Heatrae Sadia UTC 99 Fitting Instructions And User Manual page 5

When installed as a Cistern Fed water heater, the cold water supply
must be from a feed cistern complying with Water Byelaw 30.
A vent pipe must be connected to the outlet of the heater. The vent
pipe must rise continuously and be arranged to discharge into the
cold water feed cistern.
The vent pipe must have a minimum bore of 19mm.
3.1.5 National Wiring rules may contain restrictions concerning the installation
of these units in bathrooms.
3.1.6 The installation must be carried out in accordance with the relevant
requirements of:
• The appropriate Building Regulations either The Building
Regulations, The Building Regulations (Scotland) or Building
Regulations (Northern Ireland).
• The Water Fittings Regulations or Water Byelaws in Scotland.
LOCATION
3.1.7 The unit should be vertically wall mounted using the wall bracket
provided. Alternatively, it can be floor mounted on its base. The water
connections must always be to the top of the unit.
3.1.8 Enough space should be left at the top above the unit to allow for pipe
connections. Refer to Fig. 01 to determine a suitable position for the
heater.
3.1.9 Ensure that the wall can support the full weight of the unit (see Technical
Specification) and that there are no hidden services (gas, water or
electricity) below the surface of the wall.
3.1.10 The unit should be fixed to the wall using No. 12 screws into suitable
wall plugs.
3.2 PLUMBING
3.2.1 DO NOT install where the unit may freeze.
3.2.2 Refer to the section IMPORTANT INSTALLATION POINTS to determine
which valves and accessories are required.
3.2.3 The water connections are 15mm diameter copper tube suitable for
compression fittings. Do not use solder joints as this will damage the
heater.
3.2.4 The inlet is marked BLUE and the outlet is marked RED. It is
recommended to fit a WRAS listed isolating valve on the cold water
inlet to simplify servicing.
OPEN OUTLET INSTALLATION
3.2.5 When installed as an open outlet water heater, the outlet acts as
a vent and must not be connected to any form of tap or fitting not
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