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TEMPERATURE DIFFERENTIAL TESTING
The purpose of this test is to evaluate whether or not your cooling unit is operating correctly by
measuring the temperatures of both the inside of the cellar and the exhaust side of the unit in
the adjoining room. The majority of problems found with cooling units result from inadequate
ventilation on the exhaust (back) side of the unit; therefore, taking these measurements is
critical in ensuring the optimal performance of the product while minimizing costs of operation.
The WhisperKOOL unit is designed to maintain relative humidity between 50-70%, which is
accomplished by cooling the cellar slowly. You should anticipate an approximate 10 - 15 degree
temperature differential between the inlet air temperature and the outlet air temperature on the
evaporator (front) side of the unit.
When testing the air temperature, please hold the thermometer in the appropriate location for
a full minute before recording temperatures so that the thermometer has stabilized.
Do not use
PDT Probe! *
Please refer to the images at the end of the document as a guide to where to measure the
temperature of the inlet/outlet air:
*Note: to check air temperature, use a digital thermostat which can be purchased at any
hardware store under kitchen supplies.
First Temperature Test:
1. Stabilize the unit by turning it on and letting it run for five minutes before
performing the first temperature test.
2. Measure temperature of the inlet air going into the cooling unit on the evaporator
(front) side.
3. Measure temperature of the outlet air discharging out of the cooling unit on the
evaporator (front) side by holding the thermometer at the outer edge of the circular fan.
4. Record information and calculate temperature differential in table below for the
evaporator (front) side section under the first test.
5. On the back side of the unit, measure temperature of the inlet air going into the cooling
unit on the condenser (back) side.
6. On the back side of the unit, measure temperature of the outlet air discharging out of
the cooling unit on the condenser (back) side by holding the thermometer at the outer
edge of the circular fan.
7. Record information and calculate temperature differential in table below for the
condenser/back side section under the first test.
Second Temperature Test:
8. After the unit has run for 8 hours, perform the second temperature test.
9. Record information and calculate temperature differential in table below for the
condenser/back side section under the second test.