Stulz BNB Series - 15 Troubleshooting

© STULZ GmbH, Hamburg EN / 10-2015 / 1000683
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STULZUltraSonic-SystemforDirectRoomHumidicationBNB-  Troubleshooting
15. Troubleshooting
Troubleshooting table
Situation Cause Solution Explanation
No mist
production
A1 Unit is not in
operation
Start up the unit; check function of control
system
If the upstream control system is not functioning,
neither can the unit function.
A2 No supply voltage Check electrical supply, ensure power is
supplied to the unit
If the electrical supply between the ultrasonic
humidierandthecontrolsystemisinterrupted,the
unit will not function.
A3 Not enabled Enablingbycontrolsystem,orushfunc-
tion active, setpoint was reached; check
control system parameters and reset if
necessary
If the control system does not enable the unit or
the unit is in "Flush mode", no mist is produced.
The fan stops.
A4 No supply of
demineralized
drinking water
Checkdrinkingwatersupply(alltapsopen,
on-siteltersclogged,etc.),ensureasup-
plyofwater,checkllvalve
ThelowwateroatswitchFS2wastriggeredbya
low water level, and has stopped the unit.
A5 Water level too
low
Check drinking water supply and upstream
water treatment system, ensure a supply,
checkllvalve,checkdrain
Ifthellvalvedoesnotopenorthedrainiscontin-
uouslyopen,asufcientlyhighwaterlevelcanno
longerbereached,thelowwateroatswitchFS2
stops the unit.
A6 Safety chain
triggered
CheckoatswitchesFS1andFS2,check
voltage 1,2 and X1,X2
Ifaoatswitchdoesnotswitchcorrectlyorthe
thermostat has switched, the unit stops the trans-
ducers and the fan
A7 Fan not
functioning
Check voltage X1, X2, check valve
mechanism
If the fan does not rotate despite the power being
on or is sluggish, it is faulty
A8 Water does not
drain freely
Check water drain and repair if necessary ThewatersupplyoatswitchFS1wastriggeredby
a high water level, and has stopped the unit. Water
mayescapefromtheoverow.
A9 Faulty nebulizer
unit
Check electrical supply H1,G1 If the transducers do not function despite the pow-
er being on, they are faulty.
Low mist
production
B1 Supply voltage
too low
Check transformer Ifthetransformerdoesnotgenerate48VAC(+/-
10%),thesupplyvoltageistoolowfornormal
operation.
B2 Unit is incorrectly
installed
Check that the unit is installed as described
in section "5.1.Humidierdistance"on
page 27.
If the unit is not horizontal, or if the mist cannot be
correctly distributed in the room due to incorrect
mounting, this will affect mist production.
B3 Worn atomizers Check operating hours, visually inspect
transducers
The capacity of the transducers declines if they are
dirty or have reached the end of their life.
B4 Request by con-
trol system
Check setpoints and actual values If the setpoint given by the control system is
approximately reached, depending on the control
system the transducers may only be requested to
actbriey.
B5 Inadequate
airow
Checkinstallation,fanandairlter Iftheairowvolumeistoolowduetoafaultyfan,
acloggedlteroranincorrectlyinstalledunit,this
directly affects mist production.
B6 Intake pressure
of demineralized
drinking water
too low
Check drinking water supply and upstream
water treatment system and ensure a sup-
ply if necessary; optimize supply channels
Iftheintakepressureattheultrasonichumidieris
insufcient,thellvalvecannotbeguaranteedto
open reliably.
Water escapes
from the
overow.
C1 "Upper water
level"oatswitch
is not triggered
Checkcorrectseatingandfunctionofoat
switch
ThewatersupplyoatswitchFS1shouldclose
the supply valve when the maximum water level is
reached.
C2 Supply valve does
not close
Check function of supply valve Ifthevalveisopen(e.g.clogging,mechanical
fault),waterisfedcontinuallytotheultrasonic
humidier.
C3 Drain is
obstructed
Check drain and drainage valve Ifthedrainisblocked,theushvalveisclosedor
the unit is not correctly installed, water may escape
fromtheoverow.