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Evacuation of the refrigeration circuit and charging of
refrigerant
WARNING! The charging and maintenance of
the refrigeration circuit must only be carried out
by a qualified hydraulic technician.
The refrigeration circuit is pre-charged with nitrogen.
To load the refrigerant, carry out the following procedure:
R410A
•
open any shut-off valves present in the machine to ensure
that all of the components will be evacuated;
•
connect a pump to empty the schrader connections
efficiently, or to the 1/4" SAE connections present on
the intake and delivery sides of the compressors;
•
connect the refrigerant cylinder to the loading
connections;
•
create a vacuum within the lines whilst maintaining the
pressure below 10 Pa absolute (0,07 mm Hg) for a long
time in order to evacuate the air as well as any trace of
humidity. It is preferable that the vacuum is reached
slowly and maintained for a long period of time;
•
wait for a build up period of 100 seconds and check that
the pressure has not exceeded 200 Pa absolute.
Generally, in the case of suspicion of strong hydration of
the circuit or an extremely extensive system, it will be
necessary to break the vacuum with anhydrous nitrogen
and then repeat the evacuation procedure as described;
•
break the vacuum by performing a preload in liquid phase
from the R410A coolant cylinder;
•
after having started the compressor, slowly complete the
loading phase until the pressure within the lines has been
stabilised and the gaseous bubbles have disappeared
from the flow sight glass;
•
the loading process must be controlled in environmental
conditions with a delivery pressure of approximately 18
bar (equivalent to a dew temperature of 48 °C and a bubble
temperature of 43 °C). It is wise to check that the sub-
cooling of the liquid at the entry of the thermostatic valve
is between 3 and 5 °C below the condensation tempera-
ture read on the scale of the pressure gauge and that
the overheating of the vapour at the exit of the evaporator
is equal to approximately 5-8 °C.
Type of oil recommended with COPELAND
compressors
C
R
4
1
0
A
P (
O
) E
I
M
Type of oil recommended with DANFOSS-
MANEUROP compressors
R
4
1
0
A
P (
V
) E
D
22
O
P
E
L
A
N
D
3
M
A
3 (
2
c
S
I C
E
m
k
a
a r
e t
R
L
3
2
C
F
o
l i b
E
A
L
A
c r
c i t
2
2
C
C
A
P
H
N
E
P
V
E
F
V
C
6
8
D
Connection for water cooled units
WARNING! The laying of the lines and hydraulic
connections must only be carried out by a
qualified plumber.
WARNING! The chilled water must contain a
percentage of ethylene glycol (of the passive
type, which is therefore not corrosive) according
to the minimal external temperature predicted
(see the table below).
P
e
c r
e
n
a t
g
e
f o
e
F
e r
e
z
n i
g
e t
m
p
e
If the temperature of the chilled water is not checked it may
fall to under 25°C, therefore it is necessary to use a
pressostatic valve (available as an optional) for each
condenser; in this case the pressure of the supply must not
be less then 200 kPa (2 bar).
WARNING! Do not use chilled water with an
evaporating tower because the condensers will
quickly become encrusted with limescale.
The condenser must be connected to the chilled water
distribution network, paying attention to the direction of the
water inlet and outlet.
The condensers are supplied by water pumped in a closed
circuit and chilled by external refrigerators; check that the
section of piping and the characteristics of the circulation
pump are suitable: an insufficient flow of water can have a
negative effect on the capacity of the conditioner.
If the water temperature falls to below the dew point of the air
conditioner, isolate the piping with closed cell material (e.g.:
Armaflex or equivalent) to avoid condensation; the isolation
must allow the accessibility of the valves and the three piece
joints. Seal the piping holes through the base of the conditioner
to avoid a bypass of air.
WARNING! The water cooled pressure must not
be above 6 bar.
Table of condenser fitting dimensions
SDW*-SUW*
Ingresso acqua
condensatore
Uscita acqua
condensatore
) t
H
G8
Once the connections have been made to the hydraulic circuit,
the system can be filled.
h t
y
e l
n
e
g
y l
c
l o
1
0
%
2
0
%
a r
u t
e r
-
° 4
C
1 -
° 0
0151-0251
1/2"
1/2"
G11
G G3
H1
3
0
%
4
0
%
5
0
%
C
1 -
° 7
C
2 -
° 5
C
3 -
° 7
C
0331-0351-0501-0601
1"
1"
G2
G10
G1
G9
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