Watts FRG3020-W Manuel De Montage Et D'utilisation page 11

To fill and flush the heating circuits (Fig. 5b), connect the filler hose to the SBE supply (9a) and the drain hose to the
SBE return (9b). Open the heating circuit to be flushed. Open the SBE and flush the heating circuit in flow direction
until air and any contaminants are completely cleared from the circuit.
The check valve (14) in the mixer bypass precludes any short circuit route when flushing.
Repeat procedure for all heating circuits.
14
10
15
Important: The heating circuits must only be flushed in the flow direction, i.e. the water must enter through the supply
manifold and exit through the return.
Draining must always be open as otherwise the high water pressure could damage the heating unit. The instructions
for flushing as described in the installation and operating instructions must also be observed.
7. MANIFOLD CONTROL UNIT MODE OF OPERATION
The control unit mixing valve is designed as a proportional controller and is controlled through a thermostatic head
with a capillary tube and a sensor element in the heating circuit supply. Deviations from the set point value immedi-
ately trigger a valve setting change so that the flow of hot water from the boiler circuit changes according to the
amount of water injected. The injected water mixes with the return water from the heating circuit and thus maintains
a constant supply temperature within a narrow temperature range.
The respective heating circuit supply temperature can be read directly from the thermometer.
A check valve is located between the supply and return flow sockets which prevents any short circuit of the primary
circuit. Any short circuiting is also prevented when filling and flushing the heating circuit.
8. TECHNICAL DATA/MATERIALS
Max. ambient temperature:
Max. media operating temperature:
Max. operating pressure:
Control range of supply temperature:
Nominal thermal rating:
Operating voltage:
Pump capacity:
Fittings:
Pipe parts:
Plastic:
Flat gaskets:
O-rings:
1) The control range of the supply temperature is determined by the selection from the heating/cooling curve.
MuB_10026618_FRG3020-W_(EN)_2010-08-16.docx
9a
9b
Fig. 5a
0 - 50 °C
0 - 80 °C
6 bar
1)
5 - 100 °C
ca. 14 kW
230 V – 50 Hz
Depending on pump type, for details see name plate and  Circulating
pump installation and operating instructions
Brass Ms 58
Brass Ms 63
Impact and temperature resistant
AFM 34 or EPDM
EPDM
10
Subject to technical change without notice
EN
9a
9b
14
15
Fig. 5b
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