M-thermal technical manual
– part 3
1
Pre-test and test running
1.1 Checks before initial start-up
Warning: Switch off the power supply before making any connections.
After the installation of the unit, check the following before switching on the circuit
breaker:
A. Field wiring
Make sure that the field wiring between local supply panel and indoor unit, outdoor unit and
indoor unit, indoor unit and valves (when applicable), indoor unit and room thermostat (when
applicable), and indoor unit and sanitary hot water tank has been connected correctly.
The wiring
diagrams should be according to European and national regulations.
B. Fuses or protection devices
Check that the fuses or the locally installed protection devices are of the right size and type.
Make sure that neither a fuse nor a protection device has been bypassed.
C. Electric heater circuit breaker
Do not forget to turn on the electric heater circuit breaker in the control box (applies only to units
with optional sanitary hot water tank installed).
D. Earth wiring
Make sure that the earth wires have been connected properly and that the earth terminals are
tightened.
E. Internal wiring
Visually check the control box on loose connections or damaged electrical components.
F. Fixation
Check that the unit is properly fixed, to avoid abnormal noises and vibrations when starting up the
unit.
G. Damaged equipment
Check the inside of the unit on damaged components or squeezed pipes.
H. Refrigerant leak
Check the inside of the unit on refrigerant leakage. If there is a refrigerant leak, call your local
dealer.
I. 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.
J. Air purge valve
Make sure the air purge valve is open (at least 2 turns).
K. Pressure relief valve
Check if the auxiliary heater vessel is completely filled with water by operating the pressure relief
valves. It should purge water instead of air.
L. Shut-off valves
Make sure that the shut-off valves are correctly installed and fully open
.
Before switch on the unit, read following recommendations:
■
When the complete installation and all necessary settings have been carried out, close all front
panels of the unit and refit the indoor unit cover.
■
The service panel of the control box may only be opened by a licensed electrician for
maintenance purposes.
