Section 25 • Cool Compression Control

enable Superheat Monitoring on the screen.

As previously described, Cool Compression compressor does not have an oil pump. Instead it has a suction oil injection solenoid to pro- vide oil and liquid ammonia for lubrication and cooling.

Cool Compression liquid injection 1 and liq- uid injection 2 outputs will operate as high / low pressure ratio solenoid outputs.

Control Functions

In the Compressor Control Menu, special cool compres- sion control functions are now available, see Figure 25-2. Cool Compression Control Functions Screen. These new functions are:

• Auto Load

Suction Oil Injection Settings

Danfoss Positioning Valve Settings

Auto Load

Auto load operation will force the compressor to load to a minimum value once the compressor has started. By loading the compressor to a minimum value, and maintaining this capacity, a pressure ratio is created across the compressor, to ensure adequate lubrication of the compressor, and also that the com- pressor does not experience high discharge super- heat conditions. Since compressor lubrication is of great importance, all load limiting is disabled when auto load is engaged.

Auto Load at Start

Defines the value at which Compressor (ca- pacity slide) should be loaded (and maintained) at start if Auto Load is enabled.

Figure 25-2. Cool Compression Control Functions Screen

25 – 2

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Emerson 20/20 service manual Cool Compression Control Functions Screen

20/20 specifications

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