Desa RH10PT - Manual (Page 12)

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TO TURN OFF GAS
TO APPLIANCE
Shutting Off Heater
1. Turn control knob 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 to the
PILOT position.
THERMOSTAT CONTROL
OPERATION
The thermostatic control used on these models
differs from standard thermostats. Standard
thermostats simply turn on and off the burner.
The thermostat used on this heater 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 1 and 5. Selecting the 5
setting will cause the burner to remain fully on
without modulating down in most cases.
Note:
The thermostat sensing bulb measures
the temperature of air near the heater cabinet.
This may not always agree with room tem-
perature (depending on housing construction,
installation location, room size, open air tem-
peratures, etc.). Frequent use of your heater will
let you determine your own comfort levels.
MANUAL LIGHTING
PROCEDURE
1. Remove front panel (see Figure 8, page 7).
2. Follow steps 1 through 7 under Lighting
Instructions, page 11.
3. With control knob pressed in, strike match.
Hold match to pilot until pilot lights.
4. Keep control knob pressed in for 30 seconds
after lighting pilot. After 30 seconds, release
control knob. Now follow step 9, under
Lighting Instructions, page 11.
5. Replace front panel.
OPERATING HEATER
Continued
INSPECTING HEATER
Check pilot flame pattern and burner flame pat-
tern often.
PILOT FLAME PATTERN
Figure 18 shows a correct pilot flame pattern.
Figure 19 shows an incorrect pilot flame pattern.
The incorrect pilot flame is not touching the
thermocouple. This will cause the thermocouple
to cool. When the thermocouple cools, the heater
will shut down.
If pilot flame pattern is incorrect, as shown in
Figure 19
• turn heater off (see To Turn Off Gas to Appliance)
• see Troubleshooting, page 14
Thermocouple
Pilot Burner
Figure 18 - Correct Pilot Flame Pattern
Thermocouple
Pilot Burner
Figure 19 - Incorrect Pilot Flame Pattern
BURNER FLAME PATTERN
Figure 20, page 13, shows a correct burner flame pat-
tern. Figure 21, page 13, shows an incorrect burner
flame pattern. The incorrect burner flame pattern
shows yellow tipping of the flame. It also shows the
flame higher than 1/2 the glass panel height.
WARNING: If yellow tipping
occurs, your heater could pro-
duce increased levels of carbon
monoxide.
NOTICE: Do not mistake orange
flames with yellow tipping. Dirt
or other fine particles enter the
heater and burn causing brief
patches of orange flame.
If burner flame pattern is incorrect, as shown in
Figure 21, page 13
• turn heater off (see To Turn Off Gas to Appliance)
• see Troubleshooting, page 14