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8.1.7 Pressure Reducing Valve
• This water heater is supplied with a PTR valve rated at 850kPa and is designed for direct-
connection to mains water supply with a pressure not exceeding this rating.
•
should be connected at Point 8 in section in section 7.1 Connection
Dimensions and Components under the socket marked “PRESSURE REDUCTION VALVE”.
• The relief valve must be installed so that the drain line is facing downwards at all times with
the discharge point remaining open to the atmosphere.
8.1.8 Non-return/Isolating Valve
• It is compulsory that a non-returning/isolation valve is installed directly into the cold-water
supply line feeding the system. This will allow the hot water system to be isolated from the
rest of the homes water supply, making servicing, draining and replacing the unit easy. A
hose-set must not be used to connect the system to water supply.
• The non-return/isolation valve can be combined with a PRV valve to form a duo valve.
Filling the system
• Once the system has been connected in accordance to Section 7.0 and 8.0 of this hand-
•
the same time, ensure at least one hot water tap is open inside the property. While the sys-
This is called “bleeding the system” and it ensures that no air pockets remain. Once water
begins running out of the hot water tap, the system is completely bled and you can then
turn the tap off.
• Always ensure that the tank is completely full before connecting and turning on the
electricity supply.
8.1.9 Water Quality
•
• The water quality should be analyised before system running, to measure the PH value,
conductivity, Chloride ion concentration and sulphate ion concentration.
• The acceptable water quality standard is showed as below table.
PH Hardness Conductivity Sulphate Chlorine Ammonia Silicon Iron Ca
7 - 8.5 < 50ppm None < 50ppm None < 50ppm < 0.3ppm < 50ppm
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