Mitsubishi Electric ecodan EHPT20Q-VM2EA User manual

CYLINDER UNIT
EHPT20Q-VM2EA
OPERATION MANUAL
For safe and correct use, please read this Manual thoroughly before operating the cylinder
unit and the outdoor unit.
This Operation Manual should be kept safe with the unit or in an accessible place for future
reference.
FOR USER
4
6
7
14
Contents
2. Introduction
3. Your Heating System
4. Customizing Settings for Your Home
5. Service and Maintenance
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................................
.....
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21. Safety Precautions ...................................

2
Safety Precautions
1
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WARNING
3
Safety Precautions
1
3
Note:
This symbol mark is for EU countries only.
This symbol mark is according to the directive 2012/19/EU Article 14 Information for
users and Annex IX, and/or to the directive 2006/66/EC Article 20 Information for end-
users and Annex II.
In the European Union there are separate collection systems for used electrical and electronic products, bat-
teries and accumulators.
Please dispose of this equipment, batteries and accumulators correctly at your local community waste
collection/recycling centre.
Contact your local Mitsubishi Electric dealer for country-specific details on disposal.
Please, help us to conserve the environment we live in.
ŰDisposal of the Unit
ƔDo not use sharp objects to press the buttons of the main controller as this will cause
damage to the buttons.
ƔIf power to unit is to be turned off for a long time, the water should be drained from the
system.
ƔDo not place a container etc. filled with water on the top panel.
<Figure 1.1>
Abbreviations and glossary
No. Abbreviations/Word Description
Space heating incorporating outdoor ambient temperature compensation
Coefficient of Performance (The efficiency of the heat pump)
Space heating through radiators or Underfloor heating
Indoor primary thermal store tank and component plumbing parts
Domestic hot water heating mode for showers, sinks, etc.
Temperature at which water is delivered to the primary circuit for thermal store or space heating
Space heating control routine to prevent water pipes freezing
Flow temperature controller (circuit board within cylinder unit that controls system).
Pressure relief valve
Temperature at which water is returned from the primary circuit for thermal store and space heating
Thermostatic radiator valve – a valve on the entrance or exit of the radiator panel to control the heat output
Compensation curve mode
COP
Cylinder unit
DHW mode
Flow temperature
Freeze stat function
FTC
Heating mode
PRV
Return temperature
TRV
1
2
3
4
5
6
7
8
9
10
11
ƔIn heating mode, to avoid the heat emitters being damaged by excessively hot water,
set the target flow temperature to a minimum of 2ºC below the maximum allowable
temperature of all the heat emitters.
ƔThis appliance is primarily intended for domestic use. For commercial applications this
appliance is intended to be used by expert or trained users in shops, in light industry
and on farms, or for commercial use by lay persons.
Your Mitsubishi Electric heating system products have been manufactured with high quality
materials and components which can be recycled and / or reused. The symbol in Figure 1.1
means that electrical and electronic equipment, batteries and accumulators, at the end of their
life, should be disposed of separately from your household waste.
If a chemical symbol is printed beneath the symbol (Figure 1.1), this chemical
symbol means that the battery or accumulator contains a heavy metal at a certain
concentration.
This is indicated as follows;
Hg: mercury (0.0005%), Cd: (cadmium (0.002%), Pb: lead (0.004%)
WARNING
CAUTION

4
Introduction
2
4. Evaporator
(Outdoor unit air heat exchanger)
1. Compressor
3. Expansion valve
1. The refrigerant within the circuit is compressed as it passes
through the compressor. It then becomes a hot highly pressurised
gas. The temperature also rises typically to 90°C.
2. The hot refrigerant gas then passes across one side of a heat ex-
changer. Heat from the refrigerant gas is naturally transferred to
the cooler side (water side) of the heat exchanger. As the tem-
perature of the refrigerant decreases, it naturally changes state
from a gas to a liquid.
