Figure 12: Single compressor with rubber grommets
1
CC
-0
00
00
01
Figure 13: Rubber grommets
27
.5
m
m
(1
.0
8
in
ch
)
CC-0049
2
8
3
4
5
6
7
1
2
3
4
5
6
7
8
Rubber grommets
HM 8 bolt
Lock washer
Flat washer
Steel mounting sleeve
Rubber grommet
Nut
Compressor base plate
Design piping
General requirements
Successful application of scroll compressors is dependent on careful selection of the compressor for the application.
If the compressor is not correct for the system, it will operate beyond the limits given in this manual. Poor
performance, reduced reliability, or both may result.
Essential piping design recommendations
The working pressure in systems with R410A is about 60% higher than in systems with R22 or R407C. Consequently,
all system components and piping must be designed for this higher pressure level.
Proper piping practices should be employed to ensure adequate oil return, even under minimum load conditions
with special consideration given to the size and slope of the tubing coming from the evaporator. Tubing returns
from the evaporator should be designed so as not to trap oil and to prevent oil and refrigerant migration back to the
compressor during off-cycles.
In systems with R410A, the refrigerant mass flow will be lower compared to R22/R407C systems. To maintain
acceptable pressure drops and acceptable minimum gas velocities, the refrigerant piping must be reduced in size
compared to R22 / R407C systems. Take care not to create too high pressure drops since in R410A systems the
negative impact of high pressure drops on the system efficiency is stronger than in R22/R407C systems.
Piping should be designed with adequate three-dimensional flexibility. It should not be in contact with the
surrounding structure, unless a proper tubing mount has been installed. This protection proves necessary to avoid
excess vibration, which can ultimately result in connection or tube failure due to fatigue or wear from abrasion.
Aside from tubing and connection damage, excess vibration may be transmitted to the surrounding structure and
generate an unacceptable noise level within that structure as well. For more information on noise and vibration, see
the section on: “Sound and vibration management”.
© Danfoss | Climate Solutions | 2022.09
AB236986442743en-000501 | 21
Scroll compressors, CH290 and CH485 | Mechanical connections