Roberts Gorden DAT75, DAT90, DAT100 Department for recommendations regarding, 494425, Ducting

DUALAIR® HEATING AND COOLING UNITS INSTALLATION OPERATION AND SERVICE MANUAL

SECTION 8: OPTIONAL HEATER CONFIGURATIONS 8.1 Distribution Duct

DualAir® units are designed to be connected to	The duct must be designed as described on Page
distribution and air inlet ducting.	14, Section 8.1 and Figure 10 to ensure that there is
It is recommended that flexible duct connectors and/	a homogenous air flow across the whole heat
or attenuators are used to reduce duct born noises.	exchanger. Failure to provide a properly distributed
It is recommended that the inlet ducting is arranged	air flow will reduce the life of the heat exchanger.
with both fresh air and recirculating air dampers to	Contact Roberts-Gordon Europe Ltd. Design
take advantage of the "free cooling" stage provided.
Distribution ducting must be insulated to prevent	Department for recommendations regarding
heat gain during cooling mode.	duct resistance and design. Tel: +44 (0) 1902
The air flow must be in the direction as stated for the	494425
version being installed with the heater at the
discharge end.
Figure 10: Ducting
NOTE: Duct size will be full size of inlet and outlet.			Dimension
All joints between the heater and duct work should be			“X”
made as air tight as possible.
		*Minimum-
*Inlet Duct Minimum Dimension same as Outlet Duct
		Twice
Minimum Dimension		Dimension
		“X”
Airflow Indicator

Ducting

Flexible Flange

14