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4 Preparation
c
a
Snow cover or shed
b
Pedestal
c
Prevailing wind direction
d
Air outlet
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. See
unit" [ 4 10] for more details.
outdoor
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.
4.2
Preparing 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.
Installation manual
8
a
c
b
"5.2 Mounting the
4.2.1
Water piping lengths and height
difference
In case of *HY2KOMB28+32AA gas boiler
D1
D3
H1
a
D1
a
Outdoor unit
b
*HY2KOMB28+32AA
c
3-way valve
d
Space heating circuit
e
DHW tank (if applicable)
What?
H1 Maximum height difference between
outdoor unit and
*HY2KOMB28+32AA gas boiler
— Maximum total length of the water
piping (indoor part + outdoor part)
D1 Maximum length of the outdoor part
of the water piping (to prevent
freeze-up of the water piping)
D2 Maximum distance between
*HY2KOMB28+32AA gas boiler and
DHW tank (if applicable)
D3 Maximum distance between outdoor
unit and *HY2KOMB28+32AA gas
boiler
(a)
Only for NHY2KOMB28+32AA: a distance of up to 30 m is
allowed in case the water circuit is protected against freezing by
glycol, or when a domestic hot water tank (e) is installed.
If...
Glycol?
Ø
Condition
Water
3/4" ΔT 5°C → 11.5 l/min
(without
ΔT 8°C → 7.2 l/min
glycol)
1" ΔT 5°C → 11.5 l/min
ΔT 8°C → 7.2 l/min
Water +
1" Start-up with glycol
glycol
at –15°C → 7.0 l/min
ΔT 5°C with glycol at
20°C → 12.8 l/min
ΔT 8°C with glycol at
20°C → 8.0 l/min
(a)
Based on capacity of 4 kW
(b)
External static pressure calculated with 10×(90° elbow)
Hydronic Piping Calculation tool
For other cases the maximum water piping length can be determined
using the Hydronic Piping Calculation tool. The Hydronic Piping
Calculation tool is part of the Heating Solutions Navigator which can
Daikin Altherma H Hybrid – Heat pump module
b
c
M
d
D2
e
Distance
Depends on the
expansion vessel
(option on
*HY2KOMB28+32AA
gas boiler).
A distance of 10 m is
recommended.
Depends on the
external static pressure
(ESP) of the system.
(a)
10 m
10 m
See table below.
Then D3...
(a)
(b)
(b)
ESP
ESP
25 kPa
35 kPa
16 m
8.5 m
63 m
45 m
89 m
54 m
304 m
224 m
38 m
25 m
2 m
—
134 m
85 m
EJHA04AAV3
4P530607-1D – 2020.02
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