Ecodan 150 Standard, 250 Standard, 300 Standard, 210 Solar, 170 Standard Installation And Servicing Instructions

1

MITSUBISHI ELECTRIC PRE-PLUMBED UNVENTED MAINS PRESSURE WATER HEATER

WITH FTC5 CONTROL SYSTEM FOR USE WITH THE ECODAN

AIR SOURCE HEAT PUMP RANGE

150, 170, 210, 250 and 300 LITRE CAPACITY STANDARD MODELS

210, 250 and 300 LITRE CAPACITY SOLAR MODELS

150 and 170 LITRE CAPACITY SLIMLINE MODELS

INSTALLATION AND SERVICING INSTRUCTIONS

IMPORTANT: PLEASE READ AND UNDERSTAND THESE INSTRUCTIONS

BEFORE COMMENCING INSTALLATION. PLEASE LEAVE THIS MANUAL

WITH THE CUSTOMER FOR FUTURE REFERENCE.

2

CONTENTS

INTRODUCTION ....................................................................................................................................2

GENERAL REQUIREMENTS ................................................................................................................4

INSTALLATION – GENERAL ................................................................................................................16

INSTALLATION - DISCHARGE .............................................................................................................19

INSTALLATION - HEAT PUMP PRIMARY CIRCUIT .............................................................................22

INSTALLATION - SOLAR PRIMARY......................................................................................................31

INSTALLATION - IMMERSION HEATER ELECTRICAL SUPPLY.........................................................32

COMMISSIONING .................................................................................................................................33

MAINTENANCE ....................................................................................................................................34

FAULT FINDING & SERVICING ............................................................................................................36

SPARE PARTS ......................................................................................................................................36

USER INSTRUCTIONS .........................................................................................................................39

ENVIRONMENTAL INFORMATION ......................................................................................................40

TECHNICAL SUPPORT ........................................................................................................................ 40

INTRODUCTION

This range of factory pre-plumbed and wired unvented water heaters specically designed for use with the Mitsubishi Ecodan

Air Source Heat Pump range. The cylinder is manufactured in the UK from top quality materials and meets all the latest relevant
safety and constructional standards. The high grade Duplex stainless steel cylinder offers exceptional strength and corrosion
resistance. Its performance, control system and insulation levels exceed the latest requirements of Building Regulation Part L.

The unvented water heater can be fed directly from the cold water mains supply to the property without the need for separate

feed cisterns or vent pipes. It is supplied tted with all its necessary inlet and safety controls for compliance with Building
Regulations. Also tted are primary circulating pumps, a DHW circulation pump, primary to DHW plate to plate heat exchanger,
3 way diverter valve, automatic air vent, primary lling loop and pressure gauge, a cylinder thermal cut-out and Mitsubishi

Electric FTC5 controller. The pumps, motorised valve and thermal controls are supplied pre-wired. A heating and domestic hot
water programmer, The DHW expansion vessel is supplied loose for installation at a convenient position within the property.

An electric immersion heater is also tted to enable the unit to be heated should the heat pump require supplmentary heating

or be turned off.

NOTE: If using a sealed heating system, adequate provision for expansion within the primary circuit MUST be provided by

tting a primary circuit expansion vessel. Primary circuit expansion cannot be accommodated within the Air Source Heat
Pump cylinder. Ensure a primary circuit expansion relief valve is tted to the primary circuit.

The safety valves tted to the Air Source Heat Pump cylinder protect the water heater only. Failure to provide adequate

primary system pressure relief when using a sealed heating system will invalidate the Heat Pump warranty. Consult the Heat
Pump installation instructions for further advice.

3

IMPORTANT NOTE TO THE INSTALLER

The pre-plumbed cylinder is specically designed to be installed in conjunction with an air source heat pump. The pre-plumbed

cylinder is available in either STANDARD, SOLAR or SLIMLINE models.

Please read these instructions before commencing installation. Unvented cylinders are a controlled service as dened in
the latest edition of the building regulations and should only be carried out by a competent, qualied installer. The relevant

regulations are:
England and Wales - Building Regulation Part G Section G3
Scotland - Technical Standard Section 4
Northern Ireland - Building Regulation Part F
After installation the Benchmark log book and included commissioning sheets must be completed and left along with thes
instructions with the householder for future reference.

Any water distribution and central heating installation must comply with the relevant recommendations of the current version
of the Regulations and British Standards listed below:
Building Regulations
IEE Requirements for Electrical Installations (BS 7671)
Water Regulations
Manual Handling Operations Regulations
British Standards BS6798, BS5449, BS5540:1, BS5540:2, CP331:3, BS8558, BS7593 and BS7671
Health and Safety Document No. 635

Only qualied and/or competent individuals should install the Ecodan system. Mitsubishi Electric’s notes must not be taken

as overriding statutory obligations.
An annual inspection of the system will be required to ensure safe, long term operation.

The information in this manual is provided to assist generally in the selection of equipment. The responsibility for the selection

and specication of the equipment must however, remain with the installer and any designers or consultants concerned
with the design, specication and installation of the system. Please note: Mitsubishi Electric does not therefore accept any
responsibility for matters of design, selection or specication or for the effectiveness of an installation containing one of its
products unless specically requested to do so and expressly agreed in writing by Mitsubishi Electric at production stage.

All goods are sold subject to Mitsubishi Electric’s Terms and Conditions of Sale.

Important Note: Included with the Ecodan product is the Mitsubishi Electric user guarantee registration card. Please direct

the end user to register within 3 months of commissioning and ensure they benet from the applicable standard guarantee

for their Ecodan heat pump and any cylinder or interfacing equipment purchased from Mitsubishi Electric by you as installer.
The guarantee applies where the installation address is in England, Scotland or Wales only and for domestic use.

This registration card should be completed only by the end user/system owner so please ensure that the registration card

reaches them. The registration card is Free Post and is logged by our warranty department. In the unlikely event of failure
of the Ecodan heat pump or any such cylinder or interfacing equipment purchased from Mitsubishi Electric, return of the
card ensures that warranty claims are hassle free. For further information on the Mitsubishi Electric User Guarantee please
contact us by email: [e-mail] or telephone: [phone]. A sample of the Mitsubishi Electric User
Guarantee registration card is available on request and we can also provide an FAQ sheet to assist your users.

Please Note: If you do not complete and return the registration card then the product will only be guaranteed to the user by
Mitsubishi Electric for 12 months from the date of commissioning.

Our commercial guarantee to your user does not affect your user’s statutory rights or any consumer rights under applicable

national legislation.

NOTE: This manual is for revision B products only, manufactured on or after week 50 2017
see DATA label and drawing below for details

Year Week Revision

4

GENERAL REQUIREMENTS

IMPORTANT: THIS APPLIANCE CAN BE USED BY CHILDREN AGED FROM 8 YEARS AND ABOVE AND PERSONS WITH
REDUCED PHYSICAL SENSORY OR MENTAL CAPABILITIES OR LACK OF EXPERIENCE AND KNOWLEDGE IF THEY
HAVE BEEN GIVEN SUPERVISORY OR INSTRUCTION CONCERNING USE OF THE APPLIANCE IN A SAFE WAY AND
UNDERSTAND THE HAZARDS INVOLVED. CHILDREN SHALL NOT PLAY WITH THE APPLIANCE. CLEANING AND
USER MAINTENANCE SHALL NOT BE MADE BY CHILDREN WITHOUT SUPERVISION.

WARNING: Do not switch on if there is a possibility that the water in the heater is frozen.

COMPONENT CHECK LIST

Before commencing installation check that all the components for your Air Source Heat Pump cylinder are contained in the
package. The following components are supplied with your unit :

• Factory tted

Temperature and Pressure Relief Valve (set at 90°C/10bar)

Immersion heater and over-temperature cut-out
Expansion core unit (comprises expansion valve and check valve)
Tundish

Primary circulating pump (Low Loss Header to Heat Pump return) - Grundfos UPM GEO (150/170/210 litre models),

Grundfos UPMXL GEO (250/300 litre models)

Primary circulating pump (Low Loss Header to Heating circuit) - Grundfos UPM3 AUTO L (all models)
DHW circulating pump
3 Way motorised diverter valve
Primary to DHW plate to plate heat exchanger

Fernox TF1 Compact Magnetic lter
Primary circuit lling loop

Primary circuit pressure gauge
Automatic air vent
FTC5 Controller
Solar over-temperature thermal cutout (Solar models only)

• Supplied loose

Mitsubishi Electric CH/DHW Main Controller

Potable water expansion vessel
Cold water combination valve (comprises pressure reducing valve, strainer, check valve)

STORAGE AND HANDLING

Prior to installation the Pre-plumbed cylinder unit must be stored vertically upright on a secure, level surface in a dry, frost free
environment. Take note of the weight of the product and follow safe working practices when lifting, moving or manipulating
into position. DO NOT lift by the pre-plumbed pipework manifold.

SITING THE UNIT

The Pre-plumbed cylinder unit must be vertically oor mounted. It can be placed anywhere convenient provided the discharge
pipe(s) from its safety valves can be correctly installed and all pre-tted ancillary parts can be accessed for servicing and/or
maintenance. Areas that are subject to freezing must be avoided. Ensure that the oor is of sufcient strength to support the

“full” weight of the unit (Table 1, page 5). Pipe runs should be kept as short as possible for maximum economy.

