Doc: 70-00-0792B V1.3, 20220830  © Vector Controls GmbH, Switzerland   Page 18-34 
Subject to change without notice   www.vectorcontrols.com 
5.6.2  Application modes: Valve control diagrams 
Detailed explanation of Comfort and Economy temperature set points are given in chapter 5.7 Set points, page 22. 
Detailed explanation of on/off or 3-position valve control are given in chapter 5.8 Control settings, page 24. 
Detailed explanation of auto heat/cool changeover are given in chapter 5.9 Temperature and digital inputs, page 27. 
 
Valve control diagram (comfort mode) 
2-pipe system 
Heating only 
2-pipe system 
Cooling only 
2-pipe system 
manual heating or cooling 
4-pipe system 
manual heating or cooling 
2-pipe system 
auto heat/cool changeover 
4-pipe system 
auto heat/cool changeover 
4-pipe system 
Heating and cooling