Honeywell Design and Application User Manual

Section 9 - W7212, W7213 and W7214 Economizer Modules
83 Honeywell Economizers 63-8594-02
W7212, W7213, and W7214 Components
The W7212 DCV economizer logic module
was the simplest and most popular analog
economizer. It combined all of the benefits of
the W7459 and W7210 with the some features
of the W7215. It did not include shutdown, air
change and purge but had an “N” terminal for
occupancy. On W7213 and W7214 models N
terminal is either B or O terminal for use with
heat pumps.
There were three models:
• W7212A- Used with series 70 actuators
including DCA’s and Modutrol Motors
• W7213A - Used with heat pumps or
conventional rooftop units. B terminal
energized in heating and unenergized in
cooling
• W7214A - Used with heat pumps or
conventional rooftop units. O terminal
unenergized in heating and energized in
cooling.
All models could be panel mounted or directly
mounted to the M7215 motor.
Potentiometer and LED locations
(W7212 shown)
Power at the N terminal determines the
Occupied/Unoccupied setting:
For the W7212:
• 24 Vac (Occupied)
• No power (Unoccupied)
• N terminal powered – Space Occupied:
— If No Call for cooling or bad outdoor
enthalpy - dampers drive to minimum
position
— If Call for cooling - dampers open to sat-
isfy the mixed or discharge air sensor if
outdoor air is good enthalpy
• N terminal unpowered – Space Unoccupied:
— If No call for cooling - damper drives
closed if economizer is powered
— If Call for cooling - dampers open to sat-
isfy the mixed or discharge air sensor if
outdoor air is good enthalpy
DEMAND CONTROL
VENTILAION SETPOINT
ENTHALPY
CHANGEOVER SETPOINT
LED LIGHTS WHEN
DEMAND CONTROL
VENTILAION INPUT
IS ABOVE SETPOINT
EXHAUST
FAN SETPOINT
LED LIGHTS
WHEN EXHAUST
CONTACT IS MADE
MINIMUM DAMPER
POSITION SETTING
M20604
N1
P1
T1
N
2V
2V
2V
B
A
SR
SO
AQ
C
D
Free
Cool
10V
EXH
DCV
EXH
Set
10V
DCV
Max
10V
DCV
Set
Min
Pos
Open
P
T
AQ1
SO+
SR+
MAXIMUM DAMPER
DEMAND CONTROL
VENTILATION SETPOINT
LED LIGHTS WHEN
OUTDOOR AIR IS
SUITABLE FOR
FREE COOLING
ENTHALPY
SENSORS
CO
2
SENSOR
NIGHT
SET BACK
REMOTE
MINIMUM
POT INPUT
MIXED AIR
SENSOR
M23970A
N1
P1
T1
B
A
SR
SO
AQ
C
D
Free
Cool
EXH
IAQ
EXH
Set
IAQ
Max
IAQ
MIN
Min
Pos
Open
P
T
AQ1
SO+
SR+
N
EF1
5
2
24
VAC
COM
–
TR1
24
VAC
HOT
TR
4
EF
1
+
3

Honeywell Design and Application Specifications

General

Brand	Honeywell
Model	Design and Application
Category	Controller
Language	English