Mitsubishi Electric EHWT17D-MHEDW User manual

INSTALLATION MANUAL
For safe and correct use, read this manual before installing the heat pump unit, which is installed indoors.
FOR INSTALLER
English
Water to Water Heat Pump
EHWT17D-MHEDW
RK79D203K01_01en.indd 1 2022/02/14 16:52:37
001

Accessories (Included)
Adjustable feet Immersion heater
boss tool SD memory card Copper liner for
DHW pipe Gasket O-ring Joint for install
PICV into Module
4 1 1 4 4 4* 1
*For 3-Way valve: O-ring Inner diameter 15.8 mm
For Heating return: O-ring Inner diameter 25.7 mm
For installing PICV into Module: O-ring Inner diameter
21.8 mm and 25.7 mm
1
en
Contents
1. Safety Notices........................................................... 2
2. Introduction............................................................... 8
3. Technical Information .............................................. 8
4. Installation............................................................... 15
4.1 Location .............................................................. 15
4.2 Water/Ambient Loop Quality
and System Preparation .................................... 18
4.3 Water Pipe Work ................................................. 19
4.4 Ambient Loop Pipe Work .................................. 21
4.5 Safety Device Discharge Arrangements (G3) ... 23
4.6 Electrical Connection......................................... 24
5. System Set Up ........................................................ 26
5.1 FTC ...................................................................... 26
5.2 C.B. ...................................................................... 45
6. Commissioning....................................................... 46
7. Service and Maintenance....................................... 47
8. Supplementary information................................... 55
Abbreviations and glossary
No. Abbreviations/Word Description
1 Compensation curve
mode
Space heating incorporating outdoor ambient temperature compensation
2 COP Coefcient of Performance the efciency of the heat pump
3 Heat pump Abbreviations for Water/Brine source heat pump
Indoor unvented DHW tank and component plumbing parts
4 DHW mode Domestic hot water heating mode for showers, sinks, etc
5 Flow temperature Temperature at which water is delivered to the primary circuit
6 Freeze stat. function Heating control routine to prevent water pipes freezing
7 FTC Flow temperature controller, the circuit board in charge of controlling the water circuit
8 C.B. Controller board, the circuit board in charge of controlling the refrigerant and ambient loop
9 Heating mode Space heating through radiators or Underoor heating
10 Legionella Bacteria potentially found in plumbing, showers and water tanks that may cause Legionnaires disease
11 LP mode
Legionella prevention mode – a function on systems with water tanks to prevent the growth of legionella bacteria
12 PRV Pressure relief valve
13 Return temperature Temperature at which water is delivered from the primary circuit
14 TRV
Thermostatic radiator valve – a valve on the entrance or exit of the radiator panel to control the heat output
15 Brine Mixture of antifreeze and water
16 Module Casing with built-in refrigerant circuit
17 Ambient loop Piping between WTW and Local system 2
Filled with brine or water
18 Ambient temp./
Ambient temperature
Outdoor temperature
19 PICV Pressure Independent Control Valve
For safe and correct use, read this manual before installing the heat pump unit.
RK79D203K01_01en.indd 1 2022/02/14 16:52:37
002

Safety Notices
1
2
en
Please read the following safety precautions carefully.
WARNING:
Precautions that must be observed
to prevent injuries or death.
CAUTION:
Precautions that must be ob-
served to prevent damage to unit.
This installation manual along with the user manual should be left
with the product after installation for future reference.
Mitsubishi Electric is not responsible for the failure of locally-supplied
parts.
• Be sure to perform periodical maintenance.
• Be sure to follow your local regulations.
• Be sure to follow the instructions provided in this manual.
MEANINGS OF SYMBOLS DISPLAYED ON THE UNIT
WARNING
(Risk of re)
This unit uses a ammable refrigerant.
If refrigerant leaks and comes in contact with re or
heating part, it will create harmful gas and there is risk
of re.
Read the OPERATION MANUAL carefully before operation.
Service personnel are required to carefully read the OPERATION
MANUAL and INSTALLATION MANUAL before operation.
Further information is available in the OPERATION MANUAL, IN-
STALLATION MANUAL, and the likes.
RK79D203K01_01en.indd 2 2022/02/14 16:52:37
003