Additional automatic air vents (AAV) (not supplied) may be required at high points in the primary system where pipework is
located above the level of the cylinder.

WATER SUPPLY

Bear in mind that the water supply to the property will be supplying both the hot and cold water requirements simultaneously.
It is recommended that the maximum water demand is assessed and the water supply checked to ensure this demand can
be satisfactorily met.

NOTE: A high water pressure will not always guarantee high ow rates.

Wherever possible the cylinder supply pipe should be 22mm. We suggest the minimum supply requirements should be 1.5

bar pressure and 20 litres per minute ow rate. However, at these values outlet ow rates may be poor if several outlets are
used simultaneously. The higher the available pressure and ow rate the better the system performance.

The cylinder has an operating pressure of 3.5 bar which is controlled by the cold water combination valve assembly. The cold
water combination valve assembly can be connected to a maximum inlet pressure of 16 bar.

5

OUTLET/TERMINAL FITTINGS (TAPS, ETC.)

The Pre-plumbed cylinder can be used in conjunction with most types of terminal ttings, plumbing ttings and pipework.
However, the rated pressures of any ttings selected should be checked for compatibility before installation.

NOTE: Accessories, plumbing ttings and pipework should have a rated operating pressure of at least 8 bar.

Outlets situated higher than the cylinder will give outlet pressures lower than that at the unit, a 10m height difference

will result in a 1 bar pressure reduction at the outlet tting.

LIMITATIONS

The Pre-plumbed cylinder should not be used in association with any of the following:

• Solid fuel boilers or any other boiler in which the energy input is not under effective thermostatic control, unless additional
and appropriate safety measures are installed.

• Ascending spray type bidets or any other class 1 back syphonage risk require that a type A air gap be employed.

• Steam heating plants unless additional and appropriate safety devices are installed.

• Situations where maintenance is likely to be neglected or safety devices tampered with.

• Water supplies that have either inadequate pressure or where the supply may be intermittent.

• Situations where it is not possible to safely pipe away any discharge from the safety valves.

• In areas where the water consistently contains a high proportion of solids, e.g. suspended matter that could block the

strainer unless adequate ltration can be ensured.

OPERATIONAL SUMMARY

Maximum mains supply pressure 1.6 MPa (16 bar)
Operating pressure 0.35 MPa (3.5 bar)
Expansion vessel pressure 0.35 MPa (3.5 bar)
Maximum design (Rated) pressure 0.8 MPa (8 bar)
Expansion relief valve setting 0.8 MPa (8 bar)

T&P relief valve setting 90°C/1.0 MPa (10 bar)

T&P relief valve manufacturers ref RWC PTEM 510003
Maximum primary circuit pressure 0.3 MPa (3 bar)

Maximum heating uid temperature 85oC

Storage capacity See Table 1 below
Weight when full See Table 1 below

OUTLINE SPECIFICATIONS

The cylinders are designed, constructed and tested for compliance with BS EN 12897:2006

Outer casing: White pre-painted corrosion resistant steel

Water container: Duplex stainless steel. 100% pressure tested to 1.5 MPa (15 bar).

Thermal insulation: CFC/HCFC free re retardant expanded polyurethane foam with zero ozone depletion potential. It has a

Global Warming Potential (GWP) of 3.1. Nominal thickness Standard and Solar units 60mm, Slimline units 50mm.

Table 1 - Unit Weights & Standing Heat Loss

Model Type

Nominal

Capacity

(litres)

Weight of

full unit (kg)

Weight of

unit (kg)

Standing Heat Loss

per day (kWh/24h) per year (kWh/365d)

Standard 150 206 56 1.19 434.4

Standard 170 232 62 1.32 481.8

Standard 210 279 69 1.57 573.1

Standard 250 327 77 1.67 609.6

Standard 300 387 87 1.89 689.9

Solar 210 284 74 1.56 569.4

Solar 250 332 82 1.63 595.0

Solar 300 392 92 1.84 671.6

Slimline 150 204 54 1.45 529.3

Slimline 170 230 60 1.63 595.0

6

Fig 1 - Parts identication

Temperature/Pressure
Relief Valve

Expansion Valve

Tundish

DHW circulating
pump

Scale Trap

DHW Drain o
point

Plate to Plate heat
exchanger

Solar controls housing
(Solar models only)

Solar coil connections
(Solar models only)

Flow sensor

Primary circulation
pumps

3 Way motorised
diverter valve

Low loss header

Automatic Air Vent

FTC5 Controller

Hot Water Outlet

Magnetic lter

Immersion heater
housing

Primary circuit
pressure gauge

Primary circuit
drain o point

Expansion vessel
tapping

Indicative Performance

Nominal capacity Type Hot water capacity Reheat time Nominal heat input

(litres) (litres) (minutes) (kW)

150 Slimline 144 92 4.83

170 Slimline 175 69 7.85

150 Standard 153 65 7.20

300 Standard 301 172 5.38

300 Solar 302 135 6.88

Average 6.43

NOTE: Heating times achieved using an Air Source Heat Pump with variable output power and boost heating to 60oC using

a 3kW immersion heater and a primary (heat pump) ow rate of 20 l/min. Test method in accordance with EN12897:2006

7

683.0

730

A

B

C

D

E

F

G

579

H

I

KEY
A OVERALL HEIGHT
B SECONDARY RETURN TAPPING
C HEAT PUMP FLOW CONNECTION (22mm O/D COPPER)
D TUNDISH OUTLET CONNECTION (22mm COMPRESSION)
E HEAT PUMP RETURN CONNECTION (22mm O/D COPPER)
F HEATING CIRCUIT FLOW CONNECTION (22mm O/D COPPER)
G HEATING CIRCUIT RETURN CONNECTION (22mm O/D COPPER)
H COLD WATER INLET CONNECTION (22mm COMPRESSION)
I HOT WATER OUTLET CONNECTION (22mm COMPRESSION / 3/4” BSP M)

CAPACITY 150 170 210 250 300

A 1130 1256 1508 1760 2074

B - - 1050 1175 1385

C 996 996 996 996 996

D 493 619 871 1123 1437

E 585 585 585 585 585

F 195 195 195 195 195

G 50 50 50 50 50

Fig 2a - Dimensions and EU Product Fiche- Standard models

MODEL 150 Standard 170 Standard 210 Standard 250 Standard 300 Standard

Energy efciency

class

B B C C C

Standing loss in W

50 55 65 70 79

Storage volume V in
Litres

150 170 210 250 300

Technical parameters in accordance with European Commission regulations 814/2013 and 812/2013

8

A

C

B

D

E

F

G

579

730

683

H

I

KEY
A OVERALL HEIGHT
B HEAT PUMP FLOW CONNECTION (22mm O/D COPPER)
C TUNDISH OUTLET CONNECTION (22mm COMPRESSION)
D HEAT PUMP RETURN CONNECTION (22mm O/D COPPER)
E HEATING CIRCUIT FLOW CONNECTION (22mm O/D COPPER)
F HEATING CIRCUIT RETURN CONNECTION (22mm O/D COPPER)
G SOLAR COIL CONNECTIONS (22mm COMPRESSION / 3/4” BSP M)
H COLD WATER INLET CONNECTION (22mm COMPRESSION)
I HOT WATER OUTLET CONNECTION (22mm COMPRESSION / 3/4” BSP M)

CAPACITY 210 250 300

A 1513 1765 2081

B 1346 1346 1346

C 877 1129 1444

D 935 935 935

E 545 545 545

F 400 400 400

G 372 372 372

Fig 2b - Dimensions and EU Product Fiche - Solar models

Solar coil specication:

Surface Area: 1.1m

2

Coil volume: 5.8 litres
Pressure drop: 3.6 kPa (0.036 bar)
Output rating: 30kW at 80oC ow temperature, 15

litres/minute ow rate
Connections: 22mm compression / 3/4” BSP male

Dedicated solar volume: 75 litres

MODEL 210 Solar 250 Solar 300 Solar

Energy efciency

class

C C C

Standing loss in W

65 68 77

Storage volume V in
Litres

210 250 300

Technical parameters in accordance with European Commission regulations 814/2013
and 812/2013

9

A

B

C

D

E

F

492

645

648

G

H

KEY
A OVERALL HEIGHT
B HEAT PUMP FLOW CONNECTION (22mm O/D COPPER)
C TUNDISH OUTLET CONNECTION (22mm COMPRESSION)
D HEAT PUMP RETURN CONNECTION (22mm O/D COPPER)
E HEATING CIRCUIT FLOW CONNECTION (22mm O/D COPPER)
F HEATING CIRCUIT RETURN CONNECTION (22mm O/D COPPER)
G COLD WATER INLET CONNECTION (22mm COMPRESSION)
H HOT WATER OUTLET CONNECTION (22mm COMPRESSION / 3/4” BSP M)

CAPACITY 150 170

A 1515 1689

B 1047 1047

C 909 1083

D 637 636

E 246 246

F 101 101

Fig 2c - Dimensions and EU Product Fiche- Slimline models

MODEL 150 Slimline 170 Slimline

Energy efciency

class

C C

Standing loss in W

60 68

Storage volume V in
Litres

150 170

Technical parameters in accordance with European Commission
regulations 814/2013 and 812/2013

