Condensing temperatures often give technicians valuable hints as to what the problem may be within a refrigeration system. The high side of the refrigeration system offers valuable information to the wise technician.

The core of a refrigeration system is the compressor that is designed to pump cool refrigerant gas from the evaporator into the condenser. Refrigeration compressors need to be properly maintained and require periodic inspection and testing.

In this edition of the Btu Buddy series, Bob gets a call from the dispatcher about an office that has electric heat. It is very cold outside and one of the office zones is not heating as it should.

For some of you, this article will be a review to refresh your memory about the importance of "safety first." For those of you starting out as technicians, it could keep you from serious injury - or worse - out in the field.

Although some technicians are unsure of its operation and many customers have no clue it is even there - much less what it does - the economizer continues to fight a lonely battle for recognition as it saves building owners money on utility bills.

This article explores how a restricted metering device will affect system performance and efficiency. The system is a commercial refrigeration system with a thermostatic expansion valve (TXV) as the metering device.

In this installment of the series, Bob is called to do a tuneup on an oil boiler. When he starts it up, he finds too much heat is going up the flue. Btu Buddy helps him in narrowing down a solution.

Spending as little as 10 minutes discussing proper humidifier operation and troubleshooting tips with the homeowner at the time of installation could eliminate future callbacks.

In this edition of the Btu Buddy series, Bob encounters a furnace that is not drafting like it should. Btu Buddy helps him determine the problem and make recommendations to the homeowner.

This application note was written to provide you with an understanding of the basic principles of fossil fuel heating systems and how to troubleshoot these systems using thermometers, digital multimeters, pressure/vacuum modules, and other accessories.