Glow-worm Swift flow 100 Installation Instructions Manual page 24

11.6 Gas Rate - Modulation - SIT
The minimum gas rate is factory preset and no
adjustment should be required.
ALWAYS CHECK THE HOT WATER BURNER
PRESSURE FIRST - REFER TO SECTION 11.5.
To check the minimum gas rate, first make sure that the
boiler is isolated from the electrical supply at the
external isolator. Disconnect one of the electrical
connectors, grey, from the modulator, see diagram 11.2.
INSULATE THE CONNECTOR TO MAKE SURE
THAT IT DOES NOT CONTACT ANY METALLIC
PARTS.
Switch on the electrical supply.
Fully open a hot water draw off tap and the main burner
will light at the minimum gas rate.
Check that the burner pressure is 0.1kPa. If this is
incorrect, it may be adjusted by turning the centre, white
adjuster screw of the modulator, anti-clockwise to
decrease, whilst at the same time stopping the larger
brass nut from turning, see diagram 11.2.
Isolate the boiler from the electrical supply then
reconnect the modulator cable and refit the cap.
221017B
1 1 C o m m i s s i o n i n g
11.6 Gas Rate Modulation - Honeywell
The minimum gas rate is factory preset and no
adjustment should be required.
ALWAYS CHECK HOT WATER BURNER
PRESSURE FIRST - REFER TO SECTION 11.5.
To check the minimum gas rate, first make sure that the
boiler is isolated from the electrical supply at the
external isolator. Disconnect one of the electrical
connectors (grey), from the modulator, see diagram 11.3.
Insulate the connector to make sure that it does not
contact any metallic part of the boiler.
Switch on the electrical supply.
Fully open a hot water draw off tap and the main burner
will light at minimum gas rate.
Check that the burner pressure is 0.1kPa. If this is
incorrect, it may be adjusted by removing the cap and
turn the larger adjusting nut of the modulator,
(anticlockwise to decrease pressure).
If the above adjustment was necessary, it will be
essential to check that the maximum pressure can still be
obtained. Push the spindle gently in to the stop and hold
it in. The maximum pressure should not be less than
0.82kPa. If this pressure cannot be achieved, obtain it by
turning the small adjusting nut (clockwise to increase the
pressure). Always adjust the minimum pressure first.
If the maximum pressure is unobtainable, check that the
gas supply is of adequate size, refer to Section 1.8.
Put right as necessary.
Isolate the boiler from the electrical supply then
reconnect the modulator cable and refit the cap.
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