10

150 170 210 250 300

Primary flow rate W50-W85-W112-HW140

Pump

Connecon size Heang/DHA (mm)

DHW Expansion vessel (litres) 12 18 18 24 24

Charge pressure (MPa (bar))

Control thermistor (

o

C)

Pressue Relief Valve (MPa (bar))

Control thermistor (

o

C)

Over-temperature cut-out (

o

C)

Temp/Pressure Relief Valve (

o

C/MPa (bar))

Expansion valve (MPa (bar))

Width

Depth

Height

Vessel

Type

Nominal thickness (mm)

Standing heat loss (kWh/24h)

Ozone Depl

eon Potenal

Global Warming Potenal

Electrical supply

Phase

Fuse rang - MCB Size (A)

Electrical supply

Phase

Rang (kW at 240V)

Max current (A)

Fuse rang - MCB Size (A)

PAR-WT50-E controller & PAR-WR51-E receiver

zero

3.1

220 - 240 V ~ , 50Hz

single

10

220 - 240 V ~ , 50Hz

single

3

13

16

DHW and 1 heang zone

80 +/- 5
90 / 1.0 (10.0)

0.8 (8.0)

Duplex stainless steel
Expanded polyurethane (PU)

60

Mechanical zones

Oponal wireles room thermostat and wireless receiver

STANDARD

0.35 (3.5)

22

Primary - 1 x Grundfos UPM3 + 1 x UPMGEO OR

1 x UPMXL GEO

DHW - Grundfos UPSO 15-60 CIL2

14.3 - 25.8 - 32.1 - 40.1 l/min

1-80

0.3 (3.0)

40 - 70

Dimensions (mm)

Weight empty/full (kg)

Materials

Insulaon

Electrical data

Control Board

(oponally powered

by outdoor unit)

Immersion heater

UNIT

Nominal hot water capacity (litres)

Water

Safety devices Primary circuit

DHW circuit

683 683 683 683 683

730 730 730 730 730

1130 1256 1508 1760 2074

1.19 1.32 1.57 1.67 1.89

56 / 206 62 / 232 69 / 279 77 / 327 87 / 387

Table 2 - STANDARD Cylinder Technical Data

11

210 250 300

Primary flow rate W50-W85-W112-HW140

Pump

Connecon size Heang/DHA (mm)

DHW Expansion vessel (litres) 18 24 24

Charge pressure (MPa (bar))

Solar coil heang surface (m2)

Control thermistor (

o

C)

Pressue Relief Valve (MPa (bar))

Control thermistor (

o

C)

Over-temperature cut-out (

o

C)

Temp/Pressure Relief Valve (

o

C/MPa (bar))

Expansion valve (MPa (bar))

Width

Depth

Height

Vessel

Solar heang coil

Type

Nominal thickness (mm

)

Standing heat loss (kWh/24h)

Ozone Depleon Potenal

Global Warming Potenal

Electrical supply

Phase

Fuse rang - MCB Size (A)

Electrical supply

Phase

Rang (kW at 240V)

Max current (A)

Fuse rang - MCB Size (A)

Immersion heater

Cylinder

UNIT

Nominal hot water capacity (litres)

Safety devices

Primary circuit

DHW circuit

Water

Mechanical zones

Oponal wireles room thermostat and wireless receiver

SOLAR

0.35 (3.5)

22

Primary - 1 x Grundfos UPM3 + 1 x UPMGEO OR

1 x UPMXL GEO

DHW Grundfos - UPSO 15-60 CIL2

DHW Grundfos

14.3 - 25.8 - 32.1 - 40.1 l/min

1 - 80

0.3 (3.0)

40 - 70

Dimensions (mm)

Weight empty/full (kg)

Materials

Insulaon

Electrical data

Control Board (oponally powered by outdoor unit

DHW and 1 heang zone

PAR-WT50-E controller & PAR-WR51-E receiver

zero

3.1

220 - 240 V ~ , 50Hz

single

10

220 - 240 V ~ , 50Hz

1.1

single

3

13

16
80 +/- 5

90 / 1.0 (10.0)

0.8 (8.0)

Duplex stainless steel
Expanded polyurethane (PU)

60

316L stainless steel

683 683 683

730 730 730

1513 1765 2081

1.56 1.63 1.84

82 / 332 92 / 392

74 / 284

Table 3 - SOLAR Cylinder Technical Data

12

150 170

Primary flow rate W50-W85-W112-HW140

Pump

Connecon size Heang/DHA (mm)

DHW Expansion vessel (litres) 12 18

Charge pressure (MPa (bar))

Control thermistor (oC)

Pressue Relief Valve (MPa (bar))

Control thermistor (oC)

Over-temperature cut-out (oC)

Temp/Pressure Relief Valve (oC/MPa (bar))

Expansion valve (MPa (bar))

Width

Depth

Height

Vessel

Type

Nominal thickness (mm)

Standing heat loss (kWh/24h)

Ozone Depleon Potena

l

Global Warming Potenal

Electrical supply

Phase

Fuse rang - MCB Size (A)

Electrical supply

Phase

Rang (kW at 240V)

Max current (A)

Fuse rang - MCB Size (A)

PAR-WT50-E controller & PAR-WR51-E receiver

zero

3.1

220 - 240 V ~ , 50Hz

single

10

220 - 240 V ~ , 50Hz

single

3

13

16

DHW and 1 heang zone

80 +/- 5
90 / 1.0 (10.0)

0.8 (8.0)

Duplex stainless steel
Expanded polyurethane (PU)

60

Mechanical zones

Oponal wireles room thermostat and wireless receiver

SLIMLINE

0.35 (3.5)

22

Primary - 1 x Grundfos UPM3 + 1 x UPMGEO

DHW Grundfos - UPSO 15-60 CIL2

14.3 - 25.8 - 32.1 - 40.1 l/min

1 - 80

0.3 (3.0)

40 - 70

Dimensions (mm)

Weight empty/full (kg)

Materials

Insulaon

Electrical data Control Board (opona

lly powered by outdoor unit

Immersion heater

UNIT

Nominal hot water capacity (litres)

Water

Safety devices

Primary circuit

DHW circuit

648 648

645 645

1515 1689

54 / 204 60 / 230

1.45 1.63

Table 4 - SLIMLINE Cylinder Technical Data

13

Setting up the UPM3 pump

When you switch on the pump it will run to the pre-set position or the last setting. The diagram below shows the current
operation status.

To change the pump setting, follow below:
(a) Press the ‘ ’ to switch to the settings view. The LEDs show the current setting for2 seconds.
(b) Release ‘ ’ for more than 2 seconds. The user interface shows the current performance in “operation status”.
(c) Press ‘ ’ for more than 2 seconds and the circulator switches to “setting selection”. The LEDs ash and show the

current setting mode. Please note that if the key lock is disabled, the circulator will not switch to “setting selection”.

In this case, unlock the key lock by pressing the button for 10 seconds.
(d) During a period of 10 seconds, press shortly on the ‘ ’ and the pump switches to the next setting.
(e) To select between the settings, instantly press the button until you nd the setting you want. If you pass the setting,

you will need to continue until the setting appears again. It is not possible to go back.
(f) Release ‘ ’ for more than 10 seconds and the user interfaces switches back to the performance view and the last

setting is stored.
(g) Press ‘ ’ and the display switches to the setting view and the LEDs show the current setting for 2 seconds.

(h) Release ‘ ’ for more than 2 seconds and the user interface switches back to the performance view.

1

1

1

2

2

2

3

3

3

MOD E U PM3 xx-7 0

MOD E U PM3 x x -7 0

MODE U P M3 x x-7 0

PRE-SET

MAX

Green LED

Yellow LED

LED not illuminated

KEY

14

Graph 1 - UPM3 performance curve

Control Mode explanation

Proportional pressure

The head pressure is reduced at falling heat demand

and increased at rising heat demand.

The duty point of the circulator will move up or down on

the selected proportional pressure curve depending on

the heat demand in the system.

• PP1: lowest proportional
pressure curve

• PP2: Intermediate
proportional pressure
curve

• PP3: Highest proportional
pressure curve

Constant pressure

The head pressure is kept constant, irrespective of the
heat demand.
The duty point of the circulator will move out or in on
the selected constant pressure curve, depending on the
heat demand in the system.

• CP1: lowest constant

pressure curve

• CP2: Intermediate

constant pressure curve

• CP3: Highest constant

pressure curve

Constant curve

The circulator runs on a constant curve, which means
that it runs at a constant speed or power.

The duty point of the circulator moves up or down the
selected curve, depending on the heat demand in the
system.

Constant

Curve

CC1 4 m

CC2 5 m

CC3 6 m

CC4

(max.)

7 m

Constant

Curve

CC4

(max.)

15

Graph 3 - UPMXL GEO performance curve

Graph 2 - UPM GEO performance curve

16

INSTALLATION – GENERAL

PIPE FITTINGS

The connection points to the heating system are in 22mm copper pipe. The use of appropriately sized COMPRESSION

FITTINGS is recommended when connecting to the pipes. Solder ttings can be used, but extreme care must be taken to
ensure any anciallry components in close proximity are not damaged by heat. Push t type ttings can be used for connection

to the copper pipes.

