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SECTION 3: C
RITICAL
 C
ONSIDERATIONS
3
SECTION 3: CRITICAL CONSIDERATIONS
3.1 Basic Information
The CTUD heater that forms the heating section of 
the DualAir
®
 unit has an automatic ignition burner 
and may be operated as fully modulating or ON/OFF 
operation.
The standard unit has the air flow from left to right 
when viewed from the controls side.
A special order version with the opposite air flow is 
available where the combustion air intake and flue 
will be at the front of the unit.
3.2 Location and Suspension
All models:
• Must be installed indoors.
• Must be installed in a level position.
• May be mounted on the floor or on a shelf of 
non-combustible material. (See Page 5, Section 
4
 and Page 9, Figure 3 for support points)
• May be suspended from above (See Page 9, 
), on the floor, or from wall brackets of 
sufficient strength to support the DualAir
®
 unit as 
listed in the Dimension Data Tablon Page 6, 
Section 4.2
. Drop rods must be a minimum of 12 
mm diameter mild steel. Six suspension points  
are located on top of the DualAir
®
 unit. 
• Must be installed in a manner which allows the 
hinged door to be fully opened to provide access 
to all serviceable components.
3.3 Minimum Required Installation Clearances
Clearances around the DualAir
®
 unit and flue must 
access for servicing, and correct operation.
3.4 Clearances to Combustibles
Clearances must be as indicated on Page 4, Figure 
2
. If no clearances to combustibles are indicated, 
then installation clearances apply.
3.5 Ventilation
It is important to ensure that there is adequate air 
circulation around the DualAir
®
 unit to supply air for 
combustion, ventilation and distribution in 
accordance with local and national codes.
3.6 Gas Supply
It is important that the gas supply pipe is sized 
correctly to provide the inlet pressure as stated on 
the heater data plate. The gas supply pipe and 
electrical connections must not support any of the 
heater's weight. 
3.7 Electrical Supply
A permanent 400v 3ø 50Hz electrical supply is 
required at the main electrical terminals. The heater 
also requires suitable energy controls in accordance 
with Section 10.
3.8 Flue 
Choose a location to allow for the proper alignment 
of the flue. Each DualAir
®
 unit must be fitted with an 
individual and correctly sized sealed flue system 
(See Page 10, Section 6). 
No other appliance may be connected to the flue. 
For room-sealed installation, the air intake must be 
the same size sealed system and the flue/air intake 
must terminate at an approved concentric wall or 
roof terminal.
3.9 Coil Condense Drain
The cooling coil must be fitted with a suitable 
condense drain. The condense pipe work should be 
in plastic or copper piping in accordance with the 
latest revision of applicable standards and local and 
national codes.
Figure 1: Condense Drain
Failure to install the condense drain correctly may 
cause water carry over into the fan compartment, 
which may then escape and cause property 
damage.
100 mm min.
Install to Suitable Drain
Drain to Open Funnel
Trap must be filled with
water to be effective and
prevent air being drawn
backwards into the drip tray.