Liebert Precision Cooling System DS - Manual (Page 53)

Disassembling the Liebert DS for Transport
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NOTICE
Do not lay the compressor section on its side. It must remain upright. The coil section also
must remain upright.
5. Label the three quick-connect plugs from the compressor compartment and disconnect them.
6. Disconnect the compressor wire harness, including the crankcase heater wires, if present, from
the contactor in the electric box.
7. Pull the conduit and wires into the compressor compartment.
8. Disconnect the fan motor wire harness from the bottom of the contactor in the electric box.
9. Pull the conduit and wires into the bottom section of the Liebert DS.
10. Reheat—Optional Component
a. Disconnect the reheat wire harness from the bottom of the contactor in the electric box.
b. Unplug the low-voltage quick connect for the reheat safety wires.
c. Pull the conduit and wires into the unit’s blower and coil assembly section.
11. Humidifier—Optional Component
a. Disconnect the humidifier wire harness from the bottom of the contactor in the electric box.
b. Remove the humidifier low-voltage connections 35-5 and 35-6 by disconnecting the
quick-connect plug.
c. Disconnect 35-3 and 35-4 from the control board.
d. Pull the conduit and wires into the unit’s blower and coil assembly section.
12. Condensate Pump—Optional Component
a. Disconnect the condensate pump’s high-voltage wiring harness.
b. Remove the low-volt wires from terminal strips #24 and #55.
c. Pull the conduit and wires into the unit’s blower and coil assembly section.
13. GLYCOOL/Dual-Cool—Optional Component
a. On units with an actuator, unplug the valve actuator harness at the actuator and pull the
wire harness into the electric box.
b. Disconnect the glycol sensor from the control board and pull it into the unit’s blower and coil
assembly section.
14. Disconnect the air sail switch wires and pull them into the electric box.
15. Smoke Detector—Optional Component
a. Remove the smoke detector cover.
b. Remove the plug connector from the smoke detector and pull it into electric box.
c. Remove the wires from terminal strips #91, 92, 93 and route them into the smoke detector
box.
d. Remove the sensing tube from top of the smoke detector.
The wand and tube will remain attached to filter and electric box assembly.
16. Close the electric box cover and the accent panel.
17. Remove the pull bar that supports the accent panel from the left end of unit, otherwise it will fall
out when the compressor section is removed.
18. Evacuate and recover all refrigerant from the Liebert DS.
Air-cooled units are shipped with 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 Refrigeration 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.