The inlet connection to the cold water combination valve is 22mm compression. The cylinder outlet tting is suitable for
connection to 22mm o/dia pipe (compression nut and olive supplied). The outlet is also threaded 3/4” BSP male parallel

should threaded pipe connections be preferred.

COLD FEED

A 22mm cold water supply is recommended, however, if a 15mm (1/2”) supply exists which provides sufcient ow, this may
be used. More ow noise may be experienced from small bore pipes due to the increased water velocity through them.

A stopcock or servicing valve should be incorporated into the cold water supply to enable the cylinder and its associated
controls to be isolated and serviced.

PRESSURE REDUCING VALVE (Fig 3 below)

The 3.5 bar pressure reducing valve can be connected anywhere on the cold water mains supply prior to the Air Source
Heat Pump cylinder. There is no requirement to site it close to the unit, it can be located at a point where the mains supply

enters the premises if this is more convenient but you must install a non-return valve just after the reducing valve for ease

of maintenance.

Fig 3 - Pressure reducing valve

Fig 4 - Pressure relief valve (8 bar)

PRESSURE RELIEF VALVE (Fig 4 above)

Should a balanced pressure cold water supply be required to cold water outlets such as thermostatic shower mixer valves or
combination taps, the cold water balanced draw off connection should be taken from between the pressure reducing valve
and the pressure relief valve (see Fig 4 above). Branches to cold drinking water outlets should be taken directly from the
mains supply.

EXPANSION VESSEL

The expansion vessel accommodates expansion that results from heating the water inside the unit. The expansion vessel
is pre-charged at 3.5 bar. The expansion vessel must be connected between the expansion valve (see Fig. 4 above) and
the cylinder by connecting it to the expansion vessel tapping on the cold feed pipe (see Fig 1 for position of tapping). The
location of the expansion vessel should allow access to recharge the pressure as and when necessary, this can be done
using a normal car foot pump. It is recommended that the expansion vessel is adequately supported. An expansion vessel

wall mounting bracket is supplied for this purpose and should be tted.

TUNDISH

The tundish is supplied factory tted . Ensure it is not postitioned directly over any electrical device in case any water splashes

occur in the event of a safety valve discharge.

Outlet to Megaflo eco

Mains in

22mm compression connection

Take note of flow
direction

Pressure reducing valve
cartridge (3.5 Bar)

22mm compression connection

Outlet to cylinder

From cold water
combination
valve

Take note of ow
direction

Pressure relief valve
discharge connection

Pressure relief valve
“TEE” (incorporates
check valve)

17

DRAIN TAPS

Drain taps are tted to both the primary system pipework and to the cold water inlet to facilitate draining the unit or indirect

heating circuit for maintenance purposes. It is recommended that the outlet point of the drain pipe work be at least 1 metre
below the level of the heater (this can be achieved by attaching a hose pipe to the drain tap outlet spigot).

HOT WATER OUTLET

Ideally the pipework from the cylinder to the outlet ttings should be in 22mm pipe with short runs of 15mm pipe to showers

and basin taps. Small bore pipe can also be used to suit some taps, but runs should be of minimum length. Pipe sizes may
vary due to system design.

SECONDARY CIRCULATION

If secondary circulation is required it is recommended that it be connected to the cylinder as shown in Fig 5 below via a swept

tee joint into the cold feed to the unit. NOTE: A SECONDARY CIRCULATION CONNECTION AT THIS POINT MUST NOT

BE USED ON SOLAR MODELS AS IT WILL DISTURB THE DEDICATED SOLAR VOLUME OF THE CYLINDER.

The secondary return pipe should be in 15mm pipe and incorporate a check valve to prevent backow. A suitable WRAS

approved bronze circulation pump will be required. On large systems, due to the increase in system water content, it may be

necessary to t an additional expansion vessel to the secondary circuit. This should be done if the capacity of the secondary

circuit exceeds 10 litres.

Pipe capacity (copper):

15mm O.D. = 0.13 l/m (10 litres = 77m)
22mm O.D. = 0.38 l/m (10 litres = 26m)
28mm O.D. = 0.55 l/m (10 litres = 18m)

Cold inlet

connection

Check

valve

Secondary
circulation

pump

Swept

tee

Cold

supply

Secondary

return

Fig 5 - Secondary circulation connection

A

B

C

D

T&P RELIEF

VALVE

DISCHARGE

PIPEWORK

TUNDISH

LEFT HAND

INSULATING PIECE

PLASTIC COVER DISCHARGE PIPE

RIGHT HAND

INSULATING PIECE

CLIP INTO

PLACE !

Fig 6 - T&P Relief Valve insulation

WARNINGS

i) Under no circumstances should the factory tted temperature/pressure relief valve be removed other than by authorised

service personnel. To do so will invalidate any guarantee or claim.

ii) The cold water combination valve must be tted to the mains water supply to the unit.

iii) No control or safety valves should be tampered with.
iv) The discharge pipe should not be blocked or used for any other purpose.

18

Fig 7 - Schematic installation diagram

Balanced cold water

draw-off

MCWS to Kitchen

(unbalanced cold

mains supply)

Incoming Cold

Water Main

Discharge pipe to atmosphere

(see page 12 “Installation - Discharge”)

HWS supply

Balanced HWS and

MCWS to bathrooms,

showers, cloakrooms,

etc

Pa

To space heating

circuit Zone 1

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

26

25

24

27

Parts shown within dashed

line are supplied

KEY

1 Heat Pump 13 Scale Trap 25 Primary circuit draw off point

2 Cylinder 14 DHW Circulating Pump 26 Automatic Air Vent

3 FTC5 Controller 15 Flow Sensor 27 Differential Pressure Bypass Valve

4 Immersion heater 16 Primary Pump (supplied loose

5 3.5 bar Pressure reducing Valve incorporating 17 Primary Expansion Vessel

Strainer and Check Valve (supplied loose) 18 Primary Pressure Relief valve

6 8 bar Expansion Valve and Check Valve 19 Magnetic Filter

7 DHW Expansion Vessel (supplied loose) 20 Primary System Pressure Gauge

8 Stop Cock 21 3 Way Motorised Diverter Valve

9 Mains Stop Cock 22 Low Loss Header incorporating ports for

10 Tundish 2nd heating zone and alternative heat source

11 Temperature/Pressure relief Valve 23 Primary Pump

12 Plate to PLate Heat Exchanger 24 DHW Drainoff point

19

INSTALLATION - DISCHARGE

It is a requirement of Building Regulation G3 that any discharge from an unvented system is conveyed to where it is visible,

but will not cause danger to persons in or about the building. The tundish and discharge pipes should be tted in accordance

with the requirements and guidance notes of Building Regulation G3. The G3 Requirements and Guidance section 3.50 -

3.63 are reproduced in the following sections of this manual. For discharge pipe arrangements not covered by G3 Guidance

advice should be sought from your local Building Control Ofcer. Any discharge pipe connected to the pressure relief devices
(Expansion Valve and Temperature/Pressure Relief Valve) must be installed in a continuously downward direction and in a

frost free environment.

Water may drip from the discharge pipe of the pressure relief device. This pipe must be left open to the atmosphere. The
pressure relief device is to be operated regularly to remove lime deposits and to verify that it is not blocked.

G3 REQUIREMENT
“...there shall be precautions...to ensure that the hot water discharged from safety devices is safely conveyed to where it is
visible but will not cause danger to persons in or about the building.”

Notes:
Discharge pipe-work D2 can now be a plastic pipe but only pipes that have been tested to a minimum 110°C must be used.
Discharge pipe D2 can now be plumbed into the soil stack but only soil stacks that can handle temperatures of 99°C or
greater should be used.

The following extract is taken from the latest G3 Regulations

Discharge pipe D1

3.50 Safety devices such as temperature relief valves or combined temperature and pressure and pressure relief valves
(see paragraphs 3.13 or 3.18) should discharge either directly or by way of a manifold via a short length of metal pipe (D1)
to a tundish.

3.51 The diameter of discharge pipe (D1) should be not less than the nominal outlet size of the temperature relief valve.

3.52 Where a manifold is used it should be sized to accept and discharge the total discharge form the discharge pipes
connected to it.

3.53 Where valves other than the temperature and pressure relief valve from a single unvented hot water system discharge

by way of the same manifold that is used by the safety devices, the manifold should be factory tted as part of the hot water

storage system unit or package.

Tundish

3.54 The tundish should be vertical, located in the same space as the unvented hot water storage system and be tted as

close as possible to, and lower than, the valve, with no more than 600mm of pipe between the valve outlet and the tundish
(Fig. 8 & Table 5, page 21).

Note: To comply with the Water Supply (Water Fittings) Regulations, the tundish should incorporate a suitable air gap.

3.55 Any discharge should be visible at the tundish. In addition, where discharges from safety devices may not be apparent,
e.g. in dwellings occupied by people with impaired vision or mobility, consideration should be given to the installation of a
suitable safety device to warn when discharge takes place, e.g. electronically operated.

Discharge pipe D2

3.56 The discharge pipe (D2) from the tundish should:
(a) have a vertical section of pipe at least 300mm long below the tundish before any elbows or bends in the pipework (see
Diagram 1, G3), (Fig. 8, page 21); and
(b) be installed with a continuous fall thereafter of at least 1 in 200.

