www.DaikinApplied.com 55 IOM 1274-3 • CENTRIFUGAL WATER CHILLERS
Figure 68: Settings View - Alarms
Table 17: ALARMS Setpoint Settings
Description Default Range PW Comments
Condenser Freeze Protect 34.0 °F -9.0 to 45.0 °F T
Sets the value of condenser saturated temperature below which the condenser pump is forced
alarm - see
Evaporator Freeze Protect 34.0 °F -9.0 to 45.0 °F T
Sets the value of evaporator saturated temperature below which the evaporator pump is
limit alarm - see .
High Condenser Pressure 140 psi 120 to 270 psi T Sets the condenser pressure above which the compressor is shut down.
High Discharge Temp - Load 170 °F 120 to 240 °F T Discharge temp above which a forced capacity increase occurs.
High Discharge Temp - Stop 190 °F 120 to 240 °F T Discharge temp above which the compressor is shut down.
Low Suction Pressure - Inhibit 33 psi 7 to 45 psi T
Sets the evaporator pressure value below which any capacity increase is inhibited - may need
to be lowered if glycol is added to the system. Similarly, changing setpoint below 30 psi default
requires glycol to be added to the system otherwise there is a risk of freezing the evaporator.
Low Suction Pressure - Unload 31 psi 6 to 45 psi T Suction pressure value below which a forced capacity decrease occurs.
Low Suction Pressure - Stop 29 psi 5 to 45 psi T Suction pressure value below which compressor is shut down.
Motor Current Threshold 10% 3 to 99% T When % RLA is below setpoint, motor is considered OFF.
Surge Temp Limit 6 °F 2 to 25 °F T
Surge Temp (ST) = Suction Temp - Evap Leaving Temp, ST is compared to SP.
If LESS, alarm occurs when ST > 2x setpoint.
If MORE, slope alarm is active until ST < this setpoint, then alarm at 2x setpoint.
Surge Slope Limit 20 °F/min 1 to 99 °F/min T Sets Surge Temp Slope above which alarm occurs.
Lenient Flow Sensing T
alarm. When OFF, a trip timer for each vessel will determine timing allowed before issuing a
High Oil Feed Temp 140 °F 120 to 240 °F T Above limit, compressor shuts down.
Low Oil Delta Temp 30 °F 20 to 80 °F T
Delta Temp (above evaporator saturated temp); If value is below setpoint, compressor shuts
down.
Low Net Oil Pressure 50 psi 0 to 90 psi T
Net Oil Pressure (Feed pressure - sump pressure); If value is below setpoint, compressor
shuts down.
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