COMBAT
®
CTU UNIT HEATERS INSTALLATION OPERATION AND SER VICE MANUAL
20 of 46
SECTION 11: WIRING AND ELECTRICAL INFORMATION
11.1 Electrical Supply
All heaters need a constant 230 V 50 Hz single
phas
e supply connected to terminals L, N & Earth.
Polarity "L & N" must
be correct. The voltage
between neutral and earth should be 0 and never
exceed 15 volts.
All heaters and controls mus
t be correctly earthed.
All external wir
ing must conform to "HAR"
(harmonised wiring code) HOSVV-F (Polyvinyl
Chloride Cord).
External controls must
have the same constant
230 V 50 Hz suppl
y.
An isolator wi
th a contact separation of at least
3 mm on all poles mus
t be installed adjacent to, but
not attached to, the heater to disconnect all supplies
to the heater and any remote control.
The final connection to the heater shoul
d be made
by flexible cable or conduit to the main terminal
block on the inside of the heater using 1 mm
2
cable
on all models.
Models ............................................ Fuse Size
CTUA (All Models) ........................................... 5 A
CTUB & CTUC (Models 75 - 115).................. 20 A
CTUD heaters must
have the external fan, or its
control connected to Terminal 1 so that the fan run-
on function at close down operates correctly.
1
1.2 Remote Controls
The heater is designed to be operated by controls
installed remote from the heater. See Page 21,
Section 11.3.
11.2.1 Burner Controls (Thermostat)
Controls to operate the burner must be voltage free
contacts connected between terminals 2 & 3 of the
main terminal block.
11.2.2 Positioning Room Thermostats or
Combat
®
Control
A room thermostat or Combat
®
control should be
mounted on a wall or column at a height of
approximately 1.5 metres from the floor to measure
the ambient temperature. It should be clear of both
cold draughts and the direct path of warm air from
the heater.
11.2.3 Remote Frost Thermostat
When required, connect to terminals 2 and 3 in the
main terminal block.
Locate within the heated space adjacent to the most
vulnerable equipment that requires protection.
See Page 21, Section 11.3.
11.2.4 Remote Fan Controls
The fan will operate automatically providing there
is a constant 230 V supply to the main terminals.
A switch or control wired between terminals L & 1 in
the terminal block will allow external control of the
fan(s).
The fan may be controlled 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 impaired.
DANGER
Electrical Shock Hazard
Disconnect electric before service.
Heater must be properly grounded.
Failure to follow these instructions can result
in death or electrical shock.
To Next Page
Loading...
