Commissioning - Heatrae Sadia Multipoint 30 Installation And User Instructions Manual

6.5 Maximum total hydraulic resistance of the discharge pipe should
not exceed that of 9m of straight pipe.
6.6 Discharge pipe should have a continuous fall (minimum 1:200).
6.7 The discharge pipe should not be blocked or used for any other
purpose.
Information Sheet No. 33 available from the British Board of
Agrement gives further advice on discharge pipe installation.

7.0 COMMISSIONING

7.1 Do not switch on the electrical supply until the unit has been filled
with water and checked for leaks.
7.2 Check that all installation, electrical and discharge pipe require-
ments have been met.
7.3 Check that all water and electrical connections are tight.
7.4 Open a hot water tap, turn on mains water supply to the heater.
7.5 Allow unit to fill and leave hot tap running for a short while to
purge any air and flush out the pipework. Close the hot tap and
check the system for leaks.
7.6 Manually test the operation of the Temperature/Pressure Relief
Valve and, if fitted, the Pressure (expansion) Relief Valve. Ensure
water flows freely from the valve(s) and through the discharge
pipes.
7.7 Switch on the electrical supply. The indicator light will illuminate
during heating. When the set temperature is reached the indicator
light will go out.
7.8 The set temperature can be adjusted by rotating the knob located in
the terminal cover. It is possible to lock the thermostat knob in
either the mid-range or a "hot" position by following the procedures
in 7.9 or 7.10 below. Always switch off the electrical supply before
removing the terminal cover.
7.9 Setting the "mid-range" position:
Rotate the thermosatat knob to the mid postion. Remove the termi-
nal cover by using a large flat bladed screwdriver to depress the four
snap lugs located in the four rectangular depressions on the bottom
cover. Holding the thermostat knob in position turn the terminal
cover over and remove the backing disc from the underside of the
cover. Turn the backing disc over and refit to the knob ensuring the
notch locates with the boss on the underside of the cover. Refit the
terminal cover, the thermostat will now be locked in the "mid-
range" position.
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