Application Considerations; Qualified Refrigerants And Oils; Application Limits Operating Envelopes - Emerson Copeland YHV029RG Application Manuallines

2.6

Application considerations

2.6.1 Qualified refrigerants and oils

IMPORTANT
It is essential that the glide of the refrigerant blends be carefully considered
when adjusting pressure and superheat controls.
Oil recharge values can be taken f rom Copeland scroll compressors brochures or Copeland Select
sof tware available at www.climate.emerson.com/en-gb.
Compressors
Qualified refrigerants
Qualified oils (factory
charged)
Table 4: Qualified refrigerants and oils
NOTE: R290 is classified as A3 (flammable) refrigerant, while R454C is classified as A2L
(mildly flammable) refrigerant.

2.6.2 Application limits Operating envelopes

CAUTION
Inadequate lubrication! Compressor breakdown! Copeland scroll
compressors are qualif ied f or operation inside the envelope published by
Emerson. The envelope is def ined according to Emerson
experience. Operating a compressor outside the envelo pe might lead to
compressor f ailure which would be the
responsibility.
CAUTION
Low superheat! Liquid floodback and compressor breakdown! The
superheat at the compressor suction inlet must always be sufficient to ensure
that no ref rigerant droplets enter the compressor. For a typical evaporator-
expansion valve configuration a minimum stable superheat of at least 5 K is
required. In Emerson solution in combination with SEC-Mono also 0 K
superheat is under qualification. Target is a minimum vapour quality of 97 %.
In the same way, the superheat at the compressor suction must always stay
below a maximum limit specified by Emerson, depending on the model and
f or which the operating envelope is defined.
The operating envelopes of the YHV*RG/RT compressors depend on the running speed. The
envelope limitations are mainly related to lubrication and drive power limitation.
For more inf ormation about application envelopes and technical data, please ref er to Copeland
Select software available at www.climate.emerson.com/en-gb.
The lower right boundary of the operating envelope is the minimum compression ratio required to keep
the scrolls loaded. Operation below this limit could result in the compressor intermittently loading
and unloading and noisy operation.
The upper lef t boundary of the envelope represents the maximum compression ratio. If the operating
condition approaches this limit the compressor discharge temperature will begin to approach the
maximum scroll temperature allowed by the discharge line temperature sensor please see details
in section 3.7 "Discharge gas temperature
drive or system unit controller to shut down if the discharge line temperature exceeds the specified
temperature on the operating envelope.
AGL_HP_VS_YHV_RG_RT_EN_Rev00
YHV*RG
R290
PAG
protection". The temperature sensor must signal the
YHV*RT
R454C
POE: 4MA
testing and
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