b Freeze protection valve (for inside the outdoor unit)
c Vacuum breaker (for outside the outdoor unit)
d General safety precautions
e Addendum book for optional equipment
a Outdoor unit
b Gas boiler
c Space heating circuit
d Instant domestic hot water
Installation manual
5
3 About the system
ab c
e
d
M
e5
≤10 m
e1
e4
e2
e3
f1f2
f3
f4
f5
a
b
c
d
e5
0
–30–25–20–15–10–505
20
30
40
50
60
10
Ta (°C)
T
min
(°C)
Dedicated gas boiler + Domestic hot water via tank
a Outdoor unit
b Gas boiler
c Space heating circuit
d Domestic hot water via tank
e Motorised 3‑way valve
3.1.2Third-party gas boiler
For existing installations, you do not need to buy a new gas boiler.
You can reuse the existing gas boiler, and the wiring of the old
thermostat.
Using this gas boiler, you can only produce domestic hot water as
instant domestic hot water by gas boiler.
Third-party gas boiler + Instant domestic hot water
f4: Disconnect old wiring from the gas boiler, and connect it
to new wiring
f5: Connect new wiring to the outdoor unit
Third-party gas boiler + Domestic hot water via tank
Not possible.
Setpoint of the third-party gas boiler
To prevent freeze-up of the water piping, the third-party gas boiler
must have a fixed setpoint ≥55°C, or a weather-dependent setpoint
≥T
.
min
TaOutdoor temperature
T
Minimum weather-dependent setpoint for third-party gas
min
boiler
3.2Freeze protection
You must protect the system against freezing. This involves:
▪ Choosing between glycol and freeze protection valves
▪ Installing the bottom plate heater
a Outdoor unit
b Gas boiler
c Space heating circuit
d Instant domestic hot water
e1~e5 Parts of mandatory options EKADDONJH and
Installation manual
6
f1~f5 Connection of user interface (you can reuse old wiring):
EKADDONJH2 (= connection kit for third-party gas boiler).
For installation instructions, see the installation manual of
the connection kit.
e1: External pump (EKADDONJH)
e2: External pump cable – Power supply (EKADDONJH2)
e3: External pump cable – PWM signal (EKADDONJH2)
e4: Distance between external pump and gas boiler must
be as short as possible
e5: Non-return valve (EKADDONJH2)
f1: Remove old thermostat
f2: Install new user interface
f3: Reuse old wiring
3.2.1Glycol or freeze protection valves
Frost can damage the system. To prevent the hydraulic components
from freezing, the software is equipped with special frost protection
functions, that include the activation of pump in case of low
temperatures.
However, in case of a power failure, these functions cannot
guarantee protection.
Do one of the following to protect the water circuit against freezing:
▪ Add glycol to the water. Glycol lowers the freezing point of the
water.
▪ Install freeze protection valves. Freeze protection valves drain the
water from the system before it can freeze.
NOTICE
If you add glycol to the water, do NOT install freeze
protection valves. Possible consequence: Glycol leaking
out of the freeze protection valves.
INFORMATION
For more information about glycol and freeze protection
valves, see "5.3.3 To protect the water circuit against
freezing"on page12.
3.2.2Bottom plate heater
To prevent freeze-up of the bottom plate you can install the optional
bottom plate heater. In certain circumstances this is required.
Bottom plate heater (EKBPHT04JH)
▪ Prevents freeze-up of the bottom plate.
▪ Required in areas with ambient temperature <–5°C and high
relative humidity for at least 3 consecutive days.
▪ For installation instructions, see the installation manual of the
▪ If you install the bottom plate heater, you may lower the
operation range of the heat pump to Ta≥–15°C using
field setting [8-0E]=–15°C.
▪ If you do not install the bottom plate heater, keep
[8-0E]=–5°C.
4Preparation
4.1Preparing the installation site
WARNING
The appliance shall be stored in a room without
continuously operating ignition sources (example: open
flames, an operating gas appliance or an operating electric
heater).
