38
Switch off all power including the unit power supply and backup heater and domestic hot water tank power supply (if
applicable) before removing the switch box service panel.
WARNING
Field wiring guidelines
Most field wiring on the unit is to be made on the terminal block inside the switch box. To gain access to the terminal block,
remove the switch box service panel (door 2).
9.7.3 Precautions on wiring of power supply
Fix all cables using cable ties.
A dedicated power circuit is required for the backup heater.
Installations equipped with a domestic hot water tank (field supply) require a dedicated power circuit for the booster heater.
Please refer to the domestic hot water tank Installation & Owner's Manual. Secure the wiring as shown in the picture below.
Lay out the electrical wiring so that the front cover does not rise up when doing wiring work and attach the front cover
securely.
Follow the electric wiring diagram for electrical wiring works (the electric wiring diagrams are located on the rear side of door
2.
Install the wires and fix the cover firmly so that the cover fit in properly.
9.7.4 Safety device requirment
Use the correct screwdriver to tighten the terminal screws. Small screwdrivers can damage the screw head and prevent
appropriate tightening.
Over-tightening the terminal screws can damage the screws.
Attach a ground fault circuit interrupter and fuse to the power supply line.
In wiring, make certain that prescribed wires are used, carry out complete connections, and fix the wires so that outside force
cannot affect the terminals.
Use a round crimp-style terminal for connection to the power supply terminal board. In case it cannot be used due to
unavoidable reasons, be sure to observe the following instructions.
Do not connect different gauge wires to the same power supply terminal. (Loose connections may cause overheating.)
When connecting wires of the same gauge, connect them according to the figure below.
-
-
1. Select the wire diameters( minimum value) individually for each unit based on the table 9-1 and table 9-2
，
where the rated
current in table 9-1 means MCA in table 9-2. In case the MCA exceeds 63A, the wire diameters should be selected according
to the national wiring regulation.
2. Maximum allowable voltage range variation between phases is 2%.
3. Select circuit breaker that having a contact separation in all poles not less than 3 mm providing full disconnection
，
where MFA
is used to select the current circuit breakers and residual current operation breakers.
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