Stoelting O231, Руководство по обслуживанию

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EPR REPLACEMENT
To replace the EPR, perform the following procedures:
A. Apply a heat sink (wet cloth) to the EPR.
B. With an open port, braze the EPR into the system.
C. Remove the heat sink from the hot gas bypass.
D. Replace the filter drier. Refer to Section 5.8 for
details.
E. Evacuate and recharge system per instructions in
Section 5.2.
F. WATER VALVE (WATER COOLED MODELS ONLY)
The water valve monitors refrigerant pressure and opens on
an increase of pressure. The opening point pressure is the
refrigerant pressure required to lift the valve disc off the valve
seat. (Figure 5-10)
WATER VALVE ADJUSTMENT
A. Remove the lower front panel and side panel.
B. Connect a gauge to the compressor discharge
Schrader valve.
C. Connect the machine to the electrical supply, start
the refrigeration cycle, and read the pressure.
D. The proper gauge reading should be 235-245 psig.
The exit water temperature should be 95-107°F.
E. If the water temperature and high side pressure are
too low, the opening point pressure should be
increased to slow the water flow. Turn the
adjustment screw counterclockwise.
F. If the water temperature and high side pressure are
too high, the opening point pressure should be
decreased to increase the flow of water. Turn the
adjustment screw clockwise.
WATER VALVE REMOVAL
The water valve is connected to the refrigeration system by
capillary tube brazed to the discharge line.
A. Turn off and disconnect the water supply. Blow out
the water lines with compressed air or CO
2
.
B. Recover refrigerant charge per instructions in
Section 5.2.
C. Leave the suction and discharge ports open to
prevent pressure buildup during water valve removal.
D. Unsweat the capillary tube from the discharge line.
E. Remove the clamps from the water lines at the
valve.
F. Remove the two screws holding the water valve to
the frame and remove the valve.
WATER VALVE REPLACEMENT
To replace the water valve, perform the following proce-
dures:
A. Position the water valve and attach to the frame
using the two screws.
B. Install the water lines onto the valve with hose
clamps.
C. Leave the suction and discharge ports open to
prevent pressure buildup during water valve
installation.
D. Braze the capillary tube into the system.
E. Connect the water supply line and turn on the water
supply.
F. Check for leaks in the water lines. If there are no
leaks, turn off the water supply.
G. Replace the filter drier. Refer to Section 5.8 for
details.
H. Evacuate and recharge system per instructions in
Section 5.2.
I. Turn on the water and check for leaks in the water
lines with the refrigeration system running.
J. Adjust the valve as necessary.
5.7 SOLENOID
Solenoid valves are installed on the liquid lines of each
freezing cylinder evaporator. A solenoid valve has a mag-
netic coil that, when energized, lifts a plunger and allows
refrigerant to flow. The solenoids are activated by the
IntelliTec2 control.
Figure 5-10 Water Valve
Figure 5-11 Solenoid Valve