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CTU UNIT HEATERS INSTALLATION OPERATION AND SERVICE MANUAL
28
SECTION 12: USER INSTRUCTIONS
12.1 User Instructions
The CTU 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 28, Section 12.3.2
Thermostat Limit Thermodisc Reset Button:
See Page 28, Section 12.3.1
WARNING
Electrical Shock Hazard
Disconnect electrical power before servicing.
Failure to follow these instructions can result in
death or electrical shock.
12.2 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 13: Heater Operating Sequence
ON
RUN ON
CLOSE
DOWN
THERMOSTAT
CALL FOR
HEAT
BURNER
RUN
FAN
2-3 MINUTES
ON
ON
12.3 Common User Controls
12.3.1 Thermostat Limit Thermodisc
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
All Models 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.
12.3.2 Burner Lockout Reset Button
The red warning light at the front 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.
12.4 Lighting Instructions
12.4.1 To Turn On Heater
1. Ensure that the electrical and gas supplies to
the heater are on. Check that the on site
controls are “ON”.
NOTE: The thermostat setting must be above the
ambient temperature for the heater to operate.
2. The green light will be on and the automatic fir-
ing sequence will begin as described on Page
25, Figure 10. The heater will now operate auto-
matically under the control of the on site con-
trols. Following long shut down periods, the
control may go to lockout.
See Page 28, Sec-
tion 12.3.2.