NuAire Labgard NU-430-400 User Manual

OM0228 Page48of99
February/2014
Step4:Verifytheoperationofthemanualmodepressureswitchatthispoint.Lowertheexhaust
volumeto100CFM(170CMH)lowerthanthestandardexhaustloweralarmlimit.
 Turnoffmotor/blower
 Blockoffsupplyductconnectionusingcardboard.
 Lowerexhaustvolumetothepressureswitchlowtrippointstatedbelow.

Model LowAlarmLimit PressureSwitchLowTripPoint
 CFM(CMH) CFM(CMH)
NU‐430‐400 641(1089) 541(919)
NU‐430‐600 935(1589) 835(1419)

Ifpresent,removecardboardfromsupply‐airintakeandturnONtheunit’sblowerifitisnotONnow.
Remove1screwfromeachofthetoprightandleftsidesofthecontrolboxandrotatecontrolbox
forwardtoaccessandremovethepressureswitchadjustmentcap.Bringcontrolboxbacktovertical
positionandlooselythreadtheleftscrewofthecontrolbox.Pressureswitchmustbeadjustedin
verticalpositionsoleavetherightscrewofthecontrolboxoutsothepressureswitchcanbeaccessed
duringtheadjustment.Adjustasneeded(theadjustmentscrew),untiltheinternalsupplyblower/motor
isdeactivated.Thenraisetheexhaustvolumebackuptothestandardloweralarmlimittoensurethe
internalsupplyblower/motorturnsbackON.Finally,adjusttheexhaustsystembacktothecorrect
inflowvelocityandexhaustvolume.Reattachcontrolboxandinstallpressureswitchcap.

Step5: Ifpresent,removedirectreadinginstrumentfromwindowaccessopenarea.

7.5.3.2 E
xhaustVolumeCalibrationwiththeNU‐951‐012MotorizedButterflyValve

Ifdesired,activateexhaustcontrol/autozero.
TheexhaustcontrolautozerooptionallowstheNU‐951automaticdampertocheckitselfonceevery24hours
fromitsoriginalcalibrationpoint.Duringtheairflowcalibrationprocedure,oncethecertifiercalibratesthe
exhaustvolumethecontrolsystemwillrememberthedamperpositionindegreesatthat point.Thenbased
ontheprogrammedtime,theexhaustsystemwillperformthefollowingauto‐zerosequence.First,freezethe
exhaustdisplaytoitssetpoint.Thenmovethedamperbacktoitsoriginalcalibrationpoint.Allowthedamper
tocontrolnormallyfortwominutesthenunfreezethedisplay.Thissequencewillthen beperformedatthe
programmedtimeonceevery24hours.Theauto‐zerosequencecanbecheckedbypressingTESTtoinitiatea
fourminutetestsequence.

Toactivatetheexhaustcontrol/autozero,performthefollowing:

SelectOptionSetUp.



MEN
U
xx:xx AM xx/xx/xx
SETPOINTS/LIMITS
SENSOR SETUP
NIGHT SETBACK
SERVICE
OPTION SETUP
DIAGNOSTICS
CABINET RESET
CABINET TYPE
DAMPER CALIBRATION
UV
FL
UP
DOWN
ENTER

NuAire Labgard NU-430-400 Specifications

General

Brand	NuAire
Model	Labgard NU-430-400
Category	Air Conditioner
Language	English