C6.2.38/0719/E
7
Figure 5: R290 oil dilution chart (tb = bottom shell temp.; te = evaporating temp.)
2.6.5 Admissible pressure, temperature and relative humidity ranges
The pressure PS is the maximum allowable pressure at the low- and high-pressure sides of the
compressor. Safety is established in compliance with the relevant standards applicable to the given
product.
Compressor
model
PS
(low-pressure side)
PS
(high-pressure side)
YBVH021
16.5 bar(g)
28 bar(g)
YBVH029
16.5 bar(g)
28 bar(g)
YBVH046
16.5 bar(g)
28 bar(g)
Table 4: Maximum allowable pressures
The scroll compressor must comply with the ambient temperature and humidity ranges specified in
Table 5
below, both for storage and in operation.
Compressor
Compressor
model
Min / max
relative
humidity
Min / max ambient
temperatures in
storage or at standstill
Min / max ambient
temperatures in
operation
YBVH*
30 / 95%
No condensing
-30°C / 50°C
-30°C / 60°C
Table 5: Allowable ambient temperature and humidity ranges for the compressor
2.6.6 Application limits
– Operating envelope
CAUTION
Inadequate lubrication! Compressor breakdown!
Copeland scroll
compressors are qualified for operation inside the envelope published by
Emerson. The envelope is defined according to Emerson
’s testing and
experience. Operating a compressor outside the envelope might lead to
compressor failure which would be the system design
er’s responsibility. 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 10K is
required. 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 YBVH* compressors operating envelope is shown in
Figure 6
.