9.4.1 Check the water circuit
9.4 Water piping
All piping lengths and distances have been taken into consideration.
Requirements
The maximum allowed thermistor cable length is 20m. This is the maximum allowable distance between the domestic
hot water tank and the unit (only for installations with a domestic hot water tank).The thermistor cable supplied with the
domestic hot water tank is 10m in length.In order to optimize efficiency we recommend installing the 3-way valve and
the domestic hot water tank as close as possible to the unit.
If the installation is equipped with a domestic hot water tank (field supply), please refer to the domestic hot water tank
Installation And Owner's Manual. If there is no glycol (anti-freeze) in the system and there is a power supply or pump
failure, drain the system (as shown in the figure below).
NOTE
If water is not removed from the system in freezing weather when unit is not used, the frozen water may damage the
water circle parts.
NOTE
31
The unit is 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
：
5
4
4.2
4.1
10
FHL1
FHL2
FHLn
19
20
Indoor
Outdoor
1
15
16
14
12
14
Modbus
16
2
Assembly unit
Code
Assembly unit
Main unit
15
Shut-off valve (Field supply)
User interface(accessory)
Filling valve (Field supply)
Balance tank
Automatic air purge valve
(Field supply)
19
Drainage valve (Field supply)
Collector/distributor (Field supply)
Drainage valve
10
P_o: Outside circulation pump (Field supply)
Expansion vessel(field supply)
12
FHL
1…n
Floor heating loop (Field supply)
Filter (Accessory)
Bypass valve (field supply)
14
16
20
Code
1
2
4
4.1
4.2
5
EN
IDOLA M 3.2
04÷16T
CAUTION
34
Ethylene Glycol and Propylene Glycol are TOXIC
WARNING
NOTE
During filling, it might not be possible to remove all air in the system. Remaining air will be removed through the
automatic air purge valves during the first operating hours of the system. Topping up the water afterwards might be
required.
The water pressure will vary depending on the water temperature (higher pressure at higher water temperature).
However, at all times water pressure should remain above 0.3 bar to avoid air entering the circuit.
The unit might drain-off too much water through the pressure relief valve.
Water quality should be complied with EN 98/83 EC Directives.
Detailed water quality condition can be found in EN 98/83 EC Directives.
Connect the water supply to the filling valve and open the valve.
Make sure the automatic air purge valve is open (at least 2 turns).
Fill with water pressure of approximately 2.0 bar. Remove air in the circuit as much as possible using the air purge
valves. Air in the water circuit could lead to malfunction of the backup electric heater.
9.5 Filling water
Do not fasten the black plastic cover on
the vent valve at the topside of the unit
when the system is running. Open air
purge valve, turn anticlockWise at least
2 full turns to release air from the
system.
CounterclockWise rotation, remove the flow switch.
Drying the flow switch completely.
When the unit is not running for a long time, make sure the unit is powered on all the time. If you want to cut off the
power, the water in the system pipe needs to be drained clean to avoid the unit and pipeline system being damaged by
freezing. Also the power of the unit needs to be cut off after water in the system is drained off.
Cod. 3QE47850 - Rev. 00 - 03/2022