McQuay WSC Operating Manual page 28

ALARMS Setpoint
Figure 16, ALARMS Setpoint Screen
Table 14, ALARM Setpoints
Description
Low Net Oil Pressure
Low Oil Delta Temperature
High Oil Feed Temperature
Condenser Freeze
Evaporator Freeze
Motor Current Threshold
Surge Slope Limit
Surge Temperature Limit
High Discharge Temp-
Shutdown
High Discharge Temp-Load
High Condenser Pressure
Low Evap Pressure, Stop
Low Evap Pressure-Unload
Low Evap Pressure-Inhibit
28
No. Default Range
14 50 psi 50 to 90 psi
13
40 °F 20 to 80 °F
12 140 °F 120 to 240 °F
11
34.0 °F -9.0 to 45.0 °F
10
34.0 °F -9.0 to 45.0 °F
9 10% 3% to 99%
8 20 1 – 99 deg F/min.
7 6 2 – 25 deg F
6
190 °F 120 to 240 °F
5 170 °F 120 to 240 °F
4 140 psi 120 to 290 psi
3 29 psi 10 to 45 psi
2 31 psi 20 to 45 psi
1 33 psi 20 to 45 psi
Pass-
Comments
word
T Min net pressure (feed minus sump)
T Min Delta-T (sat evap minus oil temp)
T Max oil temperature
T Minimum cond. sat. temp. to start pump
T Minimum evap. sat. temp. to start pump
T Min %RLA to consider motor off
T Surge slope temp that triggers alarm
T See screen above
Max discharge gas temp, stop
T
compressor
T Max discharge gas temp – load comp
Max discharge pressure, stop
T
compressor
T Min evap pressure – stop compressor
T Min evap pressure – unload compressor
T Min evap pressure – inhibit loading
OM Centrif Micro ΙΙ-5