COMMISSIONING AND MAINTENANCE
23
3 COMMISSIONING AND MAINTENANCE
3.1
Preparation for first commissioning
Prior to commissioning, it is necessary to check that:
— all the safety conditions have been met
— the required distances have been respected
— the electrical connections have been properly completed
— the electrical power supply's values are correct
— the earthing has been carried out correctly
— all the connections have been properly tightened
— the shut-off valves are open
9
The device must always be powered electrically in order to
allow for the compressor's oil to be properly pre-heated.
If the device is installed in very cold areas, the device should
be under voltage for at least 12 hours before starting it up
for the first time.
ON
OFF
— set the system main switch to “ON”
3.2
Putting into service
After having completed all the operations required to prepare
for first commissioning, do the following to activate the device:
— follow the instructions given in the manual of the indoor
unit that you are installing
9
Keep the leak finder on and close to the unit so that it sig-
nals any refrigerant leak.
9
Use an electronic leak finder properly calibrated for the sys-
tem refrigerant.
0
It is forbidden to use leak finders with halogen lamps.
Checks during and after the first commissioning
After starting the device, check that:
— the current consumed by the compressor is less than the
maximum permitted
— the device is operating under the recommended operating
conditions
— the unit is able to stop and start up again
9
Should any of the above-listed controls have problems: turn
the device off and call the Technical Service immediately.
9
Do not touch the device pipes to prevent potential burns.
9
Take anti-static precautions in case of weather conditions
where humidity is less than 40%.
9
Avoid using mobile phones.
Additional refrigerant charge
The units are supplied with a sufficient amount of refrigerant gas
for a pre-set length of the connection pipes.
An additional refrigerant charge is needed if such length is ex-
ceeded.
The pre-set values are detailed in the following table:
Model 25 35 50 70
Maximum length with
standard charge
7 7 7 7 m
Additional charge 20 20 20 20 g/m
9
The device must be earthed before performing the addi-
tional charge.
To perform the additional charge:
A High pressure
B Low pressure
1 Pressure gauge unit
2 Electronic scale
3 3-way valve service connection
AB
1
R32
3
2
— connect the refrigerant cylinder to the pressure gauge unit
— connect the charging tube to the service connection on the
3-way shut-off valve
— remove the air from the charging tube
— charge the refrigerant with an electronic scale
— disconnect the charging tube from the service valve
— refit the three-way valve closing plug
9
Carefully check for absence of leakages from the closing
point of the plug.
9
Do not force beyond the stop point to prevent damaging the
shaft and causing leakage as a consequence.
9
Use equipment suitable for the system refrigerant.
9
Use only the system refrigerant.
9
Any gas leaks indoors can generate toxic gases if they come
into contact with naked flames or high temperature bodies,
in case of leaks, please air the rooms thoroughly.
9
Take anti-static precautions in case of weather conditions
where humidity is less than 40%.
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