Section 2 - Enthalpy Theory And Controllers
63-8594-02 Honeywell Economizers 30
Enthalpy Control with Carbon Dioxide Sensor
Most building codes allow for the option of
carbon dioxide sensor-based demand control
ventilation (DCV) to determine the human
occupancy level of the space. Honeywell
supplied controllers that combined this
function with the economizer function. They
were the W7212, W7340, W7460, and the
W7215 economizer logic modules. All of these
logic modules had inputs for a room indoor air
content sensor. Additionally the W7215B was
available with outdoor air content sensor
inputs. The W7215 and W7212 were designed
to be used with series 72 actuators and the
W7460 with the M7415 actuator. The W7340
was designed to be used with an OEM system
because it requires external relays to switch to
compressor and communicates with the OEM
system controller via a modified modbus
protocol. In addition to the indoor sensor
based demand control ventilation option,
these logic modules had additional features
including:
• Maximum damper position adjustment
(DCV max).
• Exhaust fan setpoint.
• Occupied and Unoccupied operation.
• W7213 and W7214 are heat pump models.
The JADE
TM
controller replaced the analog
economizers in new applications. The JADE
TM
is a digital economizer and incorporates many
features and functions that were not availably
on the analog sensors. See section 11 for the
JADE
TM
controller.
DAMPER
M23905A
DAMPER
RETURN AIR
FROM ROOM
RETURN
AIR SENSOR
SUPPLY
AIR TO
BUILDING
FAN
COILS
W7212 ECONOMIZER
CONTROLLER
WITH DEMAND
CONTROL
VENTILATION
C7632 ROOM
CARBON DIOXIDE
SENSOR
TB8220
COMMERCIAL
PRO
S
+
S
+
DIFFERENTIAL ENTHALPY WITH DCV
OUTSIDE
AIR SENSOR
EXHAUST
AIR
MIXED OR
SUPPLY AIR
SENSOR
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