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Quest 185 Cool
Installation, Operation and Maintenance Instructions
12
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Use the following procedure to connect the line set to the Dehumidifier:
1. Purge the inert gas from the dehumidifier by removing the rubber plugs in the liquid and gas lines to release the
inert gas before connecting the line set.
2. Place a field-provided heat shield, such as a wet rag, against the dehumidifier and around the piping stubs. The
heat shield must be in place to protect the cabinet from heat damage.
3. Swage the liquid and gas lines (if necessary) to fit onto the dehumidifier lines.
4. Purge the dehumidifier lines and the line set with dry nitrogen (Inert gas) to prevent oxidation during brazing.
Flow dry nitrogen into the lines at a low pressure of 1 to 2 psig.
5. Braze the line set lines to the dehumidifier lines.
6. Remove the heat shield after brazing and allow the connections to cool.
Use the following procedure to connect the line set to the Condensing Unit:
1. Cut the line set lines to the required length. Deburr the cut ends of the line set lines.
2. Fit the line stubs with flare fittings (included with the condensing unit) onto the line set if necessary.
3. Swage the liquid and gas lines (if necessary) to fit onto the line stubs with the flare fittings.
4. Remove service valve caps and cores.
5. Purge the lines with dry nitrogen (Inert gas) to prevent oxidation during brazing.
6. Braze the line set lines to the line stubs.
7. Apply a light coating of refrigeration oil to the flare fitting threads on the condensing unit valves.
8. Start each flare nut on the corresponding flare fitting on the condensing unit valves by hand, making sure the
threads are properly engaged. Tighten the flare nuts hand tight.
9. Carefully torque the flare nuts to the corresponding flare fittings on the condensing unit valves.
• Torque the liquid line flare nut to 13.3 ft-lbs.
• Torque the suction line flare nut to 30.1 ft-lbs.
10. Reinstall service valve cores and caps.
Note: Alternately, the stubs with the flare fittings can be connected to the condensing unit before brazing the line
set. In this case a field provided heat shield, such as a wet rag, must be placed over the flare fittings and valves on
the condensing unit to protect them from heat damage. The service valve cap and core should be removed before
brazing near stub tubes.
3-WAY VALVE
2-WAY VALVE
LIQUID LINE STUB
GAS LINE
STUB
SERVICE VALVE CAPS
VALVE ROD CAPS
VALVE STEMS
