Liebert DS user manual Disassembly-Upflow Units

Disassembling the Liebert DS for Transport

6.5Disassembly—Upflow Units

For detailed views of upflow units, see Figures 46 through 54.

1.Remove the unit from its skid.

2.Remove all panels except top front accent.

3.Remove all filters on front return units. This allows easier access to items located in the filter and coil assembly.

4.All wires are hot stamped and all circuit board connectors are lettered for easy replacement. Cable ties will need to be cut and replaced as necessary. Reference unit wiring schematic on deadfront panel for details.

5.Label the (3) quick connect plugs from the compressor compartment, and disconnect them.

6.Disconnect compressor wire harness, including crankcase heater wires, if applicable, from contactor in electric box. Pull conduit and wires into compressor compartment.

7.Reheat (optional component): Disconnect reheat wire harness from bottom of contactor in electric box. Unplug low-voltage quick connect for reheat safety wires. Pull conduit and wires into filter and coil assembly section of unit.

8.Humidifier (optional component): Disconnect humidifier wire harness from bottom of contactor in electric box. Remove humidifier low-voltage connections 35-5 and 35-6 by disconnecting quick connect plug, disconnect 35-3 and 35-4 from control board. Pull conduit and wires into filter and coil assembly section of unit.

9.Condensate pump (optional component): Disconnect condensate pump high-voltage wire harness. Remove low volt wires from terminal strip #24 and #55. Pull conduit and wires into filter and coil assembly section of unit.

10.Glycool/Dual-Cool (optional component): On units with actuator, unplug valve actuator harness at actuator and pull wire harness into electric box. Disconnect glycol sensor from control board and pull into filter and coil assembly section of unit.

11.Smoke detector (optional component): For units with smoke detector, remove cover on smoke detector. Remove plug connector from smoke detector and pull into electric box. Remove wires from terminal strip #91, 92, 93 and route the wires to the smoke detector box. Remove the sensing tube from the bottom of the plastic elbow.

12.Filter Clog Switch: Disconnect both tubes from the filter clog switch. Pull both of the tubes into the electric box.

13.Close the electric box cover and the accent panel.

14.Remove the pull bar that supports the accent panel from left end of unit, otherwise it will fall out when the compressor section is removed.

15.Evacuate and recover all refrigerant from the unit.

Air-cooled units contain a nitrogen holding charge. Water, glycol and GLYCOOL units are factory charged with refrigerant. Refer to 8.0 - Piping for piping guidelines and to the ASHRAE Refrig- eration Handbook for general, good-practice refrigeration piping.

NOTICE

Risk of compressor oil contamination with moisture.

Emerson recommends front-seating the compressor service valves. Front-seating the valves keeps the nitrogen or refrigerant charge in the compressor and prevents moisture from contaminating the compressor oil. This is particularly important with units using R-407C refrigerant.

16.Cut and pull back insulation from piping.

17.Cut the refrigerant piping with a tubing cutter; if there is no Schrader fitting, let the nitrogen bleed out before cutting all the way through the pipe.

NOTE

Emerson does not recommend unsweating refrigerant connections.

18. Unsweat or cut all copper water pipes that interconnect unit sections.

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