Technical information

Cooling operation and hydraulic diagram YLHA 40 (heat pump)

Safety/Control devices Components

A High-pressure switch 1 Compressor 13 Expansion vessel

B Low-pressure switch 2 Air-cooled condenser 14 Safety valve

Pressure transducer port. Fan

speed setting, defrost man‐

agement, condensing pres‐

sure display (cooling cycle) or

evaporating pressure display

(heating cycle)

3 Filter dryer 15 Water pump

Water outlet temp. sensor (An‐

tifreeze, setting and display)

4 Sight glass 16 Flow switch

Water inlet temp. sensor (Set‐

ting and display)

5 Expansion valve 17 Drain connection

6 Plate heat exchanger 18

Water filter (not inside the

unit)

Heat exchanger antifreeze heat‐

19 Suction acumulator

8 Globe valve →

Pipe connection with

"Schrader" valve

9 Four-way valve - ‑ ‑ For units with hydro kit only

10 Check valve a Water inlet

11 Liquid receiver b Water outlet

12 Automatic air bleed

Technical Information 1

Cooling operation and hydraulic diagrams 1.10