Product manual

The E2 controller consists of 2 electronic board assemblies: E2 power board and control
board. The power board supplies constant DC power to the E2 control board. The E2
control board carries the intelligent chip containing the canned programs. The entire
assembly is pre-installed and wired in the factory on a new unit. Both electronic boards
carry a LED light (refer fig 9 in which the LED on both boards are identified). If the LED lights
are on after power-up of the unit, it indicates normal and proper operation of the electronic
boards. Once these lights are on, the rest of the unit including the compressor is
monitored and digital messages are shown on the diagnostic panel.
Table 01 shows a list of fault detections enabled by E2 controller and diagnostics on ZX
platform CDU. The diagnostics are standard features on the Emerson ZX platform Gold
version.
The table 02 summarizes fault conditions under which the E2 controller initiates “temporary
shutdown—with-auto-restart” and “lock-out trip-condition with- manual-restart”
9
Emerson ZX Platform Condensing Unit
PRODUCT MANUAL
Table 01
• High Pressure Cut Out
• Loss Of Phase (In 3 Phase Models)
• Compressor Minimum Off Time
• E2 Sensor Failures
• Excessive Refrigerant Flood Back
• Low Pressure Cut Out (MT CDU Only)
• Discharge Gas Temperature Over Heat
• Compressor Protector Trip Detection
• Compressor Over Current
• Compressor Phase Reversal
E2 Fault Detection Items
The E2 control is also designed to apply a ZX
defrost (DF) module. The ZX DF module is a
basic time initiated DF module. The defrost
module is supplied as an optional accessory.
The DF module has two rotary switches by
which the user can set up the defrost duration
and defrost interval. The DF module also
enables a manual defrost as an override to the
rotary switch setting of defrost interval. Figure
11 shows the defrost module
Phase Reversal/ Loss Of Phase
High Pressure Trip
Low Pressure Trip (only on MT Units)
Discharge Gas Temperature Overheat
Compressor Over Current
Compressor Short Cycling
Excessive Suction Flood Back
Discharge Sensor Failure (only on LT Units)
Other Thermal Sensor Failures
< 5 Trips In 1 Hour
At Every LP Trip
< 5 Trips In 1 hour
< 5 Trips In 1 Hour
3 Minutes Between Starts
~
20% Flood Back, Warning Only
< 5 Trips In 1 Hour
Warning Only
Incorrect 3 Phase Sequence
6
th
Trip Within 1 Hour
No Lock Out
6
th
Trip Within 1 Hour
6
th
Trip Within 1 Hour
No Lock Out
No Lock Out
6
th
Trip Within 1 Hour
No Lock Out
Fault
Temporary Shutdown/
Auto Restart
Lock Out Errors/
Manual Restarts
Table 02
Defrost Duration (in Minutes)
Defrost Interval
(In Hours)
E2 Connector
Manual Defrost
Button
Remote Connector
For Manual Defrost
Figure 11