Section 1 - Ventilation
9 Honeywell Economizers 63-8594-02
Air Handler Control Loops
There are typically four sections of an air
handler. The Mixed Air Section is where
return air and outside air are combined
(mixed). Note some systems’ fans may be
100% return air or 100% outside air and will
not have a mixed air section.
The Conditioning Section commonly
contains filtration, heating, cooling and
humidification. The filters and heating and
cooling coils are located in the conditioning
section of the air handler.
In the Fan Section on the air handler shown
there is a supply fan. On other air handlers
there may be a return or exhaust fan. The
supply fan on this unit is referred to as a pull-
through because it is located on the outlet of
the coils. If it were located in front of the coils
then it would be a push-through fan.
The Terminal Section is composed of all the
components between the central fan and the
zones.
MIXED AIR
SECTION
O.A.
FILTERS
EX.
AIR
DAMPER
DAMPER
M23889A
DAMPER
RETURN AIR
FROM ROOM
HEATING COIL
CONDITIONING
SECTION
FAN
SECTION
TERMINAL
SECTION
SUPPLY
AIR TO
BUILDING
MIXED
AIR
COOLING COIL
FAN
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