0108MLOOGBEN
19
SECTION 13 USER INSTRUCTIONS FOR OPERATING AND LIGHTING
NOTE: Please keep a copy of this document near your air
heater!
13.1
Your Reznor ML series air heater was intended to
be installed,commissioned and tested in accordance
with these manufacturer's written
recommendations.
13.2
In the interest of safety and user satisfaction it is
important that this document is read and
understood. If in any doubt, consult your installer
or your local gas regional supplier.
13.3
It is in your interest to ensure proper service and
maintenance is carried out on a regular basis.
Reznor suggests at least once a year.
13.4
In the event of difficulties in resolving any of these
matters, please do not hesitate to contact Reznor
or their official distributor.
13.5
About your air heater:
13.5.1 Reznor ML series air heaters are "state of the art"
gas fired appliances and incorporate an atmospheric
burner which can use air for combustion from
outdoors provided the combustion air inlet is
ducted. This is identified by 2 round pipes/ducts
being connected to the rear of the air heater.
Products of combustion are vented to outdoor
atmosphere via
permanently connected forced
draught flue.
13.5.2 This heater has not been designed for use with air
distribution ducting to provide heat for more than
one room.
13.5.3 The location of the air heater should be maintained
at normal atmospheric pressure. Changes to the
building after air heater installation should have
regard to the heating installation, i.e. structural
changes causing excessive draughts from doors,
windows. Other air handlers and installation of air
extraction equipment which may cause a negative
pressure environment which can seriously affect
the operation of this type of air heater. Especially
if combustion air supply is unducted.
13.5.4 The space heating process using Reznor ML series
air heaters is for air to be circulated through the
appliance whereby it gains heat from a heat
exchanger, which is directly discharged into the
space to be heated.The air is eventually recirculated
through the appliance, thus an unobstructed path
for the circulation of the air must be maintained.
This is particularly important if the air heater has
been installed to blow through the wall between
two rooms.
13.6
How the air heater works:
Gas is burned at an atmospheric burner which fires
into a multiplex combined combustion/heat
exchanger. The gas burner is controlled by a double
gas valve via an automatic electronic burner
control, which is switched via external controls i.e.
a room thermostat and or a time switch.
Reznor ML air heaters incorporate a hot surface
ignition device and is protected by electronic flame
sensing. Safe operation of the air heater
operation is automatic following the dictates of
the external timing and temperature controls.
Safety against overheating is assured by the
inclusion in the controls circuit of two thermal
overheat controls. There is an automatic recycle
control which protects against low air flow i.e.
clogged air ways, fan failure! The second control
being a super overheat control which locks out
and switches off the burner in the event of
gross overheating for any reason. Manual
intervention to reset is necessary should the
super overheat operate. Resetting of the
electronic burner control may also be required.
When the main burner fires and warms the heat
exchanger, the heat is sensed by a thermally
actuated fan control which switches the fan on
when the air temperature reaches approximately
45
°
C. At the end of a heating cycle when the
burner is switched off, the air circulation fan will
continue to run until the air heater has cooled to
a safe condition. Thereafter the fan will remain
off until the next cycle is initiated. Should
residual heat within the appliance or high
ambient temperature in the vicinity of the
appliance exist then, the fan will run
automatically to maintain the appliance in a cool
condition.
13.7
To light the air heater:
1. Turn on the gas supply to the air heater;
2. Switch on the electricity supply to the air
heater;
3. Ensure time switch if fitted is set to an ON
cycle;
4. Adjust control/room thermostat to desired
temperature;
5. Air heater will light automatically when the
room thermostat calls for heat;
6. If the air heater does not light:
a) Check that the burner control does not require
resetting. An indicator light glows on the air
heater and if fitted the remote control panel
when in lock out condition press & release to
reset.
b) Check at the air heater if the thermal overheat
(limit) control requires resetting refer figure
12
NB:
If a remote control reset is not fitted as
described in (a) above, check and reset if
necessary the reset burner control on the air
heater.
To turn off the air heater for short periods:
1) Adjust room thermostat to lowest setting.
To
turn off the air heater for a prolonged period:
2) Carry out operation 1 above and wait five
minutes and then switch OFF the main
