Commissioning - Alpha InTec2 25XE Installation And Servicing Instruction

5

COMMISSIONING

When commissioning the boiler, ensure the Benchmark Checklist at the back of these instructions is completed.
5.1 FILL THE SYSTEM
1. The boiler is fitted with an automatic air vent positioned on the pump (see Fig. 6.7), ensure that the vent is always open.
2. Open the central heating flow and return valves (operating lever in-line with valve) (see Fig. 4.4).
3. Open the fill point valves on the filling loop until water is heard to flow.
4. To remove the air - Vent each radiator in turn, starting with the lowest in the system.
5. Vent air from the primary heat exchanger via the manual vent at the top right hand side (see Fig. 6.7).
6. It is important that the pump is properly vented to avoid it running dry and damaging its bearings. Unscrew and remove the
cap from the centre of the pump. Using a suitable screwdriver rotate the exposed spindle about half a turn, then replace
the cap.
7. Check the operation of the safety valve (see Fig. 6.7) by turning the head anti-clockwise until it clicks. The click is the
valve lifting off its seat allowing water to escape from the system - check that this is actually happening.
8. Continue to fill the system until the pressure gauge indicates 1.0 bar. Close the fill point valve and check the system for
water soundness. Disconnect the filling loop from the mains supply.
Water may be released from the system by manually opening the drain point (see Fig. 6.7) until the system design
pressure is obtained. The system design pressure (cold) should be between 0.75 and 1.25 bar.
Refer to Sections 3.8 and 3.9. Filling and Flushing the system.
9. Open the cold water mains inlet valve (see Fig. 4.4). Turn on all hot water taps and allow water to flow until no air is
present. Turn off taps.
10. Ensure that the condensate trap has been filled with water.
The condensate trap will be filled automatically when venting the heat exchanger in paragraph 5 above.
5.2 BOILER CONTROLS - Fig. 5.1
5
21
1 On-Off/Standby button
2 Summer/Winter button
3 Reset button
4 Information button
5 Domestic hot water temperature
selector switch
6 Central heating water temperature
selector switch
7 Heating system pressure gauge
8 DHW mode active
5.3 TEST FOR GAS TIGHTNESS AND PURGE THE SUPPLY
1. With the boiler connected, pressure test the gas supply and inlet pipework connected to the boiler for tightness in
accordance with BS 6891.
2. Loosen the gas inlet pressure test point screw on the gas valve (see Fig. 5.2) and purge in accordance with BS 6891.
3. Retighten the test point screw and test for gas tightness. Close the boiler gas service cock.
4 3 2 1
RESET
RESET
°C
bar
BOOST x100rpm
INFO
9 Boiler locked, requires reset via 'RESET'
button
10 Flame present symbol and relative
power scale
11 Operating in summer mode
12 Operating in winter mode
13 Central heating mode active
14 Temperature indicator, boiler info and
error codes
15 Boiler in Stand-by mode
7
6
3
2
4
bar
1 5
0 6
bar
16 Presence of external connected devices
17 Solar function active
18 Functioning with external temperature
19 Boiler connected to remote control
20 Not used on this model
21 Optional boiler controls (if fitted)
Fig. 5.1
Alpha InTec² 25XE and 28XE - Commissioning
8 9 10 11
RESET
°C
bar
BOOST
x100rpm
20 19 18 17
probe active (optional)
(optional)
12 13
14
16 15
25