Nortek Reznor VRA-4E Series, Установка, пусконаладка, обслуживание

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1712VRA ‐ 4EGBEN, pag.. 11/25
COMMISIONING/TESTING
The commissioning and testing may only be
carried out by appropriately qualified persons.
This section should be read and fully understood
before commencing commissioning and testing.
6.1 Electrical check
After completion of the installation and before
switching on the electrical supply to the
appliance, a preliminary check must be carried
out by a qualified electrician. The following must
be checked:
*
Ensure that all cables & installer’s wiring are
fixed to the gas pipe & that they do not touch
the combustion collector box
* 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 to 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.
6.2 Gas connection
ATTENTION :
NEVER USE A FLAME FOR CHECKING GAS
SOUNDNESS!
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.
6.3 Suspension and support
Check to ensure that the air heater is adequately
suspended or supported and that no other parts
have been fitted that are not independently
supported and secured. For safe and correct
operation, check the heater is level in both
planes.
6.4 Lighting the air heater
VRA-4 air heaters are all fitted with automatic
spark ignition systems. When adequate airflow for
combustion is proven by an air proving control
and a pre-purge period has elapsed, the integral
ignitor and multi-functional gas control operate.
The ignition spark ignites the gas creating the
burner flame which is detected by a flame rod
sensor. If a burner flame is not detected, the
ignition controller proceeds to lock-out and
requires manually resetting. Lock-out is indicated
by the red warning light on the air heater. If the first
reset is not successful, wait 15 seconds before
attempting reset.
6.4.1 To turn the air heater "ON"
The following checks should be carried out before
attempting to light the air heater.
* Ensure that the gas supply to the air heater is
turned ON;
* Ensure that the electrical supply to the air
heater is switched ON;
* If fitted ensure that a time switch is set to an
ON period
* Set room thermostat to call for heat. e.g. to above
room ambient temperature. The burner will now
light.
The burners can be seen through the viewing
port.
* Adjust the room thermostat to the required
operating comfort temperature. The air heater
will now start automatically when heat is called
for by the room thermostat.
Note :
If the air heater will not start on initial start-up,
the ignition controller may be in lock-out position and
require resetting. This may occur especially if the
appliance has been on stand-by for a prolonged period.
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