Nomenclature Guide

This page is your go-to resource for understanding the model numbers and codes used in our products. Whether you’re looking to decode specifications or learn more about the industry, you’ll find everything you need to navigate our product lineup with ease.

A2L Transition Video

WHHP - WHSC - WCX

NOTE:

Not all descriptors may appear for each model. See individual product specification documents for complete model number configuration options

Glossary

Section	Digit Codes	Description
Brand	F–First Co.	First Co. is a leading manufacturer of multi-occupant and commercial industry HVAC products.
Cabinet Size	A–32” X 24” X 19” A–44” X 27” X 23” B–28” X 25.75” X 19” C–23” X 29.5” X 22”	Through the Wall Split Units include a cabinet to accommodate the selected unit size.
Series	WHHP WHSC WCX2, WCX4	Name of product family
Unit Size	BTUHs	Air conditioners and heat pumps remove heat from the air inside a building and move it outside. HVAC Unit Size or capacity is measured in tons or BTUHs (British Thermal Units per Hour). This metric determines how much heat a unit can remove from a room within an hour. A one-ton unit can remove 12,000 BTUH.
Voltage	120 / 1Ph 60Hz 208-230 / 1Ph / 60Hz	Voltage is the electrical pressure that pushes an electric current through a circuit. Higher voltage indicates a more powerful pressure. Most HVAC systems use with 115 (120)V or 230V depending on size and capacity.