3. Now as a cold liquid it still has a high pressure. To reduce the
pressure the liquid passes through an expansion valve. The pres-
sure drops but the refrigerant remains a cold liquid.
4. The final stage of the cycle is when the refrigerant passes into the
evaporator and evaporates. It is at this point when some of the
free heat energy in the outside air is absorbed by the refrigerant
and it returns to its original gas state.
The Mitsubishi Electric Air to Water (ATW) heat pump system con-
sists of the following components; outdoor heat pump unit and indoor
cylinder unit incorporating main controller.
The purpose of this Operational Manual is to inform users how their air source heatpump heating system works, how
to run the system at its most efficient and howto change settings on the main controller.
This should be kept safe with the unit or in an accessible place for future reference.
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Schematic of packaged cylinder system
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Heat pumps take electric energy and low grade heat energy from the
outdoor air to heat refrigerant which in turn heats water for domestic
use and space heating.
The efficiency of a heat pump is known as the Coefficient of Perfor-
mance or COP. This is the ratio of heat delivered to power con-
sumed.
Heat pumps are generally most efficient when providing water at
lower temperatures and when temperature difference between inlet
and outlet of the outdoor unit is large.
The operation of a heat pump is similar to a refrigerator in reverse.
This process is known as the vapour-compression cycle and the fol-
lowing is a more detailed explanation.
The first phase begins with the refrigerant being cold and low pres-
sure.
It is only the refrigerant that passes through this cycle; the water is
heated as it travels through the heat exchanger (Gas cooler). The
heat energy from the refrigerant passes through the heat exchanger
to the cooler water which increases in temperature. This heated
water forms the primary circuit and is circulated and used to serve
the space heating system and the thermal store tank.
The hot water stored within the tank is subsequently used to gener-
ate domestic hot water. (The tank water is NOT the actual hot water
that is typically used for shower or sink appliances.)
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Low temperature renewable
heat energy taken from the
environment (i.e. fresh air).
N:
N:N:
Heat energy
output
Electrical energy
input
2.Gas cooler
(water-refrigerant
heat exchanger)
5
Room temp.
sensor
Return temp. sensor
Flow temp. sensor
FTC
Built into the cylinder unit is the Flow Temperature Controller
(FTC).This device controls the function of both the outdoor
heat pump unit and the cylinder unit. The advanced technology
means that by using an FTC controlled heat pump you can not
only make savings compared to traditional fossil fuel type heat-
ing systems but also compared to many other heat pumps on
the market.
As explained in the earlier section, ‘How the Heat Pump
Works,’ heat pumps are most efficient when providing low flow
temperature water. The FTC advanced technology enables the
room temperature to be kept at the desired level whilst utilising
the lowest possible flow temperature from the heat pump, i.e.
operate most efficiently.
In room temp. (Auto adaptation) mode the controller uses tem-
perature sensors around the heating system to monitor space
and flow temperatures. This data is regularly updated and com-
pared to previous data by the controller to predict changes in
room temperature and adjust the temperature of water flowing
to the space heating circuit accordingly. By monitoring not only
the outdoor ambient, but the room and heating circuit water
temperatures, the heating is more consistent and sudden
spikes in required heat output are reduced. This results in a
lower overall flow temperature being required.
Important points about heat pump systems
ƔThe hot water produced by the heat pump is typically at a lower temperature than a fossil fuel boiler.
Implications
ƔIf the heat pump is being used for DHW the time at which tank heat up occurs should be scheduled using the
SCHEDULE function (see page 12). Ideally this should be during the night time when normally, less space heating
is required and economy electricity tariffs can be taken advantage of (see page 10).
ƔIn most situations space heating is best performed using the room temperature mode. This enables the heat pump
to analyse current room temperature and react to changes in a controlled manner utilising the specialised Mitsubishi
Electric controls.
ƔUsing the SCHEDULE and HOLIDAY functions prevent unnecessary Space or DHW heating when the property is
known to be unoccupied, for instance during the working day.
