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4.5 Water Valves
The electronics control the water valves so that a constant water temperature is achieved in the bowl
irrespective of the temperatures and pressures of the household hot and cold water systems. To achieve
accurate water temperatures a proportional water valve is used on the cold water inlet. Unlike
conventional water valves which are either fully on or fully off, the proportional water valve can be
controlled so that it can turn on at any water flow rate between fully on and fully off.
Proportional Valve Standard Valve
Filter colour White or Blue Red or Yellow
Shape of water valve
plunger
Has no stand offs within
outlet nozzle
Has four stand offs visible within
outlet nozzle
Difference between a
Proportional and
Standard Water Valve
Specifications
Phase 1 to 4 - 12 Volts DC Posilock contacts.
Hot Valve Digital Valve Resistance 15 ohms @ 20
o
C
Cold Valve Proportional Valve Resistance 15 ohms @ 20
o
C
Proportional valve fitted to cold on all models. Standard Valve on hot.
Phase 5 - 24 Volts DC with RAST 2.5 Connector.
Hot/Cold Digital Valve Resistance 64 ohms @ 20
o
C
Cold Valve Proportional Valve Resistance 64 ohms @ 20
o
C
Proportional valve fitted only to cold on GW and IW models.
Standard Valv Flow Rate 10 L per minute max
Proportional Valve Flow Rate 16 L per minute max
Operating pressure Max 1Mpa (150PSI) Min 20 kpa (3 PSI)
Always check the resistances when replacing the Motor Controller. If the resistance is low always replace
the water valve. Remember if the valve is hot the resistances can increase by as much as 50%. The fault
numbers associated with the water valves are 33, 48, 49 and 50. If inlet water is 5 litres a minute flow or
less, flow restricting washers may be removed from water valves. Large bore inlet hoses p.n. 426123
should be used in these circumstances.
The water valves may be manually turned on from Diagnostic
Mode. Press ‘Wash Temp Down’ and ‘Power’ buttons
together. Phase 3 Only press ADVANCE key once. The ‘Wash
Temp Down’ button turns the cold water valve on or off. The
‘Cold Water’ LED will turn on. The ‘Wash Temp Up’ button
turns the hot water valve on or off. The ‘Hot Water’ LED will
turn on. NB. Phase 2 it is possible to latch water valves on in
this mode. Power off at the wall to resolve.