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OPERATION
Table 15: Critical Alarms
Screen Text
Trigger Condition
Evaporator Pressure (or lowest Suction Pressure
if Evaporator Pressure Transducer is detected
as bad or disconnected) is less than Low Evap-
Low Evapora-
orator Pressure Alarm Setpoint. Causes: Low or
tor Pressure
No Evaporator Water Flow. Low refrigerant level
in evaporator. Incorrect setpoint value for leaving
water temperature.
Condenser Pressure (or Highest Discharge Pres-
High Condens-
sure if Condenser Pressure Transducer is detected
er Pressure
as bad or disconnected) is greater than 35 PSI.
Evaporator
Evaporator Pressure Transducer and Suction
Pressure Sen-
Pressure Transducer(s) are detected as bad or
sor Fault
disconnected.
Condenser
Condenser Pressure Transducer and Discharge
Pressure Sen-
Pressure Transducer(s) are detected as bad or
sor Fault
disconnected.
An alarm occurs while Evaporator Flow is not de-
Evaporator
tected. Causes: Loss of evaporator flow, evaporator
Water Flow
pump off, evap head gasket leaking or missing,
Loss
sensor wiring fault, evaporator flow sensor failure.
An alarm occurs while Condenser Flow is not
Condenser
detected. Causes: Loss of condenser flow, con-
Water Flow
denser pump off, condenser head gasket leaking or
Loss
missing, sensor wiring fault, condenser flow sensor
failure.
Evaporator pump does not see flow for 60 seconds
Evaporator
after turning on when evaporator pump control is
Pump Fault
enabled.
Condenser pump does not see flow for 60 seconds
Condenser
after turning on when condenser pump control is
Pump Fault
enabled.
Saturated Evaporator Temperature is less than
Evaporator Freeze Protection Setpoint while chiller
Evaporator
is OFF .
Freeze Protect
Causes: Low evaporator water flow rate, low refrig-
erant in chiller.
Saturated Condenser Temperature is less than
Condenser Freeze Protection Setpoint while chiller
Condenser
is OFF .
Freeze Protect
Causes: Low condenser water flow rate, low refrig-
erant in chiller.
MicroTech OF-
The MicroTech on the compressor controller is
FLINE Error
offline (no comm/power).
MicroTech
The MicroTech on the compressor controller has a
Configuration
configuration error.
Error
VFD Communi-
Communication between the compressor controller
cations Fault
and the VFD are interrupted.
MBC Commu-
Communication between the compressor controller
nications Fault
and the MBC are interrupted.
Suction Pressure is less than Low Suction Pressure
Low Suction
setpoint and Suction Pressure Warning is not
Pressure
active.
High Discharge
Discharge pressure > High Discharge Pressure SP.
Pressure
Causes: Low or No Condenser Water Flow.
Discharge
Discharge Pressure is greater than 35 psi and
Temperature
Discharge Pressure Sensor Warning is not active.
High
Causes: Low or No Condenser Water Flow.
High Motor
One of the motor winding temperatures is greater
Winding Tem-
than 150 F. Causes:Low condenser subcooling.
perature
Max RLA
VFD Output exceeds 115% of Nameplate RLA
Exceeded
Setpoint.
IOM 1297
Screen Text
Trigger Condition
Motor Winding
All Motor Winding Temperature Sensors are detect-
Temperature
ed as bad or disconnected.
Sensor Fault
High Suction
Suction Temperature is greater than 125F and Suc-
Temperature
tion Temperature Sensor Warning is not active.
Fault
High Discharge
Discharge Temperature is greater than 150F and
Temperature
Discharge Temperature Sensor Warning is not
Fault
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
Evaporator Pressure Transducer is detected as
Pressure Sen-
bad or disconnected but there are valid Suction
sor Warning
Pressure Transducer(s) detected.
Condenser
Condenser Pressure Transducer is detected as
Pressure Sen-
bad or disconnected but there are valid Discharge
sor Warning
Pressure Transducer(s) detected.
Motor Winding
Two of the Motor Winding Temperature Sensors
Tempera-
are detected as bad or disconnected.
ture Sensor
Warning
Suction Tem-
Suction Temperature Sensor is detected as bad or
perature Sen-
disconnected.
sor Warning
Discharge
Discharge Temperature Sensor is detected as bad
Tempera-
or disconnected.
ture Sensor
Warning
Suction Pres-
Suction Pressure Sensor is detected as bad or
sure Sensor
disconnected.
Warning
Stage 2 Suc-
Discharge Temperature Sensor is detected as bad
tion Tempera-
or disconnected.
ture Sensor
Warning
Stage 2
Suction Pressure Sensor is detected as bad or
Discharge
disconnected.
Tempera-
tureSensor
Warning
Discharge
Discharge Pressure Sensor is detected as bad or
Pressure Sen-
disconnected.
sor Warning
MBC Warning
A Warning occurs from the MBC.
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