Liebert DS Reassembly-Downflow Units, Reconnecting Piping, Charging and Replacing Panels

Disassembling the Liebert DS for Transport

6.3Reassembly—Downflow Units

1.Replace the top section.

Make sure to clear the Schrader valves on the coil header.

2.Reconnect the filter and electric box assembly to the blower and coil assembly using thread- cutting bolts.

Torque the bolts to 225 in-lb. (25Nm)

3.Reattach the evaporator top cover plate; there are eight screws on each side.

4.Reattach the filter support plate to the filter and electric box assembly; there is one screw on each side.

5.Reattach the tags to the Schrader fittings on top of the coil headers.

6.Replace the compressor section.

Insert all compressor thread-cutting bolts before tightening any of the bolts.

7.Reinstall the pull bar to support the accent panel.

8.Reattach the low-voltage plugs in the compressor section.

9.Reconnect the wiring for the compressor, fan motor, reheat, humidifier, condensate pump, smoke detector and air sail switch.

10.Reattach the sensing tube to the top of the smoke detector.

11.On GLYCOOL and dual-cool units, reattach the plug connection at the actuator and reroute the sensor wire back through the electric box and onto the control board.

6.3.1Reconnecting Piping, Charging and Replacing Panels

1.Piping must be reassembled in accordance with local codes.

2.Move insulation and plastic bushings away from the brazing area.

3.Wrap piping with wet cloths. Use copper fittings where required.

4.Refer to 8.0 - Piping for piping guidelines and to the ASHRAE Refrigeration Handbook for general, good-practice refrigeration piping.

5.Open the service valves on the compressor.

6.Reinsert the plastic bushings.

7.Charge the Liebert DS with refrigerant; see the unit’s nameplate for the proper charge.

8.Reinstall the galvanized panels on the left side of the coil.

9.Replace the filters.

10.Replace the panels.

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