Ylha Plus Models: Heat Pump - York YLCA Technical Information

1.10.2 YLHA PLUS models: heat pump

Cooling cycle
1 The 4-way valve is activated.
2 Heat exchange takes place between the heat transfer liquid (water or glycol water) and the coolant
in the plate heat exchanger. Water is cooled, and coolant is evaporated and reheated.
3 Then the Scroll-type compressor condenses the coolant (gas) until the condensing pressure is
reached, and the coolant goes to the air cooled condenser unit.
4 In the air cooled condenser unit, heat is exchanged between the air and the coolant. The air is heated
and evacuated from the cooling unit (heat rejection).
5 The coolant is condensed and sub-cooled.
6 Then the coolant (liquid) goes on to the expansion element where it is expanded until the evaporation
pressure is reached, next it goes to the plate heat exchanger to start a new cooling cycle.
Heating cycle
The cycle is reversed to heating mode. The 4-way valve is not activated. The condenser unit becomes
the evaporator and the evaporator becomes the condenser. The water in the plate heat exchanger is
heated.
Technical Information
Cooling operation and hydraulic diagrams 1.10
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