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 streamline your ordering process, you’ll find everything you need to navigate our product lineup with ease.

Specification Documentation (WHSC Series)

E-Select Nomenclature (WHSC - WSV - WSH Series)

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	A–AE Air	AE Air is the commercial division of First Co. and specializes in Chilled Water units and Water Source Heat Pumps. This brand is available only through authorized resellers.
Cabinet	A – 44” x 27” x 23”	Size of cabinet enclosing unit
Filter Type	1”, 2”, 4” temp or perm MERV 8, 10, 11, 13, 14 1 – 1” temp 2 or 4 – sided 2 – 1” or 2” temp 4 – sided 4 – 1” or 4” temp 4 – sided 6 – 2” perm + 4” 4 – sided	Temporary / disposable and permanent filters are available in a variety of thicknesses and MERV ratings. The higher the MERV rating, the better the filter is at trapping air particles.
Heat Exchanger	C–Copper N–Cupro-Nickel	Copper offers high thermal conductivity, ideal for fast heat exchange, but less corrosion-resistant. Cupro-Nickel has lower thermal conductivity, but far superior corrosion resistance and mechanical durability, making it more suited for harsh environments.
Return Air Location	L–Left Hand R–Right Hand	Select the side of the unit to which you would like the Return Air fed.
Series	WSV, WSH WHSC	Name of product family
Supply Air Location	E–End S–Side / Straight T–Top	Select the side of the unit from which you would like the Supply Air released.
Unit Size	CFM	An air-conditioner’s unit size or nominal capacity is the output level it can handle when functioning in either cooling or heating mode. Cubic feet per minute (CFM) measures how much airflow volume passes through a space in a minute.
Voltage	208 – 230 / 1Ph / 60Hz 208 – 230 / 3Ph / 60Hz 265 / 1Ph / 60Hz 460 / 3Ph / 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.
Water Circuit	F – Front G – Economizer w/3 – Way Valve	Front placement of the water circuit is standard. A water circuit uses a three – way valve with an Economizer to divert water through a coil and cool the air, which can reduce the need to use a compressor. This process is called “free cooling” and can help reduce energy consumption and operating costs.
OPTIONS
Cabinet Insulation	0 – Std Fiberglass A – Closed Cell Foam B – Foil Faced Insulation C – Compressor Jacket E – Ext Temp Range / Geothermal F–Geothermal + Sound Kit S–Sound Kit (Closed Cell + Compressor Jacket)	Cabinet, Sound and General Insulation is available in a variety of types and can be selected based on specific product or environmental needs. Closed Cell Foam insulation is made from a dense foam of tightly packed “closed cells” which provides high thermal resistance. Foil-Face Insulation has a reflective foil layer attached to one or both sides which reflects radiant heat, reducing heat transfer. A Compressor Jacket wraps around the compressor unit to reduce noise and minimize heat transfer. Geothermal Insulation involves the use of ground-source heat pumps to transfer underground temperatures to a building as a way to naturally insulate the HVAC system.
Controls	0 – Std w/out Service Switch A – Std w/Service Switch B – DDC w/Service Switch	The Standard Relay controls the operation of the blower fan, turning it on and off per the system’s call. The Service Switch provides a simple and direct way to turn off power to the HVAC unit without needing to access the electrical panel or main breaker. A Dedicated Digital Controller (DDC) is a microprocessor-based device used to monitor and control specific HVAC equipment digitally, typically part of a building management system.
Dehumidifier	0–None H–Hot Gas Reheat w/DDC	A dehumidifier with Hot Gas Reheat (HGRH) dehumidifies air and then reheats it without using additional energy. This can be scheduled and controlled by a Dedicated Digital Control system.
General	000 – No Options 00E – E-Coating 0V0 – Vacated Premise Switch	E-Coating involves applying a protective coating to fin coils to improve corrosion resistance, enhance efficiency and reduce maintenance. A Vacated Premise Switch can be activated manually or automatically based on occupancy, making sure the system operates only when needed, reducing energy waste and costs.