W7212, W7213, And W7214 Components - Honeywell Design and Application Technical Reference Manual

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.
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
NIGHT
SET BACK
EXH
N1 N
REMOTE
EXH
MINIMUM
P1 P
POT INPUT
Min
Pos
MIXED AIR
T
T1
Open
SENSOR
IAQ
Max
CO
IAQ
2
AQ
AQ1
SENSOR
IAQ
SO+ MIN
SO
ENTHALPY
Free
SENSORS SR
Cool
SR+
B C
A D
83
Section 9 - W7212, W7213 and W7214 Economizer Modules
All models could be panel mounted or directly
mounted to the M7215 motor.
EXHAUST
FAN SETPOINT
LED LIGHTS
WHEN EXHAUST
CONTACT IS MADE
MINIMUM DAMPER
POSITION SETTING
MAXIMUM DAMPER
DEMAND CONTROL
VENTILATION SETPOINT
LED LIGHTS WHEN
DEMAND CONTROL
VENTILAION INPUT
IS ABOVE SETPOINT
DEMAND CONTROL
VENTILAION SETPOINT
LED LIGHTS WHEN
OUTDOOR AIR IS
SUITABLE FOR
FREE COOLING
CHANGEOVER SETPOINT
Potentiometer and LED locations
(W7212 shown)
TR TR1
Set
24
24
VAC
VAC
COM
HOT
+ –
1 2
5
3 4
EF
EF1
M23970A
— 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
EXH
N1
Set
N
2V 10V
EXH
P1
P
Min
Pos
T1
Open
T
DCV
Max
2V 10V
AQ1
DCV
AQ
DCV
Set
SO+
2V 10V
SO
Free
SR+
Cool
B C
SR
A D
ENTHALPY
M20604
Honeywell Economizers 63-8594-02