Chapter 6: Troubleshooting

 

Problem

Possible cause

 

 

No power.

 

 

 

 

 

Wrong voltage supplied to unit.

 

 

 

 

 

Defective on/off switch.

 

Unit does not run.

Control circuit fuse blown.

 

 

 

 

 

 

 

Defective control transformer.

 

 

Piping flow switch circuit open.

 

 

 

 

 

Pump motor off on overload.

 

 

High/Low thermostat set higher

 

 

than temperature of liquid in

 

 

system.

 

 

Defective High/Low thermostat.

 

 

Low refrigerant indicator on.

 

 

Refrigerant low pressure switch

 

 

contacts open.

 

Refrigerant high-pressure indicator

 

on.

 

 

Pump runs; compressor does not.

Fan motor out on overload.

 

Defective fan cycling control.

 

Defective fan motor.

 

 

 

Compressor internal overload or

 

fuses are open.

 

 

 

Compressor contactor holding coil

 

open.

 

 

 

Defective pump motor to

 

compressor auxiliary contact.

 

 

 

Broken wire in the compressor

 

control circuit.

Solution

Check main disconnect, fuses, wiring, and power lead to unit.

Voltage must be within plus or minus 10% of nameplate rating.

Replace.

Replace control circuit fuse. Check transformer.

Check for a short circuit. Replace.

Add water or water/glycol solution as required.

Reset and test.

Lower thermostat stage 1 set to 10°F (6°C) below the leaving temperature you want.

Replace.

Check refrigerant charge.

Sight glass should be clear and the moisture indicator should be green while compressor is running. Bubbles or foaming is normal when the hot-gas by- pass solenoid is energized. Call for service if bubbling is occurring and/or moisture indicator is yellow.

Clean the air filters.

Check condenser fans for proper rotation.

Check for dirty condenser. Reset and test.

Reset and test. Replace.

Repair or replace.

Allow time to cool and reset, then check for high/low volt-age. It must be within plus or minus 10% of the nameplate rating.

Check for open fuses and loose compressor electrical connections.

Repair or replace.

Repair or replace.

Locate and repair.

2-40 HP Portable Chillers

Chapter 6: Troubleshooting

41 of 70

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Sterling A0554831 manual HP Portable Chillers Troubleshooting
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A0554831 specifications

The Sterling A0554831 is a versatile and powerful tool designed for a range of applications, particularly in the industrial and construction sectors. Known for its robust construction and reliability, it has gained popularity among professionals and DIY enthusiasts alike.

One of the main features of the Sterling A0554831 is its durable build quality, which is designed to withstand harsh working conditions. The device typically features a high-strength casing that protects it from dust, moisture, and impact, ensuring longevity even in the most demanding environments. Its ergonomic design allows for comfortable handling, minimizing user fatigue during extended use.

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Another significant characteristic of the Sterling A0554831 is its versatility. It typically comes with multiple settings and modes, allowing users to adjust the tool according to the specific requirements of their project. Whether drilling, cutting, or fastening, the tool can accommodate various tasks, making it a valuable addition to any toolkit.

Safety features are also a priority with the Sterling A0554831. Many models are equipped with overload protection and safety switches that prevent accidental activation, safeguarding the user during operation. Additionally, some variants may include LED indicators that provide real-time information about battery life or operational status, enhancing overall user experience.

In conclusion, the Sterling A0554831 stands out in the market for its combination of durability, performance, and versatility. With advanced technologies that cater to a wide range of applications and a design focused on user comfort and safety, this tool is an excellent choice for professionals looking for dependable and effective solutions in their work. Whether you are a seasoned professional or a casual DIYer, the Sterling A0554831 is well-equipped to handle your needs with ease and efficiency.
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