
Refrigeration Service Operations
153
7. Continue to turn the piston and piston nut onto
the stepper motor until they are tight. Torque
the piston nut and stepper motor to 37 ft-lb (50
N•m).
Installation of Complete ETV Assembly
1. Clean the tubes for soldering.
2. Place the new complete ETV assembly (and
any tubes that were removed) in the same
position from which the old one was removed.
The new ETV could interfere with other
components if it is not placed in the same
position as the old one. The ETV assembly
must be installed as shown below relative to
the direction of refrigerant flow from the
evaporator to the heat exchanger.
NOTE: Do not disassemble the new ETV to
solder it in place.
3. Use a heat sink or wrap the valve body with a
wet rag to prevent damage and solder the
tubing connections with 95-5 soft solder.
4. Connect the ETV harness to the main wire
harness at the four-pin connector.
5. Pressurize the low side and test for leaks.
6. If no leaks are found, evacuate the low side.
7. Install the components that were removed to
access the ETV.
8. Open the refrigeration valves and place the
unit in operation.
Hot Gas Bypass Valve
Removal
1. Recover the refrigerant charge.
2. Disconnect the wires and remove the coil for
the valve.
3. Unsolder the refrigeration lines.
4. Remove the mounting bolts and remove the
valve.
Installation
1. Clean the tubes for soldering.
2. Remove the coil from the valve.
3. Place the valve in the unit and install the
mounting bolts. The arrow on the valve
indicates the direction of flow through the
valve. Make sure that the arrow points in the
proper direction.
4. Solder the inlet and outlet connections. After
the valve cools, install the coil.
5. Pressurize the refrigeration system and test for
leaks.
6. If no leaks are found, evacuate the system.
7. Recharge the unit with proper refrigerant and
check the compressor oil.
Compressor Oil Filter
This unit is equipped with a compressor oil filter.
The compressor oil filter should be changed when
the drier is replaced.
The outlet fitting is larger than the inlet fitting, so
the compressor oil filter cannot be put on
backwards. There are two fittings on the inlet end
of the compressor oil filter. The inlet fitting
contains a check valve that prevents reverse flow
through the compressor oil filter. The capped
fitting is called the oil pressure access port and is
used to check the compressor oil pressure (see
“Checking Compressor Oil Pressure”).
1.
Use Heat Sink
2.
Direction of Refrigerant Flow
Figure 240: Installing Complete ETV Assembly
1
2