ƔDue to lower flow temperatures, heat pump heating systems should be used with large surface area radiators or
under-floor heating. This will provide a steady heat to the room whilst improving efficiency and so lowering running
costs of the system as the heat pump does not have to produce water at very high flow temperatures.
Ambient temp.
sensor
Air source heat pumps can provide both hot water and space heating all year. The system is different to a conven-
tional fossil fuel heating and hot water system. The efficiency of a heat pump is shown by its coefficient of perfor-
mance as explained in the introduction. The following points should be noted to achieve the most efficient and eco-
nomical operation of your heating system.
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Introduction
2

6
Your Heating System
3
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*1 Depending on the ambient conditions, it may not reach the set temperature.
*2 The cylinder's environment MUST be frost-free.
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Modes
Nominal thermal store tank volume
Overall unit dimensions
Weight (empty)
Weight (full)
Primary expansion vessel
(Accessory item) Nominal volume
Charge pressure
Safety device Control thermistor (THW1)
Control thermistor (THW3)
Pressure relief valve (2 No. devices)
Flow sensor
Manual reset thermostat
Manual reset thermostat
Thermal Cut-out
(for dry run prevention)
Water circuit
(Thermal store tank)
Boosterheater
Primary circuit circulating
pump Thermal store and space heating
Hot water supply
Connections Primary circuit
Secondary (potable) circuit
Target temperature range Space heating
Maximum secondary (potable) water supply pressure
Maximum primary working pressure
Minimum primary working pressure
DHW supply maximum temperature
Flow temperature *1
Room temperature
Guaranteed operating
range Ambient *2
Outdoor temperature
Electrical data Control board
Booster heater
Power supply (Phase, voltage, frequency)
Breaker (Local supply)
Power supply (Phase, voltage, frequency)
Capacity
Current
Breaker
Sound power level
Current
(+37490($
Space & DHW heating
200 L
1600 × 595 × 680 mm (Height × Width × Depth)
77 kg
283 kg
18 L or 25 L
1.0 bar (100 kPa)
42 - 72°C
80 °C
3.0 bar (300 kPa)
90 °C
121 °C
Min. flow 1.3 L/min
90 °C
Grundfos Solar PML 25-145 180
Grundfos Solar PML 25-145 180
φ 22.0
φ 22.0
25 - 60 °C
10 bar (1 MPa)
2.5 bar (250 kPa)
1.0 bar (100 kPa)
10 - 30 °C
40 - 70 °C
0 - 35 °C（80％RH)
- 15 - 35 °C
230V N〜50 Hz
20 A
230V N〜50 Hz
2 kW
8.7 A
16 A
40 dB(A)
12.8 A
7
F1 F2 F3 F4
B C D
E
A
<Main controller parts>
Letter Name Function
A Screen Screen in which all information is displayed
BMenu
CBack
Confirm Return to previous menu. D Used to select or save. (Enter key)
E Power/Holiday If system is switched off pressing once will turn
system on. Pressing again when system is
switched on will enable Holiday Mode. Holding the
button down for 3 secs will turn the system off. (*1)
F1-4 Function keys Used to scroll through menu and adjust settings.
Function is determined by the menu screen visible
on screen A.
*1
Main screen
<Main screen icons>
Icon Description
11 10 21
9
654
14 13
12
7
1Heat pump ‘Heat pump’ is running.
Defrosting.
Emergency heating.
2Electric heater When this icon is displayed the ‘Electric heaters’
(booster heater) are in use.
3Target
temperature Target room temperature
Target flow temperature
Compensation curve
4OPTION Pressing the function button below this icon will dis-
play the option screen.
5+ Increase desired temperature.
6- Decrease desired temperature.
7Z1 Z2 Pressing the function button below this icon switches
between Zone1 and Zone2.
Information Pressing the function button below this icon displays
the information screen.
8Space heating
mode Heating mode
Zone1 or Zone2
9DHW mode Domestic hot water heating mode
10 Holiday mode
When this icon is displayed ‘Holiday mode’ activated.
