Specifications

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.

Page 44