EAS ELECTRIC ETHKH160 Manual De Instrucciones página 68

5.6 Water pipework
All piping lengths and distances have been taken into consideration.
Refer to table. 5-1.
■ If the installation is equipped with a domestic hot water tank
(optional), please refer to the domestic hot water tank
Installation & owner's manual.
■ If no glycol is in the system, in case of a power supply failure
or pump operating failure, drain the system (as suggested
in the figure below).
Water inlet
Drain port
Water outlet
Drain valve
When water is at standstill inside the system, freezing is
very likely to happen and damaging the system in the
process.
Checking the water circuit
The units are equipped with a water inlet and water outlet for
connection to a water circuit. This circuit must be provided by a
licensed technician and must comply with local laws and regulations.
The unit is only to be used in a closed water system.
Application in an open water circuit can lead to excessive
corrosion of the water piping.
Example
Outdoor
1
NOTE
Shut-off valve
Drain channel
Indoor
2
2.5
2.2
2.6
2.3
2.7
2.4 2.1
2.1
2.10 2.9 2.8
19 19
16
21
6
20
5
21
Modbus
Before continuing the installation of the unit, check the following
points:
■ The maximum water pressure = 3 bar(g).
■ The maximum water temperature is 70°C according to safety
device setting.
■ Always use materials which are compatible with the water used in
the system and with the materials used in the unit.
■ Take care that the components installed in the field piping can
withstand the water pressure and temperature.
■ Drain taps must be provided at all low points of the system to
permit complete drainage of the circuit during maintenance.
■ Air vents must be provided at all high points of the system. The
vents should be located at points which are easily accessible for
servicing. An automatic air purge is provided inside the unit. Check
that this air purge valve is not tightened too much so that automatic
release of air in the water circuit remains possible.
Checking the water volume and expansion vessel pre-pressure
The unit is equipped with an expansion vessel of 5 litre which has a
default pre-pressure of 1.5 bar(g).
To assure proper operation of the unit, the pre-pressure of the
expansion vessel might need to be adjusted and the minimum and
maximum water volume must be checked.
1. Check that the total water volume in the installation, excluding the
internal water volume of the unit, is 20L minimum. Refer to
"TECHNICAL SPECIFICATIONS" to know the internal water
volume of the unit.
■ In most applications this minimum 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.
■ When circulation in each space heating loop is controlled by
remotely controlled valves, it is important that this minimum
water volume is kept even if all the valves are closed.
1 Outdoor unit
2 Indoor unit
2.1 PUMP_I
(built-in circulating pump)
2.2 Plate heat exchanger
3
(air to water heat exchanger)
2.3 IBH (built-in backup heater)
2.4 Manometer (built-in)
2.5 Air vent valve (built-in)
2.6 Expansion vessel (built-in)
2.7 Safety valve
(built-in pressure relief)
2.8 Water inlet
2.9 Water outlet
2.10 Refrigerant connections
3 User interface (accessory)
5 Buffer tank (field supply)
14
T1
6.1
7
M1
6.2
16
NOTE
6 Balance tank (field supply)
6.1 Air vent valve
6.2 Drain valve
7 P_o: Outside circulating pump
(field supply)
14 Expansion vessel (field supply)
16 Filter (accessory)
19 Shut-off valve (field supply)
20 Fill valve (field supply)
21 Drain valve (field supply)
25 Collector (field supply)
26 Bypass valve (field supply)
FHL1...n Floor heating loop
(field supply)
M1...n Motorized valve
(field supply)
T1...n Room thermostat
(field supply)
T2 Tn
25
Mn
M2
FHL1 FHL2 FHLn
26
V.1