Daikin Modular T Smart ATB - Page 52

52
Prevention of heat exchanger freezing
- In the presence of electrical preheating:
- the electric preheating coil will prevent the heat exchanger from freezing, by modulation, once the
outside air temperature drops below the limit value, set at 0°C; in the event of a malfunction of the heater
or insucient air ow for its start-up, a dierential pressure switch will stop the unit until it has defrosted.
- In the absence of the electric preheating coil:
- a dierential pressure switch will prevent the heat exchanger from freezing, stopping the unit when
freezing begins
The dierential pressure switch will be set in accordance with the nominal air ow. If the Modular L
Smart unit works according to dierent criteria than that of the nominal air ow, it will be ESSENTIAL
to adjust the settings according to the following table.
Factory settings of the dierential pressure switch for freezing prevention
Size 03 04 05 06 07
Pa 300 360 310 290 340
Factory settings for freeze protection - dierential pressure switch:
Size 3
Size 4
0
50
1 00
1 50
2 00
2 50
3 00
3 50
4 00
0 2 00 400 6 00 8 00 1000 1200 1400
[Pa]
[m
3
/h]
Size 03
0
50
1 00
1 50
2 00
2 50
3 00
3 50
4 00
0 500 1000 1500 2000 2500
[Pa]
[m
3
/h]
Size 04