Shutting Off The Burner; Checking Main Burner Pressure; Checking Pilot And Burner Flames - andrews CSC 39 Installation Manual, Operation And Service Manual

SECTION 4
Fig 13.
26
COMMISSIONING

Shutting Off The Burner

1. For long periods only, (7 days or more) move electrical ON/OFF switch to OFF, then
turn gas control knob to OFF. Turn off gas service cock. For shorter periods, leave
heater under thermostat control.
Gas control
Knob

Checking Main Burner Pressure

1. Turn gas control knob to OFF.
2. Release bleed screw (A) and connect pressure gauge tube to port (A).
3. Light burner as described previously.
4. Remove valve cap from port (B) and adjust pressure using exposed screw in
accordance with data plate. Turn screw clockwise to increase pressure and
counterclockwise to decrease. If possible, check gas rate (see Technical Data) with
meter and watch. Refit valve cap to port (B).
5. Turn gas control to OFF. Remove pressure gauge tube and tighten bleed screw (A).
6. Turn gas control knob to ON and light burner as described above.
Checking Pilot and Burner Flame
1. Visually check that pilot and burner flames are burning properly.
2. The main burner and pilot flame may be viewed through the viewing window on the
front of the combustion air box.
3. Adjustment to the air shutter setting is not normally required for the heater.
4. Some LPG models may be factory pre-set with the burner air shutters closed most of
the way.
5. The burner flames should be blue with yellow tips.
6. A blue/orange flame is characteristic of LPG operation.
If the burners resonate (produce an harmonic noise and vibration, usually with LPG gas),
close down the burner air shutters until the resonance stops. The resonance during
burner operation should only be checked with the front panel held in place, since
resonance may be more pronounced with the front panel off. Ensure flame appearance
is satisfactory after adjusting the burner air shutters as described above.
IMPORTANT! IN THE EVENT OF AN EMERGENCY, TURN OFF GAS AND
ELECTRIC SUPPLY.
B
A