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

29 0020015347-03
11 Commissioning
Diagram 11.3
ELECTRICAL
PLUG
GAS
VALVE
PRESSURE TEST
POINT
12402
11.2 System Commissioning
Open the two central heating isolating valves, slots in line with
the length of the valve, see diagram 7.1
To enable the system pressure to be viewed, turn the heating
temperature knob to the OFF position .
Turn the mains electricity supply on to the appliance and ensure
that the mains switch on the appliance fascia is set to the on
position.
The system pressure should be viewed on the digital display on
the front of the appliance, see diagram 1 of the Users Instructions.
Pressurise the system until the pressure on the display reads at
least 1.0bar.
Make sure that the automatic air vent works correctly and that
the black cap is loosely fitted to allow air to escape, see diagram
11.2
Check the heating system and boiler connections 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 7.1.
11.4 Initial Lighting
The lighting procedure of the boiler is fully automated.
Ensure that the central heating water temperature control knob
is turned OFF.
Turn on the mains electrical supply and the mains reset knob to
(I) on the controls fascia.
The digital display will show system pressure.
Turn the central heating water temperature control knob to (I)
MINIMUM.
The digital display will now show water temperature.
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 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 thermostat will
trip and "F5" will be displayed on controls fascia, this is due to
air not having been completely purged. See diagram 14.13 for
reset switch.
Once the system has been purged of air, turn the central heating
water temperature control knob to the desired temperature.
The appliance will then continue to fire until the user controls are
satisfied.
NOTE: That after first power up the firing sequence 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.
THROTTLE
OFFSET
ADJUSTMENT
11.5 Testing - Gas
Case Off Case On
Burner CO
2
(G20) 9.1+0.2-0.5 9.3+0.3-0.5
Burner CO
2
Propane (G31) 10.5+0.3-0.7 10.7+0.3-0.8
Should any doubt exist about the gas rate, check it using the
gas meter test dial and stop watch at least 10 minutes after the
burner has lit, making sure that all other gas burning appliances
and pilot lights are off.
The approximate gas rate: 18sxi : 2.0m 3 /h (71 ft 3 /h)
30sxi : 3.0m 3 /h (107 ft 3 /h)
NOTE: (LPG (G31) should be adjusted as described on the
previous page. (It should be checked that the supply pressure
is 37mb for LPG appliances).
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 checking the
inlet pressure at the pressure test point on the gas valve shown
in diagram 11.3.
Disconnect pressure gauge.
NOTE: That the burner pressure cannot be measured at the
gas valve as it is altered by the suction of the fan and modulated
according to demand.
Replace inner casing panel and front casing panel, see diagram
11.1.