12
Operation, cooling and hydraulic diagram, cool only unit YLCA
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 compressor condenses the
refrigerant (gas) until the condensing 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.
SAFETY/CONTROL DEVICES
A
High pressure switch
B
Low pressure switch
C
Pressure transducer port (LAK YLCA
5 to 15)
Pressure sensor. Pressure reading.
Fan speed setting (YLCA 20, 27)
D
Coil temperature sensor. Temperature
reading and fan speed setting (YLCA
5 to 15)
E
Water outlet temperature sensor
(antifreeze and display)
F
Water intake temperature sensor
(Setting and display)
COMPONENTS
1
Compressor
2
Air cooled condenser
3
Filter dryer
4
Sight glass (YLCA 20, 27)
5
Expansion valve
6
Plate heat exchanger
7
Flow switch
8
Globe valve (YLCA 27)
9
Water pump
10
Automatic air bleed
11
Expansion vessel
12
Drain connection
13
Water filter (not inside the unit)
14
Relief valve
Pipe connection with Schrader valve
For units with hydro kit only
D
P
A
P
B
1
8
8
P
C
5
4
6
2
3
YLCA-20. 27 (TEV)
YLCA-5 to 15 (RESTRICTOR)
7
12
11
10
F
WATER
OUTLET
WATER
INTAKE
E
14
9
13
5
