GB
6
4.2 - HYDRAULIC CONNECTION
• Connect the water pipes to the corresponding connections. See Ø and position on page 4.
• Install the hydraulic filter (supplied) on the water intake. Connect it using 2 isolation valves for cleaning purposes.
• Install a shut-off valve if a fill/drainage connection is used.
NOTE:
"Water connection hose" accessories may be used (refer to the accessories paragraph).
4.3 - ELECTRICAL CONNECTION
4.3.1 - GENERAL:
• The acceptable voltage variation is: ± 10% during operation.
• The electrical connection conduits must be fixed.
• Use the cable clamps at the rear of the unit and route the wires under the electric panel, at the level of the terminal strips.
• Class 1 unit.
• The electrical installation must comply with the standards and regulations applicable where the unit is being installed (in
particular NF C 15-100 IEC 364).
4.3.2 - POWER SUPPLY
• The power supply must come from an isolation and electric protection device (not supplied) in accordance with existing
regulations.
• The installation must be protected by a double-pole circuit-breaker (not included).
Note:
The unit is designed to be connected to a power supply having a TT neutral regime (neutral to ground) or TN.S regime
(to neutral) as per NF C 15-100.
POWER SUPPLY CABLE
• Section 230V/1/50Hz : 3 G 4 mm
2
for PHRT 9 and PHRT 12.
• Section 400V/3N/50Hz : 5 G 2.5 mm
2
for PHRT 12, 16 and 5 G 4 mm
2
for PHRT 18.
• The sections are given as an indication only. They have to be verified and adapted, if necessary, according to the
installation conditions and the standards in force.
• Make the electrical connections to the terminal board as per the electrical diagrams.
CURRENT
CAUTION:
In the case of a three-phase power supply, prior to commissioning the unit, make sure that the phase rotation
order is correct. If the rotation order is not respected:
- PHRT 12,16: the phase-sequence controller restricts the unit from operating.
- PHRT 18: the compressor will turn backwards (and make an abnormal noise).
To fix this, simply invert the 2 phases.
4.3.3 - CONTROL BY EXTERNAL CONTACTS
• The machine is factory-wired for heating mode operation. The unit can be controlled remotely by connecting two good-
quality external potential-free contacts (not supplied) :
-1 for the remote On/Stand-by signal (contact closed = operation authorized, contact open = stand-by),
-1 for change-over of the operating mode (contact closed = heating mode, contact open = cooling mode).
• The On/Stand-by signal is connected to terminals 1 and 2 of the PCB located in the switch box (remove the existing
bridge - see diagram).
• The mode change-over signal is connected to terminals 3 and 4 of the
PCB (remove the existing bridge - see diagram).
• The wiring of these contacts must not be routed near power cables in
order to avoid electromagnetic disturbances.
• Use shielded cable with twisted pairs (shielding grounded on
generator side).
• Max. connection cable length: 100 m.
•Minimum wire size: 0.5 mm
2
.
CAUTION:
Mode changes (heating/cooling) are to be performed with the
unit shutdown.
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