York YLAA0195HE, Manual, Page: 34 / 206

JOHNSON CONTROLS
34
FORM 150.72-NM3 (1020)
ISSUE DATE 10/05/2020
SECTION 2 – PRODUCT DESCRIPTION
FIG. 6 – PROCESS AND INSTRUMENTATION DIAGRAM
PROCESS AND INSTRUMENTATION DIAGRAM
Low pressure liquid refrigerant enters the cooler and is
evaporated and superheated by the heat energy
absorbed from the chilled liquid passing through the
cooler shell. Low pressure vapour enters the
compressor where pressure and superheat are
increased. The high pressure vapour is fed to the air
cooled condenser coil and fans where the heat is
removed. The fully condensed and subcooled liquid
passes through the expansion valve where pressure is
reduced and further cooling takes place before
returning to the cooler.
PS
ZCPR-1 ZCPR-2
ZCPR-3
DV
HPL
HPC
P
DV
LPC
P
Condenser
Fans Fans
-YLLSV
S
Chilled
Liquid
T
DV
CHT
LTC
Evaporator
Chilled
Liquid
See P.R.V.
Options
Compressors
Control Functions:
DV - Display Value
CHT - Chilled Liquid Temperature
HPC - High Pressure Cutout
LPC - Low Pressure Cutout
HPL - High Pressure Load Limiting
LTC - Low Temperature Cutout
Components:
Pressure Relief Valve
Service (Ball) Valve
Expansion Valve
Solenoid Valve
Sight Glass
Sensor Pressure
or Temperature
Service (Stop) Access Valve
Pressure Switch
Filter Drier
(Removable Core)
S
PS
T
Ambient Air Sensor
DV
HTC
LTC
585 PSIG
650 PSIG
450 PSIG
LD13139
Low pressure liquid refrigerant enters the cooler and is
evaporated and superheated by the heat energy absorbed
from the chilled liquid passing through the cooler
shell. Low pressure vapor enters the compressor where
pressure and superheat are increased. The high pressure
vapor is fed to the air cooled condenser coil and fans
where the heat is removed. The fully condensed and
subcooled liquid passes through the expansion valve
where pressure is reduced and further cooling takes
place before returning to the cooler.