Shutting Off The Burner; Checking Main Burner Pressure; Check Correct Shape And Size Of Pilot Flame; Checking For Spillage At The Draught Diverter - andrews 24/39 Installation And Service Manual

4 Commissioning
Fig. 24
B
C
Fig. 25
Piezo electrode
and lead assembly
20mm
Pilot burner
20mm
38
A
Plan View
Thermopile
20mm
Front View
Pilot burner
Main burner
4.2.2

Shutting off the burner

For long periods only, (7 days or more) turn control knob to
PILOT, partially depress knob, then turn clockwise to OFF. Turn
off gas service cock. For shorter periods leave heater under
thermostat control.
4.2.3

Checking main burner pressure

1. Turn gas control knob to OFF.
2. Release bleed screw A and connect pressure gauge tube.
3. Light burner as described above.
4. Remove valve cap from port B and adjust pressure using
exposed screw in accordance with data plate.
5. Turn screw clockwise to increase pressure and
counterclockwise to decrease. If possible, check gas rate
See
(see Technical Data) with meter and watch. Refit valve
cap to port B.
6. Turn gas control to PILOT. Remove pressure gauge tube
and tighten bleed screw A.
7. Turn gas control knob to ON and light burner as described
above.
4.2.4

Check correct shape and size of pilot flame

No adjustment is provided for the pilot. The restrictor C on the
gas control (see Fig. 24) should be turned fully counterclockwise
to the fully open position.
When viewed from the front of the heater, the pilot flame should
appear as shown in Fig. 25
4.2.5

Checking for Spillage at the draught diverter

If an extract fan is fitted, carry out a spillage check as set out in
BS 5440 Part 1, Appendix B. If spillage does occur, increase the
ventilation area until the products clear well. If an openable
window is in the boiler house or room containing the heater(s),
turn on the extract fan and heater(s). Open the window fully,
and, using a stiff card, gradually reduce the opening until the
appliance(s) just spills. Then increase the opening until the
products clear well. Measure the opening for the additional area
required.
Issue 2 14/07/16