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Asset Protection and IAQ Solutions
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HI-E DRY 100
Installation, Operation and Maintenance Instructions
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5.8 Humidity Control
The humidity control is an adjustable switch that closes when the relative humidity of the air in which it is
located rises to the dial set point. It opens when the RH drops 4 to 6% below the set point.
5.9 Defrost Thermostat & Timer
The defrost thermostat is attached to the refrigerant suction tube between the accumulator and compressor.
If the low side refrigerant temperature drops due to excessive frost formation on the evaporator coil, the
thermostat opens. The compressor is then cycled off and on by the defrost timer. The blower will continue to
run, causing air to flow through the evaporator coil and melt the ice when the compressor is off. When the
air temperature and/or humidity increase, the evaporator temperature will rise and the thermostat will close
to end the defrost cycle.
5.10 Condensate Pump
Condensate is automatically pumped when the water level in the pump’s reservoir rises to close the float
switch.
If the pump is unable to empty its reservoir due to a pump failure or blocked condensate hose, a pump safety
float switch is triggered before the reservoir overflows. The switch turns off the compressor via its relay.
To replace the condensate pump:
1. Unplug the unit & remove the front cover.
2. Disconnect the 2 hoses from the pump.
3. Cut the pump lead wires near the old pump.
4. Remove the 2 nuts from the unit side that hold the pump to the side.
5. Attach the new pump with 2 nuts.
6. Connect the new pump wiring.
7. Connect the hoses to the new pump. Carefully route the hoses so they do not contact the copper
refrigerant lines or the compressor shell.
