Thermo King T-1000R, Maintenance Manual

Page: 228 / 282

Refrigeration Maintenance 10-44
Installation
A heat sink must be used on the in-line check valve when it is being soldered in place to prevent damage to the neoprene seal.
1. Clean the tubes for soldering.
2. Place the check valve in position. The arrow on the valve body indicates the direction of refrigerant flow through the valve.
3. Place a heat sink on the check valve.
4. Solder the inlet and outlet connections.
5. Pressurize the refrigeration system and test for leaks.
6. If no leaks are found, replace the liquid line drier then evacuate the system.
7. Recharge the unit with proper refrigerant and check the compressor oil.
LIQUID INJECTION SOLENOID (LIS) TEST
1. Attach a gauge manifold to the suction service valve and the discharge service port. A low loss fitting must be used on the
hose connected to the discharge service port.
2. Run the unit with all zones in low speed cool until the system pressures stabilize.
3. Front seat the suction service valve and allow the compressor to pump down to 0 to 5 in. Hg vacuum (0 to -17 kPa).
4. Turn the unit Off.
5. Monitor the suction pressure. It will rise very slowly as the discharge pressure leaks back through the discharge device into
the compressor. If the suction pressure is rising steadily, the LIS might be leaking.
6. Check the temperatures of the refrigeration lines on each side of the LIS by hand. A temperature difference between the two
sides of the LIS indicates it is leaking.
7. Use the Mechanics/Premium HMI Control Panel to enter the Interface Board Test Mode. Refer to the appropriate
Microprocessor Diagnostic Manual for specific information about the Interface Board Test Mode.
8. From the Interface Board Test Mode select Liquid Injection Valve.
9. Momentarily energize the LIS with the Interface Board Test Mode by pressing the TEMP ON key. The suction pressure
should rise slightly. If the suction pressure does not rise, the LIS is not opening. Check the continuity of the wiring and the
solenoid coil before assuming the solenoid is faulty.
10. Back seat the suction service valve and perform a “Refrigerant Gauge Removal” procedure.
LIQUID INJECTION SOLENOID (LIS) REPLACEMENT
Removal
1. Recover the refrigerant charge.
2. Unsolder the inlet/outlet lines from the liquid injection solenoid.
3. Remove liquid injection solenoid mounting bolts and remove the liquid injection solenoid from the unit.
Installation
1. Install and bolt the liquid injection solenoid assembly in the unit.
2. Solder (95-5 Solder) the inlet liquid line and the outlet line to the injection solenoid.
3. Pressurize the system and test for leaks.
4. If no leaks are found, replace the liquid line drier then evacuate the
system.
5. Recharge the unit with refrigerant and check the compressor oil.
6. Test the unit to see that the valve is properly installed.
CAUTION: Do not run scroll compressor in a vacuum for more than 1 minute.