Safety Notices
1
3
en
WARNING
Mechanical
The heat pump unit must not be installed, disassembled, relocated, al-
tered or repaired by the user. Ask an authorised installer or technician. If
the unit is installed improperly or modied after installation, water leak-
age, electric shock or re may result.
The heat pump unit should be positioned on a hard level surface capable
of supporting its lled weight to prevent excessive sound or vibration.
Do not position furniture or electrical appliances below the unit.
The discharge pipework from the emergency devices of the heat pump
unit should be installed according to local law.
All such safety relief valve connections shall NOT be used for any other
purpose.
Only use accessories and replacement parts authorised by Mitsubishi
Electric ask a qualied technician to t the parts.
Electrical
All electrical work should be performed by a qualied technician accord-
ing to local regulations and the instructions given in this manual.
The units must be powered by a dedicated power supply and the correct
voltage and circuit breakers must be used.
Wiring should be in accordance with national wiring regulations. Connec-
tions must be made securely and without tension on the terminals.
Earth unit correctly.
General
Do not smoke during work and transportation.
Keep children and pets away from the heat pump unit.
Do not use the hot water produced by the heat pump directly for drinking
or cooking. This could cause illness to the user.
Do not stand on the units.
Do not touch switches with wet hands.
Annual maintenance checks on the heat pump unit should be conducted
by a qualied person.
Do not place containers with liquids on top of the heat pump unit. If they leak
or spill onto the heat pump unit damage to the unit and/or re could occur.
Do not place any heavy items on top of the heat pump unit.
RK79D203K01_01en.indd 3 2022/02/14 16:52:37
004

Safety Notices
1
4
en
WARNING
When installing, relocating, or servicing the heat pump unit, use tools and pipe
components specically made for use with R32 refrigerant and use only the
specied refrigerant (R32) to charge the refrigerant lines. Do not mix it with any
other refrigerant and do not allow air to remain in the lines.
If air is mixed with the refrigerant, then it can be the cause of abnormal high pres-
sure in the refrigerant line, and may result in an explosion and other hazards.
The use of any refrigerant other than that specied for the system will cause me-
chanical failure or system malfunction or unit breakdown. In the worst case, this
could lead to a serious impediment to securing product safety.
In heating mode, to avoid the heat emitters being damaged by excessive-
ly hot water, set the target ow temperature to a minimum of 2ºC below
the maximum allowable temperature of all the heat emitters. For Zone2,
set the target ow temperature to a minimum of 5ºC below the maximum
allowable ow temperature of all the heat emitters in Zone2 circuit.
Do not install the unit where combustible gases may leak, be produced,
ow, or accumulate. If combustible gas accumulates around the unit, re
or explosion may result.
Do not use means to clean, other than those recommended by the man-
ufacturer.
The appliance shall be stored in a room without continuously operating igni-
tion sources (for example: open ames, an operating gas appliance or an
operating electric heater).
Do not pierce or burn.
Be aware that refrigerants may not contain an odour.
Pipe-work shall be protected from physical damage.
The installation of pipe-work shall be kept to a minimum.
Compliance with national gas regulations shall be observed.
The appliance shall be stored in a well-ventilated area where the room
size corresponds to the room area as specied for operation.
Keep gas-burning appliances, electric heaters, and other re sources (ig-
nition sources) away from the location where installation, repair, and oth-
er air conditioner work will be performed. If refrigerant comes into contact
with a ame, poisonous gases will be released.
RK79D203K01_01en.indd 4 2022/02/14 16:52:37
005

Safety Notices
1
5
en
WARNING
Brine
The selection of the brine MUST be in accordance with the applicable leg-
islation.
Take sufcient precautions in case of brine leakage. If brine leaks, venti-
late the area immediately and contact your local dealer.
The ambient temperature inside the unit can get much higher than that of the
room, e.g. 70°C. In case of a brine leak, hot parts inside the unit can create
a hazardous situation.
The use and installation of the application MUST comply with the safety
and environmental precautions specied in the applicable legislation.
RK79D203K01_01en.indd 5 2022/02/14 16:52:37
006

Safety Notices
1
6
en
CAUTION
Use clean water that meets local quality standards on the primary circuit
and ambient loop (When not using Brine).
The heat pump unit should be located indoors to minimise heat loss.
Remove as much air as possible from the primary and DHW circuits
Refrigerant leakage may cause suffocation. Provide ventilation in accord-
ance with EN378-1.
Be sure to securely t insulation around the piping. Direct contact with the
bare piping may result in burns or frostbite.
Never put batteries in your mouth for any reason to avoid accidental in-
gestion.
Battery ingestion may cause choking and/or poisoning.
Install the unit on a rigid structure to prevent excessive sound or vibration
during operation.
Do not transport the heat pump unit with water inside the DHW tank. This
could cause damage to the unit.
If power to the heat pump unit is to be turned off (or system switched off)
for a long time, the water should be drained.
If unused for a long period, before operation is resumed, DHW tank
should be ushed through with potable water, and sterilised accordinaly.
Preventative measures should be taken against water hammer, such as
installing a Water Hammer Arrestor on the primary water circuit, as direct-
ed by the manufacturer.
Do not use refrigerant other than R32 refrigerant.
Servicing shall be performed only as recommended by the manufacturer.
Use the following tools specically designed for use with R32 refrigerant.
The following tools are necessary to use R32 refrigerant. Contact your
nearest dealer for any questions.
Be sure to install circuit breakers. If not installed, electric shock may re-
sult.
For the power lines, use standard cables of sufcient capacity. Otherwise,
a short circuit, overheating, or re may result.
When installing the power lines, do not apply tension to the cables. If the
connections are loosened, the cables can snap or break and overheating
or re may result.
Be sure to ground the unit. Do not connect the ground wire to gas or wa-
ter pipes, lightning rods, or telephone grounding lines. If the unit is not
properly grounded, electric shock may result.
RK79D203K01_01en.indd 6 2022/02/14 16:52:37
007

