53
77 RREEFFRRIIGGEERRAATTIINNGG CCO
ONNNNEECCTTIIO
ONNSS
11
Gas line
22
Liquid line
After having completed the refrigerating connections the sealing of the
refrigerating circuit must be checked:
•
maintain close the indoor unit cocks 11 and 22
•
connect pipes DD and HH to cocks 11 and 22
•
close cocks AA, BB, CC and II
•
connect EE to the nitrogen cylinder
•
open cocks CC and II
•
perform the tightness test
•
M
Mooddee 11:: open cock BB, pressurize the circuit up to 45 bar (see
the label) and wait few hours.
M
Mooddee 22:: open cock BB, pressurize the circuit up to 65 bar (as
according to UNI-EN 378-2 2009:PS x 1,43 law)
•
spray using a leak detector spray cocks and pipes and check if bub-
bles are present (gas leaks)
•
if everything is OK, proceed
•
discharge the nitrogen from the unit
•
connect FF to the vacuum pump
•
open cocks AA,, CC and II
•
start the vacuum pump
•
in optimal conditions, 15-60 minutes are required to create the va-
cuum. In the event of high moisture content in the piping or the tem-
perature is < 20 °C, a few hours may be required
•
reach the lowest value (approximately 1 mbar = 100 Pa.)
•
close cock AA
•
turn off the pump
•
overlap the red pointer of the vacuum gauge to the black one
•
check the vacuum gauge to ensure that the pressure does not rise,
for a few minutes
•
if it rises, repeat the procedure
•
if everything is OK, proceed
•
connect EE to the coolant cylinder
•
open cock BB to charge the coolant (see table "additional energy ex-
changer charge)
•
close cocks BB, CC and II
•
disconnect pipes DD and HH and cocks 11 and 22
88 EELLEECCTTRRIICCAALL CCO
ONNNNEECCTTIIO
ONNSS
The characteristics of the lines must be determined by specialized
personnel able to design electrical installations in compliance with
regulations in force.
The protective equipment of the unit supply line must be able to
shut-off the presumed short circuit current, which value must be
determined in accordance with the system features.
The power cable and protection cable section must be defined in
accordance with the characteristics of the protections adopted.
All electrical operations should be performed by trained personnel
having the requirements envisaged by the regulations in force and
informed about the risks relevant to these activities.
Operate in compliance with safety regulations in force.
EElleeccttrriicc ddaattaa
The serial number label reports the unit's specific electrical data,
electrical accessories included.
The electrical data indicated in the technical bulletin and in the
manual refer to the standard unit, accessories excluded.
The label reports the indications envisaged by regulations, in
particular:
Voltage
F.L.A.: full load ampere, absorbed current at maximum admitted
conditions
F.L.I.: full load input, full load power input at max. admissible
condition
Electrical wiring diagram No.
CCoonnnneeccttiioonnss
Refer to the unit
’
s electrical diagram (the number of the diagram
is shown on the serial number label)
Verify that the electrical supply has characteristics conforming to
the data shown on the serial number label.
Before starting work, ensure the unit is isolated, unable to be
turned on and a safety sign used.
Ensure correct earth connection.
Ensure cables are suitably protected.
Before powering the unit, make sure that all the protections that
were removed during the electrical connection work have been
restored.
This unit is required reliable earthing
before usage, otherwise might cause
death or injury.
eLectRicaL connectionS
9. ELECTRICAL CONNECTIONS
