Appendix 2-3 
 
2-3 Economizer 
As introduced in Appendix 1 Section 1-4, DX type and flash tank type economizers are available 
depending on the system and application.   
 
 
 
Figure app.2-2 
 
The DX type economizer  in Figure app.2-2 is indicating the shell and tube  type as a 
representative example. However, it is also possible to select the plate type heat exchanger and 
electronic type expansion valve according to the system and application. 
 
 
2-4 Protection Devices and Control Devices 
The protection devices and the control devices, e.g. various sensors  are required for the 
multi-package unit as well as the single-package unit.   
Install the protection devices  by considering the applicable regulations, applications, and 
maintenance. 
Please refer also to Chapter 1, Section 1.4 and Chapter 2, Section 2.3.3 in this manual.