# Name Description
92 Unsafe DifPsi If active, the Magnum checks for unsafe differential oil pressure. If the calculated differential oil
pressure is less than this value for the specifi ed period of time, a lockout occurs. NOTE: The time
period specifi ed should be very short (3 to 5 seconds). If this Setpoint trips, the compressor will be sent
straight to the Lockout state.
Refers to ‘Oil Pressure’ column in the Circuit SI screen.
101 SAFETY HOLD Time in seconds that the circuit will remain in a hold state after the condition that caused it has returned
to normal. The circuit can be holding for the following reasons:
Low suction pressure
Low refrigerant temperature
High discharge pressure
High discharge temperature
High amperage
105 NO FLOW If active, fl ow is lost, and only one pump is present, then the system will be locked out. If the system
has two pumps and fl ow is lost, then the backup pump will start and the lead pump will be locked out. If
the second pump is running and fl ow is lost again then the entire system will be locked out. A lock out
reset will be required to restart the system or to reactivate a locked out pump.
If inactive, and the fl ow is lost, the system will move to the OFF- NO EVAP FLOW state. When fl ow is
returned the system will automatically restart.
If looking at individual pumps for each circuit in the Circuit base. Make this Setpoint a "Lockout". If
fl ow is not made within the value of this Setpoint the fi rst time than, an alarm will be generated. The
system counts through the value of this Setpoint a second time, if fl ow is made then the unit will run as
normal. If fl ow is not made the second time, the pump and all associated compressors for that circuit
will be locked out.
108 PUMP OFF DLAY Time in seconds to keep the chilled water pump running after the last compressor has been turned off
to ensure the chiller barrel does not freeze.
91 LOW DIF PSI Pressure differential between SUCT and DISCH. pressure is lower than this value, a safety trip occurs.
111 FREEZE If active, the Magnum will compare the leaving temperature to this Setpoint. If it is less than this value
for the specifi ed period of time, a safety trip occurs.
151 UNLOADED OFF If active, the system is fully unloaded and the control temperature is greater than this value, then the
capacity state will be set to holding.
‘Time (sec)’ fi eld: If non-zero, then the value of this Setpoint is used as a differential and not a set
temperature. The value of this Setpoint is subtracted from Setpoint #1.
153 SftyUnld DLY The time delay in seconds between compressor capacity adjustments when safety unloading.
154 SftyUnld Adj The VFD percentage adjustment to be made after every amount of time in Setpoint #153 “SftyUnld
Del” when safety unloading.
157 HP LoSuctAdj This Setpoint is only used when the heat pump option has been selected in the ‘Unit Type’ box in the
‘General Information’ panel under the MAG V8 screen. When in heating mode, the low suction value
Setpoint #77 “LOW SUCTION” is reduced by the value of this Setpoint.
171 FLA COMP#1 Full Load Amps for compressor #1. This is the amps at design suction and discharge pressures
referenced in the MCS-Confi g RO screen. This value is used to calculate the high and the low
amperage safety limits. Refer to Set points #75 and #76.
158 DEF START TMP If a defrost option has been specifi ed and either coil #1 or coil #2 temperature is less than or equal to
this Setpoint a defrost cycle will be started if suffi
cient time has elapsed since the last defrost.
159 DEF START DEL Time in minutes between defrost cycles.
161 DEF STOP TMP If both coil #1 and coil #2 temperature are greater than the value of this Setpoint, then the defrost cycle
can be terminated.
162 DEF STOP DEL The length of time in minutes of the defrost cycle.
163 CND HP OFFSET If active, then this value will become the target temperature during heating mode.
139 HI PSI SW
212 CmpVFDFault
164 SwModeDelay Default delay when MHRC2 is switching modes, heat to cool, cool to heat, etc...
If activated this is the elapsed time before a trip occurs and compressor shuts down on safety.
If activated this is the elapsed time before a trip occurs and compressor shuts down on safety.
34
To Next Page
Loading...