Hi‐TCentralizedcontroller
33
4.8 FAULTDIAGNOSTIC
4.8.1 ACTIVEALARMS
You can view the current alarms of the connected units. To do this, from the home page, press the triangle icon of danger, if
present;fromhereyoucanaccesstothelistofallactivealarmsinthesystem.
Also,whenyouareinan unitpage(i.e.Chillerpage,
seeParagraph3.4.1,andfancoilpage, seeParagraph3.4.2),bypressingthe
trianglethatappearsonthemachine,yougotoamenuwhereyoucanseecurrentalarmsoftheselectedmachine.
4.8.2 ALARMHISTORY
Thekeyboardmanagesadetectedalarmslistforalltheplantthatshowsthedateandtimeofthealarm,theaffectedmachineand
alarmtype.Inthehistoricarestoredupto100alarms,onceexceededthelimit,itautomaticallydeletestheolderalarms.
Togotothealarmhistory:
fromthesystemmainpage,gointo"Configuration"‐>"Servicemenu"‐>"Alarmlist".
Having maintainer password, you can set that the alarm history is also accessible from the user menu; to do this go into
"Configuration"‐>"Servicemenu"‐>"Parameters"‐>"Keyboar
d"‐>Par33/44:Enableuseralarmlog=1.
4.9 DOUBLESET‐POINTANDDEHUMIDIFICATIONFUNCTIONS
Thedoubleset‐pointfunctionintroducesasecondplantsideset‐point(bothincoolingmodeandinheatingmode).
Theapplicationfieldisprimarilythatofthefloorcoolingassistedbyfancoilfordehumidification.
Thepurposeoftheapplicationistopreventinanyconditiontheformationofcondensation
onthefloor,andinanycasetoensure
thewelfarethermohygrometric.
The activation of the double set‐point is by means of maintainer parameters (from System main page‐> Configuration‐>Service
menu‐>Parameters‐>Chiller‐>Chillername‐>H82:Enablesecondsetpoint≥2,ref.
chillermanualforallowablevalues).Mustalso
be set a digital output for controlling the three‐way valve used to divert the flow of water between the floor and fan coils. The
function ofhumidistat is instead carried out directly bythe remotecontrolHi‐T, by meansof its integrated
sensorsandthe logic
internallyimplementedrelatedtothecontrolofdewpointanddehumidification.
Please refer to the manual of the chiller for the correct setting of parameters related to the double set‐point, as well as for the
electricalconnectionstobedoneintheterminalboardof
thechiller.
Theset‐pointscanbesetwithdoubleset‐pointfunctionenabledare:
Setpoint SetpointonHi‐T
Setpointonboard
controlpanel
Summer Winter
Firstsetpoint(°C) Twater Coo/Hea 7(5÷18) 45(35÷55)
Firstsetpointeco(°C) TeaterECO 12(5÷18) 40(35÷55)
Secondsetpoint(°C) T2water Co2/He2 18(7÷23) 35(25÷45)
Secondsetpointeco(°C) T2waterECO 23(7÷23) 30(25÷45)
Table6.Setpointsettingswithenabledoublesetpoint.
Tomanagethesetpoint:
• fromHi‐T→“Set‐pointsetup”menu‐>“Chiller”‐>”Summer”o“Winter”(seeParagraph0).
• fromon‐bardcontrolpanel→SETbutton.
Thesecondsetpointisgreaterthanthefirstsetpointinsummerandlowerinwinter:
• in
summer:T
2
≥T
• inwinter:T
2
≤T
The parameters to be set for the management of dehumidification are accessible from the maintenance menu (Configuration‐>
Servicemenu‐>Parameters‐>Keyboard):
Parameter Name Unit Default Min. Max.
Par42/44 Dew‐pointtemp.margin °C 5.0 0.0 50.0
Par43/44 Min.stayingtimeindehumidification Seconds 300 0 600
Par44/44 Max.stayingtimeindehumidification Seconds 600 0 1200
Table7.Servicekeyboardparametersfordehumidification.
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