Safety Notices
1
7
en
CAUTION
Use circuit breakers (ground fault interrupter, isolating switch (+B fuse),
and molded case circuit breaker) with the specied capacity. If the circuit
breaker capacity is larger than the specied capacity, breakdown or re
may result.
Tools (for R32)
Gauge manifold Flare tool
Charge hose Size adjustment gauge
Gas leak detector Vacuum pump adapter
Torque wrench Electronic refrigerant charging scale
RK79D203K01_01en.indd 7 2022/02/14 16:52:37
008

Introduction
2
8
en
Product specication
Model name EHWT17D-MHEDW
Nominal domestic hot water volume 170 L
Overall unit dimensions 1750 × 595 × 680 mm (Height × Width × Depth)
Weight (empty) 166 kg
Weight (full) 345 kg
Refrigerant R32
The amount of refrigerant 0.9 kg
Water volume of heating circuit in the unit *1 5.47 L
Water volume of ambient loop in the unit 3.16 L
Safety device
Water circuit
(Primary)
Control thermistor Heating 1 to 80°C
Pressure relief valve 0.3 MPa (3 bar)
Flow sensor Min. ow 5.0 L/min
DHW tank Control thermistor 40 to 70°C
Temperature/Pressure relief valve 90°C / 0.7 MPa (7 bar)
Immersion
heater Manual reset 85°C
Ambient loop Control thermistor −8 to 30°C
Flow switch Min. ow 5.5 L/min
Refrigerant
circuit
Control thermistor (High) −20 to 125°C
Control thermistor (Low) −40 to 90°C
Pressure switch 4.14 ± 0.1 MPa
Pressure sensor 0 to 5.0 MPa
Primary circuit circulating Pump DC motor
Sanitary circuit circulating Pump AC motor
Connections Water (Primary/DHW circuits) 28 mm compression primary circuit/
22 mm compression DHW circuit
Water (Ambient loop) 22 mm compression
Guaranteed
operating range
Ambient *2 0 to 35°C ( 80 %RH)
Water inlet temperature (Ambient loop) 10 to 30°C
Min. Water outlet temperature (Ambient loop) 4°C
Operating range
Heating Room temperature 10 to 30°C
Flow temperature 20 to 60°C
DHW 40 to 60°C
Legionella prevention 60 to 70°C
Flow rate range
Primary circuit Max. 27.7 L/min
Min. 7.1 L/min
Ambient loop Max. 24.0 L/min
Min. 7.2 L/min
DHW tank performance
Maximum allowable hot water temperature 70°C
Declared load prole L
Average climate
Water heating energy efciency class
A+
Time to reheat 70% of DHW tank to 65°C *4 19.3 min
Time to raise DHW tank temp. 15 to 65°C *4 22.8 min
Electrical data
Heat pump
Power supply
(Phase, voltage, frequency) ~/N 230 V 50 Hz
Breaker 16 A
Immersion heater *3
Power supply
(Phase, voltage, frequency) ~/N 230 V 50 Hz
Capacity 3 kW
Current 13 A
Breaker 16 A
Sound power level at W10W35 (EN12102) 38 dB(A)
<Table 3.1>
The purpose of this installation manual is to instruct competent persons how to safely and efciently install and commission the heat
pump unit system. The target readers of this manual are competent heating, plumbing and/or refrigeration engineers who have at-
tended and passed the requisite Mitsubishi Electric product training and have appropriate qualications for installation of an unvented
hot water heat pump unit specic to their country.
Technical Information
3
Optional extras
• Wireless Remote Controller PAR-WT50R-E
• Wireless Receiver PAR-WR51R-E
• Remote Sensor PAC-SE41TS-E
• Thermistor PAC-TH011-E
• High temperature thermistor PAC-TH012HT-E
• ecodan Wi-Fi Interface MAC-567IF-E1
• 2-zone kit PAC-TZ02-E
• Expansion vessel (12L) PAC-EVP12-E
*1 Volume of sanitary water circuit is not included in this value
*2 The environment must be frost-free.
*3 Do not t immersion heaters without thermal cut-out. Use
only Mitsubishi Electric service parts as a direct replace-
ment.
*4 Tested under BS7206 conditions.
RK79D203K01_01en.indd 8 2022/02/14 16:52:38
009

