Noise Information - Danfoss DHP-A Service Instructions Manual

For hose of type PEM DN 40, Øi = 35.2:
Table 4. Maximum coil length, hose type PEM DN 40, Øi = 35.2
DHP H, DHP-C, DHP-L
Size
6
8
10
12
16
Table 5. Maximum coil length, hose type PEM DN 40, Øi = 35.2
DHP-H Opti, DHP-H Opti Pro, DHP-L
Opti, DHP-L Opti Pro
Size
6
8
10
12
16
*) When dimensioning size 16, a borehole depth that exceeds this recommendation for coil length is often
required. In such cases two coils should be used.
The different brine coils are distributed from a common collection well. All return lines are led back to the well and
are equipped with choke valves because the flow of each individual coil must be adjusted.
Figure 17. The collection well for distributing to
several brine coils
Choke valves with flow indicators (available as accessories from the Danfoss range) are used to adjust the brine
flow so that it is the same in all coils.
If choke valves with flow indicators are not available adjust the valves until the temperature of all the coil return
hoses is the same.
6.3

Noise information

6.3.1 Preventative measures
Some of the following points can also be used when troubleshooting.
•
Do not install heat pumps on walls adjoining bedrooms.
22 – Service instructions VMGFC302
Calculated maximum coil length per coil, in metres
1 coil
<1000
<750
<1000
<700
<220*
Calculated maximum coil length per coil, in metres
1 coil
<1000
<780
<980
<630
<250*
1
3
4
2
2 coils
-
-
-
<2 x 1000
<2 x 444*
2 coils
-
-
-
<2 x 1000
<2 x 1000
Symbol explanation
1 Brine coil 1
2 Brine coil 2
3 Choke valves
4 Collection well
3 coils 4 coils
- -
- -
- -
- -
-
3 coils 4 coils
- -
- -
- -
- -
- -