Ducted Units Installation - Lennox WA Series Installation, Operating And Maintenance

3.7.7 - Air cooled condensers
An air cooled condenser connected to a unit must have the same number of circuits as the unit. Selection of the
condenser must be made carefully to enable transfer of the heat capacity of the unit even at the highest temperatures
expected on an installation.
It is mandatory to control the head pressure in order to enable the unit to operate properly whatever the season:
A variety of different systems may be used, but the most simple and efficient of these modulates fan operation using
a pressure or temperature control.
For condensers fitted with a small number of fans (1 or 2), it may be necessary to vary the fans speed.
Head pressure control systems that operate by flooding the condenser with liquid refrigerant should be avoided since
they entail very large refrigerant charges and can cause serious problems if they are not correctly controlled.

3.8 - DUCTED UNITS INSTALLATION

Notes :
- Be carefull of air cycling between inlet and outlet.
- For air outlet it is recommended to duct each fan separately.
Installation - Operation - Maintenance manual (IOM) • AIR COOLED CHILLERS & SPLIT UNITS - 1106-E
Air outlet
Air inlet
Air inlet duct
Air outlet duct
Unit
Auxiliary drip tray (heat pump unit)
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