Stay cool! Keep it running.

Carlson and Stewart wants to ensure that your equipment continues to run at optimal performance. On this blog, we offer important tips for maintaining your refrigeration equipment.

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SPRING CLEAN YOUR REFRIGERATION CONDENSERS It is spring time, at least that’s what the calendar says, and that means that it is time to perform your Spring Cleaning.  This is a great time of the year to clean or inspect the condensing system serving your refrigeration system.  If you don’t want to do it, Carlson and Stewart Refrigeration will...
ANSI/IIAR2-2014 has been released…so now what? The International Institute of Ammonia Refrigeration (IIAR) has been a major contributor of safe practices and design methodologies of ammonia refrigeration systems for many years.  Whether the IIAR likes it or not, they are viewed by many as a trusted group of industry professionals that are capable...
How many of you have “scale” on your evaporative condenser? [I am guessing your hand might be in the air]. How many of you feel that this is “normal” and something that should be treated as a “side effect” from running an evaporative condenser? [I am guessing your hand is still up]. Although scale buildup on evaporative condensers is common,...
HOUSEKEEPING AND GENERAL MAINTENANCE Over the years of working in literally hundreds of compressor / engine rooms we have noticed a correlation between the cleanliness and neatness of the compressor room and the general operation of the refrigeration system. The neater the compressor room the better it works! Based on our experience here are a...
HOW MUCH REFRIGERANT DO YOU NEED IN YOUR SYSTEM? This article will address the question: How much refrigerant, ammonia or halocarbon (Freon®), does your system need in order to operate properly? The simple answer - just enough to ensure that the High Pressure Liquid line leaving the High Pressure Receiver is immersed in liquid and is not drawing...
REFRIGERANT LEAK DETECTION We all know that refrigerant leaks cost money! The hissing sound of a leak is not so much SSSSSSSSSSSSSSS as it is $$$$$$$$$$$$$$$$! Let’s find and fix the refrigerant leaks in our systems. The first step is detection – we have to find the leak. • For those of you that utilize ammonia as your refrigerant...
This article will target refrigeration systems that utilize air cooled condensers, but the efficiencies to be gained apply to the users of evaporative condensers as well. First, let us remember a couple of important principles of refrigeration; 1) heat (energy) always flows from higher to lower temperatures, and 2) the function of the condenser is...
You are receiving this notice because you are the owner / operator of a refrigeration or air-conditioning system that utilizes R-22 refrigerant and we want you to understand, and be prepared for, the rapidly rising cost of this refrigerant. BACKGROUND:  The United States is bound by an international environmental agreement, called the Montreal...
How often and for how long should an air unit evaporator in a cooler or freezer be defrosted? Hot gas and electric defrosting of air units that are installed in walk-in coolers, freezers, and warehouse complexes involves a lot of expense.  If the unit is not defrosted often enough, there is the wasted energy of operating an evaporator that is...
Check your oil safety switches! Many commercial refrigeration compressors (i.e. Copeland) and essentially all industrial reciprocating compressors, like Vilter 450, 440 & 350 series, have force fed lubrication systems.  The oil that is in the crankcase is pumped to various journals and bearings to lubricate these internal parts.  The oil pump...

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