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 insufficient air flow for its start-up, a differential pressure switch will stop the unit until it has defrosted.
-In the absence of the electric preheating coil:
-a differential pressure switch will prevent the heat exchanger from freezing, stopping the unit when
freezing begins
The differential pressure switch will be set in accordance with the nominal air flow. If the Modular L
Smart unit works according to different criteria than that of the nominal air flow, it will be ESSENTIAL
to adjust the settings according to the following table.
Factory settings of the differential pressure switch for freezing prevention
Size
03
04
05
06
07
Pa
300
360
310
290
340
Factory settings for freeze protection - differential pressure switch:
Size 3
Size 4
0
50
100
150
200
250
300
350
400
0
200
400
600
800
1000
1200
1400
[P
a]
[m
3
/h]
Size 03
0
50
100
150
200
250
300
350
400
0
500
1000
1500
2000
2500
[P
a]
[m
3
/h]
Size 04
Summary of Contents for Modular T Smart ATB
Page 2: ......
Page 59: ...1 2 5 6 7 8 3 4 M5x20 59 19 Filter disassembly only for sizes 5 6 7...
Page 60: ...3 4 2 M5x20 1 60 20 Exchanger removal...
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Page 65: ...65 Repair log DATE SERVICE TYPE TIME REQUIRED SIGNATURE...
Page 66: ...66 DATE SERVICE TYPE TIME REQUIRED SIGNATURE...
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