3.57 The discharge pipe (D2) should be made of:
(a) metal; or
(b) other material that has been demonstrated to be capable of safely withstanding temperatures of the water discharged

and is clearly and permanently marked to identify the product and performance standard (e.g. as specied in the relevant

part of BS 7291).

3.58 The discharge pipe (D2) should be at least one pipe size larger than the nominal outlet size of the safety device
unless its total equivalent hydraulic resistance exceeds that of a straight pipe 9m long, i.e. for discharge pipes between 9m
and 18m the equivalent resistance length should be at least two sizes larger than the nominal outlet size of the safety device;

between 18 and 27m at least 3 sizes larger, and so on; bends must be taken into account in calculating the ow resistance.

(See Diagram 1, Table 1, G3), (Fig. 8 & Table 5, page 21) and the worked example.

20

Note: An alternative approach for sizing discharge pipes would be to follow Annex D, section D.2 of BS 6700:2006 Specication

for design, installation, testing and maintenance of services supplying water for domestic use within buildings and their
curtilages.

3.59 Where a single common discharge pipe serves more than one system, it should be at least one pipe size larger than
the largest individual discharge pipe(D2) to be connected.

3.60 The discharge pipe should not be connected to a soil discharge stack unless it can be demonstrated that that the soil
discharge stack is capable of safely withstanding temperatures of the water discharged, in which case, it should:

(a) contain a mechanical seal, not incorporating a water trap, which allows water into the branch pipe without allowing foul
air from the drain to be ventilated through the tundish;
(b) be a separate branch pipe with no sanitary appliances connected to it;
(c) if plastic pipes are used as branch pipes carrying discharge from a safety device they should be either polybutalene
(PB) to Class S of BS 7291-2:2006 or cross linked polyethylene (PE-X) to Class S of BS 7291-3:2006; and
(d) be continuously marked with a warning that no sanitary appliances should be connected to the pipe.

Note:

1. Plastic pipes should be joined and assembled with ttings appropriate to the circumstances in which they are used as set

out in BS EN ISO 1043-1.

2. Where pipes cannot be connected to the stack it may be possible to route a dedicated pipe alongside or in close proximity
to the discharge stack.

Termination of discharge pipe

3.61 The discharge pipe (D2) from the tundish should terminate in a safe place where there is no risk to persons in the
vicinity of the discharge.

3.62 Examples of acceptable discharge arrangements are:

(b) to a trapped gully with the end of the pipe below a xed grating and above the water seal;

(c) downward discharges at low level; i.e. up to 100mm above external surfaces such as car parks, hard standings, grassed
areas etc. are acceptable providing that a wire cage or similar guard is positioned to prevent contact, whilst maintaining
visibility; and
(d) discharges at high level: e.g. into a metal hopper and metal downpipe with the end of the discharge pipe clearly visible
or onto a roof capable of withstanding high temperature discharges of water and 3m from any plastic guttering system that
would collect such discharges.

3.63 The discharge would consist of high temperature water and steam. Asphalt, roong felt and non-metallic rainwater

goods may be damaged by such discharges.

Worked example of discharge pipe sizing

Fig. 8, page 21: shows a G1/2 temperature relief valve with a discharge pipe (D2) having 4 No. elbows and length of 7m from

the tundish to the point of discharge.

From Table 5, page 21:

Maximum resistance allowed for a straight length of 22mm copper discharge pipe (D2) from a G1/2

temperature relief valve is 9.0m.
Subtract the resistance for 4 No. 22mm elbows at 0.8m each = 3.2m

Therefore the permitted length equates to: 5.8m

5.8m is less than the actual length of 7m therefore calculate the next largest size.

Maximum resistance allowed for a straight length of 28mm pipe (D2) from a G1/2 temperature relief valves equates to 18m.

Subtract the resistance of 4 No. 28mm elbows at 1.0m each = 4.0m

Therefore the maximum permitted length equates to: 14m

As the actual length is 7m, a 28mm (D2) copper pipe will be satisfactory.

WARNINGS:

• Under no circumstances should the factory tted temperature/pressure relief valve be removed other than by a competent
person. To do so will invalidate any guarantee or claim.

• The cold water combination valve assembly must be tted on the water supply to the Pre-plumbed cylinder.

• No control or safety valves should be tampered with or used for any other purpose.

• The discharge pipe should not be blocked or used for any other purpose.

• The tundish should not be located adjacent to any electrical components.

21

Table 5 - Sizing of copper discharge pipe (D2) for common temperature relief valve outlet sizes

600mm maximum

300mm

minimum

Safety device

(e.g. Temperature

relief valve)

Metal discharge pipe (D1) from

Temperature relief valve to tundish

Tundish

Discharge below

xed grating

(Building Regulation

G3 section 3.61 gives

alternative points

of discharge)

Fixed grating

Trapped

gully

Discharge pipe (D2 from tundish,
with continuous fall. See Building

Regulation G3 section 3.56,

Table 4 and worked example)

VALVE OUTLET SIZE

MINIMUM SIZE OF
DISCHARGE PIPE

D1

MINIMUM SIZE OF
DISCHARGE PIPE

D2 FROM TUNDISH

MAXIMUM

RESISTANCE

ALLOWED,

EXPRESSED AS

A LENGTH OF

STRAIGHT PIPE (i.e.

NO ELBOWS OR

BENDS)

RESISTANCE

CREATED BY EACH

ELBOW OR BEND

G 1/2 15mm

22mm
28mm
35mm

UP TO 9m
UP TO 18m
UP TO 27m

0.8m

1.0m

1.4m

G 3/4 22mm

28mm
35mm
42mm

UP TO 9m
UP TO 18m
UP TO 27m

1.0m

1.4m

1.7m

G1 28mm

35mm
42mm
54mm

UP TO 9m
UP TO 18m
UP TO 27m

1.4m

1.7m

2.3m

NOTE: The above table is based on copper tube. Plastic pipes may be of different bore and resistance. Sizes and maximum
lengths of plastic should be calculated using data prepared for the type of pipe being used.

Fig. 8: Typical discharge pipe arrangement (extract from Building Regulation G3 Guidance section 3.5)

22

INSTALLATION - HEAT PUMP PRIMARY CIRCUIT

HEAT PUMP SELECTION

• The Pre-plumbed cylinders are suitable for use with the Mitsubishi Electric Ecodan Air Source heat pumps listed in Table
6 below

• If in doubt consult Mitsubishi Electric for further advice.

• Solid fuel boilers or any other boiler in which the energy input is not under effective thermostatic control unless additional
and appropriate safety measures are installed should NOT be used.

• The primary circuit can either be a sealed system or open vented type, maximum primary circuit pressure 3 bar.

• The primary ow from the heat pump MUST be pumped. Gravity circulation will not work due to the special design of the

primary heat exchanger.

• The heat pump cannot be vented through the Pre-plumbed cylinder unit.

Cylinder/HP Matrix

150Std 170Std 210Std 250Std 300Std 150Slim 170Slim 210Solar 250Solar 300Solar

X X X X X X

X X X X X X X X

X X X X X X X X

X X X X X X

Heat pump output kW

5

8.5

11.2

14

WATER QUALITY AND SYSTEM PREPARATION

General

The water in both primary and DHW circuits should be clean and with a pH value of 6.5 to 8.0
The following values should not be exceeded in the water supply conditions:

Calcium: 100mg/L
Ca hardness: 250mg/L
Chlorine: 100mg/L
Chloride: 250mg/L
Copper: 0.3mg/L
Iron/Manganese: 0.5mg/L
Other constituents should comply with European Directive 98/83 EC

In known hard water areas, to minimise any scaling the stored DHW temperature should be restricted to 60oC

Anti-freeze

Anti-freeze solutions MUST use propylene glycol with a toxicity rating of Class 1 as listed in the Clinical Toxicology of

Commercial Products, 5th Edition

Note:

1. Ethylene glycol is toxic and MUST NOT be used in the primary water ciruit in case of any cross contamination of the
potable water circuit

2. For 2 zone valve ON/OFF control, propylene glycol MUST be used

New and Existing Installations (primary water circuit)

Before connecting the outdoor unit, thoroughly cleanse the primary pipework of building debris, solder, uxes, etc. using a

suitable chemical cleansing agent.

Flush the system to remove the chemical cleanser
For all packaged model systems add a combined inhibitor and anti-freeze solution to prevent damage to the pipework and

system components.

For split model systems the responsible installer should decide if anti-freeze solution is necessary for each site’s conditions.

Corrosion inhibitor however should always be used.

When using chemical cleansers and inhibitors always follow the manufacturer’s instructions and ensure the product is

appropriate for the materials used in the water circuit.

Minimum amount of water required in the space heating circuit and required ow rates

Outdoor heat pump unit Min water content Required ow rate
PUHZ-W50 40 litres 14.3 L/min
PUHZ-W85 60 litres 25.8 L/min
PUHZ-W112 80 litres 32.1 L/min
PUHZ-HW140 100 litres 40.1 L/min

Table 6

23

Primary Flow

Secondary Z1 Flow

Secondary Z2 Flow

Secondary Z2 Return

Primary Return

Secondary Z1 Return

TBO.1 1-2 (OUT1)

TBO.1 5-

6 (OUT13)

TBO.4 1-2 (OUT3)

MAIN CONTROLLER FLOW RATE LOOK UP

The main controller can now show you the ow rates by using Request Code 540 in the Service Menu (see FTC5 main manual).

