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PWX WITH
STANDING
PILOT:
Thermostat
calls for heat, completing
the circuit
to the aquastat
and gas valve. The sequence
is as follows:
The
LED light indicating
a call for heat and circulator,
in the control panel, will illuminate.
The automatic
vent damper
will begin to open. When the vent damper
is completely
open and the end switches
are made, the gas valve /
burner LED light will illuminate
and the main valve will open, lighting
all the burners.
The burners will continue
to
fire until either
the thermostat
or high limit, in the aquastat,
is satisfied.
If the high limit is satisfied
and a call for
heat remains from the thermostat,
the main valve will close, shutting
off gas supply to the burners
and the
associated
LED light in the control
panel. The circulator
will continue
to operate
and circulator
LED light will
remain on until the thermostat
is satisfied.
Please note the main power
LED light, in the control
panel, will remain on until line voltage to the boiler is turned
off or disconnected.
1.
2,
3,
INITIAL
SERVICE
CHECKS
BEFORE TROUBLESHOOTING:
A.
MAKE SURE THAT CIRCUIT
BREAKER IS ON OR FUSE IS OK AT ELECTRICAL PANEL.
B.
MAKE SURE THAT SERVICE SWITCH
IS ON.
C.
MAKE SURE THAT GAS IS ON AT THE GAS METER, AND THAT ALL APPROPRIATE
MANUAL
SHUTOFF VALVES AND GAS CONTROL VALVE ARE OPEN.
D.
MAKE SURE THAT THE THERMOSTAT
IS CALLING FOR HEAT.
E.
CHECK THAT WIRE CONNECTORS
AT THE L7148F CONTROL, TRANSFORMER
AND $8600 CONTROL
(IF USED) ARE SECURELY PLUGGED IN OR CONNECTED.
TROUBLESHOOTING TOOLS:
A.
VOLTMETER TO CHECK 120 VAC AND 24 VAC.
B.
CONTINUITY TESTER.
C.
U-TUBE MANOMETER OR DIFFERENTIAL PRESSUREGAUGE WITH 0-14" RANGE (0.1" SCALE) FOR
MEASURING INLET AND MANIFOLD GAS PRESSURES.
WHAT IS SYSTEM STATUS ?
A.
CONSULT THE CHART ON THE FOLLOWING
PAGE.
B.
FIGURE 19 ON PAGE 25 SHOWS THE LOCATION
ON THE BOILER OF THE SYSTEM STATUS LIGHTS.
24
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