Technical data

11Manual - Solar hot water systems
4.1.3 Disposal
All Vaillant solar collectors meet the requirements for
the German “Blauer Engel” (Blue Angel) environmental
mark.
Therefore, we, as the manufacturer, will take back and
recycle components when they have to be disposed of
after years of reliable use.
4.2 Solar pump unit
1
2
9
8
11
10
7
6
5
4
3
Fig. 4.9 Design of the solar pump unit
Key
1 Expansion relief valve
2 Pressure gauge
3 Pressure release pipe with collecting container
4 Solar expansion vessel
5 Protection vessel (optional)
6 Fill/vent valve (for filling and draining the solar circuit)
7 Flow rate meter
8 Three-speed solar pump
9 Fill/vent valve (for filling the solar circuit)
10 Group of pipes with insulation
11 Stop valves with gravity brakes
4.2.1 Design
The solar pump unit transports heat from the collector
to the consumer safely and efficiently.
The solar pump unit mainly consists of:
- The group of pipes of the solar pump unit with
insulation (10)
- Two stop valves with gravity brakes (11) to prevent
heat diversion. (The gravity brakes are ineffective if
the stop valves are in the 45° position.)
- The water control pack with an expansion relief valve
(1) with 6 bar blow-off pressure and a pressure gauge
(2) for visual inspection
- Two fill/vent valves for filling and draining the solar
circuit (6 and 9)
- A three-speed solar pump (8)
- A flow rate meter to optimally adjust the required flow
rate (7)
- A solar expansion vessel (4) (separate accessory)
- A protection vessel (5) (separate accessory)
4.2.2 Water control pack
The solar pump unit is delivered with a water control
pack, consisting of an expansion relief valve (1) and a
pressure gauge (2) for visual inspections.
4.2.3 Solar expansion vessel
The solar expansion vessel (4), is used to equalise the
pressure while the pressure relief valve (1) blows off the
solar fluid into the collecting container via the pressure
release pipe (3) if the operating pressure of 6 bar is
exceeded.
h
Note!
The solar fluid container is of sufficient size
and intended as a collecting container. Lay a
pressure release pipe from the expansion relief
valve to the collecting container.
The size of the solar expansion vessel is based on the
collector volume and the expansion volume of the solar
system.
The expansion vessel not only accommodates the
expansion volume of the solar fluid, but also the entire
volume of the collectors in the event of a shutdown. The
total volume of the solar system is the total of the
individual values of the collector, heat exchanger volume
and the volume of the pipeline.
The admission pressure of the solar expansion vessel
can be set between 0.5 and 4.0 bar.
4.2.4 Protection vessel (item no. 302 405)
In the event of unfavourable system configurations (e. g.
very large collector surface, installation of the solar
pump unit under roof), the solar expansion vessel (4)
may be subjected to excessive temperatures by the solar
fluid if the system is shut down. In worst cases, this can
cause the membrane of the solar expansion vessel to be
overheated and to fail.
The installation of a protection vessel (5) is
recommended in all cases. The solar expansion vessel is
protected from excessive temperatures by 5 l of solar
fluid in front of it. Vaillant recommends the installation
of the protection vessel for all solar systems (item
no. 302 405).
Description of the components 4