. For boilers equipped with intermittent ignition, with main
burners fi ring, disconnect the ignition cable from the inter-
mittent pilot control box. The gas valve should shut off the
main burners.
TURN OFF ELECTRIC POWER to boiler before reconnecting
ignition cable, to prevent electric shock.
Relight
The electric and gas shall be off for 5 minutes before re-
lighting.
Safe lighting and other performance criteria were met with
the gas manifold and control assembly provided on the
boiler when the boiler underwent tests specifi ed in ANSI
Z21.13 - latest revision.
Thermostat
Keep it set at a desired room temperature. If windows
are to be opened or heat is not needed, move thermostat
pointer to a lower setting.
In event of failure of any component, system
will not operate or will go into safety lockout.
System is completely self-checking. On
every call for heat, each component must
be functioning properly to permit operation.
On safety lockout system has to be reset by
turning thermostat to lowest setting for one
minute, then back to normal setting.

OPERATING YOUR BOILER

NOTICE
Figure 19- Lighting the Pilot
Figure 20- Burner Flame
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