Glow-worm Energysaver Combi 80-100 - Manual (Page 20)

20 221564F
Please ensure the “Benchmark” logbook is completed and left
with the user.
11.1 Filling Domestic Water Circuit
Fully open any valves in the domestic water supply to the boiler.
Open the two domestic water isolation valves, slots in line with
the length of the valve, see diagram 8.1.
Open all hot water taps in turn and close them when water flows.
Check for water soundness of the complete domestic water
system.
The water flow rate is regulated to 12 litres/min by a restrictor
fitted into the boiler pipe work.
11.2 Filling the Heating Circuit
Open the two central heating isolating valves, slots in line with
the length of the valve, see diagram 8.1.
Flush, fill and vent the system refering to sections 4.5 and 9.2.
Make sure that the automatic air vents are operating correctly,
see diagram 11.1, and that their black caps are
loosely fitted to
allow air to escape.
Diagram 11.1
6549
AUTOMATIC
AIR VENTS
CYLINDER
SECURING
COLLAR
Pressurise the system until the pressure gauge reads at least
1.0bar (14.5lbf/in
2 ), see diagram 1 in Instructions for Use.
Check the heating system and boiler for water soundness.
11.3 Preparation for Lighting
Isolate the boiler from the mains electrical supply.
Test for gas soundness and purge air from the gas supply. Turn
on the gas isolation valve, slot in line with the length of the valve,
see diagram 8.1.
11.4 Initial Lighting
The lighting procedure of the boiler is fully automated. Check
that all external controls are calling for heat. If an integral clock/
timer is fitted check that it is correctly programmed and if
necessary overridden to provide heat.
Turn on the mains electrical supply. After a short delay the
digital display on the fascia should illuminate, see diagram 1 in
Instructions for Use.
The fan should start and after a few seconds the ignition will
commence.
If the burner fails to light the fan will stop and the display will flash
'0'
and then
'2
*
'
. This indicates the boiler has failed to light,
which initially may be due to air in the gas supply line.
Press the ‘Reset’ button and the boiler will restart, see diagram
1 in Instructions for Use
Flashing digits indicate a fault. Refer to fault finding if any fault
persists, see section 13.
After the burner has lit, the boiler will initially heat up the
domestic hot water cylinder. This will take approximately four
minutes.
After this a pump overrun will operate to ensure that the stored
water temperature is not too high.
After a short period the three way valve will switch to central
heating.
The boiler will continue firing in central heating mode until the
user controls; ie. time clock or room thermostat are satisfied, or
there is a demand for hot water.
11.5 Gas Pressure
The gas valve is factory set and should need no adjustment. It
should be checked that the supply pressure is 20mb when the
boiler is firing at full rate. This can be achieved by turning on
several hot water taps and checking the inlet pressure at the
tapping on the gas valve shown in diagram 11.2. Turn taps off
and disconnect pressure gauge.
NOTE: The burner pressure is altered by the suction of the fan
and is modulated according to demand.
11.6 Testing - Heating System
Check that all remote controls are calling for heat. The boiler will
fire automatically. Fully open all radiator valves, flow control
valve ‘A’ and additional bypass valve ‘B’ if fitted, see diagram
4.2.
Balance the radiators as required and if fitted adjust valve ‘A’ to
give the required system differential. Turn off all radiators that
can be shut off by the user and adjust the boiler bypass if
necessary to achieve less than the maximum differential allowed
of 20
°
C across flow and return.
If this is not possible, a separate system bypass must be fitted
and adjusted to achieve less than maximum differential. Refer
to section 4.3 and diagram 4.2.
Allow the system to reach maximum temperature then switch
off the boiler by isolating from the electrical supply.
Drain the entire system rapidly whilst hot, using the drain tap at
the lowest part of the system. Fill and vent the system as
described previously in section 11.2.
Lock or remove the handles from controls valve ‘A’ and bypass
valve ‘B’ if fitted to prevent unauthorised adjustment.
11.7 User Control Door - Fitting
Take the control door, which was removed from the top of the
boiler carton and fit the the two brass lugs. Push the lugs into the
slots at the bottom of the fascia to engage, see diagram 11.3.
11.8 User Controls and Options
The Energysaver Combi has a multifunctional single digit
display and two control buttons labelled ‘Mode’ and ‘Reset’, see
diagram 1 in Instructions for Use.
The ‘Reset’ button is used to restart the boiler after a fault
condition has occurred, ie. ignition failure, low water pressure or
high water temperature.
The ‘Mode’ button allows the user to view the operating conditions
of the boiler, or if necessary change the domestic or central
heating temperatures to a preferred setting. The boiler is factory
pre-set to supply Domestic hot water up to 65
°
C and central
heating up to 70
°
C.
11 Commissioning