Elstat EMS-55, Техническое руководство по эксплуатации, Страница: 14 / 26

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The EMS monitors the door status by means of the door switch. If the cooler door is left open for the
period set in parameter AD, then an internal buzzer will sound to attract attention. To avoid irritation
caused by this alarm, the buzzer will sound for the length of time set in parameter B1. If the door is
still open after the buzzer has sounded then the EMS will close down the refrigeration system and will
not restart it until the door is finally closed. This function also means that the refrigeration system is
not continuously running during a cabinet reload.
THE BLOCKED CONDENSER WARNING SYSTEM
If the condenser of a refrigeration system is blocked, the result is a rise in temperature of the
discharge line and condenser.
The fact however, is that the final 20-30 % of the blockage generates a high rise in discharge
temperature and therefore can be used as a positive signal.
Other causes of overheating can be:

Extreme ambient temperatures

The appliance being enclosed etc.

Undersized condenser

Oversized compressor/displacement etc.
To detect overheating the condenser sensor must be connected and then attached to the discharge
line. When the system achieves the alarm temperature, the system will be switched off and the alarm
notification will appear on the display of the control. To reset this alarm the UP button must be
pressed.
THE REFRIGERATION SYSTEM FAILURE WARNING
The most common failures in a refrigeration system are:

Blocked condenser

Condenser fan failure

Evaporator fan failure

Refrigerant leak

Blockage (capillary systems only)

Electrical fault
These failures can result in inefficiency or breakdown of the system. If not rectified these can and
eventually damage the refrigeration system, for which the worst and most costly is damage to or even
a burn out of the compressor.
The EMS monitors the time taken to achieve the set point (parameter CT) and if it is not reached in
the set time interval then the refrigeration system will be shut down. In this case the display will show
the letters “RSF” (Refrigeration System Failure). To reset this alarm the DOWN button must be
pressed.
UNINTERRUPTED PULL-DOWN FUNCTION
If the temperature in the appliance rises above the value set in parameter IPD then the EMS will
perform an uninterrupted pull down. This means that the refrigeration system will be activated and all
defrost cycles will temporarily be suspended. This is to ensure that the load in the cooler is reaches its
set temperature in the shortest possible time. In practical circumstances this will occur after, for
example, a re-load. If the cooler is in operational mode the temperature will be reduced to operational
level but when the cooler is in stand-by mode the temperature will be reduced to stand-by level.