Daikin EKHVMYD50ABV1 [14/64] General precautions concerning water circuit
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Daikin EKHVMYD50ABV1 [14/64] General precautions concerning water circuit

Daikin EKHVMYD50ABV1 [14/64] General precautions concerning water circuit
Installation manual
12
EKHVMRD50+80ABV1 + EKHVMYD50+80ABV1
Daikin Altherma indoor unit
4P404420-1 – 2015.04
6.2. General precautions concerning water circuit
Before continuing the installation of the unit, check the following
points:
■ The maximum water pressure is 4 bar.
■ The maximum water temperature is 80°C.
■ Provide adequate safeguards in the water circuit to be sure that
the water pressure will never exceed the maximum allowable
working pressure (4 bar).
■ Shut-off valves from flexible hoses delivered with the unit should
be installed so that normal servicing can be accomplished
without draining the system.
■ Drain taps must be provided at all low points of the system to
permit complete drainage of the circuit during maintenance or
service to the unit. A drain valve is provided in the unit to drain
the water from the unit water system.
■ Be sure to provide a proper drain for the pressure relief valve to
avoid any water coming into contact with electrical parts.
■ Air vents must be provided at all high points of the system. The
vents shall be located at points which are easily accessible for
servicing. An automatic air purge is provided inside the indoor
unit. Check that this air purge valve is not tightened too much so
that automatic release of air in the water circuit remains
possible.
■ Take care that the components installed in the field piping can
withstand the water pressure and temperature.
■ Always use materials which are compatible with the water used
in the system and with the materials used on the unit.
■ Select piping diameter in relation to required water flow and
available ESP of the pump.
When designing the hydraulic system always consider the available
static pressure of the indoor unit.
Check that the total water volume in the installation, excluding the
internal water volume of the unit, is 20 l minimum.
NOTE
In refurbishment applications, the water system will
already be fixed. It is utmost important for these kind of
installations to know the parameters mentioned above.
ESP (kPa) External static pressure (kPa)
flow (l/min) Flow (l/min)
Without 3-way valve
Including 3-way valve
Maximum external static pressure if
∆T=10°C (heating)
Maximum external static pressure if
∆T=5°C (heating)
Maximum external static pressure if ∆T=5°C (cooling)
50/80 Identification of the unit capacity
0
5 7 9 11131517192123252729
10
20
30
40
50
60
70
80
90
100
ESP [kPa]
Flow [l/min]
∆T=5°C
∆T=10°C
50
50
50
80
80
80
NOTE
■ The ESP curves are the maximum ESP curves for
different ∆T types (pump rpm=4000 for ∆T=5°C;
pump rpm=3600 for ∆T=10°C). The pump of the
indoor module is inverter controlled and controls
to have a fixed ∆T between return and leaving
water temperature.
■ In case of installing a domestic hot water tank
there is an additional pressure drop over the
3-way valve (delivered as accessory with the
tank).
NOTE
When replacing an old gas or oil boiler by an air to
water pump system:
■ please always check the specifications of the
pump of the old unit;
■ if the external static pressure of that pump is
higher than the external static pressure of the air
to water pump system, please install an additional
pump with higher external static pressure in
combination with a balancing bottle.
WARNING
In most applications this miminum water volume will have a
satisfying result.
In critical processes or in rooms with a high heat load
though, extra water volume might be required
1 Air to water pump system
2 Balancing bottle
3 High external static pressure pump
4 High external static pressure system
3 421

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