16
NOTES
1.
This economizer requires a two-stage thermostat.
2.
When diagnosing the system, the best results are
obtained by first putting the fan setting on the
Thermostat to the “Continuous Fan” mode.
3.
Operation of the optional power exhaust only depends
upon the supply fan running and the damper position
(it is possible to set the minimum position high enough
to engage the power exhaust in the heating mode).
Table of Inputs and Output Response with and without a CO
2
Sensor (DCV)
Inputs to Controller
Outputs from Controller
DCV
Free Cooling
Available?
Y1-I
Y2-I
AUX2-I
FAN
Y1-O
Y2-O
OA Damper position
None
NO
OFF
OFF
OFF
OFF
OFF
OFF
CLOSED
OFF
OFF
OFF
ON
OFF
OFF
MIN POS
ON
OFF
OFF
ON
ON
OFF
MIN POS
ON
ON
OFF
ON
ON
ON
MIN POS
ON
OFF
ON
d
ON
ON
OFF
MIN POS
ON
ON
ON
d
ON
ON
ON
MIN POS
YES
OFF
OFF
OFF
ON
OFF
OFF
MIN POS
ON
OFF
OFF
ON
OFF
OFF
MIN POS to 100%
ON
ON
OFF
ON
ON
OFF
b
MIN POS to 100%
ON
OFF
ON
d
ON
ON
OFF
MIN POS
ON
ON
ON
d
ON
ON
ON
MIN POS
Below
Setpoint
NO
OFF
OFF
OFF
ON
OFF
OFF
VENTMIN
ON
OFF
OFF
ON
ON
OFF
VENTMIN
ON
ON
OFF
ON
ON
ON
VENTMIN
ON
OFF
ON
d
ON
ON
OFF
VENTMIN
ON
ON
ON
d
ON
ON
ON
VENTMIN
YES
OFF
OFF
OFF
ON
OFF
OFF
VENTMIN
ON
OFF
OFF
ON
OFF
OFF
VENTMIN to 100%
ON
ON
OFF
ON
ON
OFF
b
VENTMIN to 100%
ON
OFF
ON
d
ON
ON
OFF
VENTMIN
ON
ON
ON
d
ON
ON
ON
VENTMIN
Above
Setpoint
NO
OFF
OFF
OFF
ON
c
OFF
OFF
VENTMIN to VENTMAX
ON
OFF
OFF
ON
ON
OFF
VENTMIN to VENTMAX
ON
ON
OFF
ON
ON
ON
VENTMIN to VENTMAX
ON
OFF
ON
d
ON
ON
OFF
VENTMIN to VENTMAX
ON
ON
ON
d
ON
ON
ON
VENTMIN to VENTMAX
YES
OFF
OFF
OFF
ON
c
OFF
OFF
VENTMIN to VENTMAX
ON
OFF
OFF
ON
OFF
OFF
VENTMIN to 100%
ON
ON
OFF
ON
ON
OFF
b
VENTMIN to 100%
ON
OFF
ON
d
ON
ON
OFF
VENTMIN TO VENTMAX
ON
ON
ON
d
ON
ON
ON
VENTMIN TO VENTMAX
b
With STG3 DLY in ADVANCED SETUP MENU at 2.0 hours, the 2
nd
stage of mechanical cooling Y2-O can be energized after a 2 hour delay if the call
for Y1-I and Y2-I have not been satisfied.
c
The CO
2
sensor has a relay output that is active when the CO
2
level is above 1200ppm that can be used to energize the indoor fan through the “G”
thermostat input of the unit even if there is not a call for fan, cooling or heating by the room thermostat. Additional field wiring is required to enable this
option.
d
AUX2-I is used only on heat pump models to indicate unit is in heat pump (heating) mode.
4.
Upon loss of power to the unit or economizer, the
outside air damper will spring close shut in about 5
seconds.
5.
The mist eliminator (Permanent Outdoor Air Filter) is of
aluminum mesh construction and should be cleaned
by flushing regularly with warm soapy water. The
replacement mist eliminator size is listed on the first
page of these instructions.
6.
Compressor Time Delays, Compressor Interstage
Delays are not provided by the economizer controller.
