Legend
Item Description
1HTR 1 phase 1000 Watt oil heater
1LEP Low evaporator pressure (provided by evaporator pressure transducer)
1OL 2T protector (346 V AD 600 V units only)
1T Class 2 power supply transformer
3M Condenser pump motor starter
1R Compressor motor / 1HTR heater control relay (K18 - located on I/O board)
3R VS oil pump drive run relay
1SOL Oil return solenoid valve
1SW Safety stop switch
CM Solid state overload/power fault contacts
FDTS Faulty discharge temperature sensor
FLA Full load amps (compressor motor)
FU Fuse
PGD Proximity gap distance (probe located in compressor)
HDT Refrid. high discharge temperature (provided by RT2)
HOP High oil pressure (provided by two transducers)
HOT High oil temperature (provided by RT3)
HPCO High pressure cutout
K13, K14, K17 Relays mounted on I/O board see operation manual
LCWT Leaving chilled water temp (PWM). See 160.73-PW4.
LEP Low evaporator pressure (provided by evaporator press transducer)
LLS Liquid level sensor (probe)
LOT Low oil temperature (provided by RT3 and condenser press transducer)
LOTD Low oil temperature differential (provided by RT3 and condenser press transducer)
HGBP Hot gas bypass
L1 Inductor 4A, 9mH (460 VAC) or 8A, 3mH (230 VAC)
LWT Low water temperature (provided by RT3)
MOV Metal oxide varistor
OL Motor starter overloads
OP Low oil pressure (provided by two transducers)
OVA Condenser level control actuator
PRV Pre-rotation vane motor
Remote current limit setpoint (PWM). See 160.73-PW4.
RES Resistor
RT1-RT9 Resistance temperature sensing element
SUPR Transient suppressor
TB1, TB3, TB5
Terminal block, factory wiring -
TB2, TB4
Terminal block, field connection -
TB6 Terminal block, field (bottom), factory (top)
VGD Variable geometry diffuser
VMP Vane motor potentiometer
VMS Vane motor switch
VS Variable speed oil pump drive
Field wiring
Factory wiring
Circuit board or enclosure boundary
Jack (J1, J2, ...)
Plug (P1, P2, ...)
Wiring Diagrams for Model YK (Style H) with OptiView Control Center and SSS with Modbus, VSD with
Modbus
6
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