Troubleshooting guide
MAGNUM VERSION 8 MANUAL REVISION 3.1
78
CND START %
(Modulating Type)
If active, then the value is the starting % for the AO when the RO that is tied to it turns on.
The value in the “Time (SEC)” cell is the AO starting stage. If no Relays are used when
CMP starts set value.
50 CND TRGT
(Modulating Type)
Target the logic will try to maintain by modulating the AO.
LO AMB SUMP OFF
(RO Type)
If active and ambient temperature is less than the value of this Setpoint, then the sump pump
relay will be locked off if it is the starting condenser Relay Output. When the ambient
temperature rises above the value of this Setpoint plus two times the value in Setpoint
#192 “FRZ TEMP DIFF” if active (hardcoded 15°F if inactive), then the sump pump relay
will be allowed on again.
51
CND ADJ DIV
(Modulating Type)
Controls scaling of the amount the AO is adjusted (usually 1). The larger the number the
smaller the AO adjustment as the adjustment will be divided by this value.
CND VFD MIN If there is a VFD associated with the condenser, this is the starting minimum speed.
‘Time (sec)’ field: This field contains the condenser stage that must be on before the VFD is
modulated.
52 CND MIN %
(Modulating Type)
Minimum AO % allowed.
If compressor is off, then check the “Time (SEC)” field:
If 0, then the AO % will be set to the value of this Setpoint. If 2 and the run/stop is set to run,
then set the AO % to 100%, else set the AO % to 0%. This option is selected in the
“Default Valve Opening % when Comp. is OFF” box in the condenser information section
in the MAG HVAC screen.
53 CND ROC-
(Modulating Type)
Maximum negative rate of change allowed. If the rate of change is less than this Setpoint,
then stop modulating the AO. The absolute value of this Setpoint also serves as the
maximum positive rate of change allowed. If the rate of change is greater than the
absolute value of this Setpoint, then stop modulating the AO.
54
CND MIN SPD
(RO Type)
Minimum speed percentage for variable speed condenser control.
CND ADJ MULT
(Modulating Type)
Controls scaling of the amount the AO is adjusted. The larger the number the larger the AO
adjustment as the adjustment will be multiplied by this value.
55 CND MAX SPD
(RO Type)
Maximum speed percentage for variable speed condenser control.
CND MIN ADJ
(Modulating Type)
The value in this Setpoint is the minimum % the AO will be modulated when a change is
made.
57 LO AMB PROC When this Setpoint is active and there is a process pump, the process pump will be turned on
when the ambient temperature is less than the value of this Setpoint. The process pump
will be turned off again when the ambient temperature is 5.0° Fahrenheit greater than the
value of this Setpoint.
90 COND FAULT For Condensers with Fault Indicators: If Setpoint is active, a condenser fault occurs, and the
Setpoint type is Alarm, then an alarm message will be generated. If the type is Lockout,
and a condenser fault occurs, then all of the compressors associated with this fault will be
locked off.
For Common VFD Fan Condensers with Bypass: Time in seconds before the bypass can be
used when a fault has occurred.
193 CND HI/LO ZONE The value in this Setpoint is the high and low zone for your target of Setpoint #50 “CND
TRGT“. If inactive then a default zone of 5 psi will be used, if metric .3 Bar.
194 CND 2ND ZONE The value in this Setpoint is the 2nd high and low zone for your target of Setpoint #50 “CND
TRGT“. If inactive then a default zone of 20 psi will be used, if metric 1.4 Bar.
197 COND LOW AMB
(Only CENT)
Standard condenser logic dictates that a newly started compressor will use its own discharge
pressure as the control for the first five minutes. If this Setpoint is active and the ambient
temperature sensor is reading less than the value of this Setpoint, then this compressor’s
discharge pressure will remain in control for the additional time in seconds as specified in
the ‘Time (sec)’ field.