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ENTHALPY
CONTROL
R1 MIXED AIR SENSOR
BLOWER MOTOR
HEAT
SECTION
SUPPLY AIR SENSOR
FIGURE 25
An optional IAQ sensor (A63) may be used to lower oper-
ating costs by controlling outdoor air based on CO2 level
or room occupancy (also called demand control ventila-
tion or DCV). Damper minimum position can be set lower
than traditional minimum air requirements; dampers open
to traditional ventilation requirements when CO2 level
reaches DCV (IAQ) setpoint.
Refer to instructions provided with sensors for installation.
ECONOMIZER - HORIZONTAL
(FIELD-INSTALLED OPTION)
B7
DAMPER
MOTOR
A6
BLOWER HOUSING
R1 MIXED AIR OR
FIGURE 24
S175 OUTDOOR SENSIBLE SENSOR
DOWNFLOW
HORIZONTAL
A6 Enthalpy Control LEDs
A steady green Free Cool LED indicates that outdoor air is
suitable for free cooling.
When an optional IAQ sensor is installed, a steady green
DCV LED indicates that the IAQ reading is higher than
setpoint requiring more fresh air. See figure 27.
Page 46
S175
FIGURE 26
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