Glow-worm Ultrapower sxi Series Installation And Servicing page 41

4. Fully open the taps on the filling loop to fill the
heating system to a pressure of 1.0bar. Close the filling
taps. If the domestic cold water is below 10
frost protection may operate and a F1 will be displayed,
clear by pressing "Reset", you may have to repeat this
process until the pressure is 1 bar.
5. Vent all air from the system and vent the CH pump via the
front screw - repeat step 4 as neccessary until the system
is full and all the air has been removed.
6. Make sure that the automatic air vent works correctly and
that the black cap is loosely fitted to allow air to escape.
7. To comply with the water regulations the flexible hose
must be disconnected from the double check inlet valve
- undo the nut and pull the flexible hose from the valve.
12.3 Initial Lighting
The lighting procedure of the boiler is fully automated.
Check that all external controls are calling for heat.
Open the gas isolation valve.
Repeatedly press the "MODE" button until the
symbols are displayed.
The hot water tank has priority over central heating.
The appliance will enter a self-checking routine then the
ignition sequence will commence.
The digital display will show the tank temperature setting in
hot water mode.
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 five attempts at ignition.
If the burner fails to ignite the display will show F1.
Depress the "reset" button on the fascia to clear the display
and repeat the ignition sequence.
When the tank is full (and after a short pump overrun period)
a central heating demand will be initiated.
12 Commissioning
AUTOMATIC
AIR VENT
CAP
Diagram 12.3
C the tank
O
and
°C
bar
°C
bar
41
DOMESTIC
PUMP
Once the system has been purged of air set the hot water to
the desired temperature by using the hot water "+" and "-"
buttons.
Open a hot water tap, check that hot water is available and
then close the hot water tap.
Set the central heating water temperature to the desired
temperature by using the central heating "+" and "-" buttons.
The appliance will then continue to fire in central heating
mode until the user controls are satisfied or there is another
demand made for hot water.
NOTE: After ignition in central heating demand the boiler will
remain at minimum power for one minute before going to full
rate.
12.4 Re-pressurising System (if required)
1. Ensure that the filling loop flexible hose is securely
connected to the double check inlet valve, see diagram
12.2.
2. Fully open tap"A", then gradually open tap "B" to fill the
heating system to a pressure of 1.0bar. When completed
close the filling taps.
3. Vent all air from the system - repeat step 2 as neccessary
until the system is full and all the air has been removed.
4. IMPORTANT: To comply with the water regulations the
flexible hose must be disconnected from the double check
inlet valve - undo the nut and pull the flexible hose from
the valve.
DOMESTIC
PUMP VENT
Diagram 12.4