Glow-worm swift flow 75e Installation Instructions Manual page 23

11.4 Burner Pressure - Hot Water
The burner pressure is factory preset and no adjustment
should be required.
Connect the electrical supply; the pump will operate for
about 30 seconds, then the pump will stop.
Fully open the largest hot water draw off tap whereby
the main burner will light, the flames gradually
increasing to the maximum.
Check the soundness of the boiler gas joints, with the
main burner on, using a leak detection fluid. Take care
not to splash any of the electrical components.
Fully open the hot water throttle, (clockwise), see
diagram 11.5. Check that the water flow rate is not
less than:
75e: 10.5 l/min (2.3 g/min), equivalent
to 5.7 seconds to fill a 1 litre
container, or 3.3 seconds to fill a 1
pint container.
80e: 11.2 l/min (2.5 g/min) equivalent
to 5.4 seconds to fill a 1 litre
container, or 3.0 seconds to fill a 1
pint container.
To achieve this flow rate a water pressure of at least
0.8bar is required during commissioning, although
subsequently the appliance will work at a minimum
pressure of 0.5bar.
This flow rate should prevent any modulation of the
gas pressure.
Check the burner pressure is within +/-0.35mbar
(+/-0.14in wg). of 15.6mbar (6.3in wg) for the 75e and
15.8mbar (6.3in wg) for the 80e. If this is incorrect, the
burner pressure may be adjusted to the correct setting by
turning the hot water gas pressure adjuster
(potentiometer), using an insulated screwdriver, see
diagram 11.4 . Gain access to the adjusters on the
control board by removing the control housing cover, see
diagram 10.1. Turn the adjuster slowly, always making
adjustment by reducing below the required pressure then
increasing up to the required setting, (turn clockwise to
increase).
Close the hot water draw off.
If the maximum pressure cannot be obtained, check that
the gas supply of adequate size, refer to Section 1.7.
1 1 C o m m i s s i o n i n g
23
CENTRAL
HEATING
GAS PRESSURE
ADJUSTER
CONTROL
BOARD
DO NOT
ADJUST
HOT WATER
GAS
PRESSURE
ADJUSTER
Diagram 11.4
221138C