Advertisement
Q.1.61 January 2023
Page 8
KE2 EvapOEM
Alarm Troubleshooting Guide
Troubleshooting Tables
Alarm & Alarm Name
Description
Basic
Combo
Web-
Display
Display
pages
HSH
HIGH SU-
High Su-
Yellow LED is
HSH
PERHEAT
perheat
illuminated.
Alarm
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.
LSH
LOW SU-
Low Su-
Yellow LED is
PERHEAT
perheat
illuminated.
LSH
Alarm
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.
© Copyright 2023 KE2 Therm Solutions, Inc., Washington, Missouri 63090
Variables & Setpoints Corrective Action
• Check the system suction pressure using either the Basic Display (PrS), or the con-
Variables
troller's browser interface. Validate the suction pressure is within the range of the system
SHt - Superheat
PrS - Suction Pressure
design. If a new install, confirm valve is properly sized for the system under all operating
SUt - Suction Temp
conditions.
oPn - Valve % Open
• Check refrigerant type. Press and hold
Setpoints
ant). Press
rFG - Refrigerant
until the correct refrigerant is shown. Press and hold
Edt - Expansion Device
Type
type. To exit the menu press
Refrigerants
Abbreviation Full Name
• Check valve type. Press and hold
vice type). Press
until the correct valve is shown. Press and hold
firm proper system operation with the variables menu.
Valve Types
Basic Display
Abbreviation
tHr
PLS
rS
SEi
SEr
CrL
• 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
the right most number blinking displays. This is the valve percent open, and the EEV
is now under manual control. 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.
until tS appears. Press
to see the currently selected refrigerant. To change refrigerant press
.
Abbreviation
R22
R-22
134
R-134a
42d
R-422D
42A
R-422A
40C
R-407C
40A
R-407A
507
R-507
404
R-404A
458
R-458A
513
R-513A
450
R-450A
until tS appears. Press
to see currently selected valve. To change the valve type press
KE2 Combo Display
Description
Scrolling Text
MECHANICAL
tHr
Thermostatic Expansion Valve (TEV).
PULSE VALVE
Pulse Width Modulation (PWM) Valve.
PLS
KE2 RSV
KE2 Therm's Refrigeration Stepper Valve.
rS
12VDC Bipolar Sporlan EEV with 1,600
SER/SEI 1 TO 20
SE
i
max steps, 200 steps/second.
12VDC Bipolar Sporlan EEV with 2,500
SER AA TO L
SEr
max steps, 200 steps/second.
12VDC Bipolar Carel EEV with 480 max
CAREL
CrL
steps, 50 steps/second.
and
at the same time on the Basic Display until a number with
to open and
to rFG (refriger-
to save correct refrigerant
Full Name
449
R-449A
448
R-448A
744
R-744
410
R-410A
407
R-407F
409
R-409A
408
R-408A
438
R-438A
717
R-717
452
R-452A
to Edt (expansion de-
to save. Controller will reboot. Con-
to close the valve. Press
21214V3.0
Advertisement
