10
` Setting the “mid-range” position:
Rotate the thermostat knob to the mid position.
Remove the terminal cover by using a large
at bladed screwdriver to depress the three
snap lugs located in the three top rectangular
depressions. 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 ret to the knob
ensuring the notch locates with the boss on the
underside of the cover. Ret the terminal cover,
the thermostat will now be locked in the “mid-
range” position.
` 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 retted the thermostat will be locked in
the “hot” position. This position is recommended
when using the heater in conjunction with a
thermostatic blending valve.
` Water may drip from the discharge pipe of the
pressure relief device - this pipe must be left
open to atmosphere.
7. Commissioning
7.1 General
After lling the installation with water in the previous
section please follow the following steps to complete
the installation of the product.
WARNING
DO NOT switch on the product until it has
been lled with water.
7.2 Checklist before commissioning
` Check all water connections for leaks and rectify
as necessary.
` Check that all installation, electrical and
discharge pipe requirements have been met.
` Check that electrical connections are tight.
7.3 Commissioning procedure
` Open a hot water tap, turn on mains water
supply to the product.
` Allow product to ll and leave hot tap running
for a short while to purge any air and ush out
the pipework. Close the hot tap and check the
system for leaks.
` Manually test the operation of the Temperature/
Pressure Relief Valve and, if tted, the Pressure
(expansion) Relief Valve. Ensure water ows
freely from the valve(s) and through the
discharge pipes.
` Switch on the electrical supply. The indicator
light will illuminate during heating. When the set
temperature is reached, the indicator light will go
out.
` 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. Always switch off the electrical
supply before removing the terminal cover.
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