Troubleshooting guide
MAGNUM VERSION 8 MANUAL REVISION 3.1
143
# Name Description
8 L.INJECT.ON This Setpoint can be used for both liquid injection solenoids.
Value: Liquid injection is turned on when the discharge temperature is greater than or equal
to this Setpoint, and is turned off when the discharge temperature is less than this
Setpoint minus 10.0F (5.5C). If the controlling SUPER HEAT is 3x its target, LIQ INJ is
turned ON and remains ON until the controlling SUPER HEAT falls below 2x its target.
u(If you change the Setpoint to a target type, the High Zone cell if not zero will be the ON
multiplier and the Low Zone sell if no zero will be the OFF multiplier.)
‘Time (sec)’ field: If the first liquid injection solenoid has been on for a time greater than this
value, then turn on the second liquid injection solenoid.
STAGE 6 CUT IN
(Cut In/Out Control)
Stage 6 cut in, Setpoint value contains the voltage when this stage is turned on.
9 SPRHT TARGET
or
LEVEL TARGET
If EXV control is based upon superheat, this is the Superheat target that the Magnum will
control from.
If EXV control is based upon refrigerant level, this is the refrigerant level target that the
Magnum will control from.
‘Time (sec)’ field: Seconds between samples used for calculating the Superheat Rate of
Change.
STAGE 7 CUT IN
(Cut In/Out Control)
Stage 7 cut in, Setpoint value contains the voltage when this stage is turned on.
10 SPRHT ZONE +- The value in this Setpoint is added and subtracted to Setpoint #9 to determine the upper and
lower limits of the control zone respectively.
‘Time (sec)’ field: If non-zero, skip ROC adjustment logic in the control zone.
STAGE 8 CUT IN
(Cut In/Out Control)
Stage 8 cut in, Setpoint value contains the voltage when this stage is turned on.
11 EXV LOAD ADJ The opening adjustment that will be made to the EXV percentage when the circuit changes to
the Loading state, or the closing adjustment that will be made when the circuit changes to
the Unloading state.
Note: In MOP hold state, only closing adjustments are allowed.
STAGE 9 CUT IN
(Cut In/Out Control)
STAGE 9 cut in, Setpoint value contains the voltage when this stage is turned on.
12 EXV FINE ADJ The adjustment is made when in the 1
s
t
zone above or below the control zone.
STAGE 10 CUT IN
(Cut In/Out Control)
Stage 10 cut in, Setpoint value contains the voltage when this stage is turned on.
13 EXV COURSE This adjustment is made when in the 2
nd
zone above or below the control zone and the
adjustments are made in 1/2 the time. When above or below the 2
nd
control zone the
adjustments are made in 1/4 the time.
STAGE 11 CUT IN
(Cut In/Out Control)
Stage 11 cut in, set point value contains the voltage when this stage is turned on.
14 EXV LOAD DIV As the Amp draw % changes this divides the EXV % change. It is calculated as follows:
[(Max slide% – min slide%) / (Max vlv% - min vlv%)] +1
STAGE 12 CUT IN
(Cut In/Out Control)
Stage 12 cut in, Setpoint value contains the voltage when this stage is turned on.
15 EXV MIN % This is the minimum valve position allowed when modulating the expansion valve. This value
should be set so when hot gas is applied the valve opening is adequate.
STAGE 13 CUT IN
(Cut In/Out Control)
Stage 13 cut in, Setpoint value contains the voltage when this stage is turned on.
16 EXV MAX % This is the maximum position allowed when modulating the expansion valve to maintain the
superheat target. This value should be the valve % opening at full capacity plus a 10 to
15 % margin.
STAGE 14 CUT IN
(Cut In/Out Control)
Stage 14 cut in, Setpoint value contains the voltage when this stage is turned on.
17 LO SUPERHEAT If the calculated superheat remains below this value for the time specified, the Magnum will
generate a LOW SUPERHEAT alarm.