50 EN/39B/06.2018 © STULZ SpA – all rights reserved
SAL
ATTENTION
Never mix different oils together: remove any trace of oil, cleaning piping before using a different
type of oil.
High hygroscopicity: both types of oil (in particular POE) rapidly absorb humidity present in the
air when they are exposed to the atmosphere. If the oil absorbs humidity, the ester molecules can
break down, forming acidity. Therefore, we recommend exposing the oil for as short a time as
possible (a few minutes).
High solvent power: this oil shows excellent solubility towards the deposits of the system. This
interaction of lubricant and coolant with the residue present in the circuit may cause the formation
of agglomerates of insoluble particles which can obstruct small holes and valves. Therefore, we
recommend you to ensure a high cleanliness of the plant.
6.3. Hydraulic connections
During the cooling cycle, part of the air humidity condenses on the evaporator. The condensate is
collected in the tank under the heat exchanger and must be drained outside with a tube.
It has to be connected to the rear side of internal unit and has to be collected to a water discharge
system or suitably brought outside the room to be conditioned.
To position this tube, the following instructions must be respected:
ATTENTION
Do not interconnect the outlets of different machines.
• Make sure there is at least a 2% gradient towards the drain outlet.
• There must be a drain trap placed at least 30 mm below the drain tank.
• Fill the drain trap with water, pouring it into the condensate tank.
6.4. Electrical Connections
DANGER
It's absolutely necessary, before making any connections, to use a suitable tester to check the
supply voltage. This must be the same as the voltage indicated on the technical data plate.
The user must furnish and install, upstream from the unit, an isolating switch with pre-fuse and
capacity as specified on the technical plate in order to be able to perform maintenance on the
unit in the absence of electricity.
The ON/OFF-key on the C2020 keypad (if present) is only used for the unit stand-by. It
must therefore not be considered as a safety element to perform maintenance on the unit.
Maintenance must be done after disconnecting the power supply of the unit (see note above).
Electrical connections may only be performed by authorised technicians.
The system must be connected to an efficient earth circuit.
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