11 Timer is activated.
Prohibited
Server control is activated.
Stand-by
Stopped
Operating
12 Current
temperature Current room temperature
Current water temperature of thermal store tank
13 The Menu button is locked or the switching of the
operation modes between DHW and Heating opera-
tions are disabled in the Option screen.(*2)
14 SD memory card is inserted. Normal operation.
SD memory card is inserted. Abnormal operation.
*2 To lock or unlock the Menu, press the BACK and CONFIRM keys
simultaneously for 3 seconds.
To change the settings of your heating system please use the main controller located on the front panel of the cylinder
unit. The following is a guide to viewing the main settings. Should you require more information please contact your
installer or local Mitsubishi Electric dealer.
When the system is switched off or the power supply is disconnected, the
cylinder unit protection functions (e.g. freeze stat function) will NOT oper-
ate. Please beware that without these safety functions enabled, the indoor
unit and water pipe works may potentially become exposed to frost
damage.
Access to system settings for initial set up and
modifications.
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3
8
Customizing Settings for Your Home
4

8
Icon
Option screen
Main settings menu screen
Home screen
ƔHot water (DHW)
ƔHeating
ƔSchedule timer
ƔHoliday mode
ƔInitial settings
ƔService (Password protected)
To return to the main Settings menu press the BACK button.
ƔDate / Time
ƔSummer time
ƔTemp. display
ƔContact number
ƔTime display
Ɣ°C/°F
ƔRoom sensor settings
F1 F2 F3 F4
In general operation the screen displayed on the main controller will
be shown as in the figure on the right.
This screen shows the target temperature, space heating mode,
DHW mode, additional heat source being used, holiday mode, and
the date and time.
You should use the function buttons to access more information.
When this screen is displayed pressing F1 (for 1 second) will display
the current status and pressing F4 will take the user to the option
menu screen.
<Option screen>
This screen shows the main operating modes of the system.
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( ) and Timer ( ) for DHW and space heating, or detailed infor-
mation on energy or capacity.
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To access the main settings menu press button B ‘MENU’
The following menus will be displayed left to right :-
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1 Forced DHW — to turn ON/OFF press F1 (OFF - long press)
2 DHW operating mode — to change mode press F2
3 Space heating operating mode — to change mode press F3
4 Energy monitor
1. From the main settings menu use F2 and F3 buttons to highlight
‘Initial settings’ icon and select by pressing CONFIRM.
2. Use F1 and F2 buttons to scroll through the menu list. When the
required title is highlighted then press CONFIRM to enable / allow
edit.
3. Use the relevant function buttons to edit each initial setting then
press CONFIRM to save the setting.
The option screen allows quick setting of the following;
Note:
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To monitor the energy values in each operation mode for [month-to-date /
last month / the month before last / year-to-date / last year], press F4 to
access to the Energy monitor menu.
The following accumulated energy values are displayed :-
Initial settings that can be edited are
: Consumed electrical energy in total (month-to-date)
: Delivered heat energy in total (month-to-date)
Description
Hot water (DHW)
Heating
Schedule timer
Holiday mode
Initial settings
Service
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4
9
Customizing Settings for Your Home
4
Zone1 Zone2
A Room RC1-8 (one each
for Zone1 and Zone2) *
BTH1*
C**
* Not specified ( if a local-supplied room thermostat is used)
Room RC1-8 (one each for Zone1 and Zone2) (if a wireless remote control-
ler is used as a room thermostat)


Time/Zone schedule setting screen
<Room sensor settings>
For room sensor settings it is important to choose the correct room
sensor depending on the heating mode the system will operate in.
Please see also Installation Manual of the cylinder unit.
3. From Sensor setting screen, select a room sensor to be used for
monitoring the room temperature from Zone1 and Zone2 sepa-
rately.
4. From Sensor setting screen, select Time / Zone to make it pos-
sible to use different room sensors according to the time schedule
set in the Select Time/Zone menu. The room sensors can be
switched up to 4 times within 24 hours.
