User Guide

13
Reversing the Supply and Defrost Air Ports (Damper Defrost Units only- Models 455DD, 650DD,
700DD, 1200DD)
Sometimes installation is easier if the "Supply Air from
Outside" is ducted from the upper left side port (Defrost
Air) instead of the top port.
Changing the functionality of these two ports is easily
accomplished by switching the red and yellow defrost
motor wires at the circuit board. Switch T37 and T39 on
the Aircom circuit board.
Switch T37 (red wire) and T39 (yellow wire) on the Air-
com circuit board if you wish to reverse the "Supply Air
From Outside" and "Pool and Defrost Air" ports.
This illustration shows the factory configuration.
EXHAUST AIR
TO OUTSIDE
SUPPLY AIR
TO BUILDING
EXHAUST AIR
FROM BUIULDING
DEFROST AIR
SUPPLY AIR
FROM OUTSIDE