Pro Refrigeration CHILSTAR Series Operation Manual page 22

PROBLEM
compressor will not run
Compressor noisy or vibrating
High Discharge Pressure
Low Discharge Pressure
Low Suction Pressure
7-5
High Suction Pressure
Compressor will not unload
Oil Alarm
Motor Overload Fault, tripped Circuit
Breaker, or Blown Fuses
Compressor Thermal Switch Open
Low Pressure Freeze Alarm
POSSIBLE CAUSES
A Main Switch / Circuit Breaker Open
B Fuse Blown
C Thermal Overloads Tripped
D Defective Contactor or Coil
E System shut down by Safety Device
F No Cooling is required
G Liquid Line solenoid will not open
H Motor Electrical Trouble
I Loose Wiring
J Circulation Pump Not Running
A Liquid Refrigerant Flooding to Crankcase
B Worn Compressor
A Condenser Water Supply is insufficient or
temperature is too high.
B Fouled Condenser (Water)
Fouled Cooling Tower
Dirty Condenser Fin or Tube Surface (Air)
C Non-Condensables in System
D System overcharged with Refrigerant
E Discharge Valve Partially closed
F High Ambient Conditions
A Faulty Condenser Fan Control
B Suction Shut off partially closed
C
D
E Insufficient Refrigerant Charge
F Low Ambient Conditions
A Lack of Refrigerant
B Clogged Liquid Line Filter Drier
C Expansion Valve malfunction
D Condensing Temperature too low
E Compressor will not unload
F Insufficient Flow through evaporator
G Not enough Glycol Concentration or Glycol
Level in Tank is too Low.
A Excessive Load
B Expansion Valve malfunction
A Unloader mechanism defective
B Faulty Thermostat or Pressure Control
A Excessive Liquid Refrigerant in crankcase
B Oil Failure Control defective
C Worn Oil Pump
D Stuck reversing gear on oil pump
E Worn Bearings
F Low Oil Level
G Pump Housing Gasket leaks
A Low Voltage during high load conditions
B Grounded wiring in motor or power circuit
C Loose power wiring
D High Condensing Pressure
E Voltage unbalance
F High Ambient at bi-metal Overload Relay
A Operating out of design conditions
B Discharge Valve Partially closed
C Blown Valve Plate Gasket
D Power Line Fault
A Wrong Pump Rotation
B Evaporator Freeze Up
C Incorrect Freeze Point setpoint
Packaged Glycol Chiller Systems |
CORRECTIVE STEPS
A Reset Switch / Circuit Breaker
B Check Electrical Circuits and Motor Windings
for shorts or grounds. Investigate for possible over-
loading. Replace Fuse or reset Circuit Breaker after
fault is corrected.
C Reset any tripped thermal overloads, Check unit
closely when unit comes online.
D Repair or replace coil
E Determine Type and Cause of shut down and
correct before resetting.
F Wait until Unit calls for Cooling. Check setting of
Thermostat. Check the Temperature of Glycol Solution.
G Check for Voltage at Solenoid Coil, replace coil.
H Check motor for opens, short circuit, or burnout.
I Check all wire junctions, tighten loose connections.
J Check overload relay on circulation Pump
A Check Superheat Setting of Expansion Valve(s).
Check the Glycol Solution Percentage, make
certain that evaporator is not freezing up.
B Replace Compressor
A Adjust Water Regulating Valve, investigate ways to
increase water supply.
B clean
C Purge out non-condensables, reclaim refrigerant
and recharge with new refrigerant.
D Remove excess refrigerant charge
E Open Valve
F Check Condenser Rating Tables
A Check Fan Controls
B Open Valve
C Adjust Water Regulating Valve or Water Supply
D See "Low Suction Pressure" below
E Check for leaks, repair & recharge
F Check Condenser rating tables
A Check for leaks, repair, & recharge.
B Replace
C Check Superheat Setting, adjust or replace.
D Check means of regulating Condensing Temperature
E See "Compressor will not unload" section below
F Check circulation pump rotation and motor amperage.
Make sure Gate Valves on Evaporator inlet & outlet
are completely open.
G Add required Glycol to System
A Reduce Load or add additional cooling equipment
B Check Superheat of TXV, replace if necessary
A Replace mechanism
B Check settings of device, replace if necessary
A Check crankcase Heater. Adjust TXV superheat.
B Replace
C Replace Oil Pump.
D Reverse Rotation of Compressor
E Replace Compressor
F Check System for leaks, repair, & add Oil.
G Replace Gasket
A Check for excessive voltage drop
B Check wiring and repair fault.
C Check wiring and tighten any loose connections
D See corrective steps for "High Discharge Pressure"
E Check Power Supply. Contact Power Company. Do not
Operate until fault is corrected.
F Provide Ventilation to Motor Controls
A Add facilities to prevent system from operating out of
design conditions.
B Open
C Replace Gasket
D Check Power Supply. Contact Power Company. Do not
Operate until fault is corrected.
A Reverse Rotation of circulation pump (CW from motor end)
B Check Glycol Percentage. Must be at least 20 F below
thermostat set point.
C Adjust freeze point for application, consult factory.
III