Section 1 - Ventilation
17 Honeywell Economizers 63-8594-02
6. Use the mixed air temperature formula or the graph to determine the Demand Control
Ventilation maximum MAT:
7. Use the mixed air temperature formula or the graph to determine the minimum position MAT:
8. Close the outside air dampers. The
method used for this depends upon the
controller being used.
9. When using analog economizers, turn the
DCV maximum position control (pot) until
the measured mixed air temperature is
57.5°F (14.2°C). When using the JADE
TM
controller, go to the set point menu and
adjust the Vent max setting and the up
and down arrows on the keypad.
10. Mark this setting on the control as being
36% outdoor air.
11. Close the outside air dampers. On the
analog economizers, turn the minimum
position control (pot) until the measured
mixed air temp is 55.8 °F (13.2°C). When
using the JADE
TM
controller, go to the set
point menu and adjust the Vent min
setting using the up and down arrows on
the keypad.
12. Mark this setting on the control as being
30% outdoor air.
Return Air
Temperature
X
% of
Return
Air
+
Outside Air
Temperature
X
% of
Outside
Air
=
Temperature
of Mixed Air
73°F (23°C) X 64% + 30°F (-1°C) X 36% =
Temperature of
Mixed Air
46.7°F (8.2°C) + 10.8°F (-11.8°C) 57.5°F (14.2°C)
73°F (23°C) X 60% + 30°F (-1°C) X 30% =
Temperature of
Mixed Air
43.8°F (8.2°C) + 12°F (-11°C) 55.8°F (13.2°C)
M23918A
SUPPLY
AIR
SUPPLY OR
MIXED AIR
SENSOR
FAN
COILS
ADJUST THIS SETTING
UNTIL THE MIXED AIR
IS 62.5˚F (17 C)
COMMERCIAL
THERMOSTAT
S
+
OUTSIDE
AIR
30˚F (-1 C)
FILTERS
RETURN
AIR
73˚F (23 C)
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