Stulz CeilAir CW - Figure 2. E 2 Microprocessor Controller and Display; Figure 1. A-Tech Digital Thermostats; Safety; General

11OCH0006F08/13/2024
CEILAIR
®
CW & DX IOM
1.4.1 GENERAL
1.1 General
The CeilAir
®
(OHS) ceiling mounted air conditioning unit documented in this manual is designed and
manufactured by STULZ Air Technology Systems, Inc.
CeilAir systems are constructed using the finest available materials/components, state-of-the-art
technology and quality craftsmanship. The unit will provide years of trouble free service if installed and
maintained in accordance with this manual. Damage to the unit from improper installation, operation, or
maintenance is not covered by the warranty. Due to advances in technology, components described herein
are subject to change without notice.
All CeilAir units and CyberAir centrifugal condensers are designed to be installed indoors, unless otherwise
noted on the equipment.
1.2 Product Description
CeilAir units are designed to be the most versatile and flexible ceiling-mounted air conditioning systems in
the industry. The unit is available in air-cooled, water-cooled, glycol-cooled, and chilled-water configurations.
The cooling capacity in Btu/h will depend on the unit size, which can range from 1 to 10 tons (3.535 kW),
and can be either a single stage or a dual stage unit.
In addition to cooling, other functional modes of operation include heating, humidification, dehumidification
and filtration to provide complete environmental control of a conditioned space. The cabinet configuration
is available in a 2 ft x 4 ft frame for units ranging from 12,000 to 40,000 Btu/h (spot cooler or ducted) or a
larger frame for units ranging from 48,000 to 120,000 Btu/h (ducted only). For ducted units, there are three
basic configurations of airflow patterns: 90º right angle, straight-through (standard), and same-face (see
Figure 9 in section 2.4.3.1). Refer to the installation drawing provided with the unit for the type of cabinet
configuration and for the layout dimensions.
1.3 Control Devices
STULZ offers a variety of control devices for CeilAir units. Control interfaces are typically remotely mounted
to a wall or control panel.
The default control device for CeilAir units is the ATech digital thermostat, which provides basic control of
the system. Slightly different wiring is used with the thermostat in single- and dual-stage units, as shown in
Figure 16 in sections 2.7.2.12.7.2.2. The single-stage version is the ATech 1.1. The two-stage version is
the ATech 1.2. An operating manual for the thermostat may be provided on request separately.
Figure 1. ATech Digital Thermostats
The advanced STULZ E² microprocessor controller is also available for OHS systems. This controller
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, humidification, and
dehumidification; and remote communication with building management systems. An operating manual for
the E² controller is provided with the unit separately.
Figure 2. E
2
Microprocessor Controller and Display
1.4 Safety
1.4.1 General
STULZ uses notes, cautions, and warnings in its manuals to draw attention to important operating and safety
information.
A bold text NOTE alerts you to an important detail.
A bold text CAUTION provides information that is important for protecting your equipment and performance.
Be especially careful to read and follow all cautions that apply to your application.
A bold text WARNING provides information important for protecting you from harm. Pay very close attention
to all warnings that apply to your application.