ZX Platform Condensing Unit
16
Fault Type
Trip Set Point
E2 Control Actions
Auto Resets
Possible Error And Solution
Reverse Phase /
Loss Of Phase
(3 Phase Only)
Incorrect voltage
Sequence
- Lockout unit
- Display Incorrect Phase Sequence on
diagnostic
- Initiate Buzzer/ Dialer Relay
Unit will not
start unless it is
wired correctly
- Change voltage sequence at
circuit break.
- Check voltage sequence of the
compressor;
Fresh Start
If power is reset,
ambient < 35°C
or compressor off>
1 hour & signal for
compressor start
- Compressor runs 3 sec and stops 20 sec
- After 3 cycles, compressor runs
continuously.
- Display fresh start on diagnostic
Auto start
- Nothing is wrong, just wait till
compressor runs continuously.
High Pressure
Trip
Contact Open At
3.0 ±0.15Mpa
Contact Close At
2.4±0.15Mpa
- Stop the unit
- Display HP trip on diagnostic
- Display waiting to restart on diagnostic
- Auto start the unit after 3 minutes
- Lockout unit if 6 trips in less than 1 hour
- Display HP lockout on diagnostic
-Initiate Buzzer/ Dialer Relay
5 Auto starts in
1 Hour
- Check whether HP cutout is
functioning or is connected to
control board;
-Check whether condenser fan can
run;
-Check if the liquid line solenoid
valve and liquid service valve are
open.
Low Pressure Trip
(Only in Med Temp
Unit)
Contact Open At
0.1±0.05Mpa
Contact Close At
0.2 ±0.05Mpa
-Stop the unit
- Display LP trip on diagnostic
- Display waiting to restart on diagnostic
- Auto start the unit after 3 minutes
Auto Start
- Check whether evaporator need
defrosting
- Check that return gas service valve
is open;
- Check that LP cutout is functioning
or is connected to control board
(1 second)-
>
- Power On
- Unit Identification Code
- Software Version No.
(3 seconds)->
(3 seconds)->
“F”-With OD Fan Speed Control; “-”- W/O OD Fan Speed Control
“-” - ZX; “L” - ZXL
LED 2
LED 1
Diagnostic Initialization Message (ZX-MT and ZXL-LT)
When the unit is initially powered on, the diagnostic module will show the following signals.
E2 Controller Trip Set Points and Actions (ZX-MT and ZXL-LT Units)
LED1-Unit Status
LED2-Error/Warning Code
Display
Status
Display
Error/Warning
Idle (Stop When Reach To
Set-point)
No error/warning
Run
Compressor Phase Error (Wrong Phase Sequence/Loss of
Phase)
About To Start
Compressor Inside Thermal Protector Trip
Defrost
Compressor Over Current
Stop Due to Error
Overheat
Lockout
Compressor High Pressure Cut Out
Compressor Low Pressure Cut Out
DLT Thermistors Failure
Ambient Temperature Sensor Failure
Mid-coil Temperature Sensor Failure
PHE Vapor In Temperature Sensor Failure or Over Range
PHE Vapor Out Temperature Sensor Failure or Over Range
System Liquid Flood Back Warning
Notes:
New start, normal start by program and any
start request delay
LP Cutout”signal is not applicable in ZXL
condensing unit.
PHE Vapor In/Out temperature sensor is
not applicable in ZX medium temperature
condensing unit.
1
2
3
1
Diagnostic messaging - LED definition (ZX-MT and ZXL-LT)
2
3
3
