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COMBAT
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CTCU UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL
18
SECTION 11: USER INSTRUCTIONS
11.1 User Instructions
The CTCU heaters are fully automatic and operate
from the external controls fitted on site.
The only user controls at the heater are the:
Burner Lockout
Reset Button ................See Page 18, Section 11.3.3
Limit Thermostat ResetSee Page 18, Section 11.3.2
11.2 Heater Operation
When the heater has been switched on by the
remote controls installed on site, the main burner will
automatically turn on.
The burner control box will control the safe ignition
of the flame.
All heaters require a constant gas and electricity
supply which must not be interrupted during the
normal operation of this heater.
Figure 11: Heater Operating Sequence
11.3 Common User Controls
11.3.1 Fan Thermostat
The fan thermostat is located inside the access door
at the top of the heater. See Page 28, Section 15.3.
This control ensures the heater does not blow cold
air in the normal heating cycle.
11.3.2 Limit Thermostat
The limit thermostat is located inside the access
door of the heater. See Page 28, Section 15.3. This
control protects the heat exchanger against
overheating.
11.3.3 Burner Lockout Reset Button
The red warning light on the back of the heater will
illuminate when the control has gone to lockout. This
may be caused by flame failure. Press the reset
button on the back of the heater (See Page 5,
Section 4.1) or the remote reset if installed on site.
11.4 Lighting Instructions
11.4.1 To Turn On Heater
1. Ensure that the electrical and gas supplies to
the heater are on. Check that the on site con-
trols are “ON”.
NOTE: The thermostat setting must be above the
ambient temperature for the heater to operate.
2. The automatic firing sequence will begin as
described on Page 16, Figure 9. The heater will
now operate automatically under the control of
the on site controls. Following long shut down
periods, the control may go to lockout. See
Page 18, Section 11.3.3.
WARNING
Electrical Shock Hazard
Disconnect electrical power before servicing.
Failure to follow these instructions can result in
death or electrical shock.
ON
RUN ON
CLOSE
DOWN
THERMOSTAT
CALL FOR
HEAT
BURNER
RUN
FAN
2-3 MINUTES
ON
ON
Press to reset
These are hand reset devices to give further
protection against fan failure.
NOTE: To reset, the heat exchanger must be cool.
Description Part Number
Limit Thermostat 90412100
WARNING
Explosion Hazard
If control locks out, do not make more than 3
attempts to restart the heater.
Dangerous gas mixtures can build up.
The fault must be
traced and repaired by a
registered installer or service engineer.
Failure to follow these instructions can result in
death, injury or property damage.