Mitsubishi EHST20C-VM2C User Manual

0
-25
-20
-15
-10
-5
5
0
10 20 30 40 50
41
Filling the cylinder unit (Primary circuit)
Draining the cylinder unit
WARNING: DRAINED WATER MAY BE VERY HOT
1.Beforeattemptingtodrainthecylinderunitisolatefromtheelectricalsupplytopreventtheimmersionandboosterheatersburningout.
2.IsolatecoldwaterfeedtoDHWtank.
3.AttachahosetotheDHWtankdraincock(No.23and24onFigure4-1and4-2).Thehoseshouldbeabletowithstandheatasthedrainingwatercouldbevery
hot.ThehoseshoulddraintoaplacelowerthantheDHWtankbottomtoencouragesiphoning.
Openahotwatertaptostartdrainingwithoutavacuum.
4. When the DHW tank is drained close drain cock and hot tap.
5.Attachhosetowatercircuitdraincock(No.7onFigure4-1and4-2).Thehoseshouldbeabletowithstandheatasthedrainingwatercouldbeveryhot.Thehose
shoulddraintoaplacelowerthantheboosterheaterdraincocktoencouragesiphoning.Openthepumpvalveandthestrainervalve.
6.Waterremainsinthestrainerstillafterthecylinderunitwasdrained.
Drainthestrainerbyremovingthestrainercover.
Initialllprocedure:
1.Ensureallpipejointsandttingsaretightandsecure.
2. Open the most distant DHW tap/outlet.
3.Slowly/graduallyopenthemainswatersupplytobeginllingunitandDHWpipework.
4.Allowmostdistanttaptorunfreeandrelease/purgeresidualairfrominstallation.
5.Closetap/outlettoretainfullychargedsystem.
Initialushprocedure:
1.Energisesystemtoheat-upcylindercontentstoatemperatureofapprox.30–40°C.
2.Flush/drainthewatercontentstoremoveanyresidue/impuritiesresultingfromtheinstallationworks.Usethecylinderdraincocktosafelydischargethewarmed
watertodrainviaasuitablehose.
3.Oncompletion,closedraincock,re-llsystemandresumesystemcommissioning.
Filling the cylinder unit (Potable/DHW circuit)
1.Checkandchargeexpansionvessel.
2.Checkallconnectionsincludingfactoryttedonesaretight.
3.Insulatepipeworkbetweencylinderunitandoutdoorunit.
4.
Thoroughlycleanandush,systemofalldebris.( Refer to 4.2 in the installation manual.)
5.Fillcylinderunitwithpotablewater.Fillprimaryheatingcircuitwithwaterandsuitableanti-freezeandinhibitorasnecessary.Alwaysuseallingloopwith
doublecheckvalvewhenllingtheprimarycircuittoavoidbackowcontaminationofwatersupply.
• Anti-freezeshouldalwaysbeusedforpackagedmodelsystems.Itistheresponsibilityoftheinstallertodecideifanti-freezesolutionshouldbeusedinsplit
modelsystemsdependingoneachsite’sconditions.Corrosioninhibitorshouldbeusedinbothsplitmodelandpackagedmodelsystems.
Figurebelowshows freezingtemperatureagainstanti-freezeconcentration.ThisgureisanexampleforFERNOXALPHI-11.Forother anti-freeze, please
refer to relevant manual.
• Whenconnectingmetalpipesofdifferentmaterialsinsulatethejointstopreventacorrosivereactiontakingplacewhichwilldamagethepipework.
6.Checkforleakages.Ifleakageisfound,retightenthenutontotheconnections.
7. Pressurise system to 1 bar.
8.Releasealltrappedairusingairventsduringandfollowingheatingperiod.
9.Topupwithwaterasnecessary.(Ifpressureisbelow1bar)
Freezingtemperature[°C]
Anti-freezeconcentration[%]
OCH570C

Mitsubishi EHST20C-VM2C Specifications

General

Brand	Mitsubishi
Model	EHST20C-VM2C
Category	Heat Pump
Language	English