RHC 8000 EN April 2019 D301207 Issue C
Page 35
10. User Operating
Instructions
How the air heater works:
Gas is burned by an atmospheric burner
that fires into a heat exchanger. The gas
burner is controlled by a double gas valve
via an electronic burner control, which is
actuated automatically via external controls
i.e. a room thermostat and/or a time switch.
The burner is ignited by a spark igniter.
When the burner fires and warms the heat
exchanger, the heat is sensed by a thermally
actuated fan control which switches on the
fan (in case there is no constant running
fan) when the air temperature has reached
its preset operating level.
At the end of a heating cycle the burner
is switched off, the air circulation fan will
continue to run until the air heater has
cooled to a safe condition. There after the
fan will remain off until the next cycle is
initiated.
Safety:
1. Flame failure is detected by the ionization
probe which is the sensor and will
immediately result in gas valve shut down.
2. Safety against overheating is assured
by two overheat controls. The first is an
automatic recycle control which protects
against low air flow i.e. clogged air ways,
fan failure etc.
The second, which is set to a higher level
than the first one, is a control which locks
out and switches off the burner in the event
of gross overheating for any reason.
Manual intervention is necessary to reset
this control device. Resetting of the
automatic burner control may also be
required.
To light the 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 a
‘ON’ cycle.
4. Adjust control/room thermostat to
desired temperature.
5. Air heater will light automatically when
the room thermostat calls for heat after +/-
30 sec.
6. If the appliance does not light:
a) check that the burner control does not
require resetting. An indicator light glows at
the back panel of the appliance and on a
remote control if fitted. Reset by pushing
reset/button on appliance or the remote
control.
b) check if thermal overheat control requires
resetting
7. If the thermal overheat control requires
resetting and doing so restarts the air
heater, wait until the appliance warms to
thermal equilibrium, to ensure the overheat
control does not lock out again.
If it does and the return air temperature
near the heater is less than 30°C, then
switch off the appliance and call for service.
If the return air temperature is over 30°C,
take appropriate action to reduce the
ambient temperature near the air heater.
Air circulation
:
The space heating process is for air to be
circulated through the appliance whereby
it gains heat from a heat exchanger. The air
is directly discharged into the space to be
heated. The air is eventually recirculated.
Therefore it is very important that an
unobstructed path for the circulation of the
air will be maintained.
Maintenance
:
Maintenance and service must only be
carried out by appropriately qualified
persons.
It is in your interest to ensure proper
service and maintenance is carried out at
a regular basis. Periods between service
Summary of Contents for Reznor RHC DJL 8000
Page 2: ......
Page 41: ...RHC 8000 EN April 2019 D301207 Issue C Page 39...
