Johnson Controls SAB 355 - General Key to Piping Diagram - Continued

Engineering manual - SAB 355 Screw compressor unit (including ATEX)
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004100 en 2020.10
Technical description
4.1.35 General key to piping diagram - continued
Legend (Covers all P&I diagrams in this manual)
C Compressor TSH
Temperature switch high alarm
CV
Check valve
TW
Thermowell
DP
Discharge pressure
VI
Vi control
FG
Flow glass
SB-2
Inlet bearing and balance piston
HV
Hand valve
SB-3
Discharge bearings and seal
HTR Heater SC-1
Slide valve - unload
LG
Level glass
SC-2
Slide valve - load
LSLL
Separator low oil level shutdown
SC-3
Moveable slide stop
M Motor SC-4
Moveable slide stop
1MC
Motor control centre
SC-5
Inlet pressure
2MC
Motor control centre
SC-6
Discharge pressure
NOS
No oil switch
SC-7
Seal weepage
OF
Oil filter
SC-8 Oil drain connection
OP
Oil pressure
SC-9
Inlet housing oil drain
P
Demand pump
SC-13
Oil drain cylinder
PAH
High discharge pressure alarm
SE-1
Electrical connection
PAHH
High discharge pressure shutdown
SE-2
Electrical connection
PAL
Low pressure alarm
SL-1
Liquid injection low Vi
PALL
Low pressure shutdown
SL-2
Liquid injection high Vi
PDAH
High pressure differential alarm
SM-1
Main oil injection
PDI
Pressure differential indicator
SV-1
Vapour injection tongue and groove
PDSLL
Compressor low diff. pressure cut-out
SD-1
Threaded hole for oil return from
coalescer
EC
UniSAB III electronic computer control
TW-1
Thermowell
PE
Pressure transducer Pressure transducers indicate:
PI
Pressure indicator
PE-1
Oil pressure (manifold)
PIC
Pressure indicator controller
PE-2
Oil pressure before filter
PM Pump motor
PE-3
Discharge pressure
PS
Pressure switch control
PE-4 Suction pressure
PSV
High pressure safety valve Temperature probes indicate:
SP Suction pressure TE-1 Suction gas temperature
STR Strainer TE-2
Discharge gas temperature
TAH
High temperature alarm
TE-3
Lubricating oil temperature
TAHH
High temperature shutdown
TE-4
Separator oil temperature
TAL
Low oil temperature alarm Solenoid valve function:
TALL
Low oil temperature shutdown
YY-1
Energise unload slide valve
TC
Temperature controller
YY-2
Energise increase volume rate
TCV
Thermal control valve
YY-3
Energise increase volume ratio
TE
Temperature element
YY-4
Energise decrease volume ratio
TI
Temperature indicator
YY-5
Solenoid valve
TS
Temperature switch
YY-9
Dual-port liquid injection solenoid
ZI2
Capacity linear transmitter, slide valve
ZI3
Volumizer transmitter - slide stop