Fig. 4
Rear view showing pipe connections on ECO MIDI cabinets
Drain water on MIDI products
These cabinets are delivered with a re-evaporation tray with an electrical heater (60 Watt) and a float switch
which does control the operation of the heater related to water level inside the tray. This system is positioned
inside the bottom compartment of the cabinet on the right side seen from the front. This is done so that the
cabinets can be used where there is no external drain available. If there is an external drain available or there
is a possibility of connecting the cabinet drain outlet to an external drain pump, one of these solutions is
always recommendable in order to save energy. If the cabinet drain water outlet is connected to one of the
two alternative solutions, the complete tray including 60 Watt heater, float switch, junction box, connection
wire and brackes, should be removed prior to installing the cabinet. As a minimum the re-evporation system
must be disconnected in the controller box.
These products have been designed, constructed and built to minimize the time which the installer must use
before and after connecting them to the remote CO
2
– installation. On cabinets without controller known as
NC, every electrical component is already fitted and connected to a connection plinth inside the control box.
Inside the control box a DIN rail is fitted in order to ease mounting of any controller.
When installing the controller of your choice, you should take into consideration, that solid door cabinets are
delivered equipped with components which makes the product capable of running with a temperature set
point range between +12 and -25°C. This means that the cabinets can be built as a fridge or as a freezer.
The reason for this is the desire of leaving maximum flexibility to the installer/refrigeration company when
building the product needed.
This fact does also mean that the following heaters are included:
Electrical defrost heater, drain line heater, re-evaporation heater and door frame heater. These heaters are
not necessarily to be used if a refrigerator is to be configured.
If the cabinet is to run as a refrigerator it will most likely be connected to a remote system which will run a
suction pressure no lower than -10°C. in this case it is recommendable to raise the minimum allowed set
point to no lower than +2°C. which does mean that the adjustment range will be +2 to +12°C.
The difference between controller minimum setpoint temperature and the minimum suction pressure should
never be less than 7K.
If the NC cabinet is to run as a freezer the set point temperature range should be narrowed according to the
performance of the freezer system to which it is connected. E.g. -10 to -22°C or similar.
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