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KE2 EvapOEM
Alarm Troubleshooting Guide
Troubleshooting Tables
Troubleshooting Tables
– KE2 Humidity Control Only
Alarm & Alarm Name
Alarm & Alarm Name
Basic
Basic
Combo
Combo
Web-
Web-
Display
Display
Display
Display
pages
pages
LHA
LHA
LOW
LOW
Low
Low
HUMIDITY
HUMIDITY
Humidity
Humidity
LHA
LHA
Alarm
Alarm
CHA
CHA
HUMIDITY
HUMIDITY
Humidity
Humidity
COMM
COMM
Comms
Comms
CHA
CHA
Alarm
Alarm
KE2 Evap OEM w/ High Side Control Only
KE2 Evap OEM w/ High Side Control Only
HdA
HdA
HIGH DISCH
HIGH DISCH
High
High
TEMP
TEMP
Disch
Disch
HdA
HdA
Temp
Temp
LCT
LCT
SYSTEM
SYSTEM
Comp
Comp
LOCKOUT
LOCKOUT
Locked
Locked
LCT
LCT
Out
Out
21214V3.0
Description
Description
Variables & Setpoints Corrective Action
Variables & Setpoints Corrective Action
Yellow LED is illumi-
Yellow LED is illumi-
Variables
Variables
nated. Controller will
nated. Controller will
HU – Humidity
HU – Humidity
attempt to continue
attempt to continue
Setpoints
Setpoints
to operate system
to operate system
HSP – Humidity Set-
HSP – Humidity Set-
while this alarm is
while this alarm is
point
point
present.
present.
HdP – Humidity Dif-
HdP – Humidity Dif-
Humidity reading is
Humidity reading is
ferential
ferential
below the Humidity
below the Humidity
UAo – Humidity Alarm
UAo – Humidity Alarm
Setpoint - Humidity
Setpoint - Humidity
Offset
Offset
Differen tial - Humid-
Differen tial - Humid-
UAd – Humidity Alarm
UAd – Humidity Alarm
ity Alarm Offset for
ity Alarm Offset for
Delay
Delay
longer than the Hu-
longer than the Hu-
Stt – (Min) Superheat
Stt – (Min) Superheat
midity Alarm Delay.
midity Alarm Delay.
tS – Room Temp Set-
tS – Room Temp Set-
point
point
Yellow LED is illumi-
Yellow LED is illumi-
HU - Humidity Mode
HU - Humidity Mode
nated. Controller will
nated. Controller will
attempt to continue
attempt to continue
to operate system
to operate system
while this alarm is
while this alarm is
present.
present.
KE2 Evap OEM lost
KE2 Evap OEM lost
communication with
communication with
KE2 Humidity Control
KE2 Humidity Control
board for 10 seconds.
board for 10 seconds.
Red LED is illumi-
Red LED is illumi-
Variables
Variables
nated. System cannot
nated. System cannot
AU1, AU2, AU3 – Dis-
AU1, AU2, AU3 – Dis-
operate while this
operate while this
charge Temp (any Aux
charge Temp (any Aux
alarm is present.
alarm is present.
Input can be set to
Input can be set to
Discharge Temp).
Discharge Temp).
Discharge temp
Discharge temp
reading above High
reading above High
Setpoints
Setpoints
Discharge Temp
Discharge Temp
Hdd – High Discharge
Hdd – High Discharge
setpoint for longer
setpoint for longer
Temp
Temp
than High Discharge
than High Discharge
HdL – High Discharge
HdL – High Discharge
Temp Delay.
Temp Delay.
Delay
Delay
Red LED is illuminat-
Red LED is illuminat-
Variables
Variables
ed. System cannot
ed. System cannot
AU1, AU2, AU3 – Dis-
AU1, AU2, AU3 – Dis-
operate while this
operate while this
charge Temp (any Aux
charge Temp (any Aux
alarm is present.
alarm is present.
Input can be set to
Input can be set to
Discharge Temp).
Discharge Temp).
In one hour system
In one hour system
cycled off on high
cycled off on high
Setpoints
Setpoints
discharge temp more
discharge temp more
Hdd – High Discharge
Hdd – High Discharge
times than Max Num-
times than Max Num-
Temp
Temp
ber of Starts setpoint.
ber of Starts setpoint.
HdL – High Discharge
HdL – High Discharge
Delay
Delay
NSt – Max Number of
NSt – Max Number of
Starts
Starts
• The humidity sensor should be located in an area representative of the controlled
• The humidity sensor should be located in an area representative of the controlled
space. An area with poor air movement may provide an unusually low humidity read-
space. An area with poor air movement may provide an unusually low humidity read-
ing. The senor must be placed with the metal cylinder in the downward direction to
ing. The senor must be placed with the metal cylinder in the downward direction to
read accurately.
read accurately.
