EngA AF Series

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AF / DCU MANUAL
IOM-52 2 of 23 Apr 13 R2
TABLEOFCONTENTS
Safetyprecautions.............................................................................................................................................................................3
Youhaveresponsibilitiestoo.............................................................................................................................................................3
Introduction.......................................................................................................................................................................................3
Warranty............................................................................................................................................................................................4
Parts...................................................................................................................................................................................................5
Receiving............................................................................................................................................................................................5
Temporarystorage.............................................................................................................................................................................5
Installation..........................................................................................................................................................................................6
Codes..................................................................................................................................................................................................6
Clearanceforairflow.........................................................................................................................................................................7
Qualifiedinstaller...............................................................................................................................................................................7
Refrigerationpipingrecommendations.............................................................................................................................................7
Undergroundrefrigerantpiping...............................................................................................................................................7
Pipingconnectionsizes.............................................................................................................................................................8
Traps.........................................................................................................................................................................................8
Liquidline.................................................................................................................................................................................8
Dischargeline...........................................................................................................................................................................8
Refrigerationspecialties(byothers).........................................................................................................................................9
Servicevalves(recommended).................................................................................................................................................9
Sightglass/moistureindicator(required).................................................................................................................................9
Liquidlinefilter‐drier(required)...............................................................................................................................................9
Liquidlinesolenoidvalve(required)......................................................................................................................................10
Thermostaticexpansionvalve(required)...............................................................................................................................10
Dischargecheckvalves...........................................................................................................................................................10
Refrigerationtable1equivalentlength..................................................................................................................................10
Refrigerationtable2(R410A)pipingguidelinesfornormalairconditioningduty................................................................11
Refrigerationtable2(R407C)pipingguidelinesfornormalairconditioningduty.................................................................12
Refrigerationtable2(R134a)pipingguidelinesfornormalairconditioningduty..........
.......................................................13
Refrigeratio
ntable3...............................................................................................................................................................14
Refrigerationtable4...............................................................................................................................................................14
Refrigerationpipingmaterialsandprocedures...............................................................................................................................15
Tubing.....................................................................................................................................................................................15
Leakchecking..........................................................................................................................................................................16
Evacuationanddehydration...................................................................................................................................................16
Refrigerantcharging.........................................................................................................................................................................17
Flushinganddegreasingofwaterandglycolcoils...........................................................................................................................18
Heattransferfluids.................................................................................................................................................................18
Shutdownprocedure.......................................................................................................................................................................18
Maintenance....................................................................................................................................................................................19
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maintenance.....................................................................................................................................................................19
Electrical...........................................................................................................................................................................................20
Beltadjustment................................................................................................................................................................................20
Setscrews.........................................................................................................................................................................................20
Motorlubrication.............................................................................................................................................................................21
Dampers...........................................................................................................................................................................................21
Controls............................................................................................................................................................................................21
Refrigeration....................................................................................................................................................................................22
Seasonalmaintenance............................................................................................................................................................22
Condenserfancontroltypicalsettings.......................................................................................Error!Bookmarknotdefined.
Troubleshootingchart.....................................................................................................................................................................22
©AirtexManufacturingPartnership.Allrightsreserved.