Wolf CGB-2-24 - Page 53

3064810_201804 53
25.Fillingtheheatingsystem/trap
Example:
LimitsinrelationtospecicsystemvolumeVA
(VA=systemvolume/max.ratedheatingoutput
1)
)
Totalhardnessconversion:1mol/m³=5.6°dH=10°fH
Total
heating
output
V
A
≤20l/kW V
A
> 20 l/kW and < 50 l/kW V
A
≥50l/kW
Total hardness /
total alkaline earths
Conduc-
tivity
2)
at 25°C
Total hardness /
total alkaline earths
Conduc-
tivity
2)
at 25°C
Total hardness /
total alkaline earths
Conduc-
tivity
2)
at 25°C
[kW] [°dH] [mol/m³] C [µS/cm] [°dH] [mol/m³] C [µS/cm] [°dH] [mol/m³] C [µS/cm]
1 ≤50 ≤16.8 ≤3.0 < 800 ≤11.2 ≤2 < 800 ≤0.11
3)
≤0.02 < 800
2 50-200 ≤11.2 ≤2
< 100
≤8.4 ≤1.5
< 100
≤0.11
3)
≤0.02
< 1003 200-600 ≤8.4 ≤1.5 ≤0.11
3)
≤0.02 ≤0.11
3)
≤0.02
4 ≤600 ≤0.11
3)
≤0.02 ≤0.11
3)
≤0.02 ≤0.11
3)
≤0.02
Thetotalamountofllandtop-upwateroverthelifecycleoftheboilermustnotexceedthreetimesthenominalvolumeofthe
heating system.
1)
According to VDI 2035, in systems with multiple boilers, use the maximum rated heating output of the smallest heat source
2)
High salinity < 800 µS/cm
Low salinity < 100 µS/cm
3)
< 0.11°dH recommended standard; permissible up to limit of < 1°dH
System with a CGB-2-20 system volume = 800 l
Total hardness of untreated potable water = 18°dH
V
A
= 800 l / 20 kW = 40 l / kW
BecausethespecicsystemvolumeV
A
is between 20 and 50 l/kW with a total output
of<50kW,thellandtop-upwatermustbeintherangeof2to11.2°dHIfthetotal
hardnessoftheuntreatedpotablewateristoohigh,someofthellingandtop-upwater
must be desalinated.
A% desalinated water must be added.
A = 100% - [(C
max
-0.1°dH) / C
potable water
- 0.1°dH)] x 100%
C
max
: Maximum permissible total hardness in °dH
C
potable water
: Total hardness of untreated potable water in °dH
A = 100% - [(11.2°dH - 0.1°dH) / (18°dH - 0.1°dH)] x 100% = 38%
38%ofthellingandtop-upwatermustbedesalinated.
V
treatment
= 38% x 800 l = 304 l
Atleast304Lofdesalinatedwatermustbeaddedwhenllingthesystem.
The system can then be topped up with potable water.
Vent the system completely at the maximum system temperature.
The commissioning parameters must be recorded in the system log. This system log
must be handed to the system operator following commissioning of the system. From
that point onward, the operator is responsible for maintaining and keeping the system
log. The system log is provided with the accompanying documents.
The water values, in particular the pH value, electrical conductivity and hardness,
must be measured annually and documented in the system log.
Thetotalamountofllwaterusedoverthelifecycleoftheboilermustnotexceed
three times the system volume (oxygenation!). Where a system requires large
volumes of top-up water (e.g. more than 10 % of the system volume per year), the
cause must be sought immediately and the fault remedied.
Commissioning
Top-up water