Troubleshooting; Uvs27R/Honeywell Control Valve Assembly; Uvs27M/Sit Control Valve Assembly - Vermont Castings UVS27R Owner's Manual

W A R N I N G
TURN OFF HEATER AND ALLOW TO COOL
COMPLETELY BEFORE SERVICING.
Follow these procedures in the order presented.
CONDITION
No spark at pilot when Ignitor is
operated.
The Ignitor Electrode sparks,
but Pilot does not light.
Pilot /Main Control
Fig. 30 UVS27R/Honeywell Control Valve Assembly.

Troubleshooting

POSSIBLE CAUSE
1. Ignition Electrode is discon-
nected from ignition wire,
broken or incorrectly positioned.
2. Ignitor wire is broken.
3. Bad Piezo Ignitor.
1. Gas supply is turned off or supply
line shut-off valve is closed.
2. Control Knob is not in PILOT
position.
3. Control Knob not pressed in while
in PILOT position.
4. Air present in gas lines.
5. Inlet supply pressure is not within
correct settings.
6. Other conditions that should be
identified only by a qualified gas
technician.
Piezo Ignitor
OFF
1. Inspect and re-connect, replace
2. Replace wire.
3. Replace Piezo Ignitor.
1. Turn on gas supply or open
2. Turn Control Knob to PILOT.
3. Press Control Knob in while in
4. Continue holding in Control
5. Call local gas supplier. Adjust
6. Call qualified gas technician.
Regulator
ST120
Fig. 31 UVS27M/SIT Control Valve Assembly
Vermont Castings UVS27
SOLUTION
or repair as necessary.
supply line shut-off valve.
the PILOT position.
Knob and repeat ignition
procedure until air is bled from
the lines.
inlet supply pressure to specifi-
cation: NG; 5" W.C.-
8"W.C.(5"w.c.-7"w.c. at eleva-
tions over 8000 ft.). LP; 11"
w.c.-12"w.c.
Piezo Ignitor
Pilot/Main Control
PILOT
ST120
17
m