Berner Maxair - Troubleshooting Guide

• Airstreamtooweak 
• Airsteamhitsobstruction
• Negativepressure
• Shaftrotatinginsidefan
• Onemotornotoperating
• Nozzlenotangledoutfarenough
• Unittoopowerful
• Airmovementtoocold
• Pushingairoutsidebuilding
SEEAIR IS NOT HITTING FLOORSYMPTOMS
• Switchturnedto“ON”position
• Thermostatnotsetproperly
• Coilsburnedoutduetolackofair
• Automaticresetthermalcutoutfailedinopenposition
• Manualresetthermalcutouttripped(ifsupplied)
• Speedsensornotdetectingtriggerrotation
• Withoutspeedadjustment,failedspeedsensor
• Adjustnozzletoproperposition,adjustmotorspeed;
seeinstallationinstructions
• Removeobstructionorrepositionaircurtain(moveout
 3/8”forevery1”upfromthedoor)
• Relievenegativepressurebyprovidingmakeupair
• Tightensetscrews
• Repairorreplacemotor
• Adjustnozzleangletooutside
• Adjustmotorspeed
• Addauxiliaryheattoovercomewindchillfactor
• Adjustdischargeanglebackintobuilding,adjustmotor
speed
• Replaceswitchorcheckwiring
• Changethermostatsetting
• Correctairowproblem;replacecoils
• Replaceautomaticthermalcutout
• Resetmanualthermalcutout
• Adjustgapbetweensensorandtrigger
• Replacespeedsensor
AIR IS NOT HITTING
FLOOR
UNEVEN AIR
EXCESSIVE AIR
MOVEMENT AT DOOR-
WAY
ELECTRICALLY HEATED MODELS
NO HEAT
MINIMAL HEAT
EXCESSIVE HEAT
STEAM/HOT WATER HEATED UNITS
EXCESSIVE HEAT
MINIMAL HEAT
NO AIR
• Powersupplylineopen(nopower)
• Fuseblown/circuitbreakertripped
• Motoroverloadtripped
• Failedswitch
• Checkpowersource,checkmethodofcontrolinON
position
• Replacefuse(s)/resetbreaker
• Internallyprotectedmotor-shouldresetautomatically
 aftercool-down,ifnot,replacemotor.
• Replaceswitch
MOTOR RUNNING/FANS ARE NOT ROTATING
MINIMUM AIR
ELECTRICAL CONTROLS NOT FUNCTIONING WHEN DOOR IS OPEN
X. TROUBLESHOOTING
SYMPTOMS REMEDY
CAUSE
NO SPEED
ADJUSTMENT
• Speedsensornotdetecting
triggerrotation
• Adjustgapbetweensensor&trigger/
replacesensor
• Brokenordamagedexiblehub
• Shaftrotatinginsidefan
• Selectorswitchisinoffposition
• Doorlimitswitchnotoperating
• Airdirectionaldischargevanesmis-adjusted
• Inadequateintakeclearance
• Blowermotoroperatesbelowspeed
• Fanrubbingagainsthousing
• Fanwheelscloggedwithdirt
• Faninbackwards
• Replacefansleeve/reengagecoupling
• Tightensetscrews/tightenfanonshaft
• Turnswitchto“ON”position
• Repairorreplacelimitswitch
• Adjustvanestoproperposition,seeinstructions
• Moveaircurtainorremoveobstruction
• Provideadequatespaceforaircurtain
• Impropervoltage
• Freefanfromhousing
• Cleanandvacuumfanwheels
• Checkfansforbladecurvetowarddischarge
• Thermostatinwronglocation-thermostattoo
closetodischarge
• Impropervoltage
• Thermostatnotsetproperly
• Speedsensornotdetectingtriggerrotation
• Incorrectspeedrange
• Thermostatinwronglocation
• Thermostatnotsetproperly
• Insufcientairovercoil
• Impropervoltage
• Toohighsteam/hotwaterpressure
• Inadequateairow,nspluggedup,dirtycoils
• Insufcientremovalofcondensation(steam)
• Notenoughsteampressure/watertemperaturetoo
low
• Intakeairbelowdesigntemperature

• Movethermostatawayfromairstream
• Supplypropervoltage
• Changetemperaturesetting
• Adjustgapbetweensensor&trigger/replacesensor
• Setdipswitchtoelectricheatedspeedrange
• Movethethermostatclosertoairstream
• Changetemperaturesetting
• Removerestrictiononintake
• Supplypropervoltage
• Reducesteampressure/hotwaterow
• Cleanintakeandcoils
• Increasetrapsize
• Raisepressureforsteam/increasewaterow
• Increasesteampressure/increasewaterow
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