www .cellarcool .com | Page 35
CM9000 Twin-S
Refrigerant Piping Overview
•
Using the charts and illustrations found above, route the line set between the evaporator units and the 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
•
1/4” OD copper tubing is required for the liquid line on all systems .
•
Braze a short piece of 1/4” 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 units and attach to the liquid line connection on the evaporator units .
Suction Piping Procedure
•
Install an access valve at the outlet of the evaporator units .
•
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 units and attach to the suction line connection on the evaporator units .
Brazing Procedure
•
Connect the bottle probe to the master 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 master evaporator unit and set the controller to call for cooling .
•
Verify that the set point 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 .
•
Cap the access valve on the suction line .
•
Connect the high-pressure hose from the manifold to the liquid line service valve port .
•
Pressure test the system at 250 psig for 30 minutes .
•
Check all braze joints with leak detector or soap bubbles .
•
Release the nitrogen once it is confirmed that there are no leaks .
INSTALLING THE CONDENSING UNIT