4.1.1Installation site requirements of the
outdoor unit
Mind the following spacing guidelines:
WARNING
The appliance shall be stored so as to prevent mechanical
damage and in a well-ventilated room without continuously
operating ignition sources (example: open flames, an
operating gas appliance or an operating electric heater).
WARNING
Make sure installation, servicing, maintenance and repair
comply with instructions from Daikin and with applicable
legislation (for example national gas regulation) and are
executed only by authorised persons.
4.1.2Additional installation site requirements
of the outdoor unit in cold climates
Protect the outdoor unit against direct snowfall and take care that the
outdoor unit is NEVER snowed up.
a Air outlet
b Air inlet
NOTICE
The height of the wall on the outlet side of the outdoor unit
MUST be ≤1200mm.
The outdoor unit is designed for outdoor installation only, and for the
following ambient temperatures:
Space heating operation–15~25°C
Domestic hot water production–15~35°C
Special requirements for R32
The outdoor unit contains an internal refrigerant circuit (R32), but
you do NOT have to do any refrigerant field piping, or refrigerant
charging.
The total refrigerant charge in the system is ≤1.842 kg, so the
system is NOT subjected to any requirements to the installation
room. However, mind the following requirements and precautions:
WARNING
▪ Do NOT pierce or burn.
▪ Do NOT use means to accelerate the defrosting
process or to clean the equipment, other than those
recommended by the manufacturer.
▪ Be aware that R32 refrigerant does NOT contain an
odour.
a Snow cover or shed
b Pedestal
c Prevailing wind direction
d Air outlet
In any case, provide at least 300mm of free space below the unit.
Additionally, make sure the unit is positioned at least 100mm above
the maximum expected level of snow. See "5.2 Mounting the
outdoor unit"on page10 for more details.
In heavy snowfall areas it is very important to select an installation
site where the snow will NOT affect the unit. If lateral snowfall is
possible, make sure that the heat exchanger coil is NOT affected by
the snow. If necessary, install a snow cover or shed and a pedestal.
4.2Preparing water piping
NOTICE
In case of plastic pipes, make sure they are fully oxygen
diffusion tight according to DIN 4726. The diffusion of
oxygen into the piping can lead to excessive corrosion.
NOTICE
Expansion vessel. Make sure that an expansion vessel is
installed in the water circuit (at the space heating water
inlet of the boiler).
In case of *HY2KOMB28+32AA gas boiler, the expansion
vessel is available as option.
In case of third-party gas boiler, the expansion vessel is
field supplied.
For more information about the expansion vessel, see the
installer reference guide.
▪ Filter. It is strongly recommended to install an additional filter on
the heating water circuit. Especially to remove metallic particles
from foul heating piping, it is recommended to use a magnetic or
cyclone filter, which can remove small particles. Small particles
may damage the unit and will NOT be removed by the standard
filter of the heat pump system.
4.2.1Water piping lengths and height
In case of *HY2KOMB28+32AA gas boiler
H1 Maximum height difference between
— Maximum total length of the water
D1 Maximum length of the outdoor part
D2 Maximum distance between outdoor
D3 Maximum distance between outdoor
Glycol?ØCondition
Water
(without
glycol)
Water +
glycol
Installation manual
8
difference
a Outdoor unit
b *HY2KOMB28+32AA gas boiler
c 3-way valve
d Space heating circuit
e DHW tank (if applicable)
What?Distance
outdoor unit and
*HY2KOMB28+32AA gas boiler
piping (indoor part + outdoor part)
of the water piping (to prevent
freeze-up of the water piping)
unit and DHW tank (if applicable)
unit and *HY2KOMB28+32AA gas
boiler
If...Then D3...
(a)
3/4" ΔT 5°C → 11.5l/min16m8.5m
ΔT 8°C → 7.2l/min63m45m
1" ΔT 5°C → 11.5l/min89m54m
ΔT 8°C → 7.2l/min304m224m
1" Start-up with glycol
at –15°C → 7.0l/min
ΔT 5°C with glycol at
20°C → 12.8l/min
ΔT 8°C with glycol at
20°C → 8.0l/min
(a) Based on capacity of 4kW
ESP External static pressure calculated with 10×(90° elbow)
Depends on the
expansion vessel
(option on
*HY2KOMB28+32AA
gas boiler)
Depends on the
external static pressure
(ESP) of the system.
