Water Piping Lengths And Height Difference; To Check The Water Volume And Flow Rate - Daikin Altherma EJHA04AAV3 Installation Manual

4 Preparation
▪ 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.
4.2.1 Water piping lengths and height
difference
In case of *HY2KOMB28+32AA gas boiler
D1
D3
D2
H1
a
D1
a Outdoor unit
b *HY2KOMB28+32AA gas boiler
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 outdoor
unit and DHW tank (if applicable)
D3 Maximum distance between outdoor
unit and *HY2KOMB28+32AA gas
boiler
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
ESP External static pressure calculated with 10×(90° elbow)
Installation manual
8
b c
M
d
e
Distance
Depends on the
expansion vessel
(option on
*HY2KOMB28+32AA
gas boiler)
Depends on the
external static pressure
(ESP) of the system.
30 m
(but restricted by D2
when a DHW tank is
installed)
10 m
See table below.
Then D3...
(a)
ESP 25 kPa ESP 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
In case of third-party gas boiler
D4
D3
a
H1
D1 D2
d
D3
D4
a Outdoor unit
b Third-party gas boiler
c Space heating circuit
d External pump
What?
H1 Maximum height difference between
outdoor unit and third-party gas
boiler
— Maximum total length of the water
piping (indoor part + outdoor part)
D1 Maximum distance between outdoor
unit and external pump
D2 Distance between external pump and
gas boiler
D3 Maximum length of the outdoor part
of the water piping (to prevent
freeze-up of the water piping)
D4 Maximum distance between outdoor
unit and third-party gas boiler
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
ESP External static pressure calculated with 10×(90° elbow)
4.2.2

To check the water volume and flow rate

Minimum water volume
Check that the total water volume in the installation is minimum
20 litre, 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.
Daikin Altherma hybrid monobloc – Heat pump module
b
c
Distance
Depends on the
expansion vessel in the
third-party gas boiler.
Depends on the
external static pressure
(ESP) of the system.
10 m
As short as possible.
30 m
See table below.
Then D4...
(a)
ESP 25 kPa ESP 35 kPa
20 m 13 m
68 m 50 m
123 m 88 m
340 m 260 m
44 m 30 m
36 m 14 m
170 m 120 m
EJHA04AAV3
4P530607-1B – 2018.10