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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
LCSA-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.
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.
6.4.2 To turn the air heater "OFF" for short
periods
Adjust the room thermostat to its lowest setting or
'OFF'. The fan will continue to run to cool the heater
and then switch OFF automatically.
6.4.3 To turn the air heater "OFF" for long
periods
Adjust the room thermostat to OFF or its lowest
setting. When the fan has stopped, turn OFF the gas
supply and then switch OFF the electricity supply to
the air heater.
6.5 Air heater gas pipe work
The soundness of the air heater pipe work has been
checked prior to leaving the factory. However during
installation, connections may have been loosened.
Check the soundness of the appliance pipe work
using a soapy solution. If any leaks are found they
must be rectified immediately.
Never use a flame for checking gas
soundness.
6.6 Adjustments
6.6.1 Burner gas pressure adjustment
The gas pressure is set for the required heat input
before the appliance leaves the factory. Provided
the gas supply to the air heater is in accordance
with the supply pressure described on the appliance
data plate the operating pressure will not require
adjustment. To check the pressure, the following
procedure should be carried out:
* Ascertain from section 1 of this document and
the appliance data plate the correct operating
gas pressure for the air heater;
* Turn the room thermostat control to its lowest
setting;
* Remove the screw from the burner pressure test
point of the multi-functional control valve.
Connect a manometer to the test point( see
figure 7);
* Adjust the room thermostat to call for heat e.g.
above room ambient temperature;
* Observe the burner gas pressure on the
manometer and compare to the required
pressure;
* If necessary, adjust the burner gas pressure
(only for natural gas). Remove the cover screw.
Turn the regulator screw anti-clockwise to
decrease pressure or clockwise to increase
pressure (see figure 7);
* Set room thermostat to lowest setting to turn the
burners OFF. Replace the test point screw (if
removed) and with the main burner alight, test
for gas soundness using a soapy solution.
Reset temperature control/room thermostat to
comfort operating level.
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