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2.4.3 PED category and maximum allowable pressure PS
The nameplate of the compressor contains information about the maximum allowable pressure PS,
the minimum and maximum allowed temperature TS, the internal free volume and the fluid groups
of the refrigerants qualified for the compressor model range. Values are given for the two existing
pressure ranges on low- and high-pressure sides.
PS
Compressor
Low-pressure
side
YB12K1E
23.5 bar(g)
YB17K1E
23.5 bar(g)
YB21K1E
23.5 bar(g)
YB24K1E
23.5 bar(g)
YB31K1E
23.5 bar(g)
YB36K1E
23.5 bar(g)
YB45K1E
23.5 bar(g)
Table 5: Maximum allowable pressures, temperatures and internal free volumes
The PED category is assigned according to the Pressure Equipment Directive PED 2014/68/EU.
Requirements apply to the relevant pressure levels in the compressor when the product of "pressure
relative to the environment" by "related internal free volume" (P x V) exceeds given limits. When
calculating the PED category, the high- and low-pressure sides have to be calculated separately.
The highest of the calculation results is considered.
Additionally, a distinction must be made between refrigerants of fluid group 1 (flammable) and fluid
group 2 (non-flammable). The YB*K1E compressors covered in these guidelines can be operated
with either A1 or A2L refrigerants. Consequently, identical compressor models may be subject to
different PED categories depending on the refrigerant used.
Compressor range
YB12K1E to YB45K1E
Table 6: PED category based on refrigerant used and fluid group
AGL_Ref_ST_YBK1E_EN_Rev03
PS
High-pressure
Low-pressure
side
38 bar(g)
38 bar(g)
38 bar(g)
38 bar(g)
38 bar(g)
38 bar(g)
38 bar(g)
Refrigerant
R454C, R455A, R454A,
R1234yf
R404A, R407A, R407F,
R448A, R449A, R407C,
R513A, R134a, R450A
TS max.
Internal free
volume
side
LP side (litres)
50 °C
4.1
50 °C
4.2
50 °C
4.3
50 °C
4.8
50 °C
6.4
50 °C
6.4
50 °C
6.4
Fluid group
PED category
1
2
Internal free
volume
HP side (litres)
0.5
0.5
0.5
0.5
0.6
0.6
0.6
II
I
5
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