D
UAL
A
IR
®
H
EATING
AND
COOLING
U
NITS
I
NSTALLATION
O
PERATION
AND
S
ERVICE
M
ANUAL
24
Pressure Switch
The pressure switch is factory pre-set for each
model and is not adjustable.
11.6 Turning Off the DualAir
®
Unit
Set the external controls to the off position and the
main burner will stop.
The fans will run until they are stopped automatically
by the fan thermostat.
Do not use Electrical Isolator for control of
heater. Electrical Isolator will switch off the fan.
Heat exchanger could be damaged. Warranty will
not cover damage to the heat exchanger if
operated improperly.
11.7 External Controls
External Controls may include time switch, room
thermostat and frost thermostat. Operate each
control to ensure that they function correctly. Set the
time switch (if fitted) and room thermostat to the
users’ requirements. Operate the external controls
and ensure that the installed cooling stages operate
correctly as described
on Page 17, Section 10.3
.
11.8 Complete the Commissioning
Ensure that all covers are fitted correctly and all test
points are properly sealed.
11.9 Instruction to the User
Explain the controls of the DualAir
®
unit to the user
including how to turn it on and off, using the controls
fitted on site.
Give this manual to the user.
Ensure that the user is shown and understands the
importance of maintaining clearances to
combustibles and the user instructions
on Page 25,
Section 12
through Page 26, Section 12.6
and all
warnings defined in this manual.
