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2.3
Operational limits
The following diagrams show the limits of the heat pump. The
temperature difference between the delivery and return of the
plate heat exchanger must be between 5°C and 8°C.
Operating limits for space heating
75
70
3
65
60
55
50
45
40
35
30
25
20
15
10
5
0
-35
-30
-25
-20
-15
-10
-5
Outdoor air temperature (°C)
1
Operation without restrictions
2
Operation of the outdoor unit with possible capacity re-
duction
3
Operation with back-up heating element necessary
Operating limits for cooling
25
(10;23)
20
UF
15
FC
10
5
(10;5)
0
0
5
10
15
Outdoor air temperature (°C)
UF:
underfloor heating
FC:
fan coil
Operating limits for indoor unit
The indoor unit is designed for being installed only in indoor
environments in which the following conditions occur:
– Minimum temperature: 5°C
– Maximum temperature: 30°C - R.H. 65%
1
2
0
5
10
15
20
25
30
35
40
45
Fig. 19
(43;23)
(43;5)
20
25
30
35
40
45
Fig. 20
2.3.1
Compressor frequency table
The maximum allowed frequency varies with the outdoor tem-
perature.
The values shown in the table refer to the following conditions:
– Heating: air temperature < 0°C
– Cooling: air temperature >30°C
Min frequency [Hz]
Max frequency
(heating) [Hz]
Max frequency
(cooling) [Hz]
2.4
Identification
The indoor and outdoor units can be identified through the
50
product identification plate marked with the serial number,
model and main technical-performance characteristics.
Indoor unit
1
Identification plate
50
Outdoor unit
1
Identification plate
Description of the system
NIMBUS EXT R32
35 M 50 M
80 M
120 M
& M-T
& M-T
18
18
18
18
80
100
90
75
65
80
70
57
1
1
15 / EN
150 M
& M-T
18
90
70
Fig. 21
Fig. 22
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