Included in tandem or trio accessory kit
Figure 35: Example of right suction
Figure 36: Example of left suction
Tandem and trio requirements (Static)
Tandem and trio use static oil balancing principle to equalize oil level between the compressors by gravity. This is
ensured by a precise suction and oil equalization piping design.
The discharge line has no impact on oil balancing. It is shown with tee, to indicate that both left and right side
discharge headers are possible.
By default, DSH tandems and trios are not factory-built. To complete an assembly in the eld, you will need:
• Tubings, according to specic outline drawings indicated in the following table.
• Manifolding accessory kit.
• Compressors.
Suction and oil equalization piping drawings must be respected (diameters, minimum straight lengths, …)
Suction washer position
Depending on manifold conguration, it is essential to equalize the pressure of compressor sumps. Hence, a
suction washer must be added on certain compressors according to the table. Suction washers are included in
tandem or trio accessory kits as described in the illustrations.
Figure 34: Suction washer position
By convention, the compressor order (No.1, No.2 ...) is dened counting from left to right, placed on the side facing
the electrical boxes of the compressors (see example below on a trio)
Scroll compressors, DSH090 to DSH600 | Mechanical connections
© Danfoss | Climate Solutions | 2022.10 AB288965961751en-001402 | 32
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