Wolf CGB-75 - Page 44

44 3062555_201804
Example:
 Systemoutput=170kW;
system volume V
System
=4000l;
Volume of top-up water
V
Top-up
=1000l
Total hardness of drinking water C
DHW
=18.5°dH;
Maximum permissible total hardness C
max
=8.4°dH
 Systemoutput=170kW;
system volume V
System
=4.000l;
Volume of top-up water V
Top-up
=1000l
VAspec=4000l/170kW=23.53l/kW
Total hardness of drinking water C
DHW
=18.5°dH;
Maximum permissible total hardness C
max
=8.4°dH
Proportionofllingwatertobetreated:
A=100%-[(8.4-0.1)/(18.5–0.1)]x100%=54.9%
54.9%ofthellingandtop-upwatermustbedesalinated.
V
Treatment
=54.9%x(4.000l+1.000l)=2.746l
 Whenllingthesystem,2,745lofdesalinatedwatermust
be added. The system can then be topped up to V max with
drinking water.
When topping up, it is important to check regularly that the
permissible total hardness is not exceeded.
26.Technicalinformationforwatertreatment
Example:
System with a 170 kW boiler;
system volume V
System
=4000l;
V
A,specic
=4000l/170kW=23.5l/kW
This is greater than 10 l/kW, therefore stage 3 must be se-
lectedinsteadofstage2.Thellandtop-upwatermustbe
in the range of 2 to 8.4 °dH.
If the total hardness of the untreated drinking water is too high,
someofthellandtop-upwatermustbedesalinated.
A% desalinated water should be added:
A=100%–[(C
max
–0.1°dH)/(C
DHW
–0.1°dH)]x100%
C
max
maximumpermissibletotalhardnessin°dH
C
Drinking water
total hardness of the untreated drinking water
in°dH
We recommend allowing for the expected top-up water during
therstll.Untreateddrinkingwatercanthenbeaddedlater.
V
Treatment
=Ax(V
System
+ V
Top-up
)
In large systems in stage 4, the top-up water should not be
takenintoaccountduringtherstll.
V
Treatment
=Ax(V
System
)