Emptying The System; Non-Return Valves; Security Device - Roth ST 20/11 Manual

Pump station ST 20/11
3. Emptying of the system
• Open the non-return valve in the ball valve (therefore
see following advice).
• Open the exhauster at the highest point of the system
(above the collector).
• Open the KFE-cock at the lowest point of the system,
4. Non-return valve
• The non-return valve of the solar group is integrated
into the ball valve above the circulation pump. It has an
opening pressure of 200 mm water column.
• To empty the system completely, the non-return valve
has to be opened. Therefore the knob of the ball valve
has to be in position of 45°. In doing so, the ball in
the ball valve opens the non-return valve.
• In normal operation of the system, the ball valve has to
be completely opened .
• In order that wrong circulation can be avoided (as well
as "In-pipe-circulation") the flow line (from the collec-
tor to the store) has to be equipped with a siphon or
an additional non-return valve.

5. Security device

• The solar station is prepared with a solar-diaphragm
security valve, which corresponds to relavant rules
and regulations. The following references have to be
considered during the installation and operation of the
solar station:
• The security valve has to be available.The efficiency of
the valve must not be influenced or disabled by barri-
ers!
• The dirt trap or other strictures are inadmissable
between the collector (-field) and the security valve!
• The diameter of the pipe must correspond to the dia-
meter of the valve exit; the maximum length must not
be longer than 2 m; more than 2 bows are inadmissable.
By overstepping the maximum values (2 bows, 2 m pipe),
you have to install a blow off pipe in larger dimensions.
However, it has to be considered that more than 3 bows
and 4 m pipe length is inadmissable.
• If the blow-off pipe leads into a drain pipe with a hopper,
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if possible close by the store connection (not included
in the full kit) and the pump.
the size of the drain pipe has to be at least twice as big
as the valve's inflow. in addition to that, the blow-off
pipe must be installed gradiently; the mouthpiece has
to be open and observable and routed in that way of
blowing off no persons are endangered.
• It is useful to place a canister under the blow off pipe. In
case that the security valve opens the fluid is caught and
it can be refilled in case of lower system pressure.
ball valve
open
ball valve
closed
ball valve
open closed
!