Install Instructions
Table Of Contents
19
General Installation Guidelines
Due to our policy of continuous product innovation, some specifications may change without notification.
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GENERAL INSTALLATION GUIDELINES
Figure 22: Refrigerant Pipe Brazing.
Pressure-reducing
Valve
Valve
Taping
Nitrogen
Pipe to
be brazed
Refrigerant
Piping
Itisimperativetokeepthepipingsystemfreeofcontaminantsanddebrissuchascopper
burrs, slag, or carbondust duringinstallation. Contaminants can result in mechanical
failureofthesystem.
Brazing Practices
Piping Materials and Handling
All joints are brazed in the field. Duct Free System Single Zone Inverter refrigeration system components contain very small capillary tubes,
small orifices, electronic expansion valves, oil separators, and heat exchangers that can easily become blocked. Proper system operation
depends on the installer using best practices and utmost care while assembling the piping system.
•While brazing, use a dry nitrogen purge operating at a minimum pressure of three (3) psig and maintain a steady flow.
•Blow clean all pipe sections with dry nitrogen prior to assembly.
•Use a tubing cutter, do not use a saw to cut pipe. De-burr and clean all cuts before assembly.
•Store pipe stock in a dry place. Keep pipe capped and clean.
•Use adapters to assemble different sizes of pipe.
•Do not use flux, soft solder, or anti-oxidant agents.
•Use a 15% silver phosphorous copper brazing alloy to avoid overheating and produce good flow.
•Protect isolation valves, electronic expansion valves, and other heat-sensitive control components from excessive heat with a wet rag or a
heat barrier spray product.
Refrigerant Piping System Insulation
Allrefrigerantpiping,eld-providedisolationballvalves,servicevalves,andelbowsshallbecompletelyinsulatedusingclosedcellpipeinsulation.The
liquidandvaporlinesmustbeinsulatedseparately.
Topreventheatloss/heatgainthroughtherefrigerantpiping,allrefrigerantpipingincludingliquidlinesandvaporlinesshallbeinsulatedseparately.
Insulationshallbeaminimum1/2″thick,andthicknessmayneedtobeincreasedbasedonambientconditionsandlocalcodes.
Allinsulationjointsshallbegluedwithnoairgaps.Insulationmaterialshalltsnuglyagainsttherefrigerationpipewithnoairspacebetweenitandthe
pipe.Insulationpassingthroughpipehangers,insideconduit,and/orsleevesmustnotbecompressed.Protectinsulationinsidehangersandsupports
withasecondlayer.AllpipeinsulationexposedtothesunandoutdoorelementsshallbeproperlyprotectedwithPVC,aluminumvaporbarrier,or
alternativelyplacedinaweather-resistantenclosuresuchasapiperackwithatopcoverandmeetlocalcodes.
Thedesignengineershouldperformcalculationstodetermineifthefactory-suppliedinsulationjacketsaresufcienttomeetlocalcodesandavoid
sweating.Addadditionalinsulationifnecessary.Markallpipesatthepointwheretheinsulationjacketends.Removethejacket.Installeldprovided
insulationontherun-outandmaintrunkpipesrst.Peeltheadhesiveglueprotectorslipfromtheinsulationjacketandinstalltheclam-shelljacketover
thetting.
Forspecicinsulationprocedures,seeRefrigerant Piping Connectionssectioninthisinstallationmanual.