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Mini Ceiling Mount
INSTALLING THE CONDENSING UNIT
DO NOT BLOCK
airflow through the
exterior housing. This will restrict
airflow and void the warranty.
Refrigerant Piping Overview
•
Using the charts and illustrations found above, route the line set between the evaporator unit and condensing unit. Be sure to
reference the chart for correct line set sizing. All horizontal suction piping should be pitched toward the condensing unit half
an inch for every 10 feet of pipe. When installing and routing the line set, cap both ends of each tube to prevent debris from
entering the tubing.
•
Prior to connecting the piping to the evaporator and condensing units, loosely connect a refrigerant manifold to the suction
and liquid line service valves.
•
Purge the hoses with dry nitrogen and tighten the hose connections.
•
Remove the service valve caps and turn the valve stem clockwise half a turn to unseat the valve and open the service
port. Keep the piping ports sealed until ready to braze.
•
Purge the fittings with dry nitrogen at a slow rate to prevent formation of highly abrasive copper oxide.
•
Perform all brazes.
•
Pressure test the system and check for leaks.
•
Insulate the suction line using wall cellular insulation or equivalent. Seal all seams with Armaflex 520 Foam Insulation
Adhesive or equivalent. Wrap each seam using line set tape.
Liquid Line Piping Procedure
•
Refer to the line set piping chart for liquid line size requirements.
•
Braze a short piece of copper tubing to the liquid line service valve.
•
Connect the supplied refrigerant drier to the tubing.
•
Downstream from the drier, connect the moisture-indicating sight glass in an easily visible location.
•
Run the tubing to the evaporator unit and attach to the liquid line connection on the evaporator unit.
Suction Piping Procedure
•
Connect an appropriately sized suction line to the suction line service valve on the condensing unit.
•
Run the pre-insulated suction line to the evaporator unit and attach to the suction line connection on the evaporator unit.
Brazing Procedure
•
Connect the bottle probe to the evaporator unit.
•
Fill a wine bottle 75% full of room-temperature water. Insert the bottle probe into the neck of the bottle as far as possible. It is
important that the bottle probe stopper be compressed by the neck of the bottle to ensure water will not leak.
•
Energize the evaporator unit and set the controller to call for cooling.
•
Verify that the setpoint on the control is set low enough to allow the unit to run for the entire length of the brazing,
evacuation, and charging procedure.
•
Remove the valve depressors from the gauge hoses on a four-valve manifold.
•
Connect the manifold to the low-pressure service valve port on the condensing unit and a nitrogen tank.
•
Open the suction line service valve and purge the system with nitrogen.
•
Braze all connections and cool off quickly.
•
Connect the high-pressure hose from the manifold to the liquid line service valve port.
•
Pressure test the system at 150 psi for 20 minutes.
•
Check all braze joints with leak detector or soap bubbles.
•
Release the nitrogen once it is confirmed that there are no leaks.
Evacuation
•
Remove the nitrogen tank from the manifold and attach the manifold to the refrigerant tank.
•
Mid-seat both service valves.
•
Install service caps on the valves.
•
Energize the liquid line solenoid valve.
•
After confirming that there is fresh oil in the vacuum pump, connect the 3/8” hose from the manifold to the pump.
•
Start the pump and run it until the micron gauge on the evaporator unit reads 500 microns or less.
•
Disconnect the vacuum pump from the system.
•
Break the vacuum by pressurizing the system to approximately 5 PSI with R-134a refrigerant.
•
Remove the micron gauge from the access valve.
