50
Checks before initial start-up.
10.3 Pre-operation checks
DANGER
Switch off the power supply before making any connections.
After the installation of the unit, check the following before switching on the circuit breaker:
Field wiring
：
Make sure that the field wiring between the local supply panel and unit and valves (when applicable),
unit and room thermostat (when applicable), unit and domestic hot water tank, and unit and backup heater kit have
been connected according to the instructions described in the chapter 9.7 "Field wiring", according to the wiring
diagrams and to local laws and regulations.
Fuses, circuit breakers, or protection devices Check that the fuses or the locally installed protection devices are of
the size and type specified in 14 "Technical specifications". Make sure that no fuses or protection devices have
been bypassed.
Backup heater circuit breaker
：
Do not forget to turn on the backup heater circuit breaker in the switchbox (it
depends on the backup heater type). Refer to the wiring diagram.
Booster heater circuit breaker
：
Do not forget to turn on the booster heater circuit breaker (applies only to units with
optional domestic hot water tank installed).
Ground wiring
：
Make sure that the ground wires have been connected properly and that the ground terminals are
tightened.
Internal wiring
：
Visually check the switch box for loose connections or damaged electrical components.
Mounting
：
Check that the unit is properly mounted, to avoid abnormal noises and vibrations when starting up the unit.
Damaged equipment
：
Check the inside of the unit for damaged components or squeezed pipes.
Refrigerant leak
：
Check the inside of the unit for refrigerant leakage. If there is a refrigerant leak, call your local dealer.
Power supply voltage
：
Check the power supply voltage on the local supply panel. The voltage must correspond to the voltage
on the identification label of the unit.
Air purge valve
：
Make sure the air purge valve is open (at least 2 turns).
Shut-off valves
：
Make sure that the shut-off valves are fully open.
The relationships between the head and the water flow rated,the PMW Return and the water flow
rated are shown in the graph below.
10.4 The circulation pump
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