
(Mar, 2012)
CeilAiR OHS Series Installation, Operation & Maintenance Manual
ir Technology Systems, Inc.
1.0 Introduction
1.1 General
Thank you for your selection of the CeilAiR® ceiling-
mounted air conditioning system made by Stulz Air
Technology Systems, Inc.
CeilAiR overhead air conditioning systems (OHS) are
designed and constructed using the fi nest available
materials/components, state-of-the-art technology
and quality craftsmanship to provide years of trouble-
free service. Due to technological advancement, all
components are subject to change without notice.
All CeilAiR OHS systems and CyberAiR® centrifugal
condensers are designed to be installed indoors,
unless otherwise noted on the equipment. Propeller-
type condensers, condensing units, drycoolers and
pump packages are designed for outdoor use.
1.2 Product Description
CeilAiR OHS systems are designed to be the most
versatile and fl exible ceiling-mounted air condition-
ing systems in the industry. The unit is available in
air-cooled, water-cooled, glycol-cooled and chilled-
water confi gurations. The cooling capacity in BTU/Hr
will depend on the unit size, which can range from 1
to 10 tons, and can be either a single stage or dual
stage unit.
The functional modes of operation, in addition to
cooling, are heating, humidifi cation, dehumidifi cation
and fi ltration, which provides complete environmental
control of a conditioned space. The cabinet
confi guration is available in a 2’ x 4’ frame for units
ranging from 12,000 to 40,000 BTU/Hr (spot cooler
or ducted) or a larger frame for units ranging from
48,000 to 120,000 BTU/Hr (ducted only). For ducted
units, there are three basic confi gurations of airfl ow
patterns: 90º/Right Angle, Straight-Thru and In/
Out Same-Face (reference Figure 3). Refer to the
installation drawing provided with your unit for the
type of cabinet confi guration and for the layout
dimensions.
1.3 Controls
SATS offers a wide variety of control options for
CeilAir OHS series A/C systems. The controllers are
typically remotely mounted to a wall or control panel.
Your unit may be furnished with a Digital Thermostat
offered for basic control of Ceilair OHS systems. The
A-Tech 1.1 is utilized for single stage units and the A-
Tech 1.2 is utilized for dual stage units (see Section
3.3.2).
The advanced E² microprocessor controller is now
available for Ceilair OHS systems which provides
enhanced features for more comprehensive control
of the unit. These features include: full alarm system;
input/output monitoring status; full integrated control
of heating, cooling, humidifi cation, and dehumidifi ca-
tion; multi-unit control and remote communication
with building management systems.
1-1
If your unit is equipped with an E² controller, an operating manual is provided under separate cover. Refer to
that manual for detailed instructions on operating the system controller.
A-Tech- 1.2A-Tech-1.1
Digital Thermostats
Advanced E² Microprocessor
Controller
E² Controller Display
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