Technical Information
3
9
en
Note: For parts not shown on this page, please refer to 'Circuit
diagram <Figure 3.2>'.
Component Parts
<Figure 3.1>
No. Part name
A DHW outlet pipe
B Cold water inlet pipe
C Water pipe (Space heating return connection (to heat pump))
DWater pipe (Space heating ow connection (from heat pump))
E
Water/Brine pipe (Ambient loop return connection (to heat pump))
F Water/Brine pipe (Ambient loop ow connection (from heat pump))
1 Control and electrical box
2 Main remote controller
3 Plate heat exchanger (Refrigerant - Primary circuit)
4 Low-pressure sensor
5 3-way valve
6 Manual air vent
7 Drain cock (Primary circuit)
8 Manometer
9 Pressure relief valve (3 bar) (Primary circuit)
10 Automatic air vent
11 Expansion vessel (Primary circuit) (Local supply)
12 Flow sensor
13 Strainer valve
14 Water circulation pump 1 (Primary circuit)
15 Pump valve
16 DHW tank
17
Plate heat exchanger (Primary circuit (water) - Sanitary circuit (water))
18 Scale trap
19 Water circulation pump (Sanitary circuit)
20 Immersion heater
21 Magnetic lter (Ambient loop) (Local supply)
22 Temperature and pressure relief valve
23 Drain cock (DHW tank)
24 Pressure relief valve (10 bar) (Ambient loop) (Local supply)
25 Flow water temp. thermistor (THW1)
26 Return water temp. thermistor (THW2)
27 DHW tank water temp. thermistor (THW5A)
28 DHW tank water temp. thermistor (THW5B)
29 Refrigerant liquid temp. thermistor (TH2)
30 Module
31 Drain pipe (Local supply)
32 Expansion vessel (Sanitary circuit (water)) *1
33 Isolating valve (Local supply)
34 Magnetic lter (Local supply) (Recommended)
35 PICV (Pressure Independent Control Valve) (Local supply)
36 Compressor
37 High-pressure sensor
38 Linear expansion valve
39 Charge plug
40 Liquid temp. thermistor (TH3)
41 Discharge temp. thermistor (TH4)
42 Ambient temp. thermistor (TH7)
43 Heat sink temp. thermistor (TH8)
44 Plate heat exchanger (Water/Brine - Refrigerant)
45 Drain cock (Ambient loop)
46 Inlet control group *1
47 Flow switch
48 Water inlet temperature (Ambient loop) thermistor (TH32)
49 Water outlet temperature (Ambient loop) thermistor (TH34)
50 Mufer
51 Drain cock (Sanitary circuit)
52 Filling loop (Ball valves, check valves and exible hose) *1
53 High-pressure switch
54 Compressor surface temperature (TH33)
*1 Supplied with UK model ONLY.
Please refer to PAC-WK02UK-E Installation Manual for more
information on accessories.
<Module>
<Overall>
Note:
For installation, make sure to install a suitably sized pri-
mary-side expansion vessel. (See gure 3.2 and 4.3.2 for
further guidance)
<Table 3.2>
AB
9
8
10
1
18
19
22
20
16
6
14
D
7
4
3
15
5
12
13
C
EF
17
51
30
37 5053
38
36
44
47
45
39
23
RK79D203K01_01en.indd 9 2022/02/14 16:52:40
010

Technical Information
3
10
en
Letter Pipe description Connection size/type
A DHW outlet connection 22 mm/Compression
B Cold water inlet connection 22 mm/Compression
C Space heating return connection 28 mm/Compression
DSpace heating ow connection 28 mm/Compression
E Ambient loop return connection 22 mm/Compression
FAmbient loop ow connection 22 mm/Compression
G
Electrical cable inlets
1
2
3
4
5
For inlets 1and 2, run low-voltage wires including external input
wires and thermistor wires. For inlets 3, 4and 5, run high-voltage
wires including power cable, and external output wires.
*For a wireless receiver (option) cable and ecodan Wi-Fi interface (option)
cable, use inlet
1
.
<Table 3.3>
<Unit: mm>
Technical Drawings
HANDLE
HANDLE
HANDLE
FE
D
C
0
75
130
301.6
460.6
505.6
550.6
B
A
G
0
376.3
471.5
180
240
0 40.7 100.7 299.6 394.9 549.9
0
41.7 86.7
444.9 499.9
22083
680
<LEFT SIDE><BACK>
595
<FRONT> <RIGHT SIDE>
<TOP>
100 ± 20
125 ± 20
90 ± 20
531.2
1738.8 (UNIT HEIGHT)
1750 (WITH ADJUST BOLT)
1246.9 30
636.3
681.3
AMBIENT LOOP FLOW CONNECTION
AMBIENT LOOP RETURN CONNECTION
MANOMETER
MAIN
CONTROLLER
TERMINAL
BLOCK
TEMPERATURE
&PRESSURE
RELIEF VALVE
FRONT
PANEL
RK79D203K01_01en.indd 10 2022/02/14 16:52:41
011

