KE2 Evap
OEM
Alarm Troubleshooting Guide
Q.1.61 January 2023
Page 8
© Copyright 2023 KE2 Therm Solutions, Inc., Washington, Missouri 63090
21214V3.0
Troubleshooting Tables
Alarm & Alarm Name
Description
Variables & Setpoints Corrective Action
Basic
Display
Combo
Display
Web-
pages
HSH
HSH
HIGH SU-
PERHEAT
High Su-
perheat
Alarm
Yellow LED is
illuminated.
Controller will
attempt to continue
to operate system
while this alarm is
present.
[EEV] Superheat
reading 2°F above
superheat setpoint
for 90 minutes of
cumulative runtime,
and valve > 90%
open.
[TEV] Superheat
reading above
superheat setpoint
for 90 minutes of
cumulative runtime.
Variables
SHt - Superheat
PrS - Suction Pressure
SUt - Suction Temp
oPn - Valve % Open
Setpoints
rFG - Refrigerant
Edt - Expansion Device
Type
• Check the system suction pressure using either the Basic Display (PrS), or the con-
troller’s browser interface. Validate the suction pressure is within the range of the system
design. If a new install, confirm valve is properly sized for the system under all operating
conditions.
• Check refrigerant type. Press and hold
until tS appears. Press
to rFG (refriger-
ant). Press
to see the currently selected refrigerant. To change refrigerant press
until the correct refrigerant is shown. Press and hold
to save correct refrigerant
type. To exit the menu press
.
• Check valve type. Press and hold
until tS appears. Press
to Edt (expansion de-
vice type). Press
to see currently selected valve. To change the valve type press
until the correct valve is shown. Press and hold
to save. Controller will reboot. Con-
firm proper system operation with the variables menu.
• If system operation has not improved, re-initialize the valve. This can be done by click-
ing the “Reboot” button on the Setpoints page under General Information in the brows-
er interface, or power may be cycled to the controller.
• Check the valve position in the variables menu (oPn). If the valve is fully open, verify
the valve is operating properly by manually operating the valve from the Basic Dis-
play. Press
and at the same time on the Basic Display until a number with
the right most number blinking displays. This is the valve percent open, and the EEV
is now under manual control. Press
to open and to close the valve. Press
momentarily to change how much the valve opens with each button press (0.1%, 1.0%
or 10.0%). The valve should start to move immediately to the position indicated on the
display. While verifying suction pressure either from the controller’s browser interface
or with gauges, begin closing the valve 10.0% at a time. The suction pressure should
decrease somewhat with each 10% closure. Completely close the valve to 0.0%; system
should pump down. If suction pressure responds to closing the valve, valve should be
operating correctly and a system issue is likely present: low charge, restriction in the
liquid line, dirty condenser etc. If suction pressure does not respond to manually oper-
ating the valve, proceed to next step.
LSH
LSH
LOW SU-
PERHEAT
Low Su-
perheat
Alarm
Yellow LED is
illuminated.
Controller will
attempt to continue
to operate system
while this alarm is
present.
Superheat reading
below 3°F for 5
minutes and EEV <
10% open if EEV is
selected.
Refrigerants
Abbreviation Full Name
Abbreviation Full Name
R22
R-22
449
R-449A
134
R-134a
448
R-448A
42d
R-422D
744
R-744
42A
R-422A
410
R-410A
40C
R-407C
407
R-407F
40A
R-407A
409
R-409A
507
R-507
408
R-408A
404
R-404A
438
R-438A
458
R-458A
717
R-717
513
R-513A
452
R-452A
450
R-450A
Valve Types
Basic Display
KE2 Combo Display
Description
Abbreviation Scrolling Text
tHr
tHr
MECHANICAL
Thermostatic Expansion Valve (TEV).
PLS
PLS
PULSE VALVE
Pulse Width Modulation (PWM) Valve.
rS
rS
KE2 RSV
KE2 Therm’s Refrigeration Stepper Valve.
SEi
SE
i
SER/SEI 1 TO 20
12VDC Bipolar Sporlan EEV with 1,600
max steps, 200 steps/second.
SEr
SEr
SER AA TO L
12VDC Bipolar Sporlan EEV with 2,500
max steps, 200 steps/second.
CrL
CrL
CAREL
12VDC Bipolar Carel EEV with 480 max
steps, 50 steps/second.