8-8 Vogt
®
VT Service Manual
Service Operations
Adjusting TXV:
Ice should start forming on the evaporator tubes approximately two inches from the top
flange. Freezing too high on the evaporator may cause ice to hang up on tubes and not release properly.
To lower ice level, the TXV can be closed by running the stem in. Do this by turning the TXV stem clockwise
as shown below. (looking up at the valve stem)
Note: Close TXV ¼ turn at a time. Observe several cycles before making further changes.
If ice is not freezing high enough on the evaporator tubes, the TXV can be opened by backing the stem out.
Do this by turning the TXV stem counter-clockwise. (looking up at the valve stem)
Note: Check expansion valve inlet strainer before opening valve. Clean strainer if necessary.
Open TXV ¼ turn at a time. Observe several cycles before making further changes.
FIGURE 8-7
Adjusting TXV
Inlet Pressure Regulator:
This regulator valve is used on the split VT40, split VT60, VT80 and VT100.
The purpose of this valve is to maintain head pressure during the harvest cycle. (Set point = 160-170 psig)
FIGURE 8-8
Inlet Pressure Regulator
Remove TXV cap
Close TXV – clockwise (freeze lower on tubes)
Expansion Valve
Inlet Strainer
Nut
Adjustment Screw
Clockwise – raise pressure set point
Counterclockwise – lower pressure set
point
Expansion Valve inlet screen/strainer
can be accessed by removing nut
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