Thermo King 098916, Руководство по обслуживанию

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Electrical Maintenance
122
Low Pressure Cutout Switch
Installation
Install the low pressure cutout switch by
performing the following steps:
On units built before December 2003:
1. Install low pressure cutout switch in the
suction line.
2. Route wires into the control box and connect
to proper terminals.
3. Pressurize the low side with refrigerant and
check for leaks. If no leaks are found, recover
the leak test gas (see “Recovering Refrigerant
from the System).
4. Evacuate the system (see “Evacuation and
Cleanup of the Refrigeration System”).
5. Recharge the unit with R-404A (see
“Refrigerant Charge”).
6. Perform a controller pretrip test to verify
system operation.
On units built after December 2003:
1. Install low pressure cutout switch in the
suction line.
2. Route wires into the control box and connect
to proper terminals.
3. Perform a controller pretrip test to verify
system operation.
Discharge and Low Pressure
Sensors (Optional)
The unit can be configured discharge only, suction
only, or discharge and suction. The sensors are
located on the discharge or suction tubes near the
compressor. The controller will display the actual
discharge or suction system pressure. The display
will show a reading and a bar graph. If the unit is
configured with a suction sensor, the LPCO will
be eliminated.
To configure a sensor in the unit (see
“Configuration Menu” in the Operating
Instruction chapter in this manual).
Discharge and Low Pressure
Sensors Removal
Remove the discharge or suction sensor by
performing the following steps:
1. Disconnect the sensor from the control box.
2. Remove the sensor from the discharge or
suction tube. The fitting on the line has a
Schrader valve which will prevent refrigerant
leakage.
Discharge and Low Pressure
Sensor Installation
Install the discharge and low pressure sensor by
performing the following steps:
1. Apply Locktite to fitting threads (Red 277).
2. Install sensor on fitting.
3. Route wire harness to control box and connect
per wiring diagram.
1. Suction Pressure Sensor
2. Discharge Pressure Sensor
3. Suction Service Valve
4. Discharge Service Valve
Figure 68: Pressure Sensor Location