MAINTENANCE GUIDE 3. HYDRAULIC UNIT Rotate clockvise to unhook the locking ring. 3.1 RIGHT HAND HYDRAULIC BLOCK ASSEMBLY 1 9 2 3 4 8 2 7 6 Remove the 3 way valve motor. 11 5 10 Legend: 1 - Diverter valve motor 2 - Diverter valve 3 - By-pass 4 - D.H.W. flow switch assembly 5 - C.H. drain valve 6 - Central heating filter 7 - Pump 8 - Water pressure sensor 9 - Auto air vent 10 - Central Heating return 11 - Cold water inlet (D.H.W.) 3 3.2. 3 Way valve unit Tools Remove the clip and lift the diverter valve from the assembly. Drain the boiler (see 3.3). Unplug the diverter valve cable TIME 5 min 1 4 WHEN REASSEMBLING, ENSURE THE DIVERTER VALVE IS ALIGNED CORRECTLY. 50 /
MAINTENANCE GUIDE 3.3 Draining 3.5 Primary water pressure sensor Tools TIME 5 min Turn the drain valve anti-clockwise to open and drain the water from the boiler Tools TIME 5 min Drain the boiler (see 3.3). Slide the fixing clip, (it is held captive) unplug the electrical connector and lift the sensor from the assembly. 1 1 3.4 Automatic air vent Tools TIME Drain the boiler (see 3.3). Unscrew anticlockwise the AAV from the assembly. 5 min 2 1 2 / 51
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ELCO Heating Solutions - Commercial Heating and Hot Water