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06/02/2008
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High-presssure pressostaat
The settings depend on the type of condensing unit and refrigerant being used. You always
HAVE TO
respect the values (indicated on the identification label) stated by the manufacturer of the cooling unit.
Basic values:
Type cooling unit
R22
R404A
R134a (R12)
Open
23
23
18
Hermetic
26
30.5
18
The differential is 5.5 bar.
Control of fan motor(s)
If the cooling unit is installed outside (ambient temperature + 5 °C for long periods) or connected to a
heat recovery system, the pressure of the refrigerant in the receiver tank
HAS TO
be kept above a certain
minimum. One of the methods which can be used is switching the condensor fans on and off by means of a
pressure switch or electronic fan speed controller connected to the
RECEIVER TANK
.
Set the following values (in kg/cm²):
R22
R404A
R134a(R12)
Fan
ON
OFF
ON
OFF
ON
OFF
1
14
12.5
17.5
16
10
8.5
2
15
13.5
18
16.5
11
9.5
