Vaillant auroTHERM VFK 900, Start-Up, Maintenance And Troubleshooting Manual

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Manual - Solar hot water systems 0020009607_02 30
Appr
o
x
imat
e c
ylinder he
at up time 15 C t
o
4
5
C (
minut
e
s)
R
ehe
at time f
or 7
0
% o
f c
ylinder c
o
nt
en
ts
(
minut
e
s)
10
15
20
25
30
20
25
30
35
40
45
12
Heat input to cylinder (kW)
15 20 25 30 38 35
VIH S GB 200 S
VIH S GB 250 S
VIH S GB 300 S
Fig. 5.4 auroSTOR cylinder heat-up times (boiler part)
40
40
8 bar*
4 bar*
3 bar*
2 bar*
1 bar*
30
30
20
20
Flow available (litres/min) at entry to system
Flo
w out (litr
e
s
/m
in
) o
f the s
y
s
tem
10
10
0
Fig. 5.5 auroSTOR hot water flow rates at 60 °C
* Static operating pressure of the cold water supply
The displayed flow rates apply to installations in which
the cold water supply is of appropriate dynamic
pressure.
Please contact Vaillant Ltd if the static water pressure is
below 1 bar.
8 bar*
4 bar*
3 bar*
2 bar*
1 bar*
Flow available (litres/min) at entry to system
Flo
w
out (litr
e
s
/m
in
) o
f the s
y
s
tem
40
40
30
30
20
20
10
10
0
Mixed water of 40 °C, mixed from
60 % hot water of 60 °C and
40 % cold water of 10 °C
Fig. 5.6 auroSTOR mixed water flow rates
5 Installation