0307SCA0AMEN
13/26
6.0 COMMISSIONING & 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
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.
6.2 Gas connection
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.
CAUTION: Never use a flame for checking gas soundness
.
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
SCA 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.
NOTE: 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.