How To Look At A House
McGarry and Madsen's home inspection blog for buyers of
site-built, mobile/manfuactured and modular homes
What size in tons is my Climatemaster heat pump?
Monday, May 18, 2020
Climatemaster does not conform to the standard that many other manufacturers use of rounding off the reference number for size of unit to a BTU number that equals a ton, or half ton, of cooling capacity, where a ton equals 12,000 BTU. So the model number on the data sticker is not always divisible by 12 or 6. Instead, the number indicates the thousands of BTU. For example, TAH049CGSMBS is 49,000 BTU (a little over 4 tons). Older units have a shorter model number, but similar system. So ULW275 equals 27,000 BTU.
If you are unsure whether you have found the right two numbers, you can double-check it by looking for the “RLA” rating on the data plate. RLA is an acronym for Rated Load Amperage, and is what the maximum amperage should be when the condenser up and running. If you divide the RLA by 6 for older units and 5 or 6 for newer units, you should get a number that approximates (not exactly) the tonnage of the system. Make sure you use RLA and not LRA, Locked Rotor Amperage, which is the surge of amps necessary to overcome inertia and start the system. It averages around five times the RLA.
To determine the age of a Climatemaster system, go to our blog post How can I tell the age of a ClimateMaster heat pump or air conditioner from the serial number?
And to figure out what all the other numbers listed on the condenser data plate mean, go to our blog post How do I understand the air conditioner or heat pump condenser label (data plate)?
To learn more about heating and air conditioning systems, see these other blog posts:
of Blog Posts
Top 5 results given instantly.
Click on magnifying glass
for all search results.