Vaillant Solar System and auroSTOR unvented solar..., Start-Up, Maintenance And Troubleshooting Manual

Page: 51 / 69

Manual - Solar hot water systems 0020009607_02 58
Number of auroTHERM
exclusive VTK 570 tube
collectors connected in
series
Flow rate
Minimum cross-section of the copper pipe in the
collector circuit with a total length of:
l/min l/h 20 m 50 m
1 0,40 24 15 15
2 0,80 48 15 15
3 1,20 72 15 15
4 1,60 95 15 15
5 2,00 120 15 15
6 2,40 144 15 15
7 2,80 168 15 15
8 3,20 192 15 18
9 3,60 216 18 18
10 4,00 240 18 18
11 4,40 264 18 18
12 4,80 288 18 18
13 5,20 312 22 22
14 5,60 336 22 22
Pump speed:
Depends on pressure loss
in systemt
Maximum (speed 3)
Tab. 6.1 Layout of the pipe cross-section and pump speed, de-
pending on the collector connection for tube collec-
tors auroTHERM VTK 570
Flat collectors VFK 900/VFK 990/1 Flow rate Minimum cross-section of the copper pipe
in the collector circuit with a total pipe
length of:
Number In series l/min l/h 20 m 50 m
1 1 1,33 80 15 15
2 2 2,66 160 15 15
3 3 4,00 240 15 15
4 4 5,33 320 15 18
Pump speed: Minimum (speed 1) Maximum (speed 3)
Tab. 6.2 Layout of the pipe cross-section and pump speed de-
pending on the collector connection for the tube coll-
ectors
6.3 Programming the flow rate on the controller
When programming the flow rate on the solar control,
refer to Section 6.1, Setting system parameters, of the
auroMATIC 560 operating and installation manual.
6.4 Filling the hot water secondary circuit
a Caution!
Risk of damage!
Do not manually open the temperature/pressure
relief valve or the expansion vessel for venting
purposes. Any foreign matter in the pipework
may cause damage to the valve seats.
• Make sure the cylinder drain valve ( 11 , Fig. 5.1) is
closed.
• Open all cold and hot water taps and the
corresponding outlets.
• Open the mains water supply to the auroSTOR and fill
it with water until it flows freely out of the outlets.
Make sure all air bubbles have been removed.
• Close the outlets and check the system for leaks.
Check in particular the immersion heater connection
for leaks.
The system must now be flushed thoroughly.
• Open the hot water taps at the opposite ends of the
systems and let the water flow out for at least 5
minutes.
• Close the hot water taps.
d Danger!
Risk of bursts!
Close the pressure control valves in the water,
solar and heating circuits in accordance with
the Installation chapter. They may under no
circumstances be covered or closed.
6.5 Setting the hot water thermostatic mixing
valve
The hot water from the solar cylinder can be set to a
desired maximum temperature between 30 °C and 70 °C
by mixing hot and cold water.
6 Start-up