Technical Information
3
11
en
36 50
41
39 53
43
34
33
33
23
20
28
9
27
11
31
10
8
16
19
Pa
18
1315
14
2612 7
25 5
37 39
29
3840
44
48
42
49
47
45
3
17
6
22
4
31
52
46 32
24
21 35
51
30
(b)
(a)
36
54
Local
system 2*
Ambient
Heat
sink
Cold water
Local
system 1*
Flexible hose
(Temporary connection)
Mains water supply
Drain
Drain
DHW
Model name EHWT17D-MHEDW
Maximum supply pressure to the pressure reducing valve 16 bar
Operating pressure (Sanitary side) 3.5 bar
Expansion vessel charge setting pressure (Sanitary side) 3.5 bar
Expansion valve setting pressure (Sanitary side) 6.0 bar
Immersion heater specication (Sanitary side) * 3000 W, 230 V
DHW tank capacity 170 L
Mass of the unit when full 345 kg
Maximum primary working pressure 2.5 bar
Maximum sanitary-side working pressure 5.5 bar
Maximum ambient loop working pressure 9.5 bar
• Refer to <Table 3.2> for the part names.
Circuit diagram
<Figure 3.2>
Note
• To enable draining of water circuit an isolating valve should be positioned on both the inlet and outlet pipework. No valve
should be tted between the expansion valve (part of item 46) and the heat pump unit (safety matter).
• For space heating (primary) circuit a suitable expansion vessel MUST be supplied and tted by installer. (See gure 4.3.2) Be
sure to install a magnetic lter (item 34) on the inlet pipework to the heat pump unit.
• Suitable drain pipework should be attached to the relief valves instructed to be connected to it in Figure 3.2 in accordance with
your country’s regulations.
• When using components made from different metals or connecting pipes made of different metals insulate the joints to prevent
any corrosive reaction taking place which may damage the pipework. Filling loop’s exible hose must be removed following the
lling procedure. This exible hose (Item 52) is included in PAC-WK02-E.
• Install the inlet control group (item 46) above the level of the T&P relief valve (item 22).
This will ensure DHW tank will not require drain down to service/maintain the inlet control group.
* Refer to the following section [Local system].
* EN60335/Type 3000W single phase
230V 50Hz, length 460 mm.
Use only Mitsubishi Electric service
parts as a direct replacement.
Water circuit
(Primary/Sanitary)
Refrigerant circuit
Ambient loop
RK79D203K01_01en.indd 11 2022/02/14 16:52:42
012

1-zone temperature control
2-zone temperature control 1-zone temperature control with boiler
2-zone temperature control with boiler
1-zone temperature control
(2-zone valve ON/OFF control)
14
1
10
15
16
13
12
2
3
4
5
1
11
13
3
45
7
10
1
69
8
2
11
1
3
4
5
2
1
10
1
3
45
7
9
8
6
2
Technical Information
3
12
en
Local system 1
Zone1
Zone2
Zone1
Zone1
Zone1
Zone1
Zone2
Zone2
1.
Zone1 heat emitters (e.g. radiator, fan coil unit) (local supply)
2. Mixing tank (local supply)
3. Zone1 ow water temp. thermistor (THW6)
4. Zone1 return water temp. thermistor (THW7)
5. Zone1 water circulation pump (local supply)
6. Motorized mixing valve (local supply)
7. Zone2 ow water temp. thermistor (THW8)
8. Zone2 return water temp. thermistor (THW9)
9. Zone2 water circulation pump (local supply)
Optional part :
PAC-TH011-E
Optional part :
PAC-TH011-E
10. Zone2 heat emitters (e.g. underoor heating) (local supply)
11.Boiler ow water temp. thermistor (THWB1)
12. Mixing tank thermistor (THW10)
13. Boiler (local supply)
14. Zone1 2-way valve (local supply)
15. Zone2 2-way valve (local supply)
16. Bypass valve (local supply)
Optional part :
PAC-TH012HT-E
Zone1
RK79D203K01_01en.indd 12 2022/02/14 16:52:42
013

1
5(a)
(b)
(a)
(b)
(a)
(b)
2
5
3
7
45(a)
(b)
(a)
(b)
(a)
(b)
3
5
6
1. Air to Water Heat Pump
2. Header
3. Buffer Tank
4. Central plate Heat source / Heat pump
5. Pump
6. Valve
7. Heat exchanger
Technical Information
3
13
en
Local system 2
RK79D203K01_01en.indd 13 2022/02/14 16:52:42
014

