exception to this
is when a
control panel
suitable for
multiple heater
applications is
supplied by the
manufacturer.
Any ancillary electrical items e.g. room
thermostats , time switches, remote panels
etc, must be wired into the heater electrical
circuit in accordance with the diagrams
provided
Note
When external controls operate to switch the
heater
OFF
, power to the heater should
remain to allow the fan to continue to operate
to sufficiently cool the heater thereby
preventing damage to the heat exchanger.
Fan limit control
( Situated inside the right hand side panel)
FAN ON 50
c
FAN OFF 30
c
These settings may require slight adjustment
on commissioning
Fan control
(white button)
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 heat
anticipator has closed the fan switch contacts.
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
Limit control
(red button)
SET at 100
c
An adjustable high temperature manual reset
limit control. If this control needs resetting the
cause should be determined and rectified
immediately.
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. On larger
models there will be additional limit stats fitted
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 Variante 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.
