Formula To Calculate The Expansion Vessel Pre-Pressure; To Check The Water Volume And Flow Rate - Daikin Altherma EJHA04AAV3 Installer's Reference Manual

8 Preparation
▪ Zn-coated parts. Never use Zn-coated parts in the water circuit.
Because the unit's internal water circuit uses copper piping,
excessive corrosion may occur.
▪ Non-brass metallic piping. When using non-brass metallic
piping, insulate the brass and non-brass properly so that they do
NOT make contact with each other. This to prevent galvanic
corrosion.
▪ Valve – Separating circuits. When using a 3-way valve in the
water circuit make sure that the domestic hot water circuit and the
floor heating circuit is fully separated.
▪ Valve – Change‑over time. When using a 2-way valve or a 3-way
valve in the water circuit, the maximum change-over time of the
valve must be 60 seconds.
▪ 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.
▪ Dirt separator – Old heating installations. 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. The domestic hot water circuit can also be
protected by a filter to prevent failure during domestic hot water
operation.
▪ Domestic hot water tank – Capacity. To avoid stagnation of
water, it is important that the storage capacity of the domestic hot
water tank meets the daily consumption of domestic hot water.
▪ Domestic hot water tank – After installation. Immediately after
installation, the domestic hot water tank must be flushed with fresh
water. This procedure must be repeated at least once a day the
first 5 consecutive days after installation.
▪ Domestic hot water tank – Standstills. In cases where during
longer periods of time there is no consumption of hot water, the
equipment MUST be flushed with fresh water before usage.
▪ Domestic hot water tank – Disinfection. For the disinfection
function of the domestic hot water tank, see
disinfection" on page 23 and
advanced" on page 64.
▪ Domestic hot water tank – installation of third-party tank
For a third-party tank, the maximum tank set point is 60°C.
See the installation manual of the domestic hot water tank for
more information.
▪ Domestic hot water tank – installation of third-party tank with
dedicated tank specifications
The dedicated tank specifications are:
2
▪ coil size is ≥1.05 m ,
▪ a sensor pocket is foreseen above the heating coil. The tank
sensor should not be in contact with water.
If the third-party tank has at least the same specifications of a
dedicated tank, the domestic hot water setting [E-07] can be
changed to 0. This allows for a temperature setpoint higher than
60°C and for the heat pump to heat up the tank. See
wizard: Options" on page 58.
▪ Thermostatic mixing valves. In accordance with the applicable
legislation, it may be necessary to install thermostatic mixing
valves.
▪ Hygienic measures. The installation must be in compliance with
the applicable legislation and may require additional hygienic
installation measures.
▪ Recirculation pump. In
legislation, it may be required to connect a recirculation pump in
between the hot water end point and the recirculation connection
of the domestic hot water tank.
Installer reference guide
28
"7.4.5 DHW pump for
"Domestic hot water control:
"Quick
accordance with the applicable
c
a b
d
a Recirculation connection
b Hot water connection
c Shower
d Recirculation pump
8.3.3 Formula to calculate the expansion vessel
pre-pressure
The pre-pressure (Pg) of the vessel depends on the installation
height difference (H). For more information on the formula, see the
manual of the third-party expansion vessel.
8.3.4

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.
b d
a
c
a Outdoor unit
b Heat exchanger
c Pump
d Boiler
e Shut‑off valve (field supply)
f Collector
g Bypass valve (field supply)
RAD1...3 Radiator (field supply)
Minimum flow rate
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 "8.3.1 Water piping lengths and height difference
" on page 26.
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).
Minimum required flow rate
(a)
7 l/min
(a) Below this value, no stable operation can be guaranteed.
Daikin Altherma Hybrid hydrosplit heat pump
e f
95°C
RAD1 RAD2 RAD3
e g
EJHA04AAV3 + EHY2KOMB28+32AA
4P531180-1 – 2018.06