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T-359
7–20
7.15 DIGITAL UNLOADER VALVE
a. Removing the DUV:
1. Pump down the compressor (refer to
) and frontseat both suction and discharge valves. In
the event the DUV is stuck open and compressor cannot pump down, remove charge.
2. Turn unit power off and remove power from the unit.
3. Loosen bolt on top of the DUV and remove coil assembly.
NOTE
There is a loose steel spacer tube between the top of the valve and the 12 VDC coil that needs to be
reinstalled into the solenoid valve coil. When removing the coil, it may fall out when lifted from the
valve body. Take care that the spacer is not lost; the valve will not function correctly without it.
4. Remove clamps holding the DUV to the discharge line.
5. Loosen the nuts attaching the DUV to the top of the compressor.
6. VALVE REMOVAL: The preferred method of removing the solenoid valve is to cut the connection
between the brazed section and the valve, using a small tube cutter. Remove valve. (See
).
Alternately, use a wet rag to keep valve cool. Heat outlet connection to valve body and remove valve.
Figure 7.12 Digital Unloader Valve (DUV) Assembly
1. Sleeve
2. O-ring (hidden)
3. Screen Valve Strainer
4. Tube
5. Solenoid Valve Body
6. Hex Nut, 1/2 OD
- - - - -
7. Examine compressor and service valves. Ensure that the O-ring is not stuck in the gland of the valve.
8. Discard the O-ring on the O-ring face seal connection.
b. Installing the Valve:
1. Lubricate the gland shoulder area and O-ring with refrigerant oil.
2. Fit new valve in position and hand-tighten the O-ring nut.
3. Use a wet rag to keep valve cool while brazing. Braze DUV to service valve connection.
4. Reinstall and tighten the brackets that secure the valve body to the discharge line.
5. Torque O-ring face seal connections to 18 to 20 ft-lbs.
6. Install the coil onto the valve body and tighten the attachment bolt.
NOTE
Confirm that the small spacer tube is inserted into the coil prior to attaching it to the valve body. The
valve will not function correctly without it.
Summary of Contents for 69NT40-561-019
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