TROUBLESHOOTING REFRIGERATION SYSTEM

Trouble

Probable Cause

Remedy

COMPRESSOR DOES NOT

A. Ice bank sufficient.

A. Refrigeration not called for.

OPERATE.

 

 

B.Unit power cord unplugged, power switch (if applicable) in “OFF”position, or drop-in refrigeration assembly power cord unplugged.

B.Plug in power cord(s) or place Unit power switch in “ON” position.

C.No power source (blown fuse or tripped circuit breaker).

D.Inoperative Unit power switch (if applicable) or power cord unplugged.

C.Replace fuse or reset circuit breaker. (NOTE: Fuse or circuit breaker are not part of unit).

D.Replace power switch or plug Unit power cord into electrical outlet.

E. Low voltage.

E. Voltage must be at least 103 volts

 

(115 VAC unit) or 208 (230 VAC

 

unit) at compressor terminal when

 

compressor is trying to start.

F.Loose, disconnected, or broken wiring.

G.Overload protector cut out; overheated compressor. Condenser fan motor not operating as required.

H.Inoperative overload protector or start relay.

F.Tighten connections or replace broken wiring.

G.Compressor will cool enough to restart. Do not overdraw cooling capacity of Unit. Refer to

“CONDENSER FAN MOTOR NOT OPERATING”in this section.

H.Replace inoperative part.

I.Inoperative ice bank control probe.

I.Replace ice bank control.

 

J.

Inoperative compressor.

J.

Call service person.

COMPRESSOR WILL NOT

A.

Ice bank control cap tube

A.

Replace ice bank control.

STOP AFTER SUFFICIENT

 

kinked or broken.

 

 

ICE BANK IS PRODUCED.

 

 

 

 

(NOTE: ICE BANK SHOULD

 

 

 

 

JUST COVER CONTROL

 

 

 

 

BULB).

 

 

 

 

B.Ice bank control stuck in closed position.

B.Replace ice bank control.

45

312027000

Page 50
Image 50
Cornelius R-134A service manual Troubleshooting Refrigeration System

R-134A specifications

Cornelius R-134A is a refrigerant commonly used in various cooling and air conditioning applications. It belongs to the hydrofluorocarbon (HFC) family and has become a favored alternative to many ozone-depleting substances. Unlike its predecessors, R-12, which has been phased out due to its detrimental effects on the ozone layer, R-134A offers a more environmentally friendly solution, albeit still having global warming potential.

One of the main features of R-134A is its favorable thermodynamic properties. It exhibits a low boiling point of approximately -26.3°C (-15.3°F), making it suitable for various refrigeration applications, including automotive air conditioning, commercial cooling systems, and domestic refrigerators. Its efficiency is regarded as superior, allowing for quick heat absorption and dissipation. This efficiency translates into energy savings, ultimately benefiting both consumers and manufacturers.

R-134A also boasts a relatively high vaporization heat, demonstrating its effectiveness in heat transfer processes. The low toxicity and non-flammability of R-134A further enhance its appeal, as it poses minimal risk during handling and application. This characteristic makes R-134A safer for technicians and users compared to older refrigerants, which presented higher health hazards.

Within modern technologies, R-134A plays a crucial role in both chiller systems and heat pump applications. It is compatible with various lubricants, allowing manufacturers to utilize R-134A in existing systems with minimal modifications. However, it is essential to use the correct type of oil, as mixing different types can lead to system inefficiencies and potential failure.

Despite its advantages, R-134A has a global warming potential of around 1,430 times greater than carbon dioxide, prompting the refrigerant industry to look for alternatives. Newer refrigerants, such as R-1234yf, offer lower environmental impact, driving a shift towards more sustainable options.

In conclusion, Cornelius R-134A remains a widely used refrigerant known for its efficiency, safety, and effectiveness in heat transfer. While it has played a significant role in the refrigeration and air conditioning industries, the ongoing search for eco-friendly alternatives highlights the need for continued innovation and adherence to environmental standards.