page no. 4 of 68
LX Range Users, Installation & Servicing Instructions Doc Ref M110 issue 1.0 Dec 2020.
User Instructions
If the heater has not been left operational
proceed as follows.
A) Checks before operating the Air
Heater
The following preliminary checks should be made before
lighting the heater(s)
a) Ensure that the ELECTRICAL supply to the heater is
switched OFF.
b) Check that any warm air delivery outlets are open.
c) Check that the thermostat is set.
d) Check that the clock control is set to an ON period.
e) Check that any other controls are calling for heat.
B) Operating the Air Heater
1. Switch on the electrical supply at the isolator.
NOTE: If the LED on the front of the heater
pulses amber, the heater is in high limit. Refer
to D3 opposite.
2. The burner air fan will run and after a pre purge period
of approximately 20-30 seconds the ignition spark will be
generated and the main gas valve energised. The burner
will then start.
3. The main air fan(s) will commence automatically within
a maximum period of 3 minutes.
NOTE: If the burner fails to light it will go to
lockout and the LED on the front of the heater
will be solid amber. To restart press the RESET
button on the MC200.
If it is not possible to light the heater after
several attempts, contact the installer or
local service company.
C) To Shut Down the Air Heater
1) For Short Periods:
Turn the room thermostat to the OFF, or set to 'Summer
Mode'.
2) For Long Periods:
Complete step 1 above.. Wait approximately 4-5 minutes
for the main air fan of the heater to stop running and the
turn off the gas supply and electric supplies to the heater.
D) Description of Operation
Important: The heater must NOT be
controlled by switching ON and OFF the
main electrical supply to it.
1) Standard Units
The burner start up sequence will commence when the
controls e.g. Timeclock, room thermostat etc. call for heat.
The burner air fan will run and after a pre purge period of
20-30 seconds the burner will light. The heat output will
then be controlled either to high fire or low fire depending
on the requirements of the space being heated and the
external controls fitted.
Approximately 2/3 minutes after the burner lights the
heater fan will automatically start. When the external
controls are satisfied the burner will be turned off and
approximately 4/5 minutes later the heater fan will
automatically stop.
When the burners are alight, the heat output will be
controlled to any point between high and low fire;
depending on the requirements of the space being heated
and the external controls fitted.
2) Summer / Winter Modes
Certain types of external controls will provide for two
modes of operation i.e:
Summer: The heater fan alone will run at the dictate of
the external controls to provide air movement.
Winter: The heater will operate normally.
3) Limit Thermostat
This operates if high temperatures within the heater are
detected, the burner is turned off and the amber LED on
the front of the heater is pulsed. The fault condition must
be identified, rectified and the thermostat manually reset.
NOTE: Unless the cause of the fault condition
is readily obvious, for example a power cut
whilst the heater was operating, a service
engineer should be contacted. The limit
thermostat(s) can only be reset once the unit
has cooled down.
For LX15-70 units, the reset is located next to the LED.
For LX90-140 units, a single pulse denotes a high limit of
the stat closest to the burner. The reset is located next
to the LED. A dual pulse denotes a high limit of the stat
furthest away from the burner. This reset is located at the
opposing end of the heater to the burner/controls. When
the unit has cooled sufficiently, unscrew the cover cap
and the reset button is exposed. Depress the reset and
the unit is operational again.
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