Daikin EWYQ180DAYN [453/524] Part 3

ESIE06-05 Procedure for compressor replacement : Suction washer

Part 3 – Troubleshooting 3–53

Part 3

9 Procedure for compressor replacement : Suction

washer

9.1 Introduction

To maintain an equal oil level in 2 compressors, a suction washer is used (in some compressor setup).

Therefore it is very important that the right suction washer is used during a compressor replacement.

9.2 Use of Suction Washer

1) C/O unit When the two tandem compressors are unequal, a restrictor is mounted in the suction of the smallest

compressor in order to create a pressure drop in the suction and in such way, when the compressors

are in operation, maintain an equal oil level in the 2 compressors. Without this ring, the oil level would

be higher in the biggest compressor and in some conditions cause too low oil level in the smallest

compressor (especially applications with low LWE and high ambient).

Overview

2) H/P unit When the two tandem compressors are unequal, a restrictor is mounted in the suction of the smallest

compressor, also when the two tandem compressors are equal a restrictor is mounted in the

compressor that is closed to the 4-way valve (special piping is causing small pressure drop) in such

way, when the compressors are in operation, maintain an equal oil level in the 2 compressors. Without

the ring, the oil level would be higher in one of the compressors and in some conditions cause to low

oil level in the compressor that is close to the 4-way valve (especially applications with low LWE and

high ambient).

Overview

Cooling only unit Smallest compressor Biggest compressor

Equal compressors No suction washer needed.

Unequal compressors Suction washer installed. No suction washer installed.

Heatpump only unit Smallest compressor Biggest compressor

Equal compressors Suction washer needed in compressor that is closed to the

4-way valve

Unequal compressors Suction washer installed. No suction washer installed.