BA_GMLW OTE bis V3.4 SHORT_EN_20090408_V1
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Due to the fact that the Scroll-compressors are
3-phase models, they will run in one or the
other direction, depending upon how the termi-
nal L1, L2 and L3 are connected. To check for
correct connection, test whether, when switch-
ing on, the pressure on the suction side falls,
and that on the high-pressure side increases.
If the compressor is running in the wrong direc-
tion, the pressure on the suction side will in-
crease, the noise level can also be higher than
if the compression is running in the right direc-
tion and the motor draws much less current
than stated in the technical data.
All 3-phase motors (compressors,
pumps, fans) MUST be connected to
a
RIGHT-HAND ROTARY FIELD
.
Longer continuous operation in the
wrong direction will lead to damage.
OCHSNER takes no liability for this.
Connection work which entails
opening the connection boxes is
to be carried out by an authorised
contracting company, due to the
fact that current-carrying compo-
nents can endanger life!
4.6.2 Evaporator
wiring
The motors and sensors on the evaporator are
supplied from the indoor unit. For this, the fol-
lowing cables must be run from the indoor unit
to the evaporator:
Motors/Sensors
Cable
3-phase supply to fan, incl.
signal contact, winding protec-
tion
7 x 1.5
De-ice sensor (
TQA
,
TQE
)
4 x 0.75
Electronic expansion valve
4 x 0.75
1
Rotation speed control for fan
2 x 0.75
Table. 1: List of cables to evaporator
All cables/wiring must be suitable for laying
outdoors and must laid so that they are UV-
protected.
1
Only for version with rotational speed control
If a delta-connection is necessary for operation
for technical reasons, special attention must be
paid to the operating currents and particularly to
setting of the motor-protection relays.
Power for a back-up electrical heating element
is to be provided using a separate external
power supply limiter.
4.6.3
Cable cross sections
Commercially available cables are to be used
to wire up actuators and sensors. Following
guidelines are to be heeded.
Position
min. X-
section
Supply cables 230V~:
(Pumps,
valve motors)
Always size connecting cables
according to local conditions.
1.5 mm²
Sensor cables:
(external sensor,
etc.) Sensor cables must always be
run separately (min. 20 cm) from
230V/400V cables.
The max. cable length must not
exceed 50 m.
0.75 mm²
Bus cables:
(Room remote con-
trols, auxiliary modules) must al-
ways be run separately (min. 20
cm) from 230V/400V cables. Above
50 m cable length, choose 1.5 mm².
The max. cable length must not
exceed 200 m.
1.0 mm²
Table. 2: Chart cable sizing
