Burner Pressure - Hot Water - Sit; Burner Pressure - Hot Water - Glow-worm swift flow 100 Installation Instructions Manual

11.5 Burner Pressure - Hot Water - SIT

The burner pressure is factory preset and no adjustment
should be required.
Switch on the electrical supply, the pump and fan will
operate for about 30 seconds, then the fan will reduce speed
and the pump stop.
Relight the pilot.
Turn gas control knob "D" to
Fully open the largest hot water draw off tap and the main
burner will light, the flames gradually increasing to
maximum.
Check the soundness of the gas joints, with the main burner
on, using a suitable leak detection fluid.
Adjust the water throttle to obtain a flow rate of 12Litre/
min (2.65gall/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.
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 that the burner pressure is 16.3mbar +/- 0.35mbar
(6.5in wg +/- 0.14in wg). If this is incorrect, the burner
pressure may be adjusted by turning the larger brass
adjusting nut of the modulator, anti-clockwise to decrease,
after removing the cap. See diagram 11.2.
Fine adjustment may be achieved by turning the hot water
gas pressure adjuster, (potentiometer), using an insulated
screwdriver, see diagram 10.1. 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 adjustments 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 is of adequate size, refer to Section 1.8.
DOMESTIC
HOT WATER
THROTTLE
220650B
1 1 C o m m i s s i o n i n g
, main burner position.
Diagram 11.4

11.5 Burner Pressure - Hot Water -

Honeywell
The burner pressure is factory preset and no adjustment
should be required.
Connect the electrical supply, the pump and fan will
operate for about 30 seconds, then the fan will reduce
speed and the pump stop.
Relight the pilot burner.
Fully open the largest hot water draw off tap whereby
the main burner will light, the flames gradually
increasing to maximum.
Check the soundness of the boiler gas joints, with the
main burner on, using leak detection fluid. Take care not
to splash any of the electrical components.
Fully open the hot water throttle, (clockwise), see
diagram 11.4. Check that the water flow rate is not less
than 11Litre/min (2.4gall/min) to prevent any
modulation of the gas pressure. This is equivalent to 5.5
seconds to fill a 1Litre container (3.1 seconds for 1pint).
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 +/-0.35bar (+/-0.14in
wg) of 15.8mbar (6.3in wg), the hot water burner
pressure. 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 10.1. 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 is of adequate size, refer to Section 1.8.
24