Glow-worm hxi and Gas Valve - Manual (Page 29)

29 0020008153-05
10.1 Preliminaries - All Systems
Remove inner casing panel, see diagram 10.1.
A competent person in accordance with the current issue of
BS6798 should carry out commissioning.
Make sure that the system has been thoroughly flushed out with
cold water.
Refill the system with water, making sure that all the air is
properly vented from the system and pump, diagram 10.2
shows vent point.
Before operating the boiler check that all external controls are
calling for heat.
10.2 Sealed Systems
Fill the system until the pressure gauge registers the
recommended pressure. Clear any air locks and check for
leaks.
Release the cold water to the initial design pressure.
10.3 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 service cock, slot in line with the length of the valve,
see diagram 7.1.
10.4 Initial Lighting
The lighting procedure of the boiler is fully automated.
Check that all external controls are calling for heat. If an integral
programer is fitted check that it is correctly programmed and if
necessary overridden to provide heat.
Ensure that the water temperature control knob is turned OFF.
Turn on the mains electrical supply and the mains reset switch
to (I) on the controls fascia.
Turn the water temperature control knob to (I) MINIMUM.
The fan should start and after a few seconds the ignition will
commence
If the burner fails to light the fan will stop. Initially this may be due
to air in the gas supply line. The boiler will automatically have
three attempts at ignition.
If necessary turn the mains reset switch to the off position (O),
then back to the on position (I) and the boiler will restart.
After the boiler has lit, allow to warm at MINIMUM temperature
setting to purge any air from the system.
NOTE: If the appliance is operated above MINIMUM on initial
lighting, there is a possibility that the overheat stat will trip, this
is due to air in the system having not been purged. See diagram
10.2 for overheat thermostat/reset switch.
Once the system has been purged of air turn the central heating
knob to the desired temperature.
The appliance will then continue to fire until the user controls are
satisfied.
NOTE: After first power up the firing sequence for central
heating changes. After one minute stabilisation time the boiler
will ramp slowly to full rate rather than going immediately to full
rate. This is an adaptive feature to cope with small system
requirements.
10 Commissioning
Diagram 10.3
PRESSURE TEST
POINT
ELECTRICAL
PLUG
Diagram 10.2
VENT POINT
GAS
VALVE
THROTTLE
OFFSET
ADJUSTMENT
FLOW
THERMISTOR
RETURN
THERMISTOR
11404
12412
Diagram 10.1
INNER
CASING
PANEL
CASING
PANEL
12354
SECURING
SCREWS
SECURING
SCREWS (2 OFF)
RETURN
PIPE
OVERHEAT
THERMOSTAT /
RESET SWITCH
FLOW
PIPE