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IOM 1372
WWW.DAIKINAPPLIED.COM
OPERATION
Table 19: Critical Alarms
Screen Text
Trigger Condition
Low Evaporator
Pressure
Evaporator Pressure (or lowest Suction Pressure
if Evaporator Pressure Transducer is detected as
bad or disconnected) is less than Low Evaporator
Pressure Alarm Setpoint. Causes: Low or No
Evaporator Water Flow. Low refrigerant level in
evaporator. Incorrect setpoint value for leaving
water temperature.
High Condenser
Pressure
Condenser Pressure (or Highest Discharge Pres-
sure if Condenser Pressure Transducer is detected
as bad or disconnected) is greater than 160 PSI
Evaporator
Pressure Sen-
sor Fault
Evaporator Pressure Transducer and Suction
Pressure Transducer(s) are detected as bad or
disconnected
Condenser
Pressure Sen-
sor Fault
Condenser Pressure Transducer and Discharge
Pressure Transducer(s) are detected as bad or
disconnected
Evaporator Wa-
ter Flow Loss
An alarm occurs while Evaporator Flow is not de-
tected. Causes: Loss of evaporator flow, evapora-
tor pump off, evap head gasket leaking or missing,
sensor wiring fault, evaporator flow sensor failure
Condenser Wa-
ter Flow Loss
An alarm occurs while Condenser Flow is not de-
tected. Causes: Loss of condenser flow, condens-
er pump off, condenser head gasket leaking or
missing, sensor wiring fault, condenser flow sensor
failure
Evaporator
Pump Fault
Evaporator pump does not see flow for 60
seconds after turning on when evaporator pump
control is enabled.
Condenser
Pump Fault
Condenser pump does not see flow for 60
seconds after turning on when condenser pump
control is enabled.
Evaporator
Freeze Protect
Saturated Evaporator Temperature is less than
Evaporator Freeze Protection Setpoint while
chiller is OFF.
Causes: Low evaporator water flow rate, low
refrigerant in chiller.
Condenser
Freeze Protect
Saturated Condenser Temperature is less than
Condenser Freeze Protection Setpoint while
chiller is OFF.
Causes: Low condenser water flow rate, low
refrigerant in chiller.
MicroTech OF-
FLINE Error
The MicroTech on the compressor controller is
offline (no comm/power)
MicroTech Con-
figuration Error
The MicroTech on the compressor controller has a
configuration error
VFD Communi-
cations Fault
Communication between the compressor controller
and the VFD are interrupted
MBC Communi-
cations Fault
Communication between the compressor controller
and the MBC are interrupted
Low Suction
Pressure
Suction Pressure is less than Low Suction Pres-
sure setpoint and Suction Pressure Warning is not
active
High Discharge
Pressure
Discharge pressure > High Discharge Pressure
SP. Causes: Low or No Condenser Water Flow
Discharge Tem-
perature High
Discharge Pressure is greater than 160 PSI and
Discharge Pressure Sensor Warning is not active.
Causes: Low or No Condenser Water Flow
High Motor
Winding Tem-
perature
One of the motor winding temperatures is greater
than 298 F. Causes: Motor stator cooling solenoid
not open, rotor cooling stepper motor not func-
tioning correctly, motor rotor superheat or gain
setpoints incorrect (contact factory)
Screen Text
Trigger Condition
High Motor Gap
Temperature
Motor Gap Temperature is greater than 130F
Max RLA Ex-
ceeded
VFD Output exceeds 115% of Nameplate RLA
Setpoint
Motor Gap Tem-
perature Sensor
Fault
Motor Gap Temperature Sensor is detected as bad
or disconnected
Rotor Pump
Temperature
Sensor Fault
Rotor Pump Temperature Sensor is detected as
bad or disconnected
Motor Winding
Temperature
Sensor Fault
All Motor Winding Temperature Sensors are de-
tected as bad or disconnected
High Suction
Temperature
Fault
Suction Temperature is greater than 125F and
Suction Temperature Sensor Warning is not active
High Discharge
Temperature
Fault
Discharge Temperature is greater than 150F and
Discharge Temperature Sensor Warning is not
active
VFD Fault
A Fault occurs from the VFD
MBC Fault
A Fault occurs from the MBC
Table 20: Warning Alarms
Screen Text
Trigger Condition
Evaporator
Pressure Sen-
sor Warning
Evaporator Pressure Transducer is detected as
bad or disconnected but there are valid Suction
Pressure Transducer(s) detected
Condenser
Pressure Sen-
sor Warning
Condenser Pressure Transducer is detected as
bad or disconnected but there are valid Discharge
Pressure Transducer(s) detected
Motor Case
Temperature
Sensor Warn-
ing
Motor Case Temperature Sensor is detected as
bad or disconnected
Motor Winding
Temperature
Sensor Warn-
ing
Two of the Motor Winding Temperature Sensors
are detected as bad or disconnected
Suction Tem-
perature Sen-
sor Warning
Suction Temperature Sensor is detected as bad or
disconnected
Discharge Tem-
perature Sen-
sor Warning
Discharge Temperature Sensor is detected as bad
or disconnected
Suction Pres-
sure Sensor
Warning
Suction Pressure Sensor is detected as bad or
disconnected
Discharge
Pressure Sen-
sor Warning
Discharge Pressure Sensor is detected as bad or
disconnected
MBC Warning
A Warning occurs from the MBC