Glow-worm swift flow 100e Installation Instructions Manual page 24

11.5 Gas Rate Modulation
The minimum gas rate is factory preset and no
adjustment should be required.
ALWAYS CHECK HOT WATER BURNER
PRESSURE FIRST - REFER TO SECTION 11.4.
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 1.8mbar +/-0.2mbar
(0.7in wg +/-0.1in wg). 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
16.0mbar (6.4in wg). 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 1.7. Put
right as necessary.
Isolate the boiler from the electrical supply then
reconnect the modulator cable and refit the cap.
11.6 Domestic Water Flow Rate
Adjust the water throttle to obtain a flow rate of 12Litre
a minute (2.6gall/min), clockwise to increase, see
diagram 11.4. This is equal to 5.0 seconds to fill a 1Litre
container, 2.8 seconds to fill a 1pint container.
Close the tap when adjustment is satisfactory.
The minimum water flow rate for operation of the boiler
is 3.6Litre a minute, (0.8gall/min), equal to 16.5 seconds
to fill a 1Litre container, 9.5 seconds for 1pint. If this
flow rate cannot be achieved, check that there is no
blockage and that the supply pressure is adequate.
Refer to Table 2.
Close the hot water draw off tap.
221141C
1 1 C o m m i s s i o n i n g
11.7 Burner Pressure - Heating
The burner pressure is factory preset and no adjustment
should be required.
Check that all remote heating system controls, room
thermostats, time switches and the like are switched on/
programmed and calling for heat.
Set switch "C" to "ON", white flash showing, see
diagram 11.1.
The pump will circulate water through the boiler and the
main burner will light.
Check that the burner pressure, with the heating system
cold and temperature control knob at maximum, to
prevent any modulation of the gas pressure, is within
+/- 0.2mbar (+/-0.08in wg), of 6.2mbar (2.6in wg). If
the burner pressure is incorrect, it may be adjusted to the
correct setting by turning the central heating gas pressure
adjuster (potentiometer) using an insulated screwdriver,
see diagram 11.3. Turn the adjuster slowly, always
making adjustment by reducing below the required
pressure then increasing up to the required setting, turn
clockwise to increase.
Isolate the boiler from the electrical supply.
Remove the pressure gauge and tighten the test point
screw.
Test for gas soundness around the burner pressure test
point with the main burner alight, using a suitable leak
detection fluid.
Refit the cover of the control housing and refit the
housing to the boiler.
11.8 Temperature Settings
The domestic hot water outlet and central heating flow
temperatures are factory preset and sealed.
The nominal temperature setting for the Domestic Hot
Water outlet is 55
minute (0.8gal/min).
The nominal flow temperature setting for central heating
is 82
temperature control set to maximum.
24
o o
C (131 F) at a flow rate of 3.6Litre a
o C (180 o F), with the user central heating