Technical Information
3
14
en
Energy monitor
End user can monitor accumulated*1 ‘Consumed electrical energy’ and ‘Delivered heat energy’ in each operation mode*2 on the main
remote controller.
*1 - Monthly and Year to date
*2 - DHW operation
- Space heating
Refer to “5.1.9 Main remote controller” for how to check the energy, and “5.1.1 DIP switch function” for the details on DIP-SW setting.
Either one of the following two method is used for monitoring.
Note: Method 1 should be used as a guide. If a certain accuracy is required, the 2nd method should be used.
1. Calculation internally
Electricity consumption is calculated internally based on the energy consumption of refrigerant and ambient loop, electric heater,
water pump(s) and other auxiliaries.
Delivered heat is calculated internally by multiplying delta T (Flow and Return temp.) and ow rate measured by the factory tted
sensors.
Set the electric heater capacity and water pump(s) input and specs of additional pump(s) supplied locally. (Refer to the menu tree
in “5.1.9 Main remote controller”)
Immersion
heater Pump 1*1 Pump 2 Pump 3
EHWT17D-MHEDW 3 kW ***(factory tted
pump)
When additional pumps supplied
locally are connected as Pump 2/3,
change setting according to specs of
the pumps.
<Table 3.4>
*1 "***" displayed in the energy monitor setting mode means the factory fitted pump is connected as Pump 1 so that the input is auto-
matically calculated.
When anti-freeze solution (propylene glycol) is used for primary water circuit, set the delivered energy adjustment if necessary.
For further detail of above, refer to “5.1.9 Main remote controller”.
2. Actual measurement by external meter (locally supplied)
FTC has external input terminals for 2 ‘Electric energy meters’ and a ‘Heat meter’.
If two ‘Electric energy meters’ are connected, the 2 recorded values will be combined at the FTC and shown on the main remote
controller.
(e.g. Meter 1 for H/P power line, Meter 2 for heater power line)
Refer to the [Signal inputs] section in “5.1.2 Connecting inputs/outputs” for more information on connectable electric energy meter
and heat meter.
RK79D203K01_01en.indd 14 2022/02/14 16:52:42
015

a
e b
d
Installation
4
15
en
4.1 Location
Transportation and Handling
<Figure 4.1.1>
The heat pump unit is delivered on a wooden pallet base with
cardboard protection.
<Figure 4.1.2>
Service access
Care should be taken when transporting the heat pump unit that
the casing is not damaged by impact. Do not remove the protec-
tive packaging until heat pump unit has reached its final location.
This will help protect the structure and control panel.
•
The heat pump unit can be transported ONLY vertically. The max-
imum allowable inclination is 45°.
Module MUST be separated if it can only be transported/
carried horizontally.*
<see How to remove the module>. (during installation)
• The heat pump unit should ALWAYS be moved by a minimum
of 2 people.
• When carrying the heat pump unit use the handles provided.
• Before using the handles, make sure they are securely at-
tached.
• Please remove fixing legs, wooden base and any other
packaging once the unit is in installation location.
* Module removal, carrying and reassembling are installer's re-
sponsibility.
Suitable Location
Before installation the heat pump unit should be stored in a
frost-free weatherproof location. Units must NOT be stacked.
• The heat pump unit should be installed indoors in a frost free
weather proof location.
• The heat pump unit should be positioned on a level surface
capable of supporting 'it’s FILLED weight. (Adjustable feet (ac-
cessory parts) can be used to ensure unit I level)
• When using the adjustable feet, ensure that the oor is strong
enough.
• Care should be taken that minimum distances around and
in front of the unit for service access are observed <Figure
4.1.2>.
• Secure the heat pump unit to prevent it being knocked over.
• Install the heat pump unit where it is not exposed to water/
excessive moisture.
Service access diagrams
Service access
Parameter Dimension (mm)
a300
b150
c
(distance behind unit not visible
in Figure 4.1.2)
10
d700**
e150*
<Table 4.1.1>
* An additional space is required, when ambient loop pipe con-
necting to the side.
** Including service space for Module removal.
Sufficient space MUST be left for the provision of discharge
pipework as detailed in National and Local Building Regulations.
Handles
Front
Legs
<Preparation before the installation and service>
● Prepare the proper tools.
● Prepare the proper protection.
● Allow parts to cool before attempting any maintenance.
● Provide adequate ventilation.
● After stopping the operation of the system, turn off the power-supply breaker and remove the power plug.
● Discharge the capacitor before commencing work involving the electric parts.
<Precautions during service>
● Do not perform work involving electric parts with wet hands.
● Do not pour water or liquid into the electric parts.
● Do not touch the refrigerant.
● Do not touch the hot or cold surfaces in the refrigerant cycle.
● When the repair or the inspection of the circuit needs to be carried out without turning off the power, exercise great caution NOT to
touch any LIVE parts.
The heat pump unit must be located indoors and in a frost-
free environment, for example in a utility room, to minimise
heat loss from stored water.
RK79D203K01_01en.indd 15 2022/02/14 16:52:42
016

