1-877-420-1330
Quest 185 Cool
Installation, Operation and Maintenance Instructions
15
www.QuestHydro.com
LINE SET INSTALLATION
CAUTION!
THE DEHUMIDIFIER IS SHIPPED FROM THE FACTORY PRESSURIZED WITH A CHARGE OF
INERT GAS AND WITH RUBBER PLUGS IN THE LINES. 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.
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 proper 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 prop-
erly 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 – If there is no pressure in the dehumidifier when the first plug is removed, check the dehumidifier for damage and
leaks before continuing with the installation.
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
