Vanguard Heating VMH26TPB - Manual (Page 18)

111043-01A
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18
TO TURN OFF GAS
TO APPLIANCE
The thermostatic control used on this fireplace differs from
standard thermostats. Standard thermostats simply turn on and
off the burner. The thermostat used on this fireplace senses the
room temperature. The thermostat adjusts the amount of gas
flow to the burner. This increases or decreases the burner flame
height. At times the room may exceed the set temperature. If so,
the burner will shut off. The burner will cycle back on when room
temperature drops below the set temperature.
The control knob can be set to any heat level between HI and LO.
Note: The thermostat sensing bulb measures the temperature
of air near the fireplace cabinet. This may not always agree with
room temperature (depending on housing construction, instal-
lation location, room size, open air temperatures, etc.). Fre-
quent use of your fireplace will let you determine your own
comfort levels.
Shutting Off Fireplace
1. Turn control knob clockwise
Clockwise
to the OFF position.
2. Turn off all electric power to the appliance if service is to
be performed.
Shutting Off Burner Only (pilot stays lit)
Turn control knob clockwise
Clockwise
to the PILOT position.
THERMOSTAT
CONTROL OPERATION
1. Follow steps 1 through 5 under Lighting Instructions, page 17.
2. With control knob pressed in, strike match. Hold match to
pilot until pilot lights.
3. Keep control knob pressed in for 30 seconds after lighting
pilot. After 30 seconds, release control knob. Now follow
step 8, page 17.
MANUAL LIGHTING
PROCEDURE
OPERATING FIREPLACE
Continued
OPERATING
BLOWER
OF F
ON
Auto/Off/On
Switch
This blower has three settings: ON, OFF, and AUTO. In the ON
position, the blower will operate constantly. In the OFF posi-
tion, the blower will not operate. In the AUTO position, the
blower will start when the thermostat senses a sufficient in-
crease in firebox temperature.
Figure 32 - Auto/Off/On Switch
INSPECTING BURNER
Thermocouple
Pilot Burner
Figure 33 - Correct Pilot
Flame Pattern (Propane/LP
Shown)
Thermocouple
Pilot Burner
Figure 34 - Incorrect Pilot
Flame Pattern (Propane/LP
Shown)
Check pilot flame pattern and burner flame pattern often.
PILOT FLAME PATTERN
Figure 33 shows a correct pilot flame pattern. Figure 34 shows an
incorrect pilot flame pattern. The incorrect pilot flame is not properly
heating the thermocouple. This will cause the thermocouple to cool.
When the thermocouple cools, the fireplace will shut down.
If pilot flame pattern is incorrect, as shown in Figure 34
• turn fireplace off (see To Turn Off Gas to Appliance)
• see Troubleshooting, pages 20 through 22
Note: The pilot flame on natural gas units will have a slight curve,
but flame should be blue and have no yellow or orange color.
Note: Your fireplace and thermostat blower will not turn on
and off at the same time. The fireplace may run for several
minutes before the blower turns on. After the heater modulates
to the pilot position, the blower will continue to run. The blower
will shut off after the firebox temperature decreases.
Note: It is safe to operate fireplace with blower turned off.
However, the blower helps distribute heated air from the fireplace.
OPERATING FIREPLACE
To Turn Off Gas To Appliance
Thermostat Control Operation
Manual Lighting Procedure
Operating Blower
INSPECTING BURNER
Pilot Flame Pattern