2. When 2-zone valve ON/OFF control is active and wireless remote
controllers are available, from Room RC zone select screen,
select zone No. to assign to each remote controller.
Control option
("Remote Controller Options"
(Installation manual))
Corresponding initial settings
room sensor
1. From the Initial settings menu select Room sensor settings.

10
The domestic hot water menu controls the operation of thermal store tank heat - ups.
Difference in temperature between DHW supply max. temp. and DHW
supply min. temp.
The time period after DHW mode when space heating has priority over
DHW mode temporarily preventing further stored water heating
(Only when DHW max. operation time has passed.)
The amount of stored hot water. DHW max. amount and DHW restart
amount can be selected. (See Figure 4.1)
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1. To edit the mode, press down the MENU button for 3 secs, then select “hot
water”.
2. Press F2 key to display the HOT WATER (DHW) SETTING menu.
3. Use F1 and F2 keys to scroll through the menu selecting each component
in turn by pressing CONFIRM. See the table below for description of each
setting.
4. Enter the desired number using the function keys and then press CON-
FIRM.
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DHW supply max. temp. *1 Desired temperature of supply hot water 40 - 70 °C 55
DHW supply max. temp. drop 15 - 30 °C 15
DHW max. operation time Max time allowed for stored water heating DHW mode 30 - 120 min 60
DHW mode restriction 30 - 120 min 30
DHW storage volume *2 Normal /
E. Save −Normal
*1 The DHW max. amount is 200L when the DHW storage volume set by the
installer is 'normal' and 150L when it is 'Energy save'.
Stop
Start
Restart
DHW mode DHW mode
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Start
DHW max.
operation time DHW mode restriction DHW mode
TLPH
TLPH
Stop
Stop Restart
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ƔWhen the DHW storage volume shows a decrease of 50 L from
the DHW max. amount, DHW mode operates and the flow from
the primary heating circuit is diverted to heat the water in the ther-
mal store tank.
ƔWhen the amount of the stored hot water reaches the ‘DHW max.
amount*1.’ or if the ‘DHW max. operation time’ set by the installer
is exceeded DHW mode ceases to operate. (See Figure 4.2)
ƔWhilst DHW mode is in operation primary hot water is NOT
directed to the space heating circuit.
ƔDirectly after DHW max. operation time ‘DHW mode restriction’
will routinely operate. The duration of this feature is set by the
installer and during its operation, DHW mode can not (normally)
be reactivated, allowing time for the system to deliver primary hot
water to the space heating if required. However,if at this time
there is no current demand for space heating, the system will au-
tomatically resume DHW mode. This will continue until the unit
receives a demand for space heating. (See Figure 4.3)
ƔAfter the ‘DHW mode restriction’ operation the DHW mode can
operate again and thermal store tank heating will continue ac-
cording to system demand.
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DHW restart amount
(6DYH 1RUPDO
200L
150L
150L
100L
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*1 Depending on the ambient conditions, it may possibly not reach the set temperature.
*2 Selection of E. Save will increase efficiency of operation. However, it should NOT be selected if there is concern about possible shortage of DHW
provision.
DHW max. amount
DHW max.
amount
DHW restart
amount
DHW max.
amount
DHW restart
amount
<Figure 4.2>
<Figure 4.3>
<Figure 4.1>
11
ƔHeating room temp. (Auto adaptation) ( )
ƔHeating flow temp. ( )
ƔHeating compensation curve ( )
Customizing Settings for Your Home
4
To edit compensation mode, press down the MENU button for 3 secs.
: Flow temp.
: Outdoor ambient temp.
The heating menus deal with space heating normally using either a radia-
tor, fan-coil, or underfloor heating system depending on the installation.
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There are 3 heating modes
Forced DHW
The Forced DHW function is used to force the system to operate in DHW mode. In normal operation the water in the
thermal store tank will be heated either to the set temperature or for the maximum DHW time, whichever occurs first.
