Technical information

Cooling operation and hydraulic diagram YLHA 100, 120 and 150 (heat pump)

Safety/Control devices Components

A High-pressure switch 1 Tandem compressor 15 Water tank

B Low-pressure switch 2 Air-cooled condenser 16 Charge valve

Pressure transducer port. (Fan

speed setting ‑ condensing

pressure display)

3 Filter dryer 17 Drain valve

Water outlet temp. sensor (An‐

tifreeze and display)

4 Sight glass 18

Water filter (not inside the

unit)

Water inlet temp. sensor (Set‐

ting and display)

5 Expansion valve 19 Safety valve

6 Plate heat exchanger 20 Water pressure gauge

Heat exchanger antifreeze heat‐

21 Flow switch

8 Globe valve 22 Check valve

9 Four-way valve 23 Suction acumulator

10 Liquid receiver →

Pipe connection with

"Schrader" valve

11 Water pump - ‑ ‑ For units with hydro kit only

12 Automatic air bleed a Water inlet

13 Water tank antifreeze heater b Water outlet

14 Expansion vessel c Circuit 1

d Circuit 2

Technical Information 1

Cooling operation and hydraulic diagrams 1.10