32
# Name Description
27 MAX ROC - If the negative Rate of Change exceeds this value we are approaching the target fast enough. The
capacity control state is set to HOLDING. Used only with the Magnum Control Zone control method.
28 MAX ROC + If the positive Rate of Change exceeds this value we are approaching the target fast enough. The
capacity control state is set to HOLDING. Used only with the Magnum Control Zone control method.
29 ROC INTERV The number of 1 second samples used for calculating the Rate of Change. Used only with the Magnum
Control Zone control method. (Maximum 60 seconds)
relative to the difference between the current control sensor and target). The larger the value the larger
the adjustment (usually 1).
48 CND ADJ DELAY
(Modulating Type)
If active this is the time in seconds between condenser adjustments to the AO. If inactive, then 30
seconds will be used as the delay.
If type is DELAY: (required for condenser relay delays).
-MIN VFD Opening cell contains the time delay between turning on a relay and moving the AO to its
minimum position (Setpoint #52).
-MAX VFD Opening cell contains the time delay between turning off a relay and moving the AO to
100%.
49 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 PSI
(Modulating Type)
Target, the logic will try to maintain by modulating the AO. The High & Low values in this set point
defi ne the control zone.
51 CND FAN 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)’ fi eld: This fi eld contains the condenser stage that must be on before the VFD is modulated.
52 CND MIN SPD
(Modulating Type)
Minimum AO % allowed.
If compressor is off, then check the “Time (SEC)” fi eld:
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 FAN MULT 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 MIN ADJ
(Modulating Type)
The value in this Setpoint is the minimum % the AO will be modulated when a change is made.
56 CMP ADJ DELY Used with variable capacity compressors. ‘Time (sec)’ fi eld: If used, this is the fast unloading state
time delay. This option is selected in the ‘Fast Unload Delay’ box in the ‘Compressor Information’ panel
under the MAG V8 screen.
59 ACYC OFF->ON This is the anti-cycle time delay (in seconds) from when the compressor was turned off. This value is
used in a calculation to determine how long a compressor should be in the anti-cycle state. Defi nes the
compressor off time before restarting.
30 MAX LOAD % Indicates the maximum compressor load%, or speed allowed. Usually set to 100%.
31 MIN LOAD % Value: Indicates the minimum compressor load%, or speed allowed (usually 40%).
32 MAX ADJUST % Indicates the maximum percentage change that can be made to compressor or VFD.
33 MIN ADJUST % Indicates the minimum percentage change that can be made to compressor or VFD.
34 LOAD SENSITY This controls the sensitivity of the adjustment made to the Wanted Percentage (adjustments are
61 CMP OFF RPMs This is the RPM value for turning off the compressor when in PUMP DOWN mode.
62 CMP SpinDown Maximum time delay (in seconds) that a compressor can remain in the PUMP DOWN or PRE-PUMP
down states. The Time in sec fi eld specifi es the time the unit can remain in unloading before shutting
off the LLS & EXV and pumping down.
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