York YCUL0020, Installation, Operation And Maintenance Manual

Page: 28 / 178

JOHNSON CONTROLS
28
Form 150.63-NM9
Issue date: 5/20/2021
SECTION 2 – PRODUCT DESCRIPTION
Figure 6 - Process and Instrumentation Diagram
Process and instrumentation diagram
PS
ZCPR-1 ZCPR-2
ZCPR-3
DV
HPL
HPC
P
DV
LPC
P
Condenser
Fans Fans
-YLLSV
S
T
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
S
PS
T
Ambient Air Sensor
DV
HTC
LTC
585 PSIG
650 PSIG
450 PSIG
Evaporator Coil
Pressure Relief Valve (ZP180 Scroll Only) *
Service (Ball) Valve
Expansion Valve
Solenoid Valve
Sight Glass
Sensor Pressure
or Temperature
Service (Stop) Access Valve
Pressure Switch
Filter Drier
(Removable Core)
Components:
* Smaller Compressor Scrolls Utilize Internal Reliefs.
Low pressure liquid refrigerant enters the cooler and
is evaporated and superheated by the heat energy ab-
sorbed from the chilled liquid passing through the
cooler shell. Low pressure vapor enters the compres-
sor 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 con-
densed and subcooled liquid passes through the expan-
sion valve where pressure is reduced and further cool-
ing takes place before returning to the DX Coil.
LD13139