The safety relief valve, expansion vessel and upper filling valve always remain connected with the
solar thermal system, even when the ball valves are shut off! Never try to isolate them from a filled
solar thermal system as there is a risk of serious injury and damage to the system!
Never close the safety valve discharge piping, it shall remain free for fluid eventually discharged by
the safety valve!
4.2
Ball Valves
Ball valves are intended to isolate the pump station from a solar circuit. Then it is not necessary to
drain the solar circuit for servicing (incl. cleaning the non-return valve). In order to have a more solid
hydraulic section of the pump station, the upper ball valve is fixed to the rear mounting plate.
The ball valves are controlled by a lever that is not present on the valve during operation. The valve
is closed by turning the lever clockwise by 90°, and opened by turning it anti-clockwise. Prior to
turning the lever, the upper part of the insulation needs to be removed. Thanks to that, shutting off
the solar circuit is reserved to installers and servicing staff. The user cannot simply shut off the solar
circuit, bringing about stagnation and subsequent solar fluid degradation.
The ball valves are fitted with a gland with 2 O-rings (8.7x1.8 mm) that can be easily replaced after
the control element with stops is removed and the gland nut released using a #21 spanner.
WARNING! IMPORTANT!
When the red mark is on the left-hand side, the non-return valve is set
to normal operation position. If you need to open the valve (e.g. to drain
the system), rotate its control so that the red dot is on the right-hand
side. The non-return function is thus out of operation.
It is important for proper operation of the pump station under normal
use to have the non-return valve control always in the right position, i.e.
the red mark on the left-hand side (see fig.).
4.1
Non-return Valve
The non-return valve prevents the tank from being cooled down by gravity circulation during periods
of no sunshine. It is located between the ball valves so it can be removed and cleaned without the
need to drain solar fluid from the entire solar circuit.
The right position during operation.
!
5.
Accessories
Accessories (not included in supply)
These accessories are not included in supply.
The pipe fittings (7629 and 13695) are intended for
connecting a waste pipe to the safety valve.
code
Straight Pipe Fitting,
Cu 22 x Cu 22
Straight Pipe Fitting,
Cu 22 x G 3/4" M
7629
13695
