York YLCC-H Technical Information page 54

Operation
Summer cycle diagram for YLCC
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The units are made up of two circuits, with common water connections.
Summer cycle YLCC
The heat exchanger for water acts as an evaporating unit,
while the finned coil acts as a condensing unit. The summer
cycle diagram indicates the circuit followed by the refriger-
ant.
Heat exchange takes place between the heat transmitting
liquid (water or water and glycol) and the refrigerant in the
coaxial heat exchanger. The water is cooled and evaporates,
and the refrigerant is reheated. Then the Scroll type com-
pressor condenses the refrigerant (gas) until the condensing
pressure is reached, which then goes on to the air cooled
condensing unit. In the air cooled condensing unit, heat ex-
change takes place between the air and the refrigerant. The
air is heated and removed from the chiller (heat rejection). The
refrigerant is condensed and subcooled. Then the refrigerant
(liquid) goes on to the expansion valve where it is expanded
until the evaporating pressure is reached, and then goes on
to evaporating unit to begin a new cooling cycle.
Cooling cycle YLCC-H
The 4-way valve is not activated. Heat exchange takes place
between the heat transmitting liquid (water or water and
glycol) and the refrigerant in the coaxial heat exchanger.
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The water is cooled and evaporates, and the refrigerant is
reheated. Then the Scroll type compressor condenses the
refrigerant (gas) until the condensing pressure is reached,
which then goes on to the air cooled condensing unit. In the air
cooled condensing unit, heat exchange takes place between
the air and the refrigerant. The air is heated and removed
from the chiller (heat rejection). The refrigerant is condensed
and subcooled. Then the refrigerant (liquid) goes on to the
expansion valve where it is expanded until the evaporating
pressure is reached, and then goes on to evaporating unit
to begin a new cooling cycle.
Heating cycle YLCC-H
This cycle is inverted in heating mode. The 4-way valve is
activated. The condensing unit becomes the evaporating unit,
and the evaporating unit becomes the condensing unit. The
water is heated in the coaxial heat exchanger.
Defrost
When the probe detects a temperature below 0.5° C (factory-
set freezing point), this cycle is inverted. The defrost cycle is
activated for a maximum of 4 minutes. If, during this period of
time, the temperature rises to over +6° C, the defrost cycle
is deactivated.
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