• Confirm that any dehumidification, humidification, and/or reheat devices are operat-
• Confirm that any dehumidification, humidification, and/or reheat devices are operat-
ing as expected.
ing as expected.
• Confirm Electric Expansion Valve (EEV) and refrigeration system is operating as ex-
• Confirm Electric Expansion Valve (EEV) and refrigeration system is operating as ex-
pected. See High/Low Superheat Alarm corrective actions for troubleshooting the
pected. See High/Low Superheat Alarm corrective actions for troubleshooting the
EEV.
EEV.
• Decrease the Superheat setpoint to decrease runtime. Do not allow superheat at the
• Decrease the Superheat setpoint to decrease runtime. Do not allow superheat at the
compressor to go below the manufacturer's recommended minimum.
compressor to go below the manufacturer's recommended minimum.
• For systems with electric defrost, decrease the number of defrosts per day or switch
• For systems with electric defrost, decrease the number of defrosts per day or switch
to demand defrost. If number of defrosts is still high, see Excess Defrost corrective
to demand defrost. If number of defrosts is still high, see Excess Defrost corrective
actions.
actions.
• Review room temperature to see if room temp setpoint can be raised slightly. The
• Review room temperature to see if room temp setpoint can be raised slightly. The
controller keeps a tighter temperature band than typical mechanical thermostats.
controller keeps a tighter temperature band than typical mechanical thermostats.
• If system is otherwise operating as expected, consider adding humidification to the
• If system is otherwise operating as expected, consider adding humidification to the
space.
space.
• If you believe the humidity reading may be in error, proceed to troubleshooting steps
• If you believe the humidity reading may be in error, proceed to troubleshooting steps
for Humidity Sensor Alarm.
for Humidity Sensor Alarm.
• Check to make sure the KE2 Humidity Control is powered up and both the KE2 Hu-
• Check to make sure the KE2 Humidity Control is powered up and both the KE2 Hu-
midity Control and KE2 Evap OEM have proper incoming voltage.
midity Control and KE2 Evap OEM have proper incoming voltage.
• Confirm the RS-485 connection between the KE2 Evap OEM and KE2 Humidity Con-
• Confirm the RS-485 connection between the KE2 Evap OEM and KE2 Humidity Con-
trol. The "A" terminal on the KE2 Evap OEM board should be wired to the "A" terminal
trol. The "A" terminal on the KE2 Evap OEM board should be wired to the "A" terminal
on the KE2 Humidity Control. The "B" terminal on the KE2 Evap OEM board should be
on the KE2 Humidity Control. The "B" terminal on the KE2 Evap OEM board should be
wired to the "B" terminal on the KE2 Humidity Control. GND/SH should not be con-
wired to the "B" terminal on the KE2 Humidity Control. GND/SH should not be con-
nected at either end.
nected at either end.
• The bare stranded wire of the communication cable should be inserted so that the
• The bare stranded wire of the communication cable should be inserted so that the
wire is directly touching the gate of the connector. If the gate is contacting the insula-
wire is directly touching the gate of the connector. If the gate is contacting the insula-
tion of the wire, it will not allow communication.
tion of the wire, it will not allow communication.
• Check for any burned, cut, chaffed sections of the communications cable, repair or
• Check for any burned, cut, chaffed sections of the communications cable, repair or
replace the cable or damaged sections.
replace the cable or damaged sections.
• Switch the existing cable with Cat5e cable. Strip back the cable ends and use the
• Switch the existing cable with Cat5e cable. Strip back the cable ends and use the
blue & blue with white stripe twisted pair for the A & B connections.
blue & blue with white stripe twisted pair for the A & B connections.
• Confirm condenser fans are operating correctly.
• Confirm condenser fans are operating correctly.
• Clean condenser/remove any obstructions to proper airflow.
• Clean condenser/remove any obstructions to proper airflow.
• Confirm discharge sensor is reading properly.
• Confirm discharge sensor is reading properly.
• Confirm that Hdd and HdL setpoints are not set too low or short for the application.
• Confirm that Hdd and HdL setpoints are not set too low or short for the application.
Check manufacturer's recommendations for maximum discharge temperature.
Check manufacturer's recommendations for maximum discharge temperature.
• Follow compressor/refrigeration unit manufacturer's troubleshooting steps for high
• Follow compressor/refrigeration unit manufacturer's troubleshooting steps for high
discharge temperature.
discharge temperature.
• Proceed to corrective actions for High Disch Temp alarm.
• Proceed to corrective actions for High Disch Temp alarm.
• Must be manually cleared by clearing alarms or cycling power.
• Must be manually cleared by clearing alarms or cycling power.
© Copyright 2023 KE2 Therm Solutions, Inc., Washington, Missouri 63090
Q.1.61 January 2023
Page 17
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