Airwell PAC BT Series, Installation And Operating Manual

Page: 23 / 112

21
4 - REFRIGERATING CONNECTIONS

connect
E
to the coolant cylinder

open cock
B
to charge the coolant (see table "additional
energy exchanger charge)

close cocks
B
,
C
and
I

disconnect pipes
D
and
H
and cocks
1
and
2
A VAC
vacuum gauge cock
B REF
refrigerant cock
C HIGH
high pressure cock
D
liquid high pressure pump
E
Refrigerant pipe
F
Vacuum pump pipe
H
Low pressure pipe
I LOW
low pressure cock
After having completed the refrigerating connections the
sealing of the refrigerating circuit must be checked:

maintain close the indoor unit cocks
1
and
2

connect pipes
D
and
H
to cocks
1
and
2

close cocks
A
,
B
,
C
and
I

connect
E
to the nitrogen cylinder

open cocks
C
and
I

perform the tightness test
Mode 1:
open cock
B
, pressurize the circuit up to 45
bar (see the label) and wait few hours.
Mode 2:
open cock
B
, 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 bubbles are present (gas leaks)

if everything is OK, proceed

discharge the nitrogen from the unit

connect
F
to the vacuum pump

open cocks
A, C
and
I

start the vacuum pump

in optimal conditions, 15-60 minutes are required to create
the vacuum. In the event of high moisture content in the
piping or the temperature is < 20 °C, a few hours may be
required

reach the lowest value (approximately 1 mbar = 100 Pa.)

close cock
A

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
1
2
1
2
1
2
R410A
A
B
C
D E F H
I