Specifications

14
Use the following graph and the multimeter to
verify proper operation of the mixed air / discharge
air temperature sensor.
Measure the resistance (ohms) of the mixed air /
discharge air temperature sensor with the
multimeter. Look up the equivalent temperature
on the graph. This should be the same as
temperature the mixed air / discharge air sensor is
detecting. If it is not, replace the mixed air
/discharge air sensor.
NOTES
1. 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.
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).
4. This economizer requires a two-stage thermostat.
5. Upon loss of power to the unit or economizer, the outside air damper will spring close shut in about 5 seconds.
6. Compressor Time Delays, Compressor Interstage Delays, Compressor Low Ambient Lockouts, etc. are not provided
by the economizer controller.
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