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120
12.2 Protection Control for Heating Operation
12.2.1 Outdoor Air Temperature Control
The maximum current value is regulated when the outdoor air temperature rises above 14°C in order to avoid
compressor overloading.
compressor overloading.
12.2.2 Deice Operation
When outdoor pipe temperature and outdoor air temperature is low, deice operation start where outdoor fan motor
stop.
stop.
Deice judging condition
Deice mode selection condition
o There are 2 deice modes, according to water inlet temperature and outdoor ambient temperature the deice
mode is decided.
Judgement details:
1) When water inlet temperature is more than 50°C, unit will operate deice mode 1.
2) When water inlet temperature is less than 27°C, unit will operate deice mode 2.
3) When water inlet temperature is less than 50°C and outdoor ambient temperature is less than -10°C, unit will
2) When water inlet temperature is less than 27°C, unit will operate deice mode 2.
3) When water inlet temperature is less than 50°C and outdoor ambient temperature is less than -10°C, unit will
operate deice mode 2.
4) When water outlet temperature sensor 2 detect temperature is less than 22°C, unit will operate deice mode 2.
-30
-30
-20
-10
0
10
20
30
-25
-20
-15
-10
-5
0
5
10
O
D
P
ipe
T
e
m
p
er
at
ur
e
(°C
)
Outdoor Unit Deice Control
line for continuous 3 minutes
and Pipe Temperature below this
When Heating Time > 35 minutes
Outdoor Temperature (°C)
3. Heating accumulation time
1. Outdoor air sensor temp.
2. Outdoor pipe sensor temp.
Deice start depends:
50°C
27°C
-
10°C
Water inlet temperature
Outdoor ambient temperature
Deice mode 1
Deice mode 2
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