MFB/MCFB-2030
This section pertains to -30°C FREEZER ONLY
This freezer has been factory set to run at
As with the
Again, this is a manual defrost system. If ice build up is present ¼ inch or more on the fixed shelves, defrosting is recommended. Large ice build up will reduce cooling efficiency.
If this system is equipped with a temperature display or alarm system it is not uncommon to observe a rise in temperature on the display following a door opening. Unless the door is left open for long periods of time this should not affect product temperature. The temperature display is independent of the thermostat that is actually controlling the off/on cycling of the compressor. Door opening will greatly affect air temperature but generally does not affect product temperature.
ETC Single Stage Electronic Temperature
(-30 Models Only)
Operation
Liquid Crystal Display (LCD)
The LCD display provides a constant readout of the sensor temperature and indicates if the output rely is energized. When the S1 annunciator is constantly illuminated during operation, the relay is energized. The display is also used in conjunction with the keypad to allow the user to adjust the setpoint temperature, differential and heating/cooling modes.
Control Setup
The temperature setpoint refers to the temperature at which the normally open (NO) contacts of the output relay will open. Determine the load(s) to be controlled and the operating mode required, cooling or heating.
When the cooling mode is chosen, the differential is above the setpoint. The relay will
When the heating mode is chosen, the differential is below the setpoint. The relay will
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