VANGUARD
UNVENTED NATURAL GAS LOG HEATER
OPERATING
HEATER
Continued
5.Turn control knob counterclockwise
C-clockwise
Press in control knob for five (5) sec- onds (see Figure 22, page 15). Note: You may be running this heater for the first time after hook- ing up to gas supply. If so, the con- trol knob may need to be pressed in for 30 seconds or less. This will allow air to bleed from the gas system.
•If control knob does not pop out when released, contact a qualified service person or gas supplier for repairs.
6.With control knob pressed in, press and release ignitor button. This will light pilot. The pilot is attached to the front burner. If needed, keep press- ing ignitor button until pilot lights.
Note: If pilot does not stay lit, con- tact a qualified service person or gas supplier for repairs. Until repairs are made, light pilot with match. To light pilot with match, see Manual Light- ing Procedure.
7.Keep control knob pressed in for 30 seconds after lighting pilot. After 30 seconds, release control knob.
Note: If pilot goes out, repeat steps 3 through 7. This heater has a safety interlock system. Wait one (1) minute for system to reset before lighting pilot again.
8.Turn control knob counterclockwise
C-clockwise
CAUTION: Do not try to adjust heating levels by using the manual shutoff valve.
Ignitor Electrode |
|
Thermocouple | Pilot Burner |
|
Figure 23 - Pilot
TO TURN OFF GAS
TO APPLIANCE
Shutting Off Heater
Turn control knob clockwise Clockwise
to the OFF position.
Shutting Off Burners Only (pilot stays lit)
Turn control knob clockwise Clockwise
to the PILOT position.
THERMOSTAT
CONTROL OPERATION
The thermostat control knob can be set to any comfort level between Hi and Lo. The thermostat will gradually modulate the heat output and flame height from higher to lower settings, or pilot, in order to maintain the comfort level you select. The ideal comfort setting will vary by household depending upon the amount of space to be heated, the output of the central heating system, etc.
Note: Selecting the Hi setting with the control knob will cause the burner to remain fully on, without modulating down in most cases.
MANUAL LIGHTING
PROCEDURE
1.Follow steps 1 through 5 under Light- ing Instructions, pages 15 and 16.
2.Depress control knob and light pilot with match.
3.Keep control knob pressed in for 30 seconds after lighting pilot. After 30 seconds, release control knob. Now follow step 8, column 1.
INSPECTING
BURNERS
Check pilot flame pattern and burner flame patterns often.
PILOT FLAME PATTERN
Figure 24 shows a correct pilot flame pat- tern. Figure 25 shows an incorrect pilot flame pattern. (Note: Appearance of pilot assembly may vary by model.) The incor-
rect pilot flame is not touching the thermo- couple. 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 25
•turn heater off (see To Turn Off Gas to Appliance, page 15,
•seeTroubleshooting, pages 18 through 20
Thermocouple
Pilot Burner
Figure 24 - Correct Pilot Flame Pattern
Thermocouple | Pilot Burner |
Figure 25 - Incorrect Pilot Flame Pattern
BURNER PRIMARY AIR HOLES
Air is drawn into the burner through the holes in the fitting at the burner entrance. These holes may become blocked with dust or lint. Periodically inspect these holes for any blockage and clean if needed. Blocked air holes will create soot.
MAIN BURNER
Periodically inspect all burner flame holes with the heater running. All slotted burner flame holes should be open with yellow flame present. All round burner flame holes should be open with a small blue flame present. Some burner flame holes may be- come blocked by debris or rust, with no flame present. If so, turn off heater and let cool. Either remove blockage or replace burner. Blocked burner flame holes will create soot.
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