Temperature Settings; Heating System Commissioning - Glow-worm Swift flow 120 Installation Instructions Manual

11.7 Domestic Water Flow Rate
Fully open the largest domestic hot water draw off tap.
Adjust the water throttle to obtain a flow rate of
14.4Litre a minute (3.2gall/min), clockwise to increase,
see diagram 11.5. This is equal to 4.2 seconds to fill a
1Litre container, 2.3 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 16.7 seconds
to fill a 1Litre container, 9.4 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 domestic hot water draw off tap.
11.8 Burner Pressure - Heating
Note. This appliance is preset to a central heating output
of about 60,000 Btu/h (17.6kW).
If required the central heating output may be adjusted up
to 80,000 Btu/h (23.5kW), see Table 1.
Check that all remote heating system controls, room
thermostats, time switches and the like are switched on
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), at 2.7mbar (1.1in wg). If
required the burner pressure can be adjusted to within +/-
0.2mbar (+/- 0.08ing wg) at 5.6m bar (2.2in wg) this is
equal to 80,000 Btu/h (23.5kW).
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 11.6. Turn the adjuster slowly,
always making adjustment by reducing below the
required pressure then increasing up to the required
setting, turn clockwise to increase.
Recheck after 5 minutes. If appliance is operating with a
long flue, this may require a longer period before
checking.
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 and secure the control housing and cover to the
boiler.
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11.9 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
o o
water outlet is 60 C (140 F) at a flow rate of 3.6Litre a
minute (0.8gall/min).
The nominal flow temperature setting for central heating
o o
is 82 C (180 F), with the user central heating
temperature control set to maximum.

11.10 Heating System Commissioning

Check that all remote heating system controls are calling
for heat.
Fully open all radiator valves, flow control valve "A"
and bypass valve "B", see diagram 4.2.
Set the heating system in operation and balance the
radiators.
Adjust flow control valve "A" to achieve the required
system differential temperature between the boiler flow
and return.
Turn off all radiators, then adjust bypass valve "B" to
achieve the same temperature difference between the
boiler flow and return.
Refer to Section 4.6 and diagram 4.1.
Allow the system to reach maximum temperature then
switch off, isolate the boiler from the electrical supply
and drain the system rapidly whilst hot, using the
external drain tap at the lowest point of the system.
Fill and vent the system as described previously in
Section 11.2. Add the inhibitor, if required, refer to
Section 4.10.
Lower the pressure to the initial cold fill design pressure,
using the draining tap, close to the boiler refer to Table
2 and Section 4.11.
Set pointer on the pressure gauge to this pressure.
Lock or remove the handles from the spindles of flow
controls valve "A" and bypass valve "B" to prevent
unauthorised adjustment.
The permanent mains electrical supply to the boiler must
not be switched off whilst the pilot flame is alight.
220674B