For e.g. If the 5 LED’s display as follows : D1 ( Blink) , D2 (On) , D3 (On) , D4 (Blink ), D5 (On) ,
then this is an indication of a potential Liquid Floodback situation. In this case, the Refrigeration
Technician who responses to the Diagnostic alarm will save valuable time and go straight for the
root cause of the issue, an iced-up evaporator due to defrost malfunction , faulty evaporator fan ,
faulty or oversized TXV or even wrong evaporator selection ( to high Delta T for a LT Application )
The Diagnostic Module can be connected to a Remote Buzzer which alarms the recipient to a
potential issue with the CDU.
The ZX Defrost Module (Optional) is a Time-Initiated and Time-Terminated with Manual Button
to Override The Settings i.e. To Stop Or Start Defrost. A Remote Manual Defrost Button can also
be connected to the Defrost Module.
2.5 Advantages
The key advantages that the ZX CDU has over similar units is that it is extremely affordable and
has a very low noise level in comparison to other units on the market. To be cost effective and
more affordable the ZX CDU has Built-In Technology which includes the E2 Board with all the
programmed algorithms and the Diagnostic Module. The other key advantage is the Copeland
Compliant Scroll which has a Low Noise Level (60 dBA at 1m), Very Low Oil Carryover (About
0.2 % compared to Reciprocating systems that have a 2-3 % Oil Circulation Rate ), the Ability To
Withstand Substantial Liquid Floodback (Scroll Set) and finally a High Efficiency ( EER @ ARI MT
Rating Between 2.4 To 2.75)
2.6 The ZX Value Story
The Value of the ZX CDU based on the above can be summarized in to the Key Value Points as
11
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