However should there be a high demand for hot water ‘Forced DHW’ function can be used to prevent the system from
routinely switching to space heating and continue to provide DHW tank heating.
Forced DHW operation is activated by pressing button F1 and Back button in the ‘Option Screen’ . After Forced DHW
operation finishes, the system will automatically return to normal operation. To cancel forced DHW operation hold
down button F1 in the ‘Option Screen’.
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This mode is explained in detail in ‘Overview of Controls’ Section (page 5).
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The temperature of the water flowing to the heating circuit is set by the installer
to best suit the space heating system design, and user’s desired requirements.
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During late spring and summer usually the demand for space heating is natu-
rally reduced.To prevent the heat pump from producing excessive flow
temperatures for the primary circuit, the compensation curve mode can be
used to reduce flow temperatures, maximise efficiency and reduce running
costs.
The compensation curve is used to adjust the flow temperature of the primary
space heating circuit dependent on the outdoor temperature. The FTC uses
information from both an outdoor temperature sensor and a temperature
sensor on the primary circuit, supply to ensure the heat pump is not producing
excessive flow temperatures if current weather conditions do not require it.
Your installer will set the parameters of the graph depending on local condi-
tions and type of space heating used in your home. It should not be necessary
for you to alter these settings. If however you find that over a reasonable trial
operating period the space heating is not heating or is overheating your home,
please contact your installer so they can check your system for any problems
and update these settings if necessary.

12
Customizing Settings for Your Home
4
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13
Customizing Settings for Your Home
4
Note:
When scheduling heating, button F1 changes the scheduled variable between time
and temperature. This enables a lower temperature to be set for a number of
hours e.g. a lower temperature may be required at night when the occupants are
sleeping.
ƔThe schedule timer for space heating and DHW are set in the same way. How-
ever for DHW only time can be used as scheduling variable.
ƔA small rubbish bin character is also displayed choosing this icon will delete
the last unsaved action.
ƔIt is necessary to use the SAVE function F4 button to save settings. CONFIRM
does not act as SAVE for this menu.
Preview screen
Day of week select screen
Time of period setting screen 1
Time of period setting screen 2
5. In the preview menu screen press F4 button.
6. First select the days of the week you wish to schedule.
7. Press F2/F3 buttons to move between days and F1 to check or uncheck
the box.
8. When you have selected the days press CONFIRM.
9.The time bar edit screen will be displayed.
10.Use buttons F2/F3 to move to the point at which you do not want the se-
lected mode to be active press CONFIRM to start.
11.Use F3 button to set the required time of inactivity then press CONFIRM.
12.You can add up to 4 periods of inactivity within a 24 hour interval.
13.Press F4 to save settings.
The service menu is password protected to prevent accidental changes being
made to the operation settings, by unauthorised / unqualified persons.
Ű6HUYLFH0HQX

14
Service and Maintenance
5
Fault symptom Possible cause Solution
Cold water at taps
DHW is scheduled "OFF" Check schedule settings and change if necessary.
Heat pump or booster heater not working Contact installer.
Heating system does not get up
to set temperature. Prohibit, schedule or holiday mode selected Check settings and change as appropriate.
Incorrectly sized radiatorsor low flow rate setting Contact installer.
The room in which the temperature sensor is located is at
a different temperature to the rest of the house. Reposition the temperature sensor to a more suitable room.
Check the battery power and replace if flat.Battery problem *wireless control only
Air exists within pump A Contact installer.
System or power input is OFF. Turn on the power/system
After DHW operation room tem-
perature rises a little. Normal routine operation no action necessary.
Heating emitter is hot in the DHW
mode. (The room temperature
rises.)
The 3-way valve may have foreign objects in it, or hot
water may flow to the heating side due to abnormal
malfunctions.
All reserves of hot water from thermal store tank have been
used. Ensure DHW mode is operating and wait for thermal store tank to re-heat.
