First Co USM318AP USM Series Heat Pump or Cooling Only User Manual

: June 13, 2024
: First Co

Table of Contents

FEATURES
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**First Co USM318AP USM Series Heat Pump or Cooling Only User Manual

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The USM series coil can be field installed into an air handler with sufficient space. A piston-type metering device is utilized for maximum flexibility

The USM series coil can be field installed into an air handler with sufficient space. A piston-type metering device is utilized for maximum flexibility. Optional R-22 or R-410A field installed TXV kits are available.
First Co’s customer is ultimately responsible for confirming which fan coil models are compatible with selected outdoor unit(s) and which expansion valves (if any) are required.
To determine certified indoor/outdoor matches, go to: www.firstco.com or **AHRI.org.

**

HORIZONTAL DRAIN PANS ARE OPTIONAL AND MUST BE ORDERED SEPARATELY

FEATURES

For use with up to 14 SEER condensing units.
High efficiency copper tube, aluminum fin coil with piston type metering device
Coils are circuited for cooling only or heat pump operation
Sweat refrigerant connections
3/4” MPT primary and secondary condensate drain connections
Factory installed equalizer connection on coil header to facilitate field installation of expansion valve kits
Coil drain pan is coated for corrosion resistance

PHYSICAL DIMENSIONS

MODEL NUMBER| NOMINAL TONNAGE RANGE| A| B| C| D| E| F| G| LIQ. X SUCT. LINE OD SWT| FITS CABINET
USM318AP| 1.5| 12-3/4| 18-1/2| 19-1/4| 3-1/2| 3-3/8| 3| 8| 3/8 X 5/8| 20 X 20
USM424AP| 1.5 – 2.0| 12-3/4| 18-1/2| 19-1/4| 3-1/2| 3-3/8| 3| 8| 3/8 X 5/8| 20 X 20
USM330AP| 2.0 – 2.5| 13-3/4| 18-1/2| 22-1/4| 3-1/2| 3-3/8| 3| 8| 3/8 X 3/4| 20 X 23
USM436AP| 2.5 – 3.0| 15| 18-1/2| 22-1/4| 3-1/2| 3-3/8| 3| 8| 3/8 X 3/4| 20 X 23
USM348AP| 3.5 – 4.0| 18-1/2| 19-3/4| 27| 5-1/2| 3-3/4| 4| 8-5/8| 1/2 X 7/8| 21-1/2 X 28
USM460AP| 4.0 – 5.0| 18-1/2| 19-3/4| 27| 5-1/2| 3-3/4| 4| 8-5/8| 1/2 X 7/8| 21-1/4 X 28
USM460BP| 4.0 – 5.0| 18-1/2| 23-1/4| 27| 5| 3-3/4| 6| 10-3/8| 1/2 X 7/8| 25-1/4 X 28

Notes:

Condensate drains are 3/4″ MPT

HORIZONTAL DRAIN PANS (For First Co. air handlers only – field installed)

EXPANSION VALVE KITS (Heat Pump or cooling only) (FIELD INSTALLED)

In keeping with its policy of continuous progress and product improvement, First Co. reserves the right to make changes without notice. Maintenance for all First Co. products is available under “Product Maintenance” at www.firstco.com.

NOTES:

Above expansion valve kits are approved for both cooling only (non heat pump) or heat pump applications.
Valves are non-bleed type. Field added. Hard start kit may be required.
Valves mount inside unit cabinet

WARNING AVERTISSEMENT ADVERTENCIA Cancer and Reproductive Harm Cancer et Troubles de l’appareil reproducteur Cáncer y Daño Reproductivo www.P65Warnings.ca.gov

FIRST CO.
P.O. BOX 270969 – DALLAS, TEXAS 75227
PH. 214-388-5751
SALES@FIRSTCO.COM
WWW.FIRSTCO.COM