2.3 Control Features
As mentioned earlier, the ZX CDU Control System evolves around the E2 Board and one of it’s
primary functions is the
Automatic Liquid Injection
system that ensures that the ZX Compressor
operates within a safe envelope. This is carried out with an injection of Liquid Refrigerant Into the
Scroll Suction, this process has a
global patent
on it. The Injection is based on measuring the
Scroll Head Temperatures
and sending that data to the E2 Board which has a built-in Algorithm
that converts this temperature signal specific digital instructions and sends to a Stepper Motor
Driving An EXV. The EXV accordingly supplies Liquid Refrigerant to keep the Compressor Head
Temperatures within Safe Levels.
Other Compressor Protection features are
Compressor Phase Reversal
(Scroll Compressor
Will Not Compress In Reverse ),
Voltage Imbalance Protection
,
Loss of Phase Protection
,
Motor Current Overload
(Built-In and therefore External Current Protection not Required ),
Non-Adjustable High And Low Pressure Switches
(Automatic Reset For Nos. Of Trips, Then
Lockout [For HP Only] And Require Manual Restart),
Liquid Floodback Protection
(Measurement of Discharge Superheat To Predict Liquid Floodback),
Fresh Start Programs
(To
Ensure Safe Start-Ups After Long Periods Of Inactivity) and the
Crankcase Heater
(Energized
When Compressor Stops)
Due to the
Condenser Fan Speed Control
Function, the Ambient Operating Range can be
reduced to
–30 C
which is useful in start-up and for operations during winter operation. The
ambient temperature below which Fan Speed Control Option is recommended is
25 C
.
The
Base Control
function
is
for
Connection
Of
Optional
/
Customer
Supplied Functions such as
Temperature Controller
or Thermostat,
Electric Defrost Heater
Contactor,
Evaporator Fan Contactor
, Output For
Dialer
, Compatibility With CPC’s Einstein
Control & Monitoring System (coming)
9
Summary of Contents for ZX
Page 8: ...Fig 4 The Defrost Module Fig 5 The Diagnostic Module now available without Buzzer 8 ...
Page 21: ...ZX200 300 400 Single Fan Units 21 ...
Page 22: ...ZX500 600 750 Dual Fan Units 22 ...
Page 43: ...Fig 23 Diagnostic Module and Defrost Module connected to the E2 Unit Controller 43 ...
Page 51: ...Addendum 17 2 ZX Wiring Diagram 51 ...
Page 52: ...Addendum 17 3 Capacity kW at 50Hz for Refrigerant R22 52 ...
Page 54: ...54 ...
