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The MGA0800 air conditioning module automatically starts and stops cooling (and, optionally, heating) based on the temperature inside the totem cabinet. This page describes its functions, display panel, menu structure, configurable parameters and commissioning.

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Functions

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Cooling

When the cabinet temperature rises above the cooling start temperature, the module starts cooling. When it falls below the cooling stop temperature, cooling stops.
The cooling start temperature must be higher than the cooling stop temperature + 3 °C.

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Heating (optional)

When the cabinet temperature falls below the heating start temperature, the module starts heating. When it rises above the heating stop temperature, heating stops.
The heating stop temperature must be higher than the heating start temperature.

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Remote monitoring

The module has an RS485 communication interface supporting the MODBUS-RTU protocol, which it uses to communicate with the upper monitoring system. You can also check the running state directly on the display and change parameters there.

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External fan control (optional)

On request, the module can control an external fan for periodic hydrogen discharge and emergency ventilation. Hydrogen discharge (optional): at each cycle, the module starts the discharge fan and the control contact closes. Emergency ventilation (optional): when the cabinet temperature rises above the start temperature, the emergency fans run; when it falls below the stop temperature, they stop.

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Display panel

While running, the main screen (8.8.8) shows the actual cabinet temperature. If no key is pressed for 60 seconds, the display returns to the main screen automatically. Press ▲ or ▼ to show the C-P, ERR and S-P menus in turn. Press SET to enter the displayed menu and ESC to return to the main screen.
Press ▲ or ▼ to show T01–T04 in turn; the value appears after a few seconds.
The S-P ranges come from the menu diagram in the manual and partly differ from the tables in the Functions section (for example, P01: 25–45 versus 20–40, and the manual lists 30–60 for P06). Check the accepted values directly on the unit.

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Change a parameter

1

Open the S-P menu

Press ▲ or ▼ until S-P appears, then press SET to open the password screen.
2

Enter the password

After the correct password, the parameter code appears (default P01).
3

Choose the parameter

Press ▲ and ▼ to change the parameter code, then SET to confirm.
4

Change the value

Press ▲ and ▼ to adjust the value, then SET to save. To exit without saving, press ESC.

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Switch on, switch off and self-test

  • Switch on: if the unit is off, hold SET for 4 seconds.
  • Switch off: if the unit is running, hold ESC for 4 seconds.
  • Self-test: while running, hold SET for 3 seconds. The screen lights fully for 1 second, then shows the cabinet temperature normally while the power icon blinks.

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Commissioning

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Checks before starting

  1. There are no obvious obstructions near the internal air inlet and outlet.
  2. Power and signal cables are connected correctly and securely.
  3. The supply voltage and frequency meet the unit’s requirements.
  4. The fans turn freely without abnormal noise.

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Starting

  1. Close the power switch. The unit runs its self-test, then starts the internal fan. If the internal temperature meets the running condition, the cooling system starts.
  2. Operating parameters have default values, so the unit runs normally without configuration. To change parameters, see Menu structure.