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English
Installation Pr
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8
Check for gas leakage.
• At this time, especially check for gas leakage from
the 3-way valve’s stem nuts(A port), and from the
service port cap.
CAUTION
• Connect the indoor and outdoor units using pipes with
flared connections (not supplied). For the lines, use
insulated, unwelded, degreased and deoxidized copper
pipe, (Cu DHP type to ISO 1337 or UNI EN 12735-1), suitable
for operating pressures of at least 4200 kPa and for a burst
pressure of at least 20700 kPa. Copper pipe for hydro-
sanitary applications is completely unsuitable.
• For sizing and limits (height difference, line length, max.
bends, refrigerant charge, etc.) see “Connecting refrigerant
pipe section”.
Step 10 Adding refrigerant (R-32)
Precautions on adding the R-32 refrigerant
In addition to the conventional charging procedure, the
following requirements shall be kept.
• Make sure that contamination by other refrigerants
does not occur for charging.
• To minimize the amount of refrigerant, keep the hoses
and lines as short as possible.
• The cylinders shall be kept upright.
• Make sure that the refrigeration system is earthed
before charging.
• Label the system after charging, if necessary.
• Extreme care is required not to overcharge the system.
• Before recharging, the pressure shall be checked with
nitrogen blowing.
• After charging, check for leakage before
commissioning.
• Be sure to check for leakage before leaving the work
area.
• The outdoor unit is loaded with sufficient refrigerant for
the standard piping. Thus, refrigerant must be added
if the piping is lengthened. This operation can only
be performed by a qualified refrigeration specialist.
To determine the quantity of refrigerant charge, see
Calculating the quantity of refrigerant to add
on page
25
.
1
Check if the stop valve is closed completely.
2
Charge the refrigerant through the service port of the
liquid stop valve.
NOTE
• Do not charge the refrigerant through the service port
of the gas stop valve.
3
If you have any difficulty charging the refrigerant as
described in the steps above, take the following steps:
a
Open the liquid stop valve and gas stop valve.
b
Operate the air conditioner by pressing the K2 key on
the outdoor unit PCB.
c
After about 30 minutes, charge the refrigerant
through the service port of the gas stop valve.
Indoor Unit
Outdoor Unit
Liquid side stop valve(service port)
Gas side stop valve(service port)
Balance
Ref
Vacuum
pump
Important information: regulation regarding
the refrigerant used
This product contains fluorinated greenhouse gases. Do not
vent gases into the atmosphere.
CAUTION
• Inform user if the system contains 5 tCO2e or more
of fluorinated greenhouse gases. In this case, it must
be checked for leakage at least once every 12 months,
according to regulation No. 517/2014. This activity must be
covered by qualified personnel only.
• In the case of the situation above, the installer (or
authorized person with responsibility for final check) must
provide a maintenance book, with all the information
recorded, according to REGULATION (EU) No. 517/2014 OF
THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 16
April 2014 on fluorinated greenhouse gases.
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