WATER REQUIREMENTS
3.1 All 7kW heaters must be installed using the supplied 2.5bar pressure
reducing valve and have a cold supply minmum pressure of 0.1Mpa (1bar) and
a maximum of 0.25Mpa (2.5bar). 9kW and 12kW heaters have an operational
pressure range of 0.1Mpa (1bar) to 0.7Mpa (7.0bar). Both inlet and outlet
connections are suitable for 15mm diameter copper pipe.
3.2 The tee piece and expansion relief valve must be situated where shown
(see gure3.) and the relief valve discharge port plumbed via an air break
(tundish) to a safe, visible place where there is no risk to persons.
3.3 The discharge pipe must fall continuously from the valve outlets and be
unobstructed.
3.4 The provision of a service stop valve in the cold supply pipe will assist in the
event of any subsequent servicing or maintenance.
3.5 To obtain optimum performance a ow restrictor (isolating ball valve) must
be tted where shown (see gure 3). This provides temperature control during
comissioning (see 5.3 SETTING FLOW RATE).
3.0 SITE REQUIREMENTS
A - OUTLET VALVE
B - FLOW RESTRICTOR
C - POWERPACK
D - EXPANSION RELIEF VALVE
E - SERVICES STOP VALVE
F - PRESSURE REDUCING VALVE
(2.5bar PRV SUPPLIED WITH 7kW
HEATER MUST BE INSTALLED)
A
B
C
D
E
Figure 3
F
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