66 | Inspection and maintenance
Greenstar FS
6 720 810 590 (2015/05)
Fig. 77 Filter in fresh water pipe (combi boiler KWB.-3A only)
15.1.3 Plate type heat exchanger (only combi boiler KWB..-3A)
If the DHW output on the combi boiler is significantly reduced:
▶ Check filter in the cold water pipe for contamination ( Fig. 65).
▶ Depressurize the appliance.
▶ Remove the plate type heat exchanger and replace with a new unit.
-or-
▶ Descale with descaling agent approved for stainless steel (Grade
316-1.4401).
To remove the plate type heat exchanger:
▶ Unplug electrical connections.
▶ Remove hose from safety relief valve.
Fig. 78 Unplugging electrical connections / removing hose from PRV
▶ Loosen/remove pipe connections.
Fig. 79 Removing pipe connections
▶ Remove the boiler pressure gauge from the Heatronic boiler control.
Fig. 80 Removing the boiler pressure gauge
▶Loosen the quick releases (steps 1 and 2) and remove the hydraulic
assembly in its entirety (step 3).
6 720 641 933-92.1o
1
2
3
6720810590-41.1Wo
6720810590-42.1Wo
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