3 Product description
114
Installation and maintenance instructions aroTHERM plus 0020297937_01
3.8
Application limits
The product works between a minimum and maximum out-
door temperature. These outdoor temperatures define the
application limits for the heating mode, domestic hot water
generation and cooling mode. Operating outside of the ap-
plication limits leads to the product switching off.
3.8.1
Application limits, heating mode
In heating mode, the product works at outdoor temperatures
of -25 °C to 43 °C.
0
10
-10
-20
-30
0
10
20
30
40
50
60
70
80
20
30
40
50
A
B
1
2
A
Outdoor temperature
B
Heating water temperat-
ure
1
Application limits, heat-
ing mode
2
Area of application, in
accordance with EN
14511
3.8.2
Application limits, domestic hot water
generation
For domestic hot water generation, the product works at out-
door temperatures of -20 °C to 43 °C.
0
10
-10
-20
0
10
20
30
40
50
60
70
80
20
30
40
50
A
B
A
Outdoor temperature
B
Heating water temperat-
ure
3.8.3
Application limits, cooling mode
Validity:
Product with cooling mode
In cooling mode, the product works at outdoor temperatures
of 15 °C to 46 °C.
25
30
20
15
10
0
5
10
15
20
25
30
35
35
40
45
50
A
B
A
Outdoor temperature
B
Heating water temperat-
ure
3.9
Thawing mode
At outdoor temperatures below 5 °C, condensation on the
fins of the evaporator may freeze and frost may form. This
frost is automatically detected and is automatically thawed at
certain intervals.
The thawing occurs by reversing the refrigeration circuit
while the heat pump is operating. The heat energy that is
required for this is taken from the heating installation.
Correct thawing operation is only possible if the minimum
volume of heating water is circulating in the heating installa-
tion:
Product
Activated back-
up heater, heating
water temperature
> 25 °C
Deactivated back-
up heater, heating
water temperature
> 15 °C
VWL 45/6 and
VWL 55/6
15 litres
40 litres
VWL 65/6 and
VWL 85/6
20 litres
55 litres
VWL 125/6
and
VWL 155/6
45 litres
150 litres
3.10
Safety devices
The product is equipped with technical safety devices. See
"Safety devices" graphic (
→
Page 135).
If the refrigerant circuit pressure exceeds the maximum pres-
sure of 3.15 MPa (31.5 bar), the pressure switch temporarily
switches the product off. Following a waiting period, another
attempt is made to start it. After three failed start attempts in
succession, a fault message is displayed.
If the product is switched off, the crankcase housing heat-
ing is switched on when the compressor outlet temperat-
ure reaches 7 °C. This prevents possible damage caused
by switching the product back on.
If the compressor inlet temperature and the compressor out-
let temperature are below -15 °C, the compressor does not
start up.
If the temperature measured at the compressor outlet is
higher than the permissible temperature, the compressor
is switched off. The permissible temperature depends on the
evaporation and condensation temperature.
