MICROSENTRY™ REFRIGERATION MONITOR
3.4 Evaporator
The evaporator uses evaporating refrigerant to remove heat from the inside of the unit ultimately making the inte-
rior cold. The shape and size of the evaporator may vary among the models covered by this service manual but the
fundamentals are the same (see Figures 3.9, and 3.10). The 3SWCE and 3SBARE use a vertical right angle evapo-
rator plate. The 61WCM and 6BARM use a U-shaped plate.
It is normal for the evaporator to frost up during its run cycle. This frost will dissipate once the unit reaches its “cut
out” temperature and the compressor and fan stop. This condensate water will flow to the rear of the machine in a
condensate pan where it will be evaporated from compressor and fan heat. It is very important that the evaporator
frosts in a uniform pattern across the plate (see Section 2.6, Evaporator Frost Pattern). A partial frost pattern can
lead to excessive run times and cooling issues.
Figure 3.10:
U-shaped evaporator plate used in the 61WCM and
6BARM
Typical low charge or system leak on this evaporator
style will have a frost pattern that is only on the left
hand side of the plate, not full across the plate.
Figure 3.9:
Vertical right angle evaporator plate used in the
30WCM & 3BARM
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