6
WATER REQUIREMENTS
3.1 All 7kW, 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. item D) 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 An isolating stop valve MUST be incorporated to the main water supply to
comply with Water Regulations.
3.5 To obtain optimum performance a ow restrictor (isolating ball valve) must
be tted where shown (see gure 3. item B). This provides temperature control
during commissioning (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
A
B
C
D
E
Figure 3
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