Joe Marchese Articles

Working With an Unknown Refrigerant

This can be a difficult, and potentially costly, scenario

July 3, 2020

When working on a refrigeration system, technicians may occasionally come across one where the type of refrigerant is unknown.

Several Options Available to Connect Copper Tubing

Brazed and pressed connections both have advantages and disadvantages

Joe Marchese

May 26, 2020

Today, the use of pressed connections for joining both hard drawn and soft copper tubing is gaining popularity for many reasons.

Remaining Productive During Your Downtime

Take this opportunity to make sure your tools and truck are in tiptop shape

Joe Marchese

May 3, 2020

What can a refrigeration technician do during this downtime? One great option is to take this opportunity to enhance your knowledge of the trade.

Understanding Low-Pressure Controls in Refrigeration Systems

When added, they control and protect the compressor

Joe Marchese

April 10, 2020

When working on a system, it is important to determine how the low-pressure control is being used and make sure it is properly set.

HOW-TO

Checking airflow across an evaporator during a service call

Joe Marchese

March 30, 2020

How important is airflow across an evaporator in a properly operating air conditioning system? If you ask a wide range of technicians you are likely to get many different answers, but the general consensus would likely be that it is important.

Determining the Cause of Higher-Than-Normal Discharge Pressure

Identifying the underlying reason for this condition can be tricky

Joe Marchese

March 9, 2020

Refrigeration systems operating at a higher-than-normal discharge pressure can be the result of several different issues.

Verifying a Proper Pump Down

Following correct procedure can prevent damage to compressor

Joe Marchese

February 10, 2020

Refrigerant migration can be damaging to a compressor. The refrigerant migrating back to the compressor can possibly slug the component.

Pay Attention To Pressure Drop in HVAC Systems

Severe pressure drop can adversely affect capacity of system

Joe Marchese

January 13, 2020

We need to be aware of the possibility of severe pressure drops creating an issue for the system and how we analyze its operation.

To Repair Or Replace Refrigeration Equipment

Contractor advice can help store owners make the right decision

Joe Marchese

December 9, 2019

If the repair will be more than 50 percent of the cost of a new system, it is generally best to replace it. However, there may be other factors.

How to Find the Technical HVAC Information You Need

Tracking down wiring diagrams and other materials can require patience

Joe Marchese

November 4, 2019

Controls offer many benefits to the design and operation of a system, but they can add a level of difficulty when troubleshooting a system failure.

Articles by Joe Marchese

Working With an Unknown Refrigerant

Several Options Available to Connect Copper Tubing

Remaining Productive During Your Downtime

Understanding Low-Pressure Controls in Refrigeration Systems

Checking airflow across an evaporator during a service call

Determining the Cause of Higher-Than-Normal Discharge Pressure

Verifying a Proper Pump Down

Pay Attention To Pressure Drop in HVAC Systems

To Repair Or Replace Refrigeration Equipment

How to Find the Technical HVAC Information You Need

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