![background image](http://html.mh-extra.com/html/honeywell/w7212/w7212_product-data_149176006.webp)
W7212, W7213, W7214 ECONOMIZER LOGIC MODULES
63-2596—09
6
Table 2. Applicable Wiring Diagrams.
OPERATION
The purpose of the economizer is to use outdoor air for
cooling, whenever possible, to reduce compressor operation.
Power at the N terminal determines the Occupied/Unoccupied
setting:
— W7212:
• 24 Vac (Occupied).
• No power (Unoccupied).
— See Fig. 9 through 15 for controller hookup.
NOTE: When module is operating in Occupied mode, the
minimum position is defined by the potentiometers.
When the module is operating in Unoccupied mode,
and there is no call for cooling, the damper drives fully
closed.
When wired as shown in Fig. 9 through 15, the logic module
responds to the cooling thermostat signal. The system uses
C7400 Solid State Enthalpy Changeover Sensor(s) or C7660
Dry Bulb Temperature Sensor(s). The C7400 responds to both
dry bulb temperature and humidity, allowing use of outdoor air
at higher temperatures for free cooling when humidity is low.
The C7660 responds only to dry bulb temperature; use only in
dry, arid climates and only in single dry bulb changeover. Do
not use the C7660 in differential dry bulb applications.
The logic module functions as a true first stage of cooling
providing maximum energy economy during the cooling cycle.
It automatically locks out free cooling during heating; holding
the outdoor air damper at the minimum position setting (or if
using Demand Control Ventilation and the space CO2 level is
above the set point, the damper will be between the MIN POS
and DCV MAX position).
Actuator
Enthalpy Changeover
Comments
Figure
Economizer
Honeywell MS7XXX
Single
Single-stage cooling system.
W7212
Single or Differential
Two-stage cooling system.
Two-stage heat pump system.
W7213, W7214
Honeywell M7215
Single
Direct mount Logic Module to Motor and
T7300 thermostat.
W7212
n/a
n/a
S963 remote damper control.
Honeywell Series 72
Single or Differential
Honeywell Series 72.
W7212
Honeywell M7215
Single or Differential
With T7300 thermostat
W7212
Honeywell M7215
Single or Differential
With T7350 thermostat
Honeywell M7215
Single or Differential
With TB7220 or TB8220 thermostat