Introduction - Bitzer KT-600-4 Manual Del Usuario

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Introduction

In parallel compounding, several compressors are combined in a common refrigerant circuit. The systems are often
complex and have special requirements, in particular with respect to oil return, oil distribution between compressors
and system control. This is why this document includes important information for planning and execution. In addi-
tion, system-related criteria and special manufacturer specifications related to additional components (e.g. oil sep-
arators, oil level controllers) have to be taken into account, making it necessary to adjust design and accessories, if
required.
Furthermore, the recognized technical rules and the current safety regulations must be observed.
Refrigerant
This document considers compound systems with HFC and HFO refrigerants and R744. For compound systems
with R717 (NH ), see Technical Information AT-640 .
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Also observe the following technical documents
KB-104 : Operating Instructions semi-hermetic reciprocating compressors BITZER ECOLINE and
ECOLINE VARISPEED
KB-120 : Operating Instructions semi-hermetic reciprocating compressors for subcritical R744 applications
KB-130 : Operating Instructions semi-hermetic reciprocating compressors for transcritical R744 applications
KB-150 : Operating Instructions reciprocating compressors – supplement "2-stage"
KB-520 : Operating Instructions open drive reciprocating compressors
CB-110 : Operating Instructions VARIPACK – external BITZER frequency inverters
AT-640 : Technical Information on the use of R717 in BITZER compressors
Advantages of parallel compounding
The aspects for or against parallel compounding are too different for a general evaluation ‒ however, there are a
series of advantageous features:
• Optimum power adjustment to the demand, in particular in case of additional capacity control of the compressors
(CRII system or frequency inverter)
• Low power supply load during start by stepwise switch-on of the compressors
• Upon failure of a compressor or frequency inverter, system operation can be initially maintained
• Easier and lower-cost pipe installation for widely branched systems compared with separate refrigerant circuits
KT-600-4 // PDF Download 28