Section 7 - W6210 And W7210 Economizer Modules
65 Honeywell Economizers 63-8594-02
W6210 and W7210 Components
The W7210 logic modules had the identical
functions as the W7459 modules with the
addition of a 2-10 Vdc output for use with
M7215 foot-mounted actuators or DCA’s and
Modutrol Motors with 2-10 Vdc control. The
mixed air control circuit was in the logic
module and no longer in the actuator. The
actuator could also be powered with the same
24 Vac power as the logic modules provided
the internal grounding of the actuator was
compatible. Note some of the non-Honeywell
actuators were not compatible with the
M7210.
High Limit Function
There were high limit versions of these
economizer logic modules, W7210D. When in
the differential enthalpy mode and both the
return and outside air enthalpy were above a
preset level, the outside air dampers were
returned to minimum position and the
mechanical cooling was energized. The curve
for this limit function is illustrated on the
psychrometric chart as the line to the right of
the A curve. Refer to high limit section of this
guide for more information.
Wiring Connections
There are many possible wiring diagrams and
combinations of controllers and actuators that
can be used with the logic modules. Once you
understand the input and output of the
modules, you can usually determine how a
system should be wired.
NOTE: Many user systems are wired to
bypass operations and to “trick” the
module into operating in a mode that it
was not designed to do, these are the
applications which may confuse you.
When is doubt, call the unit supplier or
refer to the product instructions for
wiring diagrams.
2-10V
OUT
24 VAC
HOT
24 VAC
COM
1
TR
COM1
+
+
B
AD
C
TR
HOT
24 VAC
SO
SR
5
2
4
T1
P1
T
P
MINIMUM
POSITION
OPEN
FREE
COOLING
W7210 A 1001
SINGLE ENTHALPY
SETPOINT
MINIMUM DAMPER POSITION
SETPOINT
FREE COOLING MODE LIGHT
M23897A
+
–
24 VAC POWER TERMINALS
OUTSIDE AIR ENTALPY SENSOR
ACTUATOR
POWER SUPPLY
TERMINALS
ACTUATOR
TERMINALS
RETURN AIR ENTHALPY SENSOR
COOLING SWITCHING
CONTROLLED FROM
COOLING STAT
3
REMOTE MINIMUM
POSITION POTENTIOMETER
MIXED AIR SENSOR
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