Product manual

ZX Platform E2 control features
ZX platform E2 control offers multiple features which are unique to refrigeration condensing units. E2 real-time control monitors and
optimizes the suction or vapor injection performance to offer efficient performance in ZX MT and LT units. E2 also monitors the
compressor operating parameters, so as to protect the system from unsafe operating parameters such as passing through a peak
temperature hour of a peak ambient day; or drop-out of a power-phase; or continued refrigerant loss in the system. E2 controller detects
these situations and, as a first step, will initiate some corrective actions.
ZX platform units are designed to operate under extreme ambient temperatures of up to 48 deg C. This extremely high-ambient envelope,
combined with the intelligent E2 controller, provides unparalleled benefits to customers.
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Emerson ZX Platform Condensing Unit
PRODUCT MANUAL
For example, when the LT unit experiences an extreme temperature day, E2 control decides to switch from vapor-injection-optimization
to discharge-gas temperature-control to allow the compressor to run safely and pass the extreme weather hours.
Another fault condition which is common in refrigeration systems is compressor overload. If the condenser coils are not cleaned
regularly, the compressor operating discharge pressures rises. This condition is gradual and in conventional CDU’s, no advance
warning is provided to the user on this approaching undesirable situation. Ultimately, in such a situation, the internal protector in
the compressor trips. Two problems arise due to internal protector-trip. First: there is no alarm to detect the trip and second: a
compressor internal protector reset may take as long as an hour. This could be critical for quality of frozen food in freezers or cases.
On the other hand, ZXL E2 controller detects the overload externally and actions a temporary shutdown. E2 Diagnostics will then
start transmitting a fault signal. After multiple attempts, and if the error repeats itself as high as six times within an hour, the E2 will
finally shutdown the unit to avoid expensive compressor failure.
The E2 will activate a buzzer to send an alarm signal at unit-lockout which then requires a manual restart. The buzzer is a standard
part for the ZX platform Gold version CDU . The buzzer can be remotely mounted and has volume and mute capability. The E2 is also
designed to activate an externally connected telephone dialer to send fault notice on a preset telephone number.