Specifications

The outdoor unit can be mounted on any type or weight roof,
and the indoor units take up little valuable, rentable space. Be-
cause they are duct-free, not having to run large ductwork
leaves additional space to be rented or utilized, making the
building even more profitable.
In addition, the small size makes these units easily moveable.
When floor plans change, the units can be quickly reinstalled.
EASY-TO-USE CONTROLS — The microprocessor-based
control in the high-wall fan coil unit is easy to use, permitting
easy changes for maximum comfort. The microprocessor offers
the ultimate in comfort and efficiency. All units automatically re-
start and retain their memories after a power failure, eliminating
unnecessary service calls and service disruption. High-wall
units are equipped with a wireless remote controller. Under-
ceiling and in-ceiling cassette units feature standard 24 v con-
trols with new solid-state multifeatured electronic thermostats.
All units may be integrated into most building control systems.
WIDE RANGE OF ACCESSORIES — Customizing the duct-
free split systems to your application is easily accomplished with
the many accessories available.
Accessories for the high-wall and ceiling-suspended fan coils in-
clude an internal condensate pump to provide installation flex-
ibility. (Condensate pumps are standard on in-ceiling cas-
settes.) Ventilation-air capability is available as an accessory on
ceiling suspended units and in-ceiling cassettes. In addition,
limited ducting is available to connect in-ceiling cassettes (for
example, to duct to an adjacent room).
AGENCY LISTINGS — All systems are listed with ARI (Air Con-
ditioning & Refrigeration Institute), UL (Underwriters’ Laborato-
ries), CSA (Canadian Standards Association), and CEC
(California Energy Commission).
TABLE OF CONTENTS
Page
Features/Benefits ................................1-4
Model Number Nomenclature ........................5
ARI Capacities ..................................6,7
Accessories ....................................8-11
Physical Data .................................11-14
Base Unit Dimensions ...........................15-19
Selection Procedure ..............................20
Performance Data ..............................21-34
Electrical Data ...................................35
Typical Piping and Wiring ........................36-38
Application Data ................................39-43
Typical Wiring Schematics ........................44-47
Controls ......................................48,49
Guide Specifications ............................50-54
9
8
7
6
5
4
3
2
1
LEGEND
1—Service Gage Ports
2—Solenoid Valves and Thermostatic Expansion
Valves Locations (Hidden)
3—High-Efficiency Scroll Compressor
4—Suction Service Gage Ports
5—Solid Brass Service Valves
6—High- and Low-Pressure Switches to
Monitor and Safeguard Compressor
7—Copper Tube/Aluminum Fin Coil
8—High-Efficiency Fan Motor
9—Weatherized Cabinet of Heavy-Duty
Galvanized Steel
538S Condensing Unit (024 Size Shown)
3