Operation; Applicable Wiring Diagrams - Honeywell W7212 Product Data

W7212, W7213, W7214 ECONOMIZER LOGIC MODULES
Actuator
Honeywell MS7XXX Single
Single or Differential
Honeywell M7215 Single
n/a n/a
Honeywell Series 72 Single or Differential
Honeywell M7215 Single or Differential
Honeywell M7215 Single or Differential
Honeywell M7215 Single or Differential

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.
63-2596—09
Table 2. Applicable Wiring Diagrams.
Enthalpy Changeover
Single-stage cooling system.
Two-stage cooling system.
Two-stage heat pump system.
Direct mount Logic Module to Motor and
T7300 thermostat.
S963 remote damper control.
Honeywell Series 72.
With T7300 thermostat
With T7350 thermostat
With TB7220 or TB8220 thermostat
Comments
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).
6
Figure Economizer
12 W7212
13
15 W7213, W7214
9 W7212
6
14 W7212
9 W7212
10
11