Vollrath Stoelting E111I, Service Manual

Page: 36 / 61

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HIGH PRESSURE CUTOUT REMOVAL
A. Remove the front panel.
B. Recover refrigerant charge per instructions in
Section 5.2.
C. Leave the suction and discharge ports open to
prevent pressure buildup during removal.
D. Unsweat high pressure cutout from discharge line.
E. Disconnect the wires from high pressure cutout.
HIGH PRESSURE CUTOUT REPLACEMENT
A. With the suction and discharge ports open, braze
the high pressure cutout to the discharge line.
C. Replace the drier per the instructions in Section
5.9.
D. Braze the high pressure cutout to the discharge
line.
E. Evacuate the system per the instructions in Section
5.2.
F. Recharge the system per the instructions in Section
5.3.
G. Connect the wires to the high pressure cutout.
D. HOT GAS BYPASS
The hot gas bypass valve is installed in parallel to the
compressor and helps to regulate the compressor tempera-
ture (Refer to Figure 5-6). When the hopper evaporator is the
only part of the system requiring refrigerant, the bypass
valve will allow discharge gas to bypass into the suction line
to prevent liquid refrigerant from entering the compressor.
HOT GAS BYPASS ADJUSTMENT
NOTE
Before adjusting the hot gas bypass, check the EPR
valve and adjust if necessary.
A. Turn the Main Power OFF/ON switch to the OFF
position.
B. Connect a gauge to the Schrader valve on the
suction line next to the compressor.
C. Turn the Main Power OFF/ON switch to the ON
position.
D. After the hopper refrigeration starts, wait until the
gauge stops moving.
E. Unscrew the seal cap from the top of the valve.
F. Using a 5/16” Allen wrench, adjust the valve
counterclockwise to decrease pressure and
clockwise to increase pressure.
NOTE
Each 360° turn will change the pressure about 6 psig.
G. Adjust the hot gas bypass valve to 14 psig ±1.
H. Wait 2 minutes to ensure pressure remains stable.
I. Hand-tighten seal cap to valve.
HOT GAS BYPASS REMOVAL
A. Remove the side and rear panels.
B. Recover refrigerant charge per instructions in
Section 5.2.
C. Remove insulation around hot gas bypass and
tubing.
D. Leave the suction and discharge ports open to
prevent pressure buildup during hot gas bypass
removal.
E. Apply a heat sink (wet cloth) to the hot gas bypass.
F. Unsweat the hot gas bypass and remove.
HOT GAS BYPASS REPLACEMENT
To replace the hot gas bypass, perform the following
procedures:
A. Apply a heat sink (wet cloth) to the hot gas bypass.
B. With an open port, braze the hot gas bypass into
the system using appropriate brazing material.
Figure 5-6 Hot Gas Bypass
WARNING
Hazardous voltage
The Main Freezer Power switch must be placed in
the OFF position when disassembling for servic-
ing. The machine must be disconnected from elec-
trical supply before removing any access panel. Fail-
ure to disconnect power before servicing could re-
sult in death or serious injury.