Process And Instrumentation Diagram; Fig. 6 - Process And Instrumentation Diagram - York YLAA0285SE Manual

SECTION 2 – PRODUCT DESCRIPTION

PROCESS AND INSTRUMENTATION DIAGRAM

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
ZCPR-3 ZCPR-2
Compressors
Low pressure liquid refrigerant enters the cooler and is
Low pressure liquid refrigerant enters the cooler and is
evaporated and superheated by the heat energy
evaporated and superheated by the heat energy absorbed
absorbed from the chilled liquid passing through the
from the chilled liquid passing through the cooler
cooler shell. Low pressure vapour enters the
shell. Low pressure vapor enters the compressor where
compressor where pressure and superheat are
pressure and superheat are increased. The high pressure
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.
FIG. 6 – PROCESS AND INSTRUMENTATION DIAGRAM
34
Fans
Condenser
DV
585 PSIG
HPL
HPC
PS
ZCPR-1
DV
P
Ambient Air Sensor
LPC
S
-YLLSV
Fans
P
650 PSIG
See P.R.V.
Options
450 PSIG
DV
T
HTC
LTC
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.
FORM 150.72-NM3 (1020)
ISSUE DATE 10/05/2020
Components:
Pressure Relief Valve
Service (Ball) Valve
Expansion Valve
S
Solenoid Valve
Sight Glass
Sensor Pressure
or Temperature
Service (Stop) Access Valve
Pressure Switch
PS
Filter Drier
(Removable Core)
Chilled
Liquid
Evaporator
T
Chilled
Liquid
DV
CHT
LTC
LD13139
JOHNSON CONTROLS