MULTIPOINT 30/50
7
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 requirements 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 terminal 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 under-
side 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.
7.10 Setting the hot position:
Rotate the thermostat knob to mid way through the hot graduated range (red
graphic). Follow the procedure detailed above, however in this case the knob
should be held in the hot position previously set. When the terminal cover has
been refitted the thermostat will be locked in the hot position. This position is
recommended when using the heater in conjunction with a thermostatic blending
valve.
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.
