Digital Loader Installation; Figure 7.18 Dlv Installation - Carrier 69NT40-561-399 Operation And Service Manual

7.20.2

Digital Loader Installation

1. Power unit off and lock/tag out to prevent inadvertent power up.
2. Remove 8 bolts from guard under control box and remove guard.
3. Remove the digital unloader valve coil (DUV) and place a magnet tool on the valve to open it. If a magnet is
not available perform the Jumper procedure:
a. Remove all 4 controller fuses (F1, F2, F3a, F3b).
b. Remove the wire from the KA6 connector on the front of the controller.
c. Disconnect the X1 wire from the 24VAC side of transformer (black wire) and locate it away for the transformer.
d. Jumper the black transformer wire to the KA6 wire removed from the connector.
e. Connect power to unit and turn circuit breaker on (DUV coil is now energized).
4. Connect a refrigerant recovery machine and recover refrigerant from the unit. (refer to the recovery
machines Operation and Service manual for proper procedures).
5. If jumper procedure was used for the recovery, turn the circuit breaker off and disconnect the power. Follow
the regional lock out tag out procedure for electrical.
6. Isolate valve by removing wire type wraps and conduit. Save any removed conduit for re-installation.
7. Remove top screw from the valve coil removing the coil and spacer. Ensure to retain the spacer as it is
required for proper operation of the valve. Position coil away from valve body.
8. Using a tubing cutter cut the DLV refrigerant line as marked in
9. Unbolt the valve from the mounting bracket and remove the valve assembly from the unit.
10.Clean pipework stubs on both unit and valve assembly in preparation for brazing.
11. Refit valve coil to the valve body ensuring the spacer ring is in place.
12.Slide new valve assembly into place, coupling the refrigerant lines.
13.Attach the solenoid coil to the mounting bracket of the new valve body and tighten.
14. Wet rag valve body and bracket mounting clamp. Failure to wet rag the body may result in the failure of the valve.
15.Using silver solder braze both bell connections.
16.Replace the filter drier.
17.With magnet still on the DUV stem, evacuate the compressor to 1000 Microns. If jumper procedure was
used in step 3, reconnect unit to power and turn on the circuit breaker to again power the DUV.
18.On completion of the vacuum, remove the magnet and reinstall the DUV coil. If a jumper was used, turn off
the circuit breaker and disconnect power. Remove jumper and reconnect the X1 wire to the black trans-
former wire. Reinstall and secure the KA6 wire to the KA plug at the controller.

Figure 7.18 DLV Installation

Step 9
DLV
Step 8
Step
8
Wet Rag All Areas
Prior to Brazing
7–25
Figure 7.18.
DUV
T-365