Contact installer.
Schedule function inhibits the
system from operating but the
outdoor unit is operational.
Freeze stat function may be active, to prevent freezing. Normal operation no action necessary.
Pump runs without reason for
short time. Pump jam prevention control routine to inhibit the build up
of scale. Normal operation no action necessary.
Mechanical noise (minor) heard
coming from cylinder unit Pump operates during hot water supply Normal operation no action necessary.
3-way valve changing position between DHW and heating
mode. Normal operation no action necessary.
Loosely supported pipe work. Contact installer.
Water discharges from one of the
pressure relief valves The system has overheated or overpressurised
Small amounts of water drip from
one of the pressure relief valves. Dirt may be preventing proper tight seal in the valve
An error code appears in the
main controller display. The indoor or outdoor unit is reporting an abnormal condi- tion Make a note of the error code number plus any other observation(s) and
contact installer.
<Power failure / outage>
Following any power failure (i.e. interrupted power input), ALL settings will be SAVED for a 1 week period only.
After 1 week, only Date / Time will be SAVED upon main controller.
Flow sensor jam / defect Contact installer.
Supply flow rate is too low. Increase the delivery amount. (open tap further.)
Twist the valve cap in the direction indicated until a click is heard. This
will release a small amount of water flushing dirt from the valve. Be
very careful the water released will be hot. Should the valve continue
to drip contact installer as the rubber seal may be damaged and need
replacing.
At the end of the DHW mode operation the 3-way valve
diverts hot water away from the thermal store tank into
space heating circuit. This is only temporary and done to
prevent system components from potential overheating.
The amount of hot water directed into the space heating
circuit is dependent on the pipe run between the outdoor
unit and the cylinder unit.
Booster heater switching on/off Normal operation no action required.
Air present in pump A Contact installer.
The following table is to be used as a guide to possible problems. It is not exhaustive and all problems should be
investigated by the installer or another competent person. Users should not attempt to repair the system themselves.
At no time should the system be operating with the safety devices by-passed or plugged.
Ű7URXEOHVKRRWLQJ
Switch off power to the cylinder unit and the booster heater then
contact installer.
Noisy pipework Air trapped in the system Try bleeding radiators (if present) If the symptoms persist contact
installer.
Abnormal cylinder noise during
delivery of domestic hot water
supply
15
Service and Maintenance
5
Parts which require regular inspection
Parts Check every Possible failures
Water circulation pump 1
(i.e. main heating circuit pump) 50,000 hrs (7 years) Water circulation pump failure
Parts which must NOT be reused when servicing
* O-ring
* Gasket
Parts which require regular replacement
Parts Replace every Possible failures
Pressure relief valve (PRV)
Air vent (Auto)
Manometer 6 years Water leakage
Maintenance to the cylinder unit and outdoor unit should be carried out annually by a competent person only. Users
should NOT try to service or replace parts of the cylinder unit by themselves. Failure to observe this instruction could
result in injury to the user, damage to the unit and invalidate product warranty.
In addition to routine annual servicing it is necessary to replace or inspect some parts after a certain period of system
operation. Please see tables below for detailed instructions.Replacement and inspection of parts should always be
done by a competent person with relevant training and qualifications.
Ű0DLQWHQDQFH

Printed in Japan
T968Z001H03
Installers: Please be sure to put your full contact address/telephone number on
this manual before handing it to the customer.
HEAD OFFICE :
TOKYO BUILDING 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
IMPORTER in Europe :
・MITSUBISHI ELECTRIC AIR CONDITIONNING SYSTEMS EUROPE LTD.
NETTLEHILL ROAD, HOUSTOUN INDUSTRIAL ESTATE, LIVINGSTON, EH54 5EQ,
SCOTLAND, U.K.
・MITSUBISHI ELECTRIC EUROPE B.V.
UK BRANCH :TRAVELLERS LANE, HATFIELD, HERTS., AL10 8XB, ENGLAND, U.K.