Wolf MKS 85 Installation & Servicing Instructions Manual page 14

Filling Water
Minimum Return Temperatures
Equipment
Radiator heating
less than 20ltr./kW
Design 80/60
Low temperature heating
with less than 20 ltr./kW;
Design temperature
55/45 and above
Equipment with more than
20ltr./kW floor/ low
temperature heating
Design temperature
below 55/45
14
Filling Water
Minimum Return Temperatures
Guide values for water in heating equipment according to VDI 2035 for operating
temperatures up to 100°C:
Total of rated
Group
boiler powers Q
0
1 100 < Q ≤ 350
350 < Q ≤1000
2
*) See VDI 2035 for exceptions
(+) Necessary in some circumstances, see VDI 2035
Guide values for water in heating equipment according to VdTÜV guidelines for
operating temperatures over 100°C:
Filling and supplementary
water
Residual hardness
mval/kg
<0,03
The following measures to maintain a high enough return temperature are needed
in order not to fall below the minimum return temperatures, t
thus to avoid falling below the dew point!
Fuel
Controller
t °C
Kmin
t °C
Rmin
Return boost acc.
to example equip.
t °C
Kmin
t °C
Rmin
Return boost acc.
to example equip.
t °C
Kmin
t °C
Rmin
Return boost acc.
to example equip.
Filling and
supplementary
water
Total of alkaline
kW
earths in Mol/m³
Q ≤ 100
-*)
1 to 3
1 to 2
p value
mval/kg
0,5-1,5
Oil
R31, R32
R33, R33/4
38
30
1-3
38
30
1-3
38
30
2/3
Heating water
pH value Hydrazine Na
Excess in mg/kg
- -
8 to 9,5 -
8 to 9,5 2 to 5(+)
Circulating water
Hydrazine
pH value
Excess in mg/kg
8,5-10,0 0,5-25
, listed in the table and
Rmin
Gas
R31, R32
R33, R33/4
50
40
2/3
50
40
2/3
50
40
2/3
SO
2 3
-
-
5 to20(+)
Na SO
2 3
10-40