Cosmotec OR Series, Manual

Page: 26 / 34

26
/34
rev 09.2017 - ©STULZ S.p.A. - all rights reserved

Connect the tubing to the chiller using joints or flexible tubes.

Install to switch valves to isolate (section) the chiller from the catchments.

Install a filter on the return tube from the chiller (80-100 microns, Dp 0.2 bar)

Install a flow meter on the return tube (provided upon request).

Install a hydraulic by-pass to adjust the flow pressure (provided upon request).

If there are pressurised closed circuits, install a venting valve on the highest points of the plant.

If there is an automatic water load, install a backflow between the chiller and the hydraulic network
(provided upon request).

Before connecting the chiller to the catchments, check that the tubes used are not dirty or have
residual waste. If there are any doubts, wash them one or more times.
2.3 ELECTRICAL CONNECTIONS

The electrical hook-ups must be done by a qualified electrician.

Before working on the electrical parts, make sure they are not under tension.

Check that the electrical hook-up corresponds to that indicated on the chiller data label (tension,
phase number, frequency).

Connect the right size power cable.

Connect the ground cable with the PE clamp available in the chiller's control panel.

Connect the alarm signals if available (see electrical chart).

connect the external ON-OFF control if provided (see electrical chart).

Check the correct phase sequence.

To adjust the revolutions and aux circuit transformer, see the electrical chart. The correct direction of
rotation is shown on the motors by an arrow. With regard to scroll/rotary compressors, if they are
placed in a unit with control panel installed and with other motors (pumps/fans), it is sufficient that
the latter respect the correct rotation direction and the compressor will do so accordingly. In case the
compressor is installed in a system with no three-phase motors, with a remote control panel or
separate power supplies (e.g. quick connectors that feed the single motor), proceed as follows:
- SCROLL COMPRESSOR: The reverse rotation produces an operating noise exceeding the noise
produced during the regular rotation, at the same time the current consumption is substantially
reduced from the value shown in the wiring diagram and the cooling capacity is not fulfilled (Value
close to 0 kW)
CAUTION: if connected incorrectly the thermal protector can operate to protect the compressor. If
the connection is not properly restored, the compressor may be irretrievably damaged.
- ROTARY COMPRESSOR: check that the cooling capacity is fulfilled, if this does not occur it
means that gas does not circulate in the system resulting from the wrong rotation direction.