Page 33
FIGURE 26
ECONOMIZER
ACCESSORY
PANEL MULLION
DIVIDER PANEL
(Attach with two
provided screws)
BOTTOM OF
COMPRESSOR
SECTION
FLANGED
RETURN AIR
OPENING
ECONOMIZER
E-K1ECON20B Economizer
(Field- or Factory-Installed)
Economizers use outdoor air for free cooling when temper
ature and/or humidity is suitable. See figure 26.
The mixed air temperature sensor (R1) measures the sup
ply air sensible temperature. See figure 27. The outdoor air
sensible control is the default economizer control. An out
door air single sensible sensor, S175, is also provided. See
table 14 for outdoor and return air (OA and RA) sensor op
tions. Refer to instructions provided with sensors for instal
lation.
An IAQ sensor is used when demand control ventilation
(DCV) is specified. Damper minimum position can be set
lower than traditional minimum air requirements resulting in
cost savings. The IAQ sensor allows the A6 to open
dampers to traditional ventilation requirements as room oc
cupancy (CO
2
) increases.
TABLE 14
Sensors
Dampers will modulate to 55°F
discharge air (RT6) when:
Single OA Sensible
OA temperature (S175) is lower
than free cooling setpoint.
Single OA Sensible
OA temperature and humidity (A7)
is lower than free cooling setpoint.
Differential Enthalpy -
1 in OA and 1 in RA
OA temperature and humidity (A7)
is lower than RA temperature and
humidity (A62).
IAQ Sensor
CO
2
sensed (A63 ) is higher than
CO
2
setpoint.
FIGURE 27
MIXED AIR SENSOR (R1) LOCATION
R1 MIXED
AIR SENSOR
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