Rev. F 02-2021
19
Modd.
Lw
Lp
63
125
250
500
1K
2K
4K
8K
dB
dB(A)
dB(A)
dB
dB
dB
dB
dB
dB
dB
dB
75
72,1
63,3
57,2
55,7
54,6
49,2
45,8
36,7
72,9
59
52
100
74,1
65,3
59,2
57,7
56,6
51,2
47,8
38,7
74,9
61
54
150
80,1
71,3
65,2
63,7
62,6
57,2
53,8
44,7
80,9
67
60
200
82,1
73,3
67,2
65,7
64,6
59,2
55,8
46,7
82,9
69
62
MTEC.6400.GB-F-1 Operation and maintenance manual HDA series English
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3.5 Sound data
Sound data
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Lw: Sound power level according to ISO 9614
fan with available static pressure 50 Pa.
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fan with available static pressure
50 Pa
.
3.6 Safety devices
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The high pressure switch stops the unit when the discharge compressor pressure is higher than the set value. The restart is automatic, done
when the pressure is under the level set in the differential value.
3.6.2 Defrost sensor
It’s a device which signals to the electronic control, the necessity to make the defrost cycle. Once the defrost cycle is activated, the defrost
sensor also determines termination.
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damage the system. All the units are supplied, standard, with a control which defrost automatically the heat exchanger if necessary. This
control provides a temperature probe (defrost thermostat) on the unit evaporator. When the defrost cycle is required, the microprocessor
control (according to set parameters), switches the compressor off, while the fan remains in operation. At the end of the defrost cycle, there
is a timer delay to allow condensate water to clear from the coil.
