52
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
RefRigeRating connectionS
