Nibe SAM S42 - System Working Range & Alternatives

WORKING RANGE SAM S42
Recommended pressure drop in the climate
system
0
0 l/s
l/h
0,250,200,150,100,05
20
40
30
10
50
60
Tryckfall radiatorkrets
(kPa)
600 8004002000 1000
Vattenflöde
Pressure drop across the
climate system
Water flow
The diagram shows the minimum pressure drop you need
in the climate system at a given flow in order to achieve the
desired capacity. The pressure drop across SAM S42 is the
same as that across the climate system that is parallel with
SAM S42.
Check that the working point is inside the grey area. If the
working point is inside the dark grey area, to the left in the
diagram, it can give rise to an oscillating supply air temper-
ature. If there is too low a pressure drop across the climate
system that is parallel with SAM S42, there is a risk of ending
up in the white area. In this area, there is a risk of too low a
water flow through the supply air module and there is then
a risk of freezing.
CAPACITY, HEATING MEDIUM PUMPS
The heat pump’s heating medium pump (EB100-GP1) and
the supply air module’s heating medium pump (AZ20-GP6)
together provide the available pressure shown below.
Max capacity, heating medium pumps
0
0 0,05 0,1 0,15 0,2 0,25 0,3 0,35 0,4 0,45 0,5
20
80
40
100
120
140
160
60
180
Tillgängligt tryck
(kPa)
Flöde
(l/s)
Pressure
Flow
THE CLIMATE SYSTEM’S PROJECTED
PRESSURE DROP
You need to know this in order to assess whether SAM S42
is suitable for installation in the system:
• DOT
• Supply temperature at DOT
• Supply air flow
• The climate system’s projected pressure drop
Example
DOT: -30
Supply temperature at DOT: 35 °C
Supply air flow: 53 l/s.
1. Select the diagram titled "Supply temperature 35°C at
DOT".
2. Select the graph for 53 l/s.
3. The water flow at DOT -30 is approx. 400 l/h.
0
-40 -35 -30 -25 -20 -15 -10 -5 0 5
200
400
600
800
1000
1400
1200
1600
Vattenflöde
(l/h)
18 l/s
71 l/s
53 l/s
36 l/s
Dimensionerad utetemperatur (DUT)
(ºC)
Water flow
DOT
4. In diagram "Recommended pressure drop in the climate
system", you check the climate system’s projected
pressure drop at water flow 400 l/h.
5. The climate system’s projected pressure drop is 5 kPa:
the working point is inside the white area, there is a risk
of freezing and there is a risk that the desired supply air
temperature will not be attained.
0
0 l/s
l/h
0,250,200,150,100,05
20
40
30
10
50
60
Tryckfall radiatorkrets
(kPa)
600 8004002000 1000
Vattenflöde
Pressure drop across the
climate system
Water flow
SAM S42Chapter 4 | Pipe and ventilation connections14