17
If the Nordair Niche IDF unit is fitted with indirect
gas fired heat exchanger(s). The attached
instructions must be read and understood prior
to commencing work and must be followed for all
commissioning and service operations.
Note: Outdoor commissioning work on Nordair
Niche appliances should not be undertaken
during wet conditions, a second person should
always be available to provide assistance in the
event of an emergency.
Only persons formally qualified to work on gas
fired apparatus may carry out commissioning
and testing.
Electrical check
After completion of the installation and before
switching on the electrical supply to the
appliance, a qualified electrician must carry out a
preliminary check. The following must be
checked:
• Check to ensure that electrical cables/ wiring
do not touch the hot combustion collector box.
• Check that all wiring is connected in
accordance with the appliance circuit diagram.
• Be certain that the correct fuse value and cable
size has been provided.
• Check to ensure that the appliance is earthed
by conducting an earth continuity test.
Connect a test meter, one lead to the
appliance earth terminal and the other to the
mains incoming earth point at the electrical
isolator. A resistance reading of 1,0 ohm or
less must be indicated. If a higher reading is
obtained, check all cable connections to ensure
adequate security and cleanliness. If problem
still exists, it may be necessary to consult the
electricity supply undertaking.
• Carry out a polarity test. Connect one lead of
a suitable AC voltmeter to earth and connect
the other lead to the live supply terminal (L) at
the air heater. Switch ON the power to the air
heater and check for correct voltage. The same
result should be obtained by connecting the
test leads between live and neutral. Connect
the voltmeter test leads to N and E. A reading
of ± OV should be obtained. If these tests do
not conform with the above, there is a fault
which must be rectified before proceeding
further with the commissioning.
•
Check that all sensors have been fitted in
accordance with the supplied wiring dia-
gram.
•
Avoid location in draughty areas or where it
may be influenced by heat sources e.g, the
sun, process plant, etc. The thermostat or
temperature sensor should be mounted on a
vibration free surface and mounted about 1.5
metres above floor level.
Gas connection
The whole of the gas service installation
including the meter must be inspected, tested for
soundness and purged in.
Caution: Never use a flame for checking gas
soundness.
6. Commissioning & Testing