Troubleshooting guide

MAGNUM VERSION 8 MANUAL REVISION 3.1

7.8. Special Pattern for Scroll Compressors

Special patterns have been developed for Trane Scroll 3-D compressors. HVAC 7.00 software and newer

is required for this function. These patterns are for either a 3 or 4 scroll unit. They are specified by selecting

either the Trane Trio or Trane Quad package in the Compressor Type selection under the MAG V8 screen.

The sequencing will provide proper oil control for the Trane compressors.

The compressors set will be treated as one compressor. There will be one common suction pressure,

suction temperature, discharge pressure, and discharge temperature sensor for the package. Each

compressor will have an individual amperage sensor. These must be consecutive inputs.

Chiller states have been allocated for these patterns: “SCROLL STEP 1” through “SCROLL STEP 4”.

The following is a sample of the four-compressor setup:

7.8.1.

Select compressor type:

# of Compressors and # of steps:

Set up compressor:

Set up Relay Outputs:

Pattern of the four-compressor setup:

7.8.2.

Staging sequence

COMP A COMP B COMP C COMP D

Stage 1

ON OFF OFF OFF

Stage 2

OFF OFF ON ON

Stage 3

OFF ON ON ON

Stage 4

ON ON ON ON

The three-compressor type will be setup in as follows:

7.8.3.

Select the compressor: