Plant diagram

Figure: 2-stage heat pump with internal reversing valve control and hot gas reheater

Key:

DXR2…

Automation station

 

Q1

Fan

D1

Presence

 

R1

Room operator unit

D2

Window contact

 

YR

Electric reheater

HP

Heat pump

 

 

 

Sequences

 

Y

Output signal heat pump

 

TR

Room temperature

SpH

Effective heating setpoint

 

SpC

Effective cooling setpoint

YH

Heat pump heating

 

YC

Heat pump cooling

YH1

Heat pump heating, first stage

 

YC1

Heat pump cooling, second stage

YH2

Heat pump heating, second stage

 

YC2

Heat pump cooling, second stage

Figure: 2-stage heating and cooling sequence