Minimum And Maximum Settings - Honeywell Design and Application Technical Reference Manual

Mininum
3 4
Position
T T1
Open
P1
P
Free Cool
Maximum
Position
Q
Q1
Closed
6V
AQ
AQ1
2V 10V
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.

Minimum and Maximum Settings

C7150 OR C7046
MIXED OR SUPPLY
AIR SENSOR
10 0
80 REMOTE MINIMUM
12 0
60
POSITION CONTROL
40
14 0
°F
10 0
80 REMOTE MINIMUM
12 0
60
40 POSITION CONTROL
14 0
°F
AN1
C7232 OR C7632
DCV CO SENSOR
GND
2
ppm
M23923A
Section 8 - W6215, W7215 And W7460 Economizer Modules
DAMPER POSITION
100% OPEN
CODE VENTILATION RATE
DCV MIN
POSITION
MIN POS
0% OPEN
450 PPM
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.
73
800 PPM 2000 PPM
CO2 LEVEL
NORMAL OPERATION WITHOUT DCV
CO2 SENSOR ONLY
DCV ECONOMIZER FULL OCCUPANCY
DCV ECONOMIZER
Honeywell Economizers 63-8594-02
M23972A