Primary/sanitary Plate heat exchanger
Water (Primary) - Water (Sanitary)
1
3
4
2
Installation
4
16
en
How to remove the module
1. Remove the FRONT PANEL (four screws) 2. Remove the four screws that x the MODULE FRONT
and FRAME
3. CYLINDER - MODULE
<WIRE>
Remove the 7 connectors from the MODULE BOX.
Remove the wires from the top of the MODULE BOX
and the wire clamps on the Primary/Sanitary P-HEX.
·UNIT SIDE
Put them together under the CONT BOX
·MODULE SIDE
Put them together on the MODULE BOX
<PIPE>
Remove the following four points.
Plate heat exchanger (Water/Brine - Refrigerant) IN
Plate heat exchanger (Water/Brine - Refrigerant) OUT
3 WAY VALVE - Primary flow (from MODULE)
Primary Water Pump-Water in (Return)
Room thermostat
If tting a new room thermostat for this system;
• Position it out of direct sunlight and draughts
• Position it away from internal heat sources
• Position it in a room without a TRV on the radiator/heat emitter.
• Position it on an internal wall
Note:
Do not position the thermostat excessively close to the ex-
ternal wall.
The thermostat may detect the temperature of the wall, which
could affect appropriate control of the room temperature.
• Position it approx. 1.5 m from oor level
Ambient temperature thermistor (TH7)
Please install the ambient temperature thermistor (TH7) in a place
where external influences such as wind and sunlight are mini-
mized. Please install the ambient temperature thermistor (TH7)
cable in a place where people cannot touch. Run the cable inside
the wall or above the ceiling when installing the ambient tempera-
ture thermistor (TH7) cable. Use a xable wiring cover to secure
the wiring from the top of the unit to the wall or ceiling.
Repositioning
If you need to move the heat pump unit to a new position FUL-
LY DRAIN the heat pump unit before moving to avoid damage
to the unit. (See earlier instruction transportal handling.)
Warning
Refrigerant pipes connection shall be accessible for main-
tenance purposes.
RK79D203K01_01en.indd 16 2022/02/14 16:52:47
017

Installation
4
17
en
Frame
Module handles
5. After pulling MODULE BOX out
Fit the cap or plastic bag etc. (local supply) on exible pipes.
Please bundle the wires during transportation and secure
them with band etc. on the module.
* The module is then re-installed in reverse order.
When returning the Module unit assy to the unit, be careful
not to get your hands caught between the unit and the Module
unit assy. Hold the module unit assy with nylon bands (Module
handles), NOT the corners of it (HAZARD).
4. Pull the MODULE BOX out by using the MODULE HANDLES
RK79D203K01_01en.indd 17 2022/02/14 16:52:49
018

Installation
4
18
en
4.2 Water/Ambient Loop Quality and
System Preparation
<Water>
General
• The water in both primary and sanitary circuit should be clean
and with pH value of 6.5-8.0
• The followings are the maximum values;
Calcium: 100 mg/L, Ca hardness: 250 mg/L
Chloride: 100 mg/L, Copper: 0.3 mg/L
• Other constituents should be to European Directive 98/83 EC
standards.
• In known hard water areas, to prevent/minimise scaling, it is
beneficial to restrict the routine stored water temperature
(DHW max. temp.) to 55°C.
Anti-Freeze
Anti-freeze solutions should use propylene glycol with a toxicity
rating of Class 1 as listed in Clinical Toxicology of Commercial
Products, 5th Edition.
Note:
1. Ethylene glycol is toxic and should NOT be used in the
primary water circuit in case of any cross-contamination
of the sanitary circuit.
2. For 2-zone valve ON/OFF control, propylene glycol
should be used.
<Ambient loop>
General
• The water in both primary and sanitary circuit should be clean
and with pH value of 6.5-8.0
• The followings are the maximum values;
Calcium: 100 mg/L, Ca hardness: 250 mg/L
Chloride: 100 mg/L, Copper: 0.3 mg/L
• Other constituents should be to European Directive 98/83 EC
standards.
• Installer MUST fill water or the following antifreeze solution
mix when filling the ambient loop.
• The water in Ambient loop should be clean and with pH value
of 6.5-8.0.
38 WT% propylene glycol
29 WT% bioethanol
25 WT% ethylene glycol
Note: DO NOT use Inorganic brine.
• Fit the local supply particle filter on the incoming pipe.
• Use the heat pump unit ONLY in a closed system for ambient
loop. Using the system in an open system will lead to
excessive corrosion.
Installation (primary water circuit)
• Before installation heat pump unit, thoroughly cleanse pipework
of building debris, solder etc using a suitable chemical cleansing
agent.
• Flush the system to remove chemical cleanser.
•
The responsible installer should decide if anti-freeze solution is
necessary for each site’s conditions. Corrosion inhibitor however
should ALWAYS be used.
Installation (Ambient loop)
• Before installation of heat pump unit, thoroughly cleanse
pipework of building debris, solder etc using a suitable chemical
cleansing agent.
• Flush the system to remove chemical cleanser.
Amount of brine required in the ambient loop
• As a measure of the brine filling amount, please make
approximation of 1 L/m of collector hose length.
When using chemical cleansers and inhibitors always follow
manufacturer’s instructions and ensure the product is appro-
priate for the materials used in the circuit.
How to access Internal Components and
Control and Electrical Box
<A> Opening the front panel
1. Remove the two lower screws and two upper screws.
2. Slide front panel upwards to slightly and open carefully.
3. Disconnect the relay connector connecting main remote
controller cable and the control board cable.
<B> Accessing the back of the control and electrical box
The control and electrical box has 8 holding screws and is
hinged on the right hand side.
1. Remove the 4 screws xing the metal plate (with a warning
label) in front of the electrical box, then lift the plate to remove.
2. Remove the holding screws on the control and electrical box.
3. The control and electrical box can then be swung forward on
the right hand hinges.
Note:
After servicing, re-secure all cables using straps provided.
Reconnect main remote controller cable to its relay connector.
Replace front panel and resecure screws.
When using chemical cleansers and inhibitors always follow
manufacturer’s instructions and ensure the product is appro-
priate for the materials used in the water circuit.
RK79D203K01_01en.indd 18 2022/02/14 16:52:49
019

