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IOM 1297
WWW.DAIKINAPPLIED.COM
OPERATION
Table 15: Critical Alarms
Screen Text
Trigger Condition
Low Evapora-
tor Pressure
Evaporator Pressure (or lowest Suction Pressure
if Evaporator Pressure Transducer is detected
as bad or disconnected) is less than Low Evap-
orator Pressure Alarm Setpoint. Causes: Low or
No Evaporator Water Flow. Low refrigerant level
in evaporator. Incorrect setpoint value for leaving
water temperature.
High Condens-
er Pressure
Condenser Pressure (or Highest Discharge Pres-
sure if Condenser Pressure Transducer is detected
as bad or disconnected) is greater than 35 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
Water Flow
Loss
An alarm occurs while Evaporator Flow is not de-
tected. Causes: Loss of evaporator flow, evaporator
pump off, evap head gasket leaking or missing,
sensor wiring fault, evaporator flow sensor failure.
Condenser
Water Flow
Loss
An alarm occurs while Condenser Flow is not
detected. Causes: Loss of condenser flow, con-
denser 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 refrig-
erant 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 refrig-
erant in chiller.
MicroTech OF-
FLINE Error
The MicroTech on the compressor controller is
offline (no comm/power).
MicroTech
Configuration
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 Commu-
nications Fault
Communication between the compressor controller
and the MBC are interrupted.
Low Suction
Pressure
Suction Pressure is less than Low Suction Pressure
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
Temperature
High
Discharge Pressure is greater than 35 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 150 F. Causes:Low condenser subcooling.
Max RLA
Exceeded
VFD Output exceeds 115% of Nameplate RLA
Setpoint.
Screen Text
Trigger Condition
Motor Winding
Temperature
Sensor Fault
All Motor Winding Temperature Sensors are detect-
ed as bad or disconnected.
High Suction
Temperature
Fault
Suction Temperature is greater than 125F and Suc-
tion 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 16: 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 Winding
Tempera-
ture Sensor
Warning
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
Tempera-
ture Sensor
Warning
Discharge Temperature Sensor is detected as bad
or disconnected.
Suction Pres-
sure Sensor
Warning
Suction Pressure Sensor is detected as bad or
disconnected.
Stage 2 Suc-
tion Tempera-
ture Sensor
Warning
Discharge Temperature Sensor is detected as bad
or disconnected.
Stage 2
Discharge
Tempera-
tureSensor
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.
