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2.4 Electrical connection
All electrical work must be carried
out by authorised, qualifi ed person-
nel, in accordance with current IEE regula-
tions and/or other local regulations.
Before carrying out any work, isolate the
control unit from its power supply.
Install the SOKI permanently to the
solar control unit in accordance with the
installation and operating instructions of the
respective control unit. Secure the electrical
interconnecting cable with strain relief.
2.5 Installing the expansion vessel
The Stiebel Eltron expansion vessel is suitable
for H-30 L or H-30 LS and approved for an
operating pressure of up to 6 bar.
The expansion vessel inlet pressure must be
3 bar, when the system has not been filled.
Check the inlet pressure in all cases when
the system is empty. An adjustment of the
inlet pressure subject to height is not
permissible. Connect the expansion vessel
(connection from below) on site with the
SOKI (13).
2.6 Flushing and fi lling the system
● Connect the pressure hose to the fill &
drain valve (5) below the pressure gauge
(4), and open the valve.
● Connect the flushing hose to the fill &
drain valve (5) t the flow meter (8), and
open the valve.
●
The slot in the adjusting screw on the
F
flow meter (8) must be in its horizontal
position. This closes the integral ball valve.
Open the gravity brake above the
E
pump. For this, position the ball valve with
a size 14 open-ended spanner into the 45°
position (half-way position).
● Fill the system with neat process fluid
H-30 L/LS.
● Flush the solar circuit for at least 15 min
E
Gravity brake (6) at the ball valve
Open
Close
Gravity brake active
Ball valve closed
using the flush and fill station (not part of
the standard delivery). To ensure that all air
is purged from the system it is necessary
to briefly and intermittently open the
adjusting screw at the flow meter (8) (slot
vertical).
● Never flush or test the solar heating
system with water. The system cannot be
completely drained. Water would lead to a
risk of the system freezing up.
● Close the flushing fill & drain valve (5)
(drain cock) with the filling pump switched
ON, and raise the system pressure to
approx. 6 bar. Check the system pressure
at the pressure gauge (4).
● Close the fill valve and switch the pump on
the flushing and fill station OFF, then open
the adjusting screw at the flow meter (8)
(slot vertical).
● Vent the system above the collectors,
until the system liquid is expelled free
of bubbles. Raise the pressure again to
approx. 6 bar and check the system for
leaks. You have to assume that the system
leaks if the pressure gauge (4) registers a
severe drop.
● Adjust the operating pressure to 3.5 bar.
● Run the pump (7) at its highest speed and
let it operate for at least 15 min.
B
● Adjust the pump to required flow rate.
● Optimum fl ow rate:
5 litres/min/assembly
● Remove the hoses from the fill station and
plug the ports in the flushing and fill valves.
● Check the system once more for possible
leaks. Fully open the ball valve (6) above
the pump.
● Fit the front insulation shell (12).
Flow meter
F
Setting for
flushing
13
The checking marker
11
is the top edge of
the floating body
9
7
2.7 Draining the system
● Open the gravity brake inside the
ball valve (6).
● Open the air vent valve at the highest
point (above the collectors) of the system.
● Open the fill & drain valve at the lowest
point of the system, either at the flushing
fill & drain valve (5) (drain cock) or at
the SAS SOKI (not part of the standard
delivery).
2.8 Gravity brake
● The gravity brake is integrated into the
ball valve (6) above the pump (7). It has an
opening pressure of 20 mbar.
● Draining the system requires that the
gravity brake is open. For this, move the
ball valve handle (6) into a 45° position.
● The ball valve (6) should be fully open for
correct operation of the system.
● To prevent incorrect operation it is
recommended that an additional gravity
brake is installed in the flow line (from
the collector to the cylinder) (part of the
standard delivery of the SAS SOKI cylinder
connection set).
2.9 Safety equipment
● The SOKI is equipped with a 6 bar safety
valve: this must be easily accessible.
● The blow-down line diameter must be
identical to the diameter of the valve outlet
port; the line may be a max. of
2 m long. Select a blow-down line with a
diameter which is the next size up if this
maximum value is exceeded (2 bends, 2 m
long line). Never install more than
3 bends and a 4 m long line.
● The drain line must have a diameter twice
as large as that of the valve inlet port, if
the blow-down line is routed into a blow-
1" flat packing with
down line with funnel. Furthermore ensure
union nut
that the blow-down line is routed with a
Flow rate adjustment
slope; the outlet must be open and visible
and be routed so that no personnel is put
at risk during blow-downs.
● It has proven practical to place a container
underneath the blow-down line. When the
safety valve responds, fluid is collected and
can be returned to the system again (if the
pressure inside the system has dropped
too low).
Scale
2.10 Pump settings
The flow meter (8) is a throughput measuring
device with an integral and adjustable flow
¾" connection
rate limiter. It has a display range of 1 to
(fem. thread)
13 l/min.
Adjust the flow rate at the rotary selector
of the pump (7) (check it at the flow meter).
Operation
For SOL 20 plus, SOL 23 plus, SOL 25 plus
setting
and SOL 27 plus collectors, adjust the flow
rate to approx. 5 l/min/ assembly (or 300 l/h/
assembly). For the SOL 20 SI collectors, adjust
the flow rate to 80 l/h/collector.
E
B
F
11
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