Troubleshooting guide

MAGNUM VERSION 8 MANUAL REVISION 3.1

7.63. Normal Condenser Discharge Control Bypass (8.02-A)

Depending on what option was selected in MCS-Config, normal condenser control can either be based upon

the compressor with the highest discharge pressure or on the pressure of the most recently started

compressor. If control based on newly started compressor was selected then Setpoint #206 may be used to

bypass this logic because of a high ambient temperature.

(Refer to section 13 Setpoint #206)

7.64. Test for Voltage Out of Balance (8.02-A)

This test requires Setpoint #207 to be active. (Refer to section 13 Setpoint #207)

Only voltage sensors that are specified in the MAG V8 screen of MCS-Config will be included in the

calculation.

7.65. Expanded Testing of Low and High Off (8.02-E)

This test requires Setpoints #208 LOW SI OFF and #209 HI SI OFF to be active. (Refer to section 13

Setpoints #208 and #209)

7.66. Expanded Compressor Rotation to Check for Maximum Run Time (8.02-

In the Compressor Information panel of the MAG V8 screen in MCS-Config, there is now a check box to select

how compressors are to be rotated, based either on Run Time or First On/First Off.

7.67. New Option to test for Low Superheat on Suction or Discharge PSI (8.02-

In the Circuit Base screen under the EXV Control column select “Disc Sph” to test discharge pressure or “Suct

Sph” to test the suction pressure to determine low superheat.

7.68. New Large Character Screen Displaying Control Information (8.03-B)

A new information screen has been added with large character size for ease of reading. This screen is

accessed from the Main Menu of the Magnum Keypad by pressing the F3 key.

ACTUAL DISPLAY DESCRIPTION

If the “Scrolling Information” option has been selected from MCS-Config, this page will be included in the

screen rotation.

7.69. Circuit Amp Value added to Circuit Status Screen (8.03-B)

The amp value is now included in the first page of each compressor information screen. Use the right arrow

button to access it.

7.70. Low Discharge Superheat Test to Economizer (8.03-F)

Requires Setpoint #210 ECO LL3 D-SHT (Refer to section 13 Setpoint #210)

09:55ControlOn



OUT48.1F

IN45.3F

R22

HH:MMHeading

First line is sensor that is the controlling sensor; either entering

or leaving

Second line is contains the other value

The last line is the refrigerant type