Lettered Model Numbers - ClimateMaster

Lettered Model Numbers A Model number starting with two or three letters followed by the size of the unit has been used extensively and is current nomenclature policy. The first two letters designate the Model series. The third letter is normally used for the unit configuration: vertical upflow (V), horizontal (H), and down discharge (D). The next three digits (sometimes only two) after Model series is the unit cooling capacity in thousands of BTUH. 036 is 36,000 BTUH. A ton is 12,000 BTUH, some the 036 is a three-ton unit. After the first 5 or 6 digits, the function of the digit has varied over time.

through the wall units and air cooled. We no longer make any PTAC units and refer customers to others. We made PTAC’s with both letter model numbers and numbered model numbers (700 series). The left most added text box (in red) indicates first the equipment general type such as horizontal package or water to water units.

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  Water, Cooled, Air cooled

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