30m
(but restricted by D2
when a DHW tank is
installed)
10m
See table below.
ESP 25kPa ESP 35kPa
38m25m
2m—
134m85m
In case of third-party gas boiler
a Outdoor unit
b Third-party gas boiler
c Space heating circuit
d External pump
What?Distance
H1 Maximum height difference between
outdoor unit and third-party gas
boiler
— Maximum total length of the water
piping (indoor part + outdoor part)
Depends on the
expansion vessel in the
third-party gas boiler.
Depends on the
external static pressure
(ESP) of the system.
D1 Maximum distance between outdoor
10m
unit and external pump
D2 Distance between external pump and
As short as possible.
gas boiler
D3 Maximum length of the outdoor part
30m
of the water piping (to prevent
freeze-up of the water piping)
D4 Maximum distance between outdoor
See table below.
unit and third-party gas boiler
If...Then D4...
Glycol?ØCondition
Water
(without
glycol)
3/4" ΔT 5°C → 11.5l/min20m13m
ΔT 8°C → 7.2l/min68m50m
1" ΔT 5°C → 11.5l/min123m88m
(a)
ESP 25kPa ESP 35kPa
ΔT 8°C → 7.2l/min340m260m
Water +
glycol
1" Start-up with glycol
at –15°C → 7.0l/min
ΔT 5°C with glycol at
44m30m
36m14m
20°C → 12.8l/min
ΔT 8°C with glycol at
170m120m
20°C → 8.0l/min
(a) Based on capacity of 4kW
ESP External static pressure calculated with 10×(90° elbow)
4.2.2To check the water volume and flow rate
Minimum water volume
Check that the total water volume in the installation is minimum
20litre, the internal water volume of the outdoor unit NOT included.
INFORMATION
In critical processes, or in rooms with a high heat load,
extra water might be required.
NOTICE
When circulation in each space heating loop is controlled
by remotely controlled valves, it is important that the
minimum water volume is guaranteed, even if all of the
valves are closed.
A minimum flow rate must be guaranteed so that the outdoor unit
does not go in high pressure error (A5). For guidelines on flow rates,
see the tables in "4.2.1 Water piping lengths and height difference
"on page8.
NOTICE
When circulation in each or certain space heating loops is
controlled by remotely controlled valves, it is important that
the minimum flow rate is guaranteed, even if all valves are
closed. In case the minimum flow rate cannot be reached,
the heat pump generates a high pressure error (A5).
4.3Preparing electrical wiring
4.3.1Overview of electrical connections for
external and internal actuators
NOTICE
Field wiring – Temperature. Make sure that all field wiring
withstands 90°C.
In case of system with *HY2KOMB28+32AA gas boiler
Connections to outdoor unit:
ItemDescriptionWiresMaximum
running
current
Power supply
1Power supply for
2+GND
outdoor unit
User interface
2User interface2
Optional equipment
3Bottom plate heater2+GND
4Outdoor ambient
2
temperature sensor
5LAN adapter2
Field supplied components
6Domestic hot water
2+GND
pump
(a) Refer to name plate on outdoor unit.
(b) Cable section 0.75mm² till 1.25mm²; maximum length:
200m.
(c) Part of optional equipment
(d) Minimum cable section 0.75mm².
(e) Cable section 0.75mm² till 1.25mm²; maximum length:
200m. These wires MUST be sheathed. Recommended
strip length: 6 mm.
NOTICE
More technical specifications of the different connections
are indicated on the inside of the outdoor unit.
Connections to *HY2KOMB28+32AA gas boiler:
(a)
(b)
(c)
(d)
(e)
(d)
ItemDescriptionWiresMaximum
running
current
33‑way valve3100mA
4Domestic hot water
2
(d)
tank thermistor
5Room thermostat/heat
2100mA
pump convector
(a) Refer to name plate on gas boiler.
