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Chapter 12.0 Guide Specifications
This section contains written specifications for the TTS/TGS/TTH/TGH series compressors for use in
system design specifications.
12.1 General
Construction shall utilize a two-stage, variable-speed, centrifugal compressor design requiring no
oil for lubrication. Compressor shall be constructed with cast aluminum casing and high-strength
thermoplastic electronics enclosures. The two-stage centrifugal impellers shall consist of cast and
machined aluminum. The motor rotor and impeller assembly shall be the only major moving parts.
12.2 Refrigerant
TTS and TTH compressors are designed for use with R134a and R513A while TGS and TGH compressors
are designed for use only with R1234ze(E) and R515B. The TGS490 compressor is designed for use with
R515B and R1234ze(E).
12.3 Compressor Bearings
The compressor shall be provided with radial and axial magnetic bearings to levitate the shaft, thereby
eliminating metal-to-metal contact, and thus eliminating friction and the need for oil. The magnetic
bearing system shall consist of front, rear, and axial bearings. Both the front and the rear bearings are
to levitate the shaft at X and Y directions, and the axial at Z direction. Each bearing position shall be
sensed by position sensors to provide real-time repositioning of the rotor shaft, controlled by onboard
digital electronics.
12.4 Capacity Control
The compressor shall have a Variable Frequency Drive (VFD) for linear capacity modulation, high
part-load efficiency, and reduced in-rush starting current. It shall include an Inverter that converts
the DC voltage to an adjustable three-phase AC voltage. Signals from the compressor controller shall
determine the inverter output frequency, voltage and phase, thereby regulating the motor speed.
In case of power failure, the compressor shall be capable of allowing for a normal de-levitation and
shutdown.
Compressor speed shall be reduced as condensing temperature and/or heat load reduces, optimizing
energy performance through the entire range of capacity. Capacity modulates infinitely as motor
speed is varied across the range. IGVs shall be built-in to further trim the compressor capacity in
conjunction with the variable-speed control to optimize compressor performance at low loads. Refer
to Danfoss LLC Selection Software for performance calculations and limits.
12.5 Compressor Motor
The compressor shall be provided with a direct-drive, high-efficiency, permanent-magnet
synchronous motor powered by PWM voltage supply. The motor shall be compatible with high-speed
variable-frequency operation that affords high-speed efficiency, compactness and soft start capability.
Motor cooling shall be by liquid refrigerant injection.
Summary of Contents for TGH Series
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