Emerson Copeland YHV072RG-4X9 - Qualified Refrigerants and Oils; Operating Envelopes and Application Limits; Installation; Compressor and Drive Handling

AGL_HP_VS_YHV_RG_RT_EN_Rev00 7
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 from Copeland scroll compressors brochures or Copeland Select
sof tware available at
www.climate.emerson.com/en-gb.
Compressors YHV*RG YHV*RT
Qualified refrigerants R290 R454C
Qualified
oil
s
(
factory
charged)
PAG POE: 4MA
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 s
croll
compressors are qualified for operation inside the envelope published by
Emerson. The envelope is defined according to Emerson
testing and
experience. Operating a compressor outside the envelo
pe might lead to
compressor failure 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 refrigerant 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
for 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 information about application envelopes and technical data, please refer 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 left 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 protection". The temperature sensor must signal the
drive or system unit controller to shut down if the discharge line temperature exceeds the specified
temperature on the operating envelope.