5. Low-voltage wires connected
a. Actuator
b. Terminal strip
c. Plug connections
6. Suction and liquid refrigerant lines brazed
7. Vacuum pulled and unit checked for leaks
8. Unit recharged
9. Panels replaced
10. Filter plenum installed.
B.6 Upflow DA080 and DA085 Disassembly
1. Remove the unit from its shipping skid before beginning.
2. Remove all panels except the top front accent.
3. Remove all filters. 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 to ease connection.
Some cable ties must be cut and replaced. Refer to the unit’s wiring schematic on the unit’s
dead-front panel for details.
5. Label the three quick-connect plugs from the compressor compartment and disconnect them.
6. Disconnect the two CAN connections and cut the wire ties going to the EEV boxes in the
bottom of the compressor section.
7. Disconnect the compressor wire harness, including the crankcase heater wires, if present, from
the contactor in the electric box.
8. Pull the conduit and wires into the compressor compartment.
9. 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 filter and coil assembly section.
10. Humidifier-Optional Component
a. Disconnect the humidifier wire harness from the bottom of the contactor in the electric
box.
b. For infrared humidifiers: Remove the quick-connect plugs from the following low-voltage
connections: 35-5 and 35-6 (safety under pan), 35-3 and 35-4 (humidifier makeup valve),
and 8-5 and 8-7 (high water alarm).
c. Disconnect 35-3 and 35-4 from the control board.
d. Pull the conduit and wires into the unit's filter and coil assembly section.
11. 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 filter and coil assembly section.
12. Smoke Detector-Optional Component
a. Remove the smoke detector cover.
b. Remove the plug connector from the smoke detector and pull it into the 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 the bottom of the plastic elbow.
13. Close the electric-box cover and the accent panel.
14. Remove the pull bar that supports the accent panel from the left end of the unit, otherwise it
will fall out when the compressor section is removed.
15. Evacuate and recover all refrigerant from the DSE. Air-cooled units are shipped with a nitrogen
holding charge.
Vertiv | Liebert® DSE™ Installer/User Guide
90
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