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8
2.7 Measuring Evaporator Temperature
There are a couple of ways to measure temperature of the evaporator plate:
1. Use a thermocouple to measure the temperature of the evaporator plate. The
thermocouple must be secured to the evaporator when taking the measurement.
2. If it has been determined that there is proper contact between the sensor and
evaporator plate, the sensor resistance value can be interpolated to be the approximate
evaporator temperature.
2.8 Re-charging
CAUTION
Re-charging of the unit should be done only after diagnosing and repairing the system. Be sure
to flush the system with dry nitrogen gas and evacuate to 50 microns before re-charging.
Vacuum Chart
Vacuum: Inches Hg.
Microns
28.94
25000
29.53
10000
29.832
4600
29.882
1000
29.901
500
29.915
150
29.917
100
29.919
50
THIS IS A CRITICALLY CHARGED APPLIANCE
Charging by a weight system is recommended.
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