York YLCA Series, Техническая информация

Страница: 10 / 68

10
Cooling cycle
The 4-way valve is activated. Heat exchange takes place
between the heat transfer liquid (water or glycol water) and
the refrigerant in the plate heat exchanger. Water is cooled,
and refrigerant is evaporated and reheated. Then the Scroll
type compressor condenses the refrigerant (gas) until the con-
densing pressure is reached, and the refrigerant goes to the
air cooled condensing unit. In the air cooled condensing unit,
heat is exchanged between the air and the refrigerant. The air
is heated and evacuated from the chiller (heat rejection). The
refrigerant is condensed and sub-cooled. Then the refrigerant
(liquid) goes on to the expansion valve, where it is expanded
until the evaporating pressure is reached, at which time it goes
to the evaporating unit to start a new cooling cycle.
Heating cycle
The cycle is reversed to heating mode. The 4-way valve is
not activated. The condensing unit becomes the evaporating
unit, and the evaporating unit becomes the condensing unit.
The water in the heat exchanger is heated.
Operation, cooling and hydraulic diagram, heat pump unit YLHA PLUS 5 to 15
SAFETY/CONTROL DEVICES
A High pressure switch
B
Low pressure switch
C Pressure transducer port
E Condensing unit temp. sensor (fan
speed setting, defrosts and display)
F Water outlet temperature sensor
(antifreeze and display)
G Water intake temperature sensor
(Setting and display)
COMPONENTS
1
Compressor
2 Air cooled condenser
3 Filter dryer
4
Expansion valve
5 Water pump
6 Plate heat exchanger
7
Automatic air bleed
8 Expansion vessel
9 Four-way valve
10 Liquid receiver
11 Drain connection
12
Water filter (not inside the unit)
13 Relief valve
14 Flow switch
Pipe connection with Schrader valve
For units with hydro kit only
E
3
4
4
2
9
ON
P
1
A
B
P
10
6
14
11
8 7
13
5
12
P C
E
WATER
INTAKE
WATER
OUTLET
F