Glow-worm 18sxi, Installation And Servicing Manual, Page: 36 / 64

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12 Commissioning
Diagram 12.2
CENTRAL HEATING ISOLATION VALVES
GAS SERVICE ISOLATION VALVE
ALL SHOWN CLOSED
DRAIN POINTS
UNDERSIDE VIEW OF BOILER
PRESSURE
TEST POINT
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12.1 Preliminaries - All Systems
The commissioning should be carried out by a competent
person in accordance with the current issue of BS6798.
DO NOT operate the boiler without water.
Make sure that the system has been thoroughly flushed
out with cold water and that all cleanser, if used, has been
removed.
Isolate the boiler from the mains electrical supply and test for
gas tightness and purge air from the gas supply.
12.2 LPG Conversion
All models can be converted to run on LPG-Propane (G31).
This conversion should be carried out by a competent person
as described in section 12.10.
12.3 Filling the Heating Circuit
With the gas isolation valve closed and with no demand
from any external controls switch on the power supply to the
boiler.
The boiler should be in “OFF” mode, this will be indicated
on the user interface display, refer to diagram 12.1. If not,
press the “Mode” button repeatedly until the “OFF” symbol is
displayed, then continue as follows:
1. Open the Central Heating Flow and Return isolating
valves marked ‘A’ using a screwdriver or a 4mm allen
key - slot in line with the axis of the valve (shown closed
in diagram).
2. Fill the heating system to a pressure of 1.0bar. The
system pressure will be displayed on the user interface.
3. Vent all air from the system - repeat as neccessary
until the system is full and all the air has been vented.
12.4 Initial Lighting
NOTE : If you have fitted a Glow-worm Options Board
Kit, please refer to the instructions supplied with the kit for
completion of commissioning.
Do not operate the boiler without water.
Refer to diagram 12.1
1. With no demand from any external controls, switch on the
electrical supply to the boiler.
2. Open the gas service isolation valve, see diagram 12.2.
3. Select your required function by pressing “ Mode”, scroll
through your options and select one of the following:-
Central heating.
Boiler functions ALL swicthed off.
“OFF”
4. Turn ON your external controls and select the room
temperature required.
The boiler will operate automatically.
NOTE
: The display will indicate the Heating system water
temperature or a fault code if in a fault condition.
Diagram 12.1
MODE
PROG
SYMBOLS DISPLAYED ON THE LCD AND DESCRIPTIONS
System Pressure
Max burner display
Min burner display
Temperature
Appliance OFF
Central Heating Function
LCD
DISPLAY
RESET
BUTTON
NOT
USED CH TEMPERATURE
ADJUSTMENT
TOGGLE BUTTON
MODE and PROG
Glow-worm control (Optional) Ext
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12.5 Gas Inlet Pressure
Check the supply pressure at the gas service isolation valve
test point, see diagram 12.2.
The nominal supply pressure should be 20mbar when the
appliance is operating at the maximum heat input. This can be
achieved by turning on several hot water taps.
NOTE :
There is a pressure drop over the gas service isolation
valve prior to the inlet pressure test point, this is normal and
the inlet pressure to the main gas valve can be up to 2mbar
less than the supply pressure to the boiler at the maximum
heat input. Additionally the safe nominal maximum heat input
of the appliance can be achieved at an inlet pressure down to
15mbar.