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SECTION 12: USER INSTRUCTIONS
25
SECTION 12: USER INSTRUCTIONS
12.1 User Instructions
The DualAir
®
units 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 26, Section 12.3.3
Limit thermostat
reset...........................See Page 25, Section 12.3.1
Second limit thermostat
reset button ..............See Page 25, Section 12.3.2
12.2 Heater Operation
When the heater has been switched on by the
remote controls installed, the main burner will
automatically turn on.
The burner control box will control the 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.
12.2.1 Warning Lights
The DualAir
®
unit has three warning lights;
GREEN = Heater ON, burner attempting to fire
RED = Burner LOCKOUT, see Section 12.3.3.
AMBER = Dirty Filter, replace filter, air flow is
dropping to an unacceptably low value.
Figure 14: Heater Operating Sequence
12.3 Common User Controls (all models)
12.3.1 Combination Fan/Limit Thermostat
The Combination Fan/Limit Thermostat is located
inside the access door at the top of the heater. See
Page 37, Section 16.3.
This control ensures the heater does not blow cold
air in the normal heating cycle and protects the heat
exchanger against overheating.
Figure 15: Fan/Limit Thermostat
12.3.2 Secondary Limit Thermostat
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
ON
ON
White fan button
Pull out for normal operation.
Press in for constant fan.
Red limit reset button
(Press to reset)
The combination fan/limit thermostat is preset
during commissioning.
See Page 7, Section 4.3 and Page 8, Figure 4.4.
NOTE: To reset, the heat exchanger must be cool.
If the air flow is reduced due to power failure the
limit thermostat will cause the burner to lockout.
Description Part Number
Combination Fan/Limit Thermostat K017A
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
CTUA 40 & 50; CTUB 50 & 60 90412101
All Other 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.