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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 9.6 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 the chapter 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.
10.5 Powering up the unit
When power to the unit is turned on, "1%~99%" is displayed on the user interface during initialization. During this process the
user interface cannot be operated.
10.6 Setting the pump speed
The pump speed can be selected by adjusting the red knob on the pump. The notch point indicates
pump speed.
The default setting is the highest speed (III). If the water flow in the system is too high the speed can
be set to low (I).
The available external static pressure function for water flow is shown in the graph below.
Available external static pressure VS flowrate (5/7/9kW)
70
60
50
40
30
20
10
0
0.3
0.5
DANGER
0.7
0.9
1.1
1.3
Flowrate(m3/h)
143
1.5
1.7
1.9
2.1
Ⅲ
Ⅱ
Ⅰ
2.3
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