10. System validation
a) Discharge pressures
After commissioning a Unicla compressor for the first time, some basic pressure and thermal
loading checks will determine if the operating environment for the compressor is within Unicla
specifications, and whether compressor durability is being maximised.
The following chart should be used as a guide for analysing normally acceptable high side (head
pressures) for given ambient . Allow 20% tolerance for humidity above 60% relative humidity.
b) Thermal loading
Excessive thermal loading is the enemy of the modern system, and is often misinterpreted as
being directly attributable to excess pressures. This is not the case.
Excess discharge temperatures may be pressure driven or may be superheated vapours generated
due to inadequate cooling vapour return to the compressor or excessive external thermal loads on
the suction line and/or the compressor.
It is important that all Unicla compressors are operated within a recommend heat range, and all
new applications must be physically tested to ensure this is adhered to.
The following chart shows normal superheat/discharge line temperatures taken from factory test
data. This gives a guideline of what to expect on the discharge line for each Unicla compressor, and
a ‘target’ to aim for
(marked in red)
in relation to the superheat component for each compressor.
9.
˚C
˚F
kPa
PSI
15˚C
60
600-800
90-115
18˚C
65
750-950
110-135
21˚C
70
900-1100
130-160
24˚C
75
1050-1300
155-190
27˚C
80
1200-1550
185-220
30˚C
85
1400-1750
200-250
33˚C
90
1500-1900
215-275
35˚C
95
1700-2100
245-300
38˚C
100
1850-2250
265-325
41˚C
105
2000-2400
290-350
44˚C
110
2250-2650
325-385
47˚C
115
2500-2900
370-420
High side pressure chart
