Stoelting O231, Руководство по обслуживанию

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33
ACTIVATING A SOLENOID
To activate a solenoid, follow these steps:
A. Turn the machine on by pressing the Main Power
Off/On button.
B. Press the right arrow, SET, then the SEL button to
access the technician level on the control.
C. Navigate to the Left Output Control or Right Output
Control menu which is located under Utilities in the
Testing and Manual Operation screen. Refer to
Section 4 for details.
D. Activate the solenoid by moving the cursor to the
Liquid Solenoid option and pressing the SET
button.
NOTE
Any energized component will deenergize after leav-
ing the Testing and Manual Operations menu.
SOLENOID TESTING
The following test will check if a liquid line solenoid has a
leaking valve seat. The power to the solenoid is discon-
nected and refrigerant flow is monitored through the sys-
tem. If the valve seat does not leak, the suction pressure
during the test will be low.
A. Attach a gauge to the Schrader valve on the suction
line.
B. Turn the machine on by pressing the Main Power
Off/On button.
C. Press the right arrow, SET, then the SEL button to
access the technician level on the control.
D. Navigate to the Left Output Control or Right Output
Control menu which is located under Utilities in the
Testing and Manual Operation screen. Refer to
Section 4 for details.
E. Activate the compressor by moving the cursor to
the compressor option and pressing the SET
button.
F. The gauge should read well below 21 psig after 1
minute.
G. A leaking valve seat may also show frost on the
liquid line tubing just past the solenoid and before
the evaporator.
SOLENOID MAGNETIC COIL REMOVAL
A. Remove the side panel.
B. Disconnect the electrical wires.
C. Remove the retainer screw from the top of the
solenoid and pull the magnetic coil off.
SOLENOID MAGNETIC COIL INSTALLATION
To replace the magnetic coil, perform the following proce-
dures:
A. Push the coil on to the solenoid valve stem.
B. Connect the two electrical wires to the magnetic
coil.
C. Make sure there isn’t any foam insulation between
the valve coil and valve body. Trim any excess
insulation.
D. Install retainer screw onto top of coil.
SOLENOID VALVE REMOVAL
A. Identify and disconnect the two wires from the
solenoid coil.
B. Remove the retainer holding the coil to the solenoid
body and remove the coil.
C. Recover refrigerant charge per instructions in
Section 5.2.
D. Remove insulation around valve and attached
refrigeration lines.
E. Apply heat sinks (wet cloth) to the insulated
refrigerant lines near the valve.
F. Leave a port open to prevent pressure buildup
during solenoid removal
G. Unsweat the solenoid and remove.
SOLENOID VALVE REPLACEMENT
To replace the solenoid, perform the following procedures:
A. Position the new solenoid with the arrow pointing
toward the direction of refrigerant flow.
B. Apply a heat sink (wet cloth) to the solenoid valve.
C. With the suction and discharge ports open, braze
the solenoid into the system.
D. Remove the heat sink from the valve.
E. Replace insulation around valve.
F. Replace the filter drier. Refer to Section 5.8 for
details.
G. Evacuate and recharge system per instructions in
Section 5.2.