Product manual

2
ZX – reliability platform
Emerson Climate Technologies has designed the ZX platform CDUs with extended operational capability in tough climatic conditions.
With our vast experience in the refrigeration industry, ZX platform CDU is designed with a good protection scheme. ZX protection
scheme detect conditions that could cause damage to the compressor, initiates a warning, temporary shutdown and auto restarts. The
control system will allow a complete shutdown requiring manual restart only after several iterations of repeated warnings and temporary
shutdowns are carried out. The control system is driven by the built-in “E2 Controller”. Figure 01 shows the control strategy of the E2
Controller in a schematic form.
ZX – performance platform
Emerson Climate technologies with its leadership in scroll compression technology, apply the most advanced techniques to maximize the
possible operational efficiency at specific application envelopes.
ZX MT CDU applies a patented suction-line injection technology. Scroll compressor inherently operates at higher efficiency at MT application
conditions. The suction-line injection provides a more reliable MT operating envelope. ZX MT CDU applies ZX series scroll compressor
with liquid injection into the suction-line using an electronic expansion valve (EXV). The EXV maintains an optimum feed of partially
vaporized liquid refrigerant in the compressor suction to maintain a safe discharge gas temperature. The controlled discharge gas
temperature provides a more reliable solution for the MT envelope.
ZX LT CDU applies vapor injection technology to achieve higher efficiency in LT refrigeration. Vapor injection allows an economizer cycle to
be applied on a scroll compressor thereby greatly enhancing compressor efficiency. This technology can be likened to 2- stage compression
with economizer cycle. Vapor injection improves efficiency by as much as 12% over a liquid injection system of the same type. ZX LT CDU
applies ZXI series vapor injected compressor with vapor injection plate heat exchanger (PHE) to implement the vapor injection technology.
Real Time Monitoring
Of CDU Conditions
Warning Mode
Temporary Shutdown,
Signal, Auto Restart
Lock Out Mode
Alarm, Dialer Relay
Activation, Manual Restart
Figure 01
Hours
Low Ambient High Ambient
Figure 02
ZX – design platform
The ZX platform CDU’s are designed to provide best
operational cost savings on year around basis. Refrigeration
equipments operate continuously all 7 days, 24 hours and
365 days. The ZX and ZXI compressors, injection scheme
and heat exchanger designs are optimized to provide best
efficiencies at annual averaged temperature rather than
at the typical rating conditions. The typical ambient on
an annual basis follows a normal distribution pattern. The
highest and lowest ambient happens only for few hours
as shown in figure 02.