Honeywell Design and Application Technical Reference Manual page 104

Section 10 - W7340 and W7345 Economizer Module
will drive to the minimum position ventilating
for building contaminants and the building
occupants.
The W7340C does not have a separate
potentiometer to select the new DCV minimum
damper position. The following procedure
allows the installer to set the new DCV
minimum position.
DCV Minimum and Minimum
Position Damper Set Up
Set up instructions for W7340C DCV damper
positions:
1. Remove RAT sensor from RAT terminals.
2. Connect CO sensor to DCV terminals.
2
3. Apply power to economizer logic module.
4. Wait 10 to 15 seconds for the CO
to initialize. Short RAT terminals.
5. Remove CO sensor from DCV terminals.
2
6. DCV LED will blink 2 times. If LED does
not blink, cut power to economizer logic
and repeat steps 1-5.
7. Set DCV minimum position using MIN
POS/DCV MIN potentiometer.
8. Remove RAT short.
9. DCV minimum position is saved to
memory and DCV LED blinks 5 times.
10. Turn off power to economizer logic
module.
11. Connect RAT sensor.
12. Turn power on to economizer logic
module.
13. Set minimum position using MIN POS/
DCV MIN
63-8594-02 Honeywell Economizers
IMPORTANT
Steps 3-8 must be completed within 3
minutes after power up otherwise the
configuration process will be termi-
nated, no changes will be saved and
you will need to repeat steps 1-13.
DAMPER POSITION
100% OPEN
DCV MIN
POSITION
MIN POS
0% OPEN
sensor
2
W7340 Demand Control Ventilation
Unlike the W7215 and W7212, which have
minimum position for the Building
contaminants and DCV maximum for the total
ventilation required by design, the W7340C
has different labels for the same functions.
DCV minimum is the same as the W7212
minimum position and the minimum position
for W7340C is the DCV maximum on the
W7212.
It is VERY IMPORTANT to know the difference
between the various suppliers equipment as
what they are referring to in their control
language. If the W7340 or W7345 unit is not
black in color then the economizer controller is
not made by Honeywell and the operation of
the unit may not follow the description in this
manual. Contact the OEM of the equipment for
operation.
98
CODE VENTILATION RATE
450 PPM 800 PPM
CO2 LEVEL
NORMAL OPERATION WITHOUT DCV
CO2 SENSOR ONLY
DCV ECONOMIZER FULL OCCUPANCY
DCV ECONOMIZER
2000 PPM
M23972A