WIRING

All electrical wiring should be carried out by a competent electrician and be in accordance with the latest I.E.E. Wiring
Regulations.

The Pre-plumbed cylinder thermal controls, primary circulating pumps are factory pre-wired. Further wiring will be required
between the FTC5 controller, the programmer, room temperature sensor and the Heat Pump. Additional controls and wiring

will be required if a second CH zone is to be tted to the instalation.

Any thermal controls and over-temperature thermal cut-outs MUST NOT be bypassed.

The mains supply must be via a double pole isolating switch with a contact separation of at least 3mm in both poles. The
supply must be fused 10 amp. A supply cable of 1.0 to 1.5mm2 cross sectional area should be used.

THIS APPLIANCE MUST BE EARTHED

HEATING SYSTEM CONTROLS

The controls provided with the Air Source Heat Pump pre-plumbed cylinder will ensure the safe operation of the unit within
a central heating system.

Connection to the various system components is made via the FTC5 Controller tted to the front of the Pre-plumbed cylinder,
refer to the Manual supplied for the FTC5 Controller and the terminal identication labels within the FTC5 Controller to aid

in connecting the various external system components such as the mains supply, programmer and heat pump. The wiring

to the external components is made using exible cable, this should be secured using the integral cable grips located in the

FTC5 Controller.

Provision is made for the connection of a second CH zone (connections supplied blanked off). Additional controls will be

necessary to control the operation of the second CH zone. Connection terminals are provided and identied in the FTC5

Controller to enable any wiring to be connected to the same central position.

Fig 9 - Optional 2 zone control pack - plumbing schematic

Fig 10 - 2 zone control pack - component wiring

24

Primary Flow

Secondary Z1 Flow

Secondary Z2 Flow

Secondary Z2 Return

Primary Return

Secondary Z1 Return

TB1.2 3-4 (THW6)

TB1.2 5-6 (THW7)

TB1.2 7-8 (THW8)

TB1.2 9-10 (THW9)

SW2-7 - ON

SW3-6 - ON

Fig 11 - 2 zone control pack - temperature sensor wiring

Fig 12 - 2 zone control pack - dip switch settings

25

Fig 13 - Optional 2 zone twin temperature control pack - plumbing schematic

Secondary Z1 Flow

Secondary Z2 Flow

Secondary Z2 Return

Secondary Z1 Return

TBO.1 3-4 (OUT2)

TBO.1 5-6 (OUT3)

Mixing Valve

TBO.2 1-2-3 (OUT5)

Fig 14 - Optional 2 zone twin temperature control pack - component wiring

26

Secondary Z1 Flow

Secondary Z2 Flow

Secondary Z2 Return

Secondary Z1 Return

Mixing Valve

TB1.2 3-4 (THW6)

TB1.2 5-6 (THW7)

TB1.2 7-8 (THW8)

TB1.2 9-10 (THW9)

SW2-7 - ON

Fig 15 - Optional 2 zone twin temperature control pack - sensor wiring

Fig 16 - Optional 2 zone twin temperature control pack - dip switch settings

27

Fig 17 - Wiring of Motorised Mixing valve Fig 18 - Schematic of Motorised Mixing Valve hydraulic connections

Fig 19 - Factory made conections to FTC5
controller PCB

BLUE

BROWN

TO RIGHT HAND
PRIMARY PUMP

BLUE

BROWN

TO LEFT HAND
PRIMARY PUMP
(CABLE WITH
WHITE ID TAG)

TO FLOW SENSOR
ASSEMBLY.
CONNECTION TO
PCB VIA WHITE
JST CONNECTOR TO
CN1A

TO TANK SENSOR

(SENSOR TO BE
INSERTED IN SPARE
POCKET ON
ELEMENT PLATE)

TO DHW

CIRCULATING PUMP

DHW PUMP

CONNECTION TO
PCB BY MEANS OF
RED JST PLUG
CONNECTOR TO
SOCKET CNP4

TO FLOW SENSOR

(SENSOR TO BE
INSERTED IN
POCKET ON FLOW
PIPE) GREY
SLEEVING

TO RETURN SENSOR
(SENSOR TO BE
INSERTED IN
POCKET ON
RETURN PIPE)
BLACK SLEEVING

FLOW AND RETURN
SENSORS
CONNECTION TO
PCB BY MEANS OF
RED JST PLUG
CONNECTOR TO
CNW12

SOCKET CNW5

ALL EARTH CONDUCTOR CONNECTIONS
TO BE MADE TO EARTHING SCREWS ON
FTC-5 CONTROLLER REAR CHASSIS

TO 3 WAY VALVE
ACTUATOR HEAD.
CONNECTION TO
PCB VIA CNV1

TANK SENSOR
CONNECTION TO
PCB BY MEANS OF
WHITE JST PLUG
CONNECTOR TO

TO RIGHT HAND
PRIMARY PUMP
PWM CONTROL
CABLE

28

29

30

How to use TB0 1 to 5

31

INSTALLATION - SOLAR PRIMARY

CONNECTION TO THE SOLAR PRIMARY CIRCUIT
The lower coil of the Solar models must be connected to a fully pumped solar primary circuit. The connections are suitable

for a 22mm copper pipe direct to compression ttings provided. The connections are also threaded 3/4” BSP male parallel

should BSP connections be required.

The solar primary circuit must have its own dedicated circulating pump, thermal and safety controls which must be installed

as per the manufacturer’s instructions.

CONTROL OF SOLAR PRIMARY CIRCUIT
Temperature control of the Solar models when heated by a solar thermal system must be carried out using a suitable pro­prietary solar differential temperature controller. The cylinder temperature sensing probe (usually supplied with the solar
differential temperature controller) should be inserted into the pocket provided on the cylinder and its cable secured using
the cable clamp supplied.

The solar controller and solar primary circulation pump must be wired via the over-temperature cut-out mounted in the lower
solar controls housing (see Fig 20). This will ensure that the heat input to the solar coil is interrupted in the event of the

cylinder over-heating. There must also be suitable Check (non-return) valves installed in the solar primary ow and return to

prevent the possibility of any thermo-syphoning if the solar circulation is stopped.

Connection to the solar differential temperature controller should be in accordance with the manufacturer’s instructions. The

controller should be set to give a recommended cylinder temperature of approx. 60°C otherwise nuisance operation of the
thermal cut-outs may occur.

SOLAR
THERMAL
CUT-OUT

SOLAR CUT-OUT
(LOWER) TERMINAL
HOUSING

L
N

SOLAR
CONTROLLER

POWER SUPPLY TO
SOLAR CONTROLLER

Fig 20 - Solar thermal cut-out wiring

32

INSTALLATION - IMMERSION HEATER ELECTRICAL SUPPLY

The pre-plumbed cylinder units are supplied tted with an immersion heater which can be used to supplement the Air Source

Heat Pump heating input. The immersion heater is located within the controls housing. Refer to Fig 21 below for details of wiring
of the immersion heater. The mains supply circuit to the immersion heater must be protected by a suitable fuse and

double pole isolating switch with a contact separation of at least 3mm in both poles. THE IMMERSION HEATER MUST
BE EARTHED.The supply cable for the immersion heater must be aminimum of 1.5mm2 3 core HO5 VV-F sheathed.

DO NOT BYPASS THE THERMAL CUT-OUT IN ANY CIRCUMSTANCES

A

B

EARTH
CONNECTION

2/T1 4/T2 6/T3 A2

1/L1 3/L2 5/L3 A1

IHC

1

2 4

3

ECB

RED

BLUE

ORANGE

ORANGE

BLUEBROWN GREEN / YELLOW

THERMAL
CUT-OUT

IMMERSION
HEATER TERMINAL
HOUSING

GREEN / YELLOW

BLUE

BROWN

FTC5 CONTROLLER

IMMERSION HEATER
MAINS SUPPLY CABLE

1.5mm

2

3 CORE

HO5 VV-F CABLE

TO PLUG REFERENCE
CNIH ORN ON FTC-5
PCB

EARTH SCREW ON FTC-5
CONTROLLER BACKPLATE

Fig 21 - Immersion heater wiring

33

COMMISSIONING

At the time of commissioning, please ensure a Commissioning Checklist is completed for the installation.

FILLING THE UNIT WITH WATER

• BEFORE FILLING CHECK AND TIGHTEN ALL MECHANICAL JOINTS AND CONNECTIONS IN CASE THESE HAVE

LOOSENED DURING TRANSIT.

• Check expansion vessel pre-charge pressure. The vessel is supplied precharged to 3.5 bar to match the control pressure

of the pressure reducing valve. The precharge pressure is checked using a car tyre gauge by unscrewing the plastic
cap opposite the water connection.

• Check all connections for tightness including the immersion heater(s). An immersion heater key spanner is supplied for

this purpose.

• Ensure the drain cock is CLOSED.

• Open a hot tap furthest from the cylinder.

