Inspection and service
Greenstar – 6721852556 (2022/11)
22
Table 25 Bypass valve positions
Heat meter
▶ Drain the HIU completely.
▶ Remove the connected sensor (primary circuit flow).
1. Remove the front cover by pulling forward.
2. Detach heat meter upwards from the holder.
3. Detach the holder from backstage insulation.
4. Unscrew connections.
▶ Use the new gaskets.
Fig. 45 Heat meter removal
Expansion Vessel
▶ Drain the HIU completely.
▶ Retract the securing clip [3] on the expansion vessel connection.
▶ Unscrew the screw [1] on the holder.
▶ Ease forward and then lift up the expansion vessel [2] out of the
connector and foam insulation.
Fig. 46 Expansion vessel removal
Flow turbine, flow limiter
▶ Drain DHW circuit completely.
▶ Unplug the connecting lead from the turbine.
▶ Undo screw fittings [5].
▶ Remove clip [1] and pull off pipe [4].
▶ Remove strainer [3], clean thoroughly and re-install.
▶ Take flow turbine and limiter out of the enclosure [2].
▶ Take flow turbine [8] out of the flow regulator housing [7] and
remove from the flow limiter [6].
▶ Apply silicone lubricant to the seals to ease assembly.
▶ Purge the system correctly and check for leaks.
Position
°C
Position
°C
Position
°C
|
10
3
40
6
60
1
20
4
45
7
65
2
30
5
50
8
70
6720808926-71.1W
o
1
2
3
