Mitsubishi EHST20C-VM2C User Manual

105
Annual Maintenance Log Book
Contractor name Engineername
Site name Site number
Cylinder unit maintenance record sheet
Warranty number Model number
Serial number
No. Mechanical Frequency Notes
1
TurnOFFwatersupply,drainDHWtank,removemeshfromstrainer
clean and replace in strainer. *1
2
KeepwatersupplyOFF,openhotwatertapsandchecktheprimary-side
expansionvesselchargepressure.Topupifnecessary(1bar).
3
KeepwatersupplyOFFandcheckthepotablevesselchargepressure.
Top up if necessary (3.5 bar).
4
KeepwatersupplyOFF.Inhardwaterareasde-scalingoftheimmersion
heaters may be required.
5
Droptheprimary/heatingsystempressuretozerocheckandifneces-
sarytopuptheexpansionvessel(1bar).Airvalveofexpansionvesselis
TR-412.
6
TurnwatersupplyON,openthepressurereliefvalveandthentheexpan-
sionreliefvalveinturn.Checkforunrestricteddischargetothetundish
andthatthevalvesreseatcorrectly.Checktherearenoblockagesinthe
tundishandassociatedpipework.
7
Checkandifnecessarytopuptheconcentrationofanti-freeze/inhibitor(if
used in the system).
8
Topuptheprimary/heatingsystemusingatemporarybackowpreven-
tionllingloopandre-pressuriseto1bar.
9
Heatsystemandcheckpressuredoesnotriseabove3barandnowater
is released from the safety valves.
10 Release any air from the system.
11
Tocheckthe3-wayvalveforinsideleaks,conrmthatthetemperatureof
theheatemitterdoesnotrisewhenrunningtheDHWmode.
Refrigerantmodelsonly[exceptEHPT20series] Frequency Notes
1 Refer to outdoor unit manual.
Electrical Frequency Notes
1 Check condition of cables.
2 Checkratingandfusettedontheelectricitysupply.
Controller Frequency Notes
1 Checkeldsettingsagainstfactoryrecommendations.
2 Checkoperationofmotorizedvalvesensuretheyreseatcorrectly.
3 Checkbatterypowerofwirelessthermostatandreplaceifnecessary.
Outdoor heat pump unit maintenance record sheet
Model number Serial number
Mechanical Frequency Notes
1 Inspectgrillandairinletfortrappeddebris/damage.
2 Check condensate drain provision.
3 Checkintegrityofwaterpipeworkandinsulation.
4 Check all electrical connections.
5 Checkandrecordtheoperationvoltage.
* Checks should be carried out once a year.
*1Besuretoreattachthemeshafterwashing.
Note:Withintherstcoupleofmonthsofinstallation,removeandcleanthecylinderunit’sstrainermeshplusanythatarettedexternaltothecylinder
unit. This is especially important when installing on an existing system.
Inadditiontoannualservicing,itisnecessarytoreplaceorinspectsomepartsafteracertainperiodofsystemoperation.Pleaseseetablesbelowfordetailedinstruc-
tions.Replacementandinspectionofpartsshouldalwaysbedonebyacompetentpersonwithrelevanttrainingandqualications.
Parts which require regular replacement
Parts Replace every Possible failures
Pressure relief valve (PRV)
Air vent (Auto/Manual)
Drain cock (Primary/Sanitary circuit)
Manometer
Inletcontrolgroup(ICG)*
6 years Waterleakage
*
OPTIONAL PARTS for UK
Parts which require regular inspection
Parts Check every Possible failures
Immersion heater 2 years
Earthleakagecausing
circuit breaker to activate
(HeaterisalwaysOFF)
Water circulation pump 20,000 hrs (3 years)
Water circulation pump
failure
Parts which must NOT be reused when servicing
*O-ring
* Gasket
Note: Always replace the gasket for pump with a new one at each regular
maintenance (every 20,000 hours of use or every 3 years).
OCH570C

Mitsubishi EHST20C-VM2C Specifications

General

Brand	Mitsubishi
Model	EHST20C-VM2C
Category	Heat Pump
Language	English