Nimbus Compact M NET R32 Installation Manual UK

Description of the system
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
Output water temperature (°C)
75
70
65 3
60
55
50
45
40
1
35
30
25
20
2
15
10
5
0
-35 -30 -25 -20 -15 -10 -5 0 5 10 15 20 25 30 35 40 45 50
Outdoor air temperature (°C)
Fig. 15
1 Operation without restrictions
2 Operation of the outdoor unit with possible capacity reduction
3 Operation with back-up heating element necessary
Operating limits for cooling
Output water temperature (°C)
25
20
15
10
5
(10;23)
(10;5)
UF
FC
(43;23)
(43;5)
2.3.1 Compressor frequency table
The maximum allowed frequency varies with the outdoor temperature.
The values shown in the table refer to the following conditions:
– Heating: air temperature < 0°C
– Cooling: air temperature >30°C
NIMBUS M EXT R32
35 M 50 M 80
M &
M-T
120
M &
M-T
150
M &
M-T
Min frequency [Hz] 18 18 18 18 18
Max frequency (heating)
80 100 90 75 90
[Hz]
Max frequency (cooling)
[Hz]
65 80 70 57 70
2.3.2 DHW Safety device intervention order
To prevent excessively high temperatures and pressure inside
the tank, the indoor unit is fitted with protection and control
devices that will intervene in the following order:
1 Thermostatic control device: this device, consisting of a
sensor positioned on the DHW tank, switches off the heat
source once the programmed set-point has been reached.
2 Energy cut-out device: this device is a manual-reset
thermostat and is positioned on the heating element of
the technical circuit. The thermostat intervenes when a
temperature of 85°C is reached. If it intervenes, it must be
reset manually.
3 Temperature and pressure relief valve: the tank is fitted
with a T&P relief valve that intervenes in case of overtemperature
(90-95°C) or overpressure (7 bar). Whenever
the valve intervenes, the water flow it discharges could
have a very high temperature.
0
0 5 10 15 20 25 30 35 40 45 50
Outdoor air temperature (°C)
UF:
FC:
underfloor heating
fan coil
Fig. 16
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%
Operational limits
– Minimum system water temperature: 5°C
– Maximum system water temperature: 70°C
– Cylinder maximum operating pressure: 0.6 MPa (6 bar)
– Maximum inlet pressure of the safety inlet assembly: 1.2
MPa (12 bar)
– Hydraulic circuit maximum pressure: 0.3 MPa (3 bar)
14 / EN