Mitsubishi Electric EHSE-YM9EC User Manual

52
No. Fault symptom Possible cause Explanation - Solution
26
CoolingmodeisNOT
available.
DIPSW2-4isOFF. TurnDIPSW2-4toON.(Referto“6-5.DIPswitchsettings”.)
27
Thecoolingsystem
doesnotcooldownto
the set temperature.
1. Whenthewaterinthecirculationcircuitis
undulyhot,Coolingmodestartswithadelay
for the protection of the outdoor unit.
1. Normal operation
2. Whentheoutdoorambienttemperatureis
lowerthanthepresettemperaturethatacti-
vatesthefreezestat.function,Coolingmode
doesnotstartrunning.
2.
To runCoolingmodeoverridingthe freezestat.function,adjustthepreset
temperature that activates the freeze stat. function.
(Referto"Freezestatfunction"in"9-4.ServiceMenu"onPage28.)
28
The electric heaters
are activated shortly
afterDHWorLP
modestartsrunning
afterCoolingmode.
ThesettingtimeperiodofHeat-pump-onlyopera-
tion is short.
AdjustthesettingtimeperiodofHeat-pumponlyoperation.(Referto“Electric
heater(DHW)in"9-4.ServiceMenu"onPage26.
29
DuringDHWorLP
modefollowingthe
coolingmode,error
L6(circulationwater
freeze protection
error)occursandthe
system stops all the
operations.
TheunitrunsinCoolingmodewhentheoutdoor
ambienttemperatureislowerthan10ºC(outside
oftheguaranteedoperatingrange).
(Whendefrostingoperationisrunningatsucha
lowoutdoorambienttemperatureafterCooling
modeisswitchedtoDHWorLPmode,thewater
temperatureinthecoolingcircuitdropstoolow,
whichcouldresultinL6errortostopalltheopera-
tions.
DonotrunCoolingoperationwhentheoutdoorambienttemperatureislower
than10ºC.
ToautomaticallystoporrecoveronlyCoolingoperationandkeepotheropera-
tionsrunning,thefreezestat.functioncanbeused.Setthepresettemperature
that activates the freeze stat. function to adjust the outdoor ambient temperature
asfollows.(Referto"Freezestatfunction"in"9-4.ServiceMenu"onPage28.)
Outdoor ambient temperature Cooling operation
3ºChigherthanthepresettemperature Stop
5ºChigherthanthepresettemperature Recover
30
Theenergymonitor
value seems not cor-
rect.
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.
Service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"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.
Annual Maintenance
ItisessentialthatthehydroboxisservicedatleastonceayearbyaqualiedindividualanysparepartsrequiredMUSTbepurchasedfromMitsubishiElectric(safety
matter).
NEVERbypasssafetydevicesoroperatetheunitwithoutthembeingfullyoperational.
<Draining the hydrobox>
WARNING: DRAINED WATER MAY BE VERY HOT
1.Beforeattemptingtodrainthehydroboxisolatefromtheelectricalsupplytopreventboosterheaterburningout.
2.Isolatehydroboxfromprimarywatercircuitanddrainwaterfromhydrobox.Useasuitableheatresistanthosetoassistintheseoperations.
3.Drainanyremainingwaterfromboosterheaterusingtteddraincockandhosetosafelydraintheunit.
4.Afterthehydroboxisdrained,waterremainsinthefollowingcomponentparts.Drainwatercompletelybycheckingtheinsideoftheparts.
• Strainer(Removethestrainercover.)
• Pressurereliefvalve(Operatethevalve.)
<Annual maintenance points>
UsetheAnnualMaintenanceLogBook(in13-2.)asaguidetocarryingoutthenecessarychecksonthehydroboxandoutdoorunit.
Deliveredheatenergy
SW3-8
Heat meter
(Localsupply)
OFF Without
ON With
OCH590B

Mitsubishi Electric EHSE-YM9EC Specifications

General

Brand	Mitsubishi Electric
Model	EHSE-YM9EC
Category	Heat Pump
Language	English