Fig 2. Dual Fan Unit
( ZX 500, ZX 600 & ZX 750 )
The fact that the Scroll Compressors are manufactured at either Copeland ‘s China or Thailand
plants means that the design initiatives have taken a low cost- high technology approach, the
ZX is a very affordably designed CDU.
With a large Coil, small Fan design coupled with Built-In Fan Speed Control (Optional), the ZX is
one of the Quietest Refrigeration CDU on the market.
As mentioned in the first paragraph, the ZX uses electronics extensively in its Protection,
Diagnostics and Communication features. These features are controlled by the E2 Electronics
Control Board. The E2 provides Base Control functions related to Temperature Controller,
Defrost, Evaporator Fan control etc., Compressor Protection e.g. Current Overload , Voltage
Imbalance, Anti – Phase Reversal etc. , Liquid Injection Control which keeps the discharge
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