Pos. 22: Solaris flow —
stratification pipe – only GSU
The stratification pipe routes the
unpressurised cylinder water heated up by the
collectors with low impulses into the cylinder.
This ensures that it flows to the precise level
inside the cylinder matching the solar flow
temperature. The temperature stratification
inside the cylinder remains intact.
Pos. 23: Heating circulation pump
Circulation pump for heating operation and
cylinder heating. The screw cap on the
automatic air vent valve (pos. 38) must remain
open.
Pos. 24: Modulating gas burner
Ask a contractor to carry out a service/
cleaning of the gas burner annually.
Such work must only be carried out by
qualified personnel. For a description,
see page 5.1.
Pos. 25: Three-way diverter valve
The three-way diverter valve changes over
between heating mode and cylinder heating.
When filling the heating system for the first
time, lock the three-way diverter valve in its
central position. For this, ensure the power
supply cable is pulled off (standard delivery
condition) or pull it (Fig. 2.2.2). Plug it back into
the servomotor no sooner than one hour after
commissioning.
Note:
The central position remains
stable only when the valve is at
zero volt. The valve resets itself
automatically when the servomotor is
supplied with power to drive into the valve
positions AB-A (cylinder heating).
1
Boiler return
2
Heating return
3
Cylinder heating return
4
Three-way diverter valve
5.1 Valve servomotor
5.2 Reset button of the servomotor lock
5.3 Lever
Pos. 26, 27: Flow (26) and return (27);
temperature sensor
The sensors (type NTC) are screwed into the
waterways of the boiler body. The sensor
leads can be plugged in. The sensors are
directly connected to the gas burner control
unit. This also safeguards the low water
indicator and high limit safety cut-out
functions.
Pos. 28: Flue gas temperature sensor
The sensor (type Pt 1000) is screwed into the
flue gas channel of the boiler body
immediately upstream of the flue outlet. The
sensor lead can be plugged in. The control unit
fulfils a limiter function and shuts the burner
down if the flue gas temperature is ever
exceeded. A maintenance message will also
be generated, if the flue gas temperature
exceeds the typical maximum boiler values.
Pos. 29: Safety valve
The GSU/GCU is equipped with a safety valve
(3.0 bar). Connect a permanently open blow-
off line without restrictions to its internal
diameter in accordance with EN 12828, to
ensure that the safety valve can always and
correctly function (the outlet must be
unrestricted and must be visible).
Pos. 30: Diaphragm expansion vessel -
connection
At this point or somewhere else in the heating
system, connect a diaphragm expansion vessel
to EN 13831 via a permanently open line in
accordance with EN 12828 and DIN 4807.
Pos. 31: Boiler control panel
Central user interface for the display and
adjustment of operating parameters; see the
separate description (chapter 4).
Comprises the control electronics and all
electrical connections.
[ 10 ]
Fig. 2.2.2: Fill position of the three-way
diverter valve
Summary of Contents for GasCompactUnit Series
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