Mitsubishi EHST20C-VM2C - Annual Maintenance

74
No. Fault symptom Possible cause Explanation - Solution
34 Theenergymonitorval-
ue seems not correct.
Note:
There could be some
discrepanciesbetweenthe
actual and the calculated
values.
If you seek for accuracy,
please make sure to
connectpowermeter(s)
and heat meter to FTC
board.
Both should be
locally supplied.
1.Incorrectsettingoftheenergymonitor 1.Checkthesettingbyfollowingtheprocedurebelow.
(1)CheckiftheDIPswitchissetasthetablebelow.
Consumedelectricenergy
SW3-4
Electricenergymeter
(Local supply)
OFF Without
ON With
(2)Inthecaseexternalelectricenergymeterand/orheatmeterisnotused,
checkifthesettingforelectricheaterandwaterpump(s)inputiscorrectby
referringto<Energymonitorsetting>in"9-4.Servicemenu".
(3)Inthecaseexternalelectricenergymeterand/orheatmeterisused,check
iftheunitofoutputpulseonexternalmetermatcheswiththeonesetatthe
mainremotecontrollerbyreferringto<Energymonitorsetting>in"9-4.Ser-
vicemenu".
2.Non-connectabletypeofexternalmeter(local
supply) is connected.
2.Checkiftheexternalmeter(localsupply)isconnectabletypebyreferringto
<Energymonitorsetting>"in"9-4.Servicemenu".
3.Externalmeter(localsupply)failure 3.CheckifsignalissenttoIN8toIN10properly.(Refertosection6.WIRING
DIAGRAM)
Replacetheexternalheatmeterifdefective.
4. FTC board failure 4. Check the FTC control board.
•Checkforfaultywiring.
•Ifnoproblemfoundwiththewiring,theFTCcontrolboardisfaulty.Replace
the board.
35 Heat pump is forced to
turn ON and OFF.
Smartgridreadyinput(IN11andIN12)isused,
andswitch-onandoffcommandsareinput.
Normal operation no action necessary.
Deliveredheatenergy
SW3-8
Heat meter
(Local supply)
OFF Without
ON With
Annual Maintenance
Itisessentialthatthecylinderunitisservicedatleastonceayearbyaqualiedindividual.AnysparepartsrequiredshouldbepurchasedfromMitsubishiElectric.
NEVERbypasssafetydevicesoroperatetheunitwithoutthembeingfullyoperational.
<Annual maintenance points>
UsetheAnnualMaintenanceLogBookasaguidetocarryingoutthenecessarychecksonthecylinderunitandoutdoorunit.
OCH570C