Section 8 - W6215, W7215 And W7460 Economizer Modules
73 Honeywell Economizers 63-8594-02
Minimum and Maximum Settings
This series of economizer modules includes
both minimum and maximum damper position
settings. Previous economizer controls are
equipped with only a minimum setting to
maintain a volume of outside air for ventilation.
The minimum setting on these modules is to
ventilate for the building components when
using DCV or to ventilate for cfm per person
for maximum occupancy when not using DCV.
The maximum setting is used to limit the
amount of outside air brought into the air
handler.
When using DCV, this is the sum of the
ventilation for the building components and
maximum human occupancy. See above
diagram for control of dampers using DCV and
minimum and maximum damper positions.
When DCV is not used this setting can be
used to limit the amount of outside air brought
into the system.
If the dampers are being modulated as the first
stage of cooling from the commercial
thermostat, the DCV maximum setting is not in
the circuit and the dampers can be opened
fully as needed. If the dampers are being
modulated from both the thermostat and the
DCV sensor, the dampers will be opened to
whichever is a higher signal. If the mixed air
temperature decreases below 40°F (4°C) the
signal from the DCV sensor is ignored and the
dampers are modulated toward closed to
prevent freezing of coils and other equipment
in the air handling unit.
Mininum
Position
Maximum
Position
Open
Free Cool
Closed
2V
6V
10V
4
T1
T
P1
Q1
AQ1
AQ
M23923A
Q
P
3
REMOTE MINIMUM
POSITION CONTROL
60
100
140
120
80
40
°F
60
100
140
120
80
40
°F
REMOTE MINIMUM
POSITION CONTROL
C7150 OR C7046
MIXED OR SUPPLY
AIR SENSOR
ppm
C7232 OR C7632
DCV CO
2
SENSOR
GND
AN1
DAMPER POSITION
CO2 LEVEL
100% OPEN
DCV MIN
POSITION
MIN POS
0% OPEN
450 PPM 800 PPM 2000 PPM
CO2 SENSOR ONLY
DCV ECONOMIZER FULL OCCUPANCY
DCV ECONOMIZER
NORMAL OPERATION WITHOUT DCV
CODE VENTILATION RATE
M23972A
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