KMC Controls CSC-3000 Series - Troubleshooting; Maintenance; Important Notices

CSC-3000 Series Pneumatic VAV Reset Volume Controllers 7 Applications Guide, Rev G
Troubleshooting
NOTE: The controller should be set according
to the specications found on the
manufacturer’s label on the VAV box.
NOTE: The CSC-3000 series are position sensitive.
Be sure to mount the controller with
the correct orientation. See Mounting on
page 2. If the controller is calibrated in a
position other than the nal mounting
position, the calibration (minimum and
maximum ow limits) will be o.
NOTE: Thesecontrollersaretypicallyusedon
single-ductapplicationsbutmaybe
foundindual-ductapplications.(See,for
example,Dual Duct on page 13andDual
Duct, Constant Volume on page 14
.)When
workingondual-ductapplicationsitmay
benecessarytoworkononeductatatime.
Troubleshootingissuestoconsiderinclude:
• Isthereanadequatemainair(M)supply?
• Isthereadequateupstreamsystem(duct)air?
• Istheapplicationcorrectandpipedcorrectly?
SeeConnections on page 3,Determining the Type
of Reset on page 4
,andApplications on page 10.
•
Isthedamperaction(NC/NO)setcorrectly?Do
thedamper’sandcontroller’sactionmatch?See
Damper Action on page 4.
•
Isthedamperbinding?Willtheactuatordrive
thedamperfullopentofullclose?(Sucient
mainairisrequiredtoprovidetheactuatorwith
enoughforcetooperatethedamper/linkage.)Is
theactuatorleaking?(Evensmallleakscancause
theactuatortonotstroke.Youcantestforleaks
withasqueezebulbtoensuretherearenoleaks
attheactuatordiaphragmorings.)
• Doesthethermostatsendanadequatesignalto
thecontroller?
• AreLOSTATandHISTATsetcorrectlyforthe
thermostataction?Whencycled,canthecontrol-
lerrepeattheLOSTATandHISTATseings?If
theLOSTATorHISTATmustbesetfor“0”wc,
seethenotesaboutzero minimuminDIRECT
Reset Minimum and Maximum on page 4
orRE-
VERSE Reset Minimum and Maximum on page 5.
Maintenance
Noroutinemaintenanceisrequired.Eachcompo-
nentisdesignedandmanufacturedforreliability
andperformance.Carefulinstallationandusewill
ensurelong-termdependability.
CAUTION
Pneumatic devices must be supplied with clean,
dry control air. Any other medium (e.g., oil
or moisture contamination) will result in the
device’s eventual failure.
• Istheairowpickupproperlyplaced,anddoesit
sendagooddierentialpressuretothecontrol-
ler?(SeeConnections on page 3.)Istheairow
sensordirtyordefective?(Disconnectthesensor
fromthecontrollerbeforeaemptingtoblowthe
sensorclean!)
• Areresetstartandresetspansetcorrectly?See
Reset Start Point on page 6andReset Span on
page 6.
Important Notices
TheKMClogoisaregisteredtrademarkofKMC
Controls,Inc.Allrightsreserved.Nopartofthis
publicationmaybereproduced,transmied,tran-
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intoanylanguageinanyformbyanymeanswith-
outthewrienpermissionofKMCControls,Inc.
Thematerialinthisdocumentisforinformation
purposesonly.The contents and the product it de-
scribes are subject to change without notice.KMC
Controls,Inc.makesnorepresentationsorwarran-
tieswithrespecttothisdocument.Innoeventshall
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orincidental,arisingoutoforrelatedtotheuseof
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