Installation
4
19
en
<Figure 4.3.1>
0
−25
−20
−15
−10
−5
0
5
10 20 30
Anti-freeze concentration [%]
Freezing temperature [°C]
40 50
Freezing temperature [°C]
Anti-freeze concentration [%]
4.3 Water Pipe Work
Hot Water Pipework
The heat pump unit is UNVENTED. When installing un-
vented hot water systems building regulations part G3 (Eng-
land and Wales), P3 (Scotland) and P5 (Northern Ireland)
should be adhered to. If outside of the UK please adhere to
your own country’s regulations for unvented hot water sys-
tems.
Connect the flow for the DHW to pipe A (Figure 3.1).
The function of the following safety components of the heat pump
unit should be checked on installation for any abnormalities;
• Pressure relief valve (Primary circuit and Tank)
• Expansion vessel pre-charge (gas charge pressure)
The instruction on the following pages regarding safe discharge
of hot water from Safety devices should be followed carefully.
• The pipework will become very hot, so should be insulated to
prevent burns.
• When connecting pipework, ensure that no foreign objects
such as debris etc. enter the pipe work.
Cold Water Pipework
Cold water to the suitable standard (see section 4.2) should be
introduced to the system by connecting pipe B (Figure 3.1) using
appropriate ttings.
Negative pressure prevention
To prevent negative pressure effecting DHW tank, installer
should install appropriate pipework or use appropriate devices.
Pipework Connections
Connections to the heat pump unit should be made using the
22 mm or 28 mm compression as appropriate.
When connecting DHW pipes using compression ttings, insert
copper liner for DHW pipe (accessory parts) into the pipes and
tighten them from 0.75 to 1.25 turns.
Do not over-tighten compression ttings as this will lead to
deformation of the olive ring and potential leaks.
Note:
Before brazing pipes in the eld, protect pipes on the
cylinder unit using wet towels etc as "heat shield".
Insulation of Pipework
• All exposed water pipework should be insulated to prevent
unnecessary heat loss and condensation. To prevent
condensate entering the heat pump unit, the pipework and
connections at the top of the heat pump unit should be
carefully insulated.
• Cold and hot water pipework should not be run close
together where possible, to avoid unwanted heat transfer.
• Pipework should be insulated with suitable pipe insulation
material with a thermal conductivity of ≤ 0.04 W/m.K.
Filling the System (Primary Circuit)
1. Check and charge expansion vessel.
2. Check all connections including factory tted ones are tight.
3. Insulate pipework.
4. Thoroughly clean and ush, system of all debris. (see
section 4.2 for instruction.)
5. Fill heat pump unit with sanitary water. Fill primary heating
circuit with water and suitable anti-freeze and inhibitor as
necessary. Always use a lling loop with double check valve
when lling the primary circuit to avoid back ow
contamination of water supply.
When connecting metal pipes of different materials insulate
the joints to prevent a corrosive reaction taking place which
will damage the pipework.
6. Check for leakages. If leakage is found, retighten the nut
onto the connections.
7. Pressurise system to 1 bar.
8. Release all trapped air using air vents during and following
heating period.
9. Top up with water as necessary. (If pressure is below 1 bar)
RK79D203K01_01en.indd 19 2022/02/14 16:52:49
020