COMBAT CUHA - Siting of Combat Control Consoles or Room Thermostats; Remote Controls; Burner Controls; Fan Controls

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UNIT HEATER
3.9 Remote Controls
Burner Controls
The heaters are designed to be operated by controls installed remote from the heater. Any controls
intended to operate the burner must be voltage free contacts connected between terminals 2 & 3 of the
main terminal block on the side of the heater.
Fan Controls
The fan is designed to operate automatically providing there is a constant 230v supply to the main
terminals. However, a switch wired between terminals L & 1 in the terminal block at the side of the
heater will provide for summer running of the fan/s.
It is acceptable for the fan to operate continuously from an external control, with the burner cycling on
and off, providing that the fan run-on at close down is not impared.
3.9.1 Siting of Combat Control Consoles or Room Thermostats
The Combat control consoles or room thermostats should be mounted on a wall or column at a height
of approximately 1.5 metres from the floor of the building being heated. It is important for both
comfort and fuel economy that the control or thermostat is sited where it will monitor an average room
temperature i.e. keep clear of cold draughts from doors, windows etc., similarly it should be kept out
of the direct path of warm air from the heater. Areas of little air movement e.g. corners, should also be
avoided.
Where CD100 type controls are fitted these also need to have the same constant 230v 50Hz.
An isolator with a contact separation of at least 3 mm on all poles should be installed adjacent to,
but not fixed to the heater to disconnect all supplies to the heater and where necessary to isolate any
remote control.
The final connection to the heater should be made in metal sleeved flexible cable or flexible conduit
to the main terminal block on the side of the heater using 1 sq. mm cable on all models.
A fuse size of 5 Amp must be used for all models CUHA and CUHA/A up to and including model
240, and 10 Amp for all remaining CUHA , CUHA/A ,CUHB, CUHC,CUHB/A and CUHC/A
models except for models CUHB… CUHC … 340 and 380 where the fuse size should be 20 Amp.
CUHD and CUHD/A models must have the external fan, or its control connected to Terminal 1 so
that the fan run on function at close down operates correctly.