MK/MV – Medium Profile Series Unit Coolers (E206993_M)
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KE2 OEM EVAP TROUBLESHOOTING CHART
Table 17 KE2 TROUBLESHOOTING
Alarm
Alarm
Name
Description
Parameter in VARIABLES menu to
diagnose further.
Corrective Action
Blank
Display
N/A
No LEDs are illuminated
on the display.
N/A
Note:
While not an alarm condition, the controller may or may not be opera-
tional if nothing is shown on the Remote Display. The KE2 Evap OEM can con-
tinue to operate the system even while the Remote Display is disconnected.
If controller is still powered and system is running troubleshoot the Re-
mote Display:
• Make sure the plugs are fully inserted into the jacks at both the KE2 Evap
OEM and the Remote Display.
• Check the connection between the KE2 Evap OEM board and the Remote
Display for any burned, chaffed, cut or otherwise damaged sections. If dam-
aged, replace cable.
• There are two jacks on the Remote Display. Switch the jack used on the Re-
mote Display and check for functionality.
• Check to see if Remote Display cable is longer than 5ft. Maximum cable
length between Remote Display and KE2 Evap OEM board is 5ft.
If system is not running and there are no LEDs lit on the KE2 Evap OEM
board, check:
• Incoming voltage to the board. Voltage should be between 100VAC –
240VAC, if not address supply voltage issue.
• Remove power to controller and check fuse located on board. The fuse can-
not be checked visually; remove fuse from board and check resistance across
the fuse. An open reading indicates the fuse has blown and points to a sup-
ply voltage issue or short on the board or connected devices. The fuse will
blow in order to protect the controller from permanent damage. Check for
proper incoming power, examine all cables for burned, cut, chaffed or other-
wise damaged insulation/wire and repair. Replace fuse (PN 21375).
• Remove all connections to controller except for power and the Remote Dis-
play; see if the Remote Display illuminates.
Note:
Power injected into the controller’s Ethernet port may reuslt in the dis-
play going blank and other unexpected problems.
Power over Ethernet (POE) switches connected to the KE2 Evap OEM should
have the power output feature disabled.
Ed
Intro
“Ed” is blinking on the
Remote Display, yel-
low and red LEDs are
flashing.
N/A
Not an alarm condition, controller is in introduction mode. Please refer to
Q.1.45 for controller setup.
PSA
Pressure
Sensor
Alarm
ONLY ACTIVE WHEN
AN ELECTRONIC
EXPANSION VALVE IS
SELECTED:
Suction pressure sensor
is shorted, open or
pressure is out of range.
Red LED is illuminated.
System cannot operate while this alarm
is present.
PrS - SUCTION PRESSURE
• If wiring connects Signal terminal (G)
to Ground terminal (B) or open, PrS will
read -15.
•If wiring connects Signal terminal (G) to
the +5 VDC terminal (R), PrS will read 154.
• If actual pressure is over the range of the
transducer, PrS will read over 150*.
* 300 psig or 500 psig depending on
range of the pressure transducer.
The majority of sensor alarms and inaccurate readings are caused by cut,
burned, chaffed or otherwise damaged sensor cables. Inspect the length of
the cable for any burned, chaffed or otherwise damaged sections. Repair any
damaged sections; take care not to swap colors when repairing.
• Check that the pressure transducer cable wires are inserted into the proper
position on the board (gray connector) and that the colors are inserted into
the proper screw down terminal gates. The bare stranded wire of the trans-
ducer cable should be inserted so that the wire is directly touching the gate
of the connector. If the gate is contacting the insulation of the wire, it will not
allow the controller to read the sensor.
• If wires have been extended, check that colors have not been swapped when
extended. Check for any bad splices, crimps or solder joints where extended.
• Check that the pressure transducer cable is fully inserted into the pressure
transducer. The cable should click when fully inserted into the transducer.
• Confirm that the proper transducer is being used for the system. 0-150psia
for most common refrigerants, 0-300psig for R-410A and 0-500psig for R-744
(CO2). Confirm that the proper refrigerant
(rFG)
is selected in the setpoints
menu.
• To verify the accuracy of the transducer, remove the transducer from the
system. The controller should read suction pressure as approximately 0 psig
when measuring atmosphere.
Note:
If PrS shows -15 when transducer is measuring atmosphere, the wrong
pressure transducer/refrigerant combination has been selected.
