Alpha E-Tec Plus 28NX, 33NX and 38NX - Routine Servicing
4. Refill, vent and re-pressurise the system as necessary. (Refer to Commissioning, Section 6.1).
If the system pressure exceeds 2.5 bar when operating at maximum temperature, the heating expansion vessel should
be checked and re-pressurised, if necessary.
Note: 1. Check the expansion vessel charge only when the system pressure is zero.
2. The expansion vessel pressure test point is accessible from on top at the top left side.
5. Check that the condensate trap drain pipe is connected and all joints are sound.
6. Record details of the service in the Service Record at the back of these instructions.
7.2 CASING REMOVAL - Figs. 7.1, 7.2, 7.3 and 7.4
To facilitate boiler servicing and maintenance the casing canbe completely removed as follows:
Case front panel - Fig. 7.2
4. Remove the two screws 'C'.
5. Pull the front panel 'D' slightly towards you.
6. Release the front panel 'D' from pins 'E' pulling it
towards you while pushing it upwards at the same time.
When reassebling the front cover, push it against the boiler
with the flap closed, then open the flap to snap it around the
keypad.
It is important the flap is closed otherwise the hinge
springs scrape against its housing in the control panel.
Fig. 7.2
Combustion panel - Fig. 7.3
7. Remove the two screws at the bottom of sides of the
panel 'F'.
8. Pull the panel 'G' slightly towards you.
9. Release the panel 'G' from the pins 'H' pulling it
towards you while pushing it upwards.
Take care not to damage the insulation on the back of
the panel as this forms part of the casing room seal.
Fig. 7.3
Bottom cover - Fig. 7.1
1. Remove the two screws 'A'.
2. Press the retaining hooks 'B' of the bottom cover inward.
3. Remove the bottom cover 'B'.
1
1
1
2
2
3
3
A
A
B
Fig. 7.1
6
6
4
4
5
C
D
C
E
E
7
7
8
8
9
9
F
G
H
H
50
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