18
Fan Control Relay
The fan control switch features normally
open 230V contacts, and is wired to control
the live supply to the fan motor. When the
circuit is made the fan will switch on. When
the thermostat or time switch shuts down
the burner, the fan will continue to run until
the thermal switch has cooled sufficiently to
prevent the residual heat from damaging the
heater or its controls.
On start up the fan delay prevents air being
circulated until the desired temperature is
achieved. On
Limit Control
A high temperature manual reset limit
control.
On models with two fans a second limit
control is situated inside the right side panel
and is wired in series. Operation of either
switch will shut down the heater.
If these controls require resetting the cause
should be determined and rectified
immediately.
Caution
The power supply to the fan must not be
interrupted, the only time when power
supply can be disconnected or interrupted is
during servicing or in emergencies
If there is a requirement for the heater to be
switched off over night then the gas valve
circuit should be opened via a time switch,
etc, as per the wiring instructions and
diagrams supplied within section 6.0 of this
manual.
2.7 Gas installation
Warning
Please read notice on page 3 of this
manual
As there have been recorded instances of
the deposition of copper sulphide dust within
the valves and orifices of gas appliances as
a direct result of a reaction between the
hydrogen sulphide contained in some
natural gasses and copper pipe we
recommend that the heater(s) should not be
connected to any natural gas pipe
distribution system which utilizes copper
pipework, including final connections.
Instead steel pipework should be used
throughout.
In the event that it is impractical to use steel
pipework or where installers are obliged or
insist on using elements of copper pipework
within the installation then we strongly
recommend that the gas supplier be
consulted as specific conditions and
requirements may be necessary.
The LCSBD range of heaters are all
manufactured and pre set for use with
Natural Gas,or Lpg and all feature a 3/4”
BSP connection point. Prior to installation
the supply characteristics (gas type and
pressure) must be checked to ensure that
they are in accordance with the data plate
on the heater.
The gas supplier should check that the
meter and service connection to the heater
are capable of delivering the required
volume of gas, thereby ensuring that the
minimum burner pressure can be achieved.
Consideration should be given to the
pressure drop on single and multi heater
installations and the effect they may have on
other plant sharing the supply.
If it is necessary to fit a gas pressure
booster, the controls must include a low
pressure cut off switch which must be fitted
on the supply / inlet side of the booster. It is
also a requirement that the gas supplier is
advised prior to the installation or fitting of
the booster.
