Introduction
The Tempmaster® Omni™ Premier rooftop units are
a single package with cooling only or cooling with
gas, electric, hot water, or steam heat. The units
can be ordered with a variety of factory-installed
options.
The units are designed to be installed on a factory
provided roof curb, a field manufactured roof curb,
a field provided dunnage steel metal frame, or
at grade level on a concrete pad. The units are
intended for outdoor installations only.
The units are completely assembled on rigid,
permanently attached base rails. All internal piping,
electrical wiring, and the proper refrigerant charge
is completed at the factory, as well as factory
testing. The units require field electrical wiring
for power and controls, field connected ductwork,
field connected gas piping (if applicable), field
connected hot water or steam piping (if applicable),
and condensate drain(s). Units with gas heat also
require the installation of a factory provided flue gas
outlet hood.
The Premier rooftop unit is designed for
serviceability. With small details, such as a
maintenance safety tie-off on the roof of the
condenser section that complies with OSHA
requirements, along with an optional single
handle latching mechanism for doors, the unit was
designed for easy service.
Options to make the unit serviceable include a
convenience outlet to power lights and tools:
internal lights in the air handler section; viewports
in doors of serviceable compartments to enable
easier unit inspection; and extended grease lines
to simplify fan bearing lubrication for belt-driven
return and exhaust fans. Standard DDP supply
fans do not require lubricating the fan bearings or
changing belts.
Numerous refrigeration options are also available,
including replaceable core filter driers, liquid and
suction isolation valves, as well as high and low
pressure transducers in each circuit that enable
easier sub-cooling and superheat measurements.
Compare the model number on the unit you're
installing or maintaining to the
included in this manual
to find the options that were selected for your unit.
Ecological and economical
design
The Premier rooftop units feature a capacity range
from 25 ton to 80 ton. The units are configured
to order with a wide selection of factory installed
options. A complete range of heating and cooling
options are provided to meet today’s customers’
requirements. The unit has also been thoughtfully
designed to include several features that reduce
service and installation time.
Tempmaster provides a product offering that meets
or exceeds the following regulations:
•
ASHRAE 90.1-2019 EER/IEER requirements
•
Department of Energy 2023 IEER
requirements
•
ASHRAE 189.1-2014 IEER requirements
•
Consortium of Energy Efficiency (CEE) 2019
highest tier efficiency ratings
•
California Title 24-2016 standards
•
ASHRAE 62 requirements for indoor air quality
(IAQ)
•
All units are rated in accordance with the AHRI
Standard 340/360
All units with gas heat shall meet the requirements
of AHRI CFRN Certification Program and Code
of Federal Regulations, 10 CFR Part 431. This
references efficiency test method in standard ANSI
Z21.47.
Condensing section
Scroll compressors
Reliable, efficient, trouble-free operation is the
true measure of a rooftop unit’s value. That’s why
Premier air conditioners use established scroll-
compressor technology to deliver dependable,
economical performance in a wide range of
applications.
Premier units offer the latest generation of
compressor enhancements added to the scroll’s
inherent strengths. The simplicity of a hermetic
scroll compressor allows the use of fewer moving
parts to minimize breakdown.
Multiple compressor staging
Through the use of the standard fixed speed or
optional variable speed drive scroll compressors,
the unit has the capability to stage its cooling by
enabling and disabling compressors on multiple
circuits. Smaller steps of cooling capacity provide
tighter control of the building environment
and occupant comfort while optimizing energy
efficiency.
The unit provides a best in class, number of cooling
capacity steps, providing seven or more steps of
capacity control, on fixed speed compressors.
Tempmaster
®
Omni™ Premier 25 Ton to 80 Ton Rooftop Units Installation and Maintenance Guide
15
Tempmaster
