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.
Reconnecting Piping, Charging andReplacingPanels forDownflowDA050,DA080and
DA085
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 Piping and Refrigerant Requirements on page31, 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 DSE 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.
Re-assembly Checklist for DownflowDA050, DA080 and DA085
1. Thread-cutting bolts reconnected and torqued to 225 in-lb. (25 Nm)
2. Top cover plate attached to coil
3. Filter plate attached
4. High-voltage wires connected to proper contactors:
a. Compressor
b. Fan motor
c. Reheat, if applicable
d. Humidifier, if applicable
e. Condensate pump, if applicable
5. Low-voltage wires connected
a. Actuator
b. Terminal strip
c. Plug connections
d. Smoke detector, if applicable
6. Coil access plates on right and left replaced
7. Humidifier lines brazed
8. Suction and liquid refrigerant lines brazed
9. Vacuum pulled and unit checked for leaks
10. Unit recharged
11. Filters replaced
12. Panels replaced
B.4 Downflow DA125, DA150 and DA165 Disassembly
1. Remove the unit from its shipping skid before beginning.
2. Remove all panels except the top front accent.
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