Technibel PHRT 9 - Page 8

GB
8
5.3.2 - CTN TYPE TEMPERATURE PROBE
• 10 kΩ at 25° C.
5.4 - OPERATING MODES
• The machine is wired in the factory to operate in heating mode.
• The operating mode changeover (heating / cooling) may be controlled remotely by means of an external contact (not
supplied) connected to the unit (see details in paragraph 4.3.3):
- contact open = cooling - contact closed = heating.
5.5 - STARTING
The unit is factory configured for remote control by contacts (see other possibilities in paragraph 4.3.3).
• Initial condition:
- machine hydraulically and electrically connected ready to operate,
- operating mode remote changeover switch is in required position (heating or cooling),
- the remote stand-by contact is open (= stand-by).
• Turn the installation on:
- the display comes on and shows the water temperature (read by the control probe SD1). The mode indicator lamps (4)
and (5) flash to signal remote stand-by,
- the unit's circulating pump starts.
• To start the unit:
- close the remote stand-by contact (not supplied) if connected (see paragraph 4.3.3)
- The indicator lamp corresponding to the selected mode lights up:
- indicator lamp (4): Cooling,
- indicator lamp (5): Heating.
- The compressor "ON" indicator light (6) comes on if necessary (see diagram paragraph 5.4). If the light flashes, it means
that the compressor is starting required but that a safety delay is in progress. This light stays on when the compressor
has started.
• To stop the unit:
- open the remote stand-by contact,
- the compressor operation indicator lamp (6) goes out and the operating mode indicator lamps (4) and (5) flash,
- the unit's circulating pump remains in operation.
• Complete stop:
- the unit can be completely stopped with the circulating pump shut-down by pressing and holding the ON/OFF button (1)
for 2 seconds. The display unit goes blank, only the decimal indicator lamp (9) remains illuminated. This shut-down takes
priority.
Note:
Shut-down of the circulating pump is delayed 1 minute after the compressor stops.
CAUTION:
we recommended that the unit be shut down a few minutes before changing the
operating mode (heating <---> cooling).
Temperature (°C) Ohmic value (Ohm)
-20 67 740
-10 42 450
0 27 280
10 17 960
20 12 090
25 10 000
30 8 313
40 5 820
50 4 161
60 3 021
70 2 229
Compressor control
Water temperature
Hysteresis cooling mode (factory set at 3k)
Cooling setpoint
Cooling
Compressor
control
Water temperature
Hysteresis heating mode (factory set at 3k)
Heating setpoint
Heating
2 seconds