• Open the cylinder isolating valve to ll the unit. When water ows from the tap, allow to run for a few minutes to thoroughly

ush through any residue, dirt or swarf, then close the tap.

• Open successive hot taps to purge the system of air.

SYSTEM CHECKS

• Check all water connections for leaks and rectify as necessary.

• Turn off water supply to the cylinder.

• Remove the pressure reducing valve head work to access the strainer mesh, clean and re-t.

• Manually open, for a few seconds, each relief valve in turn, checking that water is discharged and runs freely through

the tundish and out at the discharge point.

• Ensure that the valve(s) reseat satisfactorily.

DOMESTIC HOT WATER (DHW) CIRCULATION

Ensure the DHW circulation pump is set to speed setting II to ensure optimum DHW heating performance. Failure to
do so can result in excessive use of the back-up immersion heater or lower storage temperatures than required.

PRIMARY CIRCUIT

Fill the primary circuit following the Air Source Heat Pump commissioning instructions. Vent any trapped air. Check the primary
system for leaks and rectify as necessary. Flush the primary system in accordance with the instructions on Page 22 and add

a suitable inhibitor and anti-freeze solution when re-lling.

Switch on the electrical supply to the Air Source Heat Pump and immersion heater. Programme the Air Source Heat Pump

controller as detailed in the tting and user instructions supplied with the controller. Set the controller for hot water operation

only. After a short delay the primary pump on the return to the Heat Pump and the DHW pump should run and the Heat Pump

operate. The temperature of the primary ow to the cylinder should increase, if it does not, check for a wiring or piping error.

Allow the unit to heat up.

Select the heating only function on the controller. Both primary pumps should run and the Heat Pump operates. The primary

ow to the cylinder primary pipework manifold and the radiator circuit should become hot, if it does not check for a wiring or

piping error.

The minimum hot water setting is 40 °C. The maximum hot water setting is 60 °C. In hard water areas a maximum of 60 oC
is recommended.

When the heating and hot water temperatures are reached, the pumps should stop running and the Heat Pump stop operating.

Check that no water is discharged from either the expansion valve or temperature and pressure relief valve during the

heating cycle. If the user temperatures or “On” and “Off” times have been adjusted for commissioning purposes, the controller

should be reset to the desired settings. The operation of the controller should be demonstrated to the user and the controller
installation and user instructions left with them for future reference.

AUTOMATIC SYSTEM BY-PASS

An automatic differential bypass valve should be installed between the primary ow and the primary return to the main space
heating zone from the Low Loss Header such that a minimum ow rate can be maintained through the Heat Pump in the
event of the heating circuit being satised. See instructions supplied with the valve for setting details for the valve.

34

MAINTENANCE

MAINTENANCE REQUIREMENTS

Unvented hot water systems have a continuing maintenance requirement in order to ensure safe working and optimum
performance. It is essential that the relief valve(s) are periodically inspected and manually opened to ensure no blockage
has occurred in the valves or discharge pipework. Similarly cleaning of the strainer element and replacement of the air in the
expansion vessel will help to prevent possible operational faults.

The maintenance checks described below should be performed by a competent person on a regular basis, e.g. annually to
coincide with Heat Pump maintenance.

After any maintenance, please complete the relevant service interval record documentation for the installation.

INSPECTION

The immersion heater boss can be used as an access for inspecting the cylinder internally.

SAFETY VALVE OPERATION

Manually operate the temperature/pressure relief valve for a few seconds. Check water is discharged and that it ows freely

through the tundish and discharge pipework. Check valve reseats correctly when released. NOTE: Water discharged may
be very hot!

Repeat the above procedure for the expansion relief valve.

STRAINER

Turn off the cold water supply, Heat Pump and immersion heater. The lowest hot water tap should then be opened to depressurise
the system. Remove the pressure reducing cartridge to access the strainer mesh. Wash any particulate matter from the

strainer under clean water. Re-assemble ensuring the seal is correctly tted. DO NOT use any other type of sealant.

DESCALING IMMERSION HEATER(S)

Before removing the immersion heater, the unit must be drained. Ensure the water, electrical supply and Heat Pump are OFF

before draining. Attach a hosepipe to the drain cock having sufcient length to take water to a suitable discharge point below

the level of the unit. Open a hot tap close to the unit and open the drain cock to drain the unit.

IMMERSION HEATER REMOVAL

Open the cover to the immersion heater housing and disconnect wiring from immersion heater over-temperature cut-out.
Remove the over-temperature cutout by pulling from the terminal connections on the immersion heater. Unscrew immersion

heater backnut and remove immersion heater from the unit. A key spanner is supplied with the cylinder unit for easy removal/

tightening of the backnut(s). Over time, the immersion heater gasket may become stuck to the mating surface. To break
the seal, insert a round bladed screwdriver into one of the pockets on the immersion heater and gently lever up and down.

Carefully remove any scale from the surface of the element. DO NOT use a sharp implement as damage to the element

surface could be caused. Ensure sealing surfaces are clean and seals are undamaged, if in doubt t a new gasket.

Replace immersion heater ensuring the (right angled) element hangs vertically downwards towards the base of the unit. It
may be helpful to support the immersion heater using a round bladed screwdriver inserted into one of the thermal control
pockets whilst the backnut is tightened. Replace over-temperature cutout rod into pocket. Replace the immersion heater
over-temperature cutout by carefully plugging the two male spade terminations on the underside of the thermostat head into
the corresponding terminations on the element. Rewire, check, close and secure immersion heater housing cover.

EXPANSION VESSEL CHARGE PRESSURE

Remove the dust cap on top of the vessel. Check the charge pressure using a tyre pressure gauge. The pressure (with system

de-pressurised) should be 0.35MPa (3.5 bar). If it is lower than the required setting it should be re-charged using a tyre pump
(Schrader valve type). DO NOT OVER-CHARGE. Re-check the pressure and when correct replace the dust cap.

RE-COMMISSIONING

Check all electrical and plumbing connections are secure. Close the drain cock. With a hot tap open, turn on the cold water

supply and allow unit to rell. DO NOT switch on the immersion heater or Heat Pump until the unit is full. When water ows
from the hot tap, allow to ow for a short while to purge air and ush through any disturbed particles. Close hot tap and then

open successive hot taps in the system to purge any air. When completely full and purged, check system for leaks. The
heating source (immersion heater and Heat Pump) can then be switched on.

35

CLEANING THE FERNOX TF-1 COMPACT MAGNETIC FILTER

Note: There is no need to remove the cap of the TF-1 lter for cleaning

Close the isolating valves either side of the TF-1 magnetic lter. Remove the magnetic core by pulling upwards. Wait 30 seconds
for any collected particles to settle in the lter body. Open the lower isolating valve then open the drain valve, collect any uid

and debris in a suitable container. Close the drain valve and open the upper isolating valve. Vent any trapped air from the

lter by opening the air bleed screw on the cap. If necessary, re-pressurise the system using the lling loop tted to the unit.

Should the cap need to be removed a spanner is provided in the accessory kit for this purpose. When replacing the cap a

new ‘o’ ring should be used, this is also provided in the kit. Air can be vented by opening the bleed screw in the centre of the
air vent valve, the complete valve does not need to be removed. Should the valve be removed a replacement ‘o’ ring should

be used (provided in accessory kit) when re-assembling.

SERVICE LOG BOOK

On completion of any maintenance or service of the pre-plumbed cylinder, the Service Log Book should be lled in to record

the actions taken and the date the work was undertaken.

ISOLATING VALVES
( 2 OFF )

INLET / OUTLET PORT

ISOLATING VALVE
SEALING WASHERS
( 2 OFF )

FILTER BODY

DRAIN VALVE (DO NOT
REMOVE)

CAP AND KEY

FILTER BODY CAP

MAGNET

AIR VENT

CAUTION: CONTAINS STRONG MAGNETIC FIELDS
IF YOU HAVE AN IMPLANTED CARDIAC DEVICE EXTRA
CAUTION SHOULD BE TAKEN WHEN HANDLING THE
TF-1 COMPACT FILTER AND MAGNETIC CORE

Fig 22 - Fernox TF-1 Compact Magnetic Filter assembly

36

FAULT FINDING & SERVICING

IMPORTANT

• After servicing, complete the relevant Service Interval Record for the installation.

• Servicing should only be carried out by competent persons in the installation and maintenance of unvented water heating
systems.

• Any spare parts used MUST be authorised Mitsubishi Electric parts.

• Disconnect the electrical supply before removing any electrical equipment covers.

• NEVER bypass any thermal controls or operate system without the necessary safety valves.

• Water contained in the Air Source Heat Pump pre-plumbed cylinder may be very hot, especially following a thermal control
failure. Caution must be taken when drawing water from the unit.

SPARE PARTS

A full range of spare parts are available for the Mitsubishi Air Source Heat Pump pre-plumbed cylinder range (see Table 8,
page 37). Refer to the technical data label on the unit to identify the model installed and ensure the correct part is ordered.
You will need to quote the serial number which is printed on the data label.

FAULT FINDING

The fault nding chart (above) will enable operational faults to be identied and their possible causes rectied. Any work carried

out on this unvented water heater and its associated controls MUST be carried out by a competent installer for unvented
water heating systems. In case of doubt contact Service Support (see contact details on back page).

