Vermont Castings UVS27R Owner's Manual page 18

Vermont Castings UVS27
Troubleshooting cont'd.
CONDITION
Pilot lights but flame goes out
when Control Knob is released.
Fig. 32 Pilot flame is lifting.
Thermocouple
Fig. 33 Pilot flame is weak -
does not touch Thermocouple.
Fig. 34 Correct LP Pilot Flame -
UVS27M shown
Pilot lights but Main Burner
does not.
Main Burner shuts off and Pilot
flame goes out while in opera-
tion.
18
POSSIBLE CAUSE
1. Control Knob not fully de-
pressed or held in long enough.
2. Gas supply line shut-off valve is
not fully open.
3. Thermocouple connection is
loose at the Control Valve.
4. Pilot flame does not touch the
Thermocouple. (Figs. 31, 32)
This can be caused by:
A) Incorrect gas pressure, and/
or
B) other conditions that should
be identified only by a qualified
service technician.
5. Thermocouple is damaged.
6. Control Valve is damaged.
Fig. 35 Correct NG Pilot Flame -
UVS27R shown.
1. Gas supply line shut-off valve is
not fully open.
2. Foreign material is blocking
Burner ports.
3. Main Burner orifice is clogged.
4. Thermostat or remote switch
not activated on UVS27R.
5. Bad Thermocouple.
1. Insufficient fresh air.
2. Incorrect inlet supply pressure.
SOLUTION
1. Depress Control Knob fully and
hold in for a full 30 seconds.
2. Fully open gas supply line shut-
off valve.
3. Inspect and tighten securely.
4. A) Contact the local gas
company. Inlet supply pressure
should be 5" w.c.-8"w.c. for NG
(5"w.c.-7"w.c. over 8000 ft.
elevation) and 11"w.c.-12"w.c.
for LP. Adjust as necessary.
B)Call local gas service techni-
cian.
5. Call local gas service techni-
cian.
6. Call local gas service techni-
cian.
1. Fully open gas supply line shut-
off valve.
2. Insptect and clear debris away
from Burner ports.
3. Call local gas service techni-
cian.
4. Set thermostat to higher tem-
perature or check remote
switch.
5. Call local gas service techni-
cian.
1. Determine that adequate
ventilation exists to provide
sufficient fresh air. Open a
window or provide additional
ventilation. (See Fresh Air
Requirements, Pages 6-7)
2. Contact the local gas company.
Adjust inlet supply pressure to
specification: 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.