Page No 22 of 56 Reznor, RHC21 4000 Installation EN May 2021 D301334 Issue 0
5 Commissioning and testing
RHC21 4000 heaters must be
commissioned before putting into
service.
Commissioning and testing must only be carried
out by suitably trained and qualified personnel.
This section should be read and fully understood
before commencing commissioning and testing
.
5.1 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 that electrical cables/wiring do not
touch the ‘hot’ combustion collector box or
flue and fix them on the gas pipe;
• Check that all wiring is connected in
accordance with the appliance circuit
diagram;
• Ascertain 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
+ 0V 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 a suitable thermostat or control
panel has been fitted;
• Ensure that an electrical isolator with two
pole separation with a minimum air break
between poles of 3.0 mm has been fitted
adjacent to the air heater.
5.2 Gas connection
Gas service connection Rc 1/2 for model RHC21
4024-05, Rc 3/4 for models RHC21 4036-08,
4050-06, 4060-07, 4075-09 and 4100-12
and Rc 11/4 for models RHC21 4125M15 and
4150M18.
Only persons formally qualified to work on gas
fired apparatus may carry out commissioning
and testing. The whole of the gas service
installation including the meter must be
inspected, tested for soundness and purged in
accordance with appropriate requirements by a
qualified person.
Never use a flame for checking gas
soundness
5.3 Pre-start checks
Prior to starting up the unit, carry out the
following checks:-
• Do not use this appliance if any part has
been subjected to water ingress. Immediately
call a qualified service technician to inspect
the appliance and to replace any part of the
control system and any gas control.
• Check gas pipework for leaks and correct
gas line pressure.
• Purge gas lines of trapped air.
• Check electrical wiring and ensure that
wiring conforms to the wiring diagram. Be
sure that all cables are correctly sized to
meet the requirements of the units.
• Verify that the appliance is earthed by
conducting an earth continuity test.
• Ensure that fuses are of the correct rating
and fuse value.