WARNING
DO NOT TAMPER WITH ANY OF THE SAFETY VALVES OR CONTROLS SUPPLIED WITH THE PRE-PLUMBED CYLINDER
AS THIS WILL INVALIDATE ANY GUARANTEE.

Table 7 - Fault Finding Table

FAULT POSSIBLE CAUSE REMEDY

No hot water ow

1. Mains supply off. 2. Check and open stock cock.

2. Strainer blocked. 2. Turn off water supply. Remove strainer and clean (see
maintanance section).

3. Cold water combination valve incorrectly tted. 3. Check and ret as required.

Water from hot taps
is cold

1. BACK UP immersion heater not switched on. 1. Check and switch on.

2. BACK UP immersion heater thermal cut-out

has operated.

2. Check. Reset by pushing button.

3. Programmer set to Central Heating only. 3. Check. Set to Domestic Hot Water programme.

4. Air Source Heat Pump not working. 4. Check heat pump operation. If fault is suspected, consult
heat pump instructions.

5. Thermal cut-out has operated. 5. Check. Reset by pushing button on cut-out. Check
operation of DHW thermal sensor

6. DHW circulating pump not connected

correctly.

6. Check wiring and/or plumbing connections to DHW
circulating pump. Check isolating valves are open

Water discharges from
Expansion Valve

1. INTERMITTENTLY

Expansion vessel charge pressure has reduced
below 3.5bar.

1. See Maintance section for re-charging procedure.

2. CONTINUALLY

a. Cold water combination valve pressure
reducer not working correctly.
b. Expansion valve seat damaged.

2a. Check pressure from cold water combination valve. If
greater than 3.6 bar, replace pressure reducer cartridge.
2b. Remove expansion valve cartridge. Check condition of
seat. If necessary, t new expansion valve cartridge.

Water discharges from
T&P Relief Valve

1. Thermal control failure. NOTE water will be

very hot.

1. Switch off power to immersion heater(s) and /or shut down
Heat Pump. DO NOT turn off water supply. When discharge
stops check all thermal controls, replace if faulty.

Milky water

1. Oxygenated water. 1. Water from a pressurised system releases oxygen
bubbles when owing. The milkiness will disappear after
a short while.

37

Table 8 - Spares list

DESCRIPTION PART NO.

1 Immersion heater (including terminal shroud and gasket) 95602002

2 Immersion heater gasket 95611026

3 Immersion heater backnut 95605204

4 Immersion heater key spanner 95605205

5 Tundish 95607881

6 Expansion Valve Cartridge 8 bar 95605206

7 Expansion Valve 8 bar Complete 95605207

8 Temperature / pressure relief valve 95605209

9 DHW Expansion vessel 12 litre ( 150 litre models) 95970022

10 DHW Expansion vessel 18 litre ( 170 and 210 litre models) 95970023

11 DHW Expansion vessel 24 litre (250 and 300 litre models) 95970024

12 Pressure Reducing Valve (3.5 bar) 95605211

13 Nut and olive pack (4 of each) 95970026

14 TSRU immersion heater over-temperature cutout 95602003

16 Primary circulating pump - UPM3 7696407

17 Primary circulating pump 150 - 210L models - UPM GEO 7696408

18 Primary circulating pump 250 & 300L models - UMPXL GEO 7696409

19 DHW circulating pump 54HSHDHW

20 Filling loop 95970029

21 Automatic air vent 95970032

22 Primary system pressure gauge 95970033

23 Drain valve 95605210

24 Terminal shroud 95970034

25 Flow sensor Body 307286

26 Flow sensor cable 307287

27 O rings for Flow Sensor body (2 per) 307288

28 Fastner clip for Flow sensor body (2 per) 307289

29 Plate to plate heat exchanger 54HSHPHEX

30 Plate to plate heat exchanger insulation set 95970037

31 Terminal box cover (Standard and Solar models) 95970038

32 Terminal box cover (Slimline models) 95970039

33 Fernox TF1 magnetic lter 95970061

34 Primary pump isolating valve 95605212

35 DHW pump isolating valve 95605213

36 Scale trap assembly 95970062

37 3 way motorised diverter valve - Actuator head 54HSH3WV-ACT

38 3 way motorised diverter valve - Valve body 54HSH3WV-VLV

39 Flow temperture sensor assembly PAC-TH011-E

40 Return temperature sensor assembly PAC-TH011-E

41 DHW tank thermal sensor assembly PAC-TH011TK-E

42 Solar sensor pocket assembly including gasket (Solar models only) 95970025

43 Solar thermal over-temperature cutout (Solar models only) 95970060

38

Fig 23 - Spares Diagram

Fig 24 - Pressure Reducing valve 3.5 bar Fig 25 - Element spares

Cold Mains

Connection (22mm)

Outlet Connection
(22mm)

32

14

3

1

2

31

24

22

21

38

18

23

31 32

29

19

5

8

6

7

33

37

34

35

36

30

24

H

16

17

25

26

27

39

USER INSTRUCTIONS

WARNINGS

IF WATER ISSUES FROM THE TEMPERATURE/PRESSURE RELIEF VALVE ON THE PRE-PLUMBED CYLINDER,
SHUT DOWN THE HEAT PUMP AND IMMERSION HEATER. DO NOT TURN OFF ANY WATER SUPPLY. CONTACT A
COMPETENT INSTALLER FOR UNVENTED WATER HEATERS TO CHECK THE SYSTEM.

DO NOT TAMPER WITH ANY OF THE SAFETY VALVES FITTED TO THE PRE-PLUMBED CYLINDER. IF A FAULT IS
SUSPECTED, CONTACT A COMPETENT INSTALLER.

COMMISSIONING RECORD

Please ensure that the installer has fully completed a Commissioning Checklist and Record for the installation and that you
have signed it to say that you have received a full and clear explanation of its operation. The installer is legally required to
complete a commissioning checklist as a means of complying with the appropriate Building Regulations (England and Wales).

All installations must be notied to Local Area Building Control either directly or through a Competent Persons Scheme. A
Building Regulations Compliance Certicate will then be issued to the customer who should, on receipt, write the Notication

Number on the Commissioning Checklist.

This product should be serviced regularly to optimise its safety, efciency and performance. The service engineer should

complete the relevant Service Record document after each service.

TEMPERATURE CONTROLS IMMERSION HEATER

The hot water storage temperature is set on the Programmer, the water temperature is sensed by means of a thermistor sensor
located in a pocket on the immersion heater assembly. This should be set to give a water storage temperature of approx. 55°

to 60°C. The immersion heater assembly is also tted with an over-temperature cut-out. Access to the temperature sensor

and over-temperature cut-out can be made by opening the immersion heater cover - DISCONNECT THE ELECTRICAL
SUPPLY BEFORE OPENING THE COVER.

DO NOT bypass the thermal cut-out(s) in any circumstances.

HEATING BY HEAT PUMP

The space heating control temperature and the operating times for heating and hot water are set using the remotely mounted
controller. The optimum temperatures and times will have been set during commissioning. Should the temperatures or timings

need to be altered, refer to the installation and user instructions leaet supplied with the controller for the method of adjustment.

FLOW PERFORMANCE

When initially opening hot outlets a small surge in ow may be noticed as pressures stabilise. This is quite normal with

unvented systems. In some areas cloudiness may be noticed in the hot water. This is due to aeration of the water is quite
normal and will quickly clear.

OPERATIONAL FAULTS

Operational faults and their possible causes are detailed in the Fault Finding section (page 36) of this manual. It is recommended
that faults should be checked by a competent installer.

The air volume within the expansion vessel will periodically require recharging to ensure expanded water is accommodated
within the unit. A discharge of water INTERMITTENTLY from the expansion valve will indicate the air volume has reduced to
a point where it can no longer accommodate the expansion.

40

36006282_issue_06

Telephone: [phone]

After Sales Service: 0161 866 6089
Email: [e-mail]
Web: heating.mitsubishielectric.co.uk

UNITED KINGDOM
Mitsubishi Electric Europe
Living Environmental Systems Division
Travellers Lane

Hateld

Hertfordshire
AL10 8XB

General Enquiries
Telephone: [phone] Fax: [phone]

IRELAND
Mitsubishi Electric Europe
Westgate Business Park
Ballymount
Dublin 24
Ireland

Telephone: Dublin [phone] Fax: Dublin [phone] International code: 00 3531

ENVIRONMENTAL INFORMATION

Products are manufactured from many recyclable materials. At the end of their useful life they should be disposed of at a

Local Authority Recycling Centre in order to realise the full environmental benets.

Insulation is by means of an approved CFC/HCFC free polyurethane foam with an ozone depletion factor of zero.

WEEE Declaration

Disposal of Waste Equipment by Users in Private Household in the European Union.

This symbol on the product indicates that this product must not be disposed of with your other household waste.
Instead, it is your responsibility to dispose of your waste equipment by handing it over to a designated collection point for
the recycling of waste electrical equipment. The separate collection and recycling of your waste equipment at the time
of disposal will help to conserve natural resources and ensure that it is recycled in a manner that protects human health
and the environment. For more information about where you can drop off your waste equipment for recycling, please

contact your local city ofce, your household waste disposal service or the company where this product was purchased.