Menu Item Description
12 RTHC-SVD01B-EN
2-8. Liquid Level Control
On RTHC units the EXV controls off of the liquid level sensor in the
evaporator rather than the discharge superheat. The liquid level sen-
sor is required to provide input necessary for the control of the EXV. As
the liquid level in the evaporator exceeds the optimum level the EXV
will begin to close. As the liquid level value drops the EXV will begin to
open.
The liquid level sensor (see Figure 2-3) only has a readable range from
+1.0 to -1.0 therefore, it is mounted at different elevations on the vari-
ous evaporators to give an optimum level read out on the UCP2 of 0.0
inches on all evaporator sizes.
Figure 2-2 Diagram of EXV Steps
100% open
2% open
0% open
70% open
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