(b) Cable section 0.75mm² till 1.25mm²; maximum length:
200m.
(c) Cable section 0.75mm² till 1.25mm².
(d) The thermistor and connection wire (11m) are available as
option (EKTH3 or EKTH4).
NOTICE
More technical specifications of the different connections
are indicated on the inside of the gas boiler.
In case of system with third-party gas boiler
Connections to outdoor unit:
ItemDescriptionWiresMaximum
running
current
Power supply
1Power supply for
2+GND
(a)
outdoor unit
User interface
2User interface2
(b)
External pump + bivalent signal
3External pump2 and 2+GND
4Bivalent signal for third-
2
(c)
(d)
party gas boiler
Optional equipment
5Bottom plate heater2+GND
6Outdoor ambient
2
(e)
(d)
temperature sensor
7LAN adapter2
(a) Refer to name plate on outdoor unit.
(b) Cable section 0.75mm² till 1.25mm²; maximum length:
200m.
(c) The external pump is part of mandatory option
EKADDONJH; the 2 external pump cables (PWM signal
and power supply) are part of mandatory option
EKADDONJH2.
(d) Minimum cable section 0.75mm².
(e) Part of optional equipment
(f) Cable section 0.75mm² till 1.25mm²; maximum length:
200m. These wires MUST be sheathed. Recommended
strip length: 6 mm.
(f)
NOTICE
More technical specifications of the different connections
are indicated on the inside of the outdoor unit.
1 Open the top plate.
2 Open the front plate.
3 If necessary, open the rear plate. This is, for example,
necessary in the following cases:
▪ When you install the freeze protection valve inside the
outdoor unit.
▪ When you install the bottom plate heater.
Option 1: On mounting feet "flexi-foot with strut"
a Maximum snowfall height
Option 2: On plastic mounting feet
5.2Mounting the outdoor unit
5.2.1To provide the installation structure
This topic shows different installation structures. For all, use 4 sets
of M8 or M10 anchor bolts, nuts and washers. In any case, provide
at least 300 mm of free space below the unit. Additionally, make
sure the unit is positioned at least 100 mm above the maximum
expected level of snow.
INFORMATION
The maximum height of the upper protruding part of the
bolts is 15mm.
b Bottom frame
c Drain plug (delivered as accessory)
d Hose (field supply)
5.2.4To prevent the outdoor unit from falling
over
In case the unit is installed in places where strong wind can tilt the
unit, take following measure:
1 Prepare 2 cables as indicated in the following illustration (field
supply).
2 Place the 2 cables over the outdoor unit.
3 Insert a rubber sheet between the cables and the outdoor unit
to prevent the cables from scratching the paint (field supply).
4 Attach the ends of the cables and tighten them.
5.2.3To provide drainage
Make sure that condensation water can be evacuated properly.
NOTICE
Cold climates. If the unit is installed in a cold climate:
▪ Take adequate measures so that the evacuated
condensate CANNOT freeze.
▪ Do NOT use the drain plug and drain hose with the
outdoor unit. Possible consequence: Drain water
might freeze, decreasing the heating capacity.
NOTICE
Provide at least 300 mm of free space below the unit.
Additionally, make sure the unit is positioned at least
100mm above the expected level of snow.
Except in cold climates, use the drain plug and a hose for drainage.
5.3Connecting the water piping
5.3.1To connect the water piping
NOTICE
In case of old heating installations, it is recommended to
use a dirt separator. Dirt or sediment from the heating
installation can damage the unit and reduce its lifetime.
NOTICE
Do NOT use excessive force when connecting the piping.
Deformation of the piping can cause malfunctioning of the
unit. Make sure that the tightening torque does NOT
exceed 30N•m.
NOTICE
Shut-off valves. We recommend to connect shut-off
valves to facilitate service and maintenance. They are
available as option (EKBALLV1). If you do not install shutoff valves, make sure to install air purge valves on the
water inlet and outlet.