Page 47
FIGURE 49
ENTHALPY SENSOR
ALL ECONOMIZERS
ENTHALPY
SENSOR
OUTDOOR
AIR DAMPERS
DAMPER HOOD
d-Mixed Air Sensor
The sensor measures the resultant temperature of
the mixed air downstream of the evaporator coil.
The mixed air temperature is used by the enthalpy
control when outdoor dampers are open to help de
termine whether outdoor air dampers should close.
Modulating economizers are equipped with a single
mixed air sensor. Three position economizers are
equipped with a separate sensor (switch) and sens
ing bulb which are connected by a cap tube.
The mixed air sensor (bulb) is located in the supply
air stream. The sensor (modulating economizer) or
sensing bulb (three position economizer) fits
through a factory supplied hole in the panel dividing
the unit return and supply air (see figure 50). The
three position economizer sensor (switch) mounts
to predrilled holes in the unit panel dividing return
and supply air.
e-Wiring, Installation, Maintenance
The economizer uses a harness plug to connect to
the GCS16's harness connector located in the blow
er compartment. Refer to figure 51 for REMD16
installation or figure 52 for EMDH16 installation. Al
though a harness connector is used to connect the
GCS16 to the economizer, the economizer electri
cally connects to the GCS16 differently depending
on which control system has been installed. The dif
ferent electrical connections are made in relay kits
and controls located in the control area of the blower
MIXED AIR SENSOR
FIGURE 50
REMD16M and EMDH16M
MIXED AIR SENSOR
INSTALLATION
REMD16 and EMDH16
MIXED AIR SENSOR
INSTALLATION
GCS16 UNIT
SENSOR HOLE
LOCATION
CONTROL
HARNESS
CONTROL
HARNESS
MIXED AIR
SENSOR
CONTROL
HARNESS
MIXED AIR
SENSOR
CAP
TUBE
SENSOR
BULB
SUPPLY
AIR
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