Watts FRG3020-W Manuel De Montage Et D'utilisation page 10

5.2. E
LECTRICAL CONNECTIONS
All electrical connections are to be carried out only by an authorised specialist according to the local electrical instal-
lation regulations. The electrical wiring must not come into contact with any hot parts or components.
The circulating pump, the 3-point actuator as well as the temperature limiter (if supplied) are supplied already wired ex-
works. The supply temperature sensor is also already connected to the controller. The outside temperature sensor is to
be connected on site.
To ensure that the pump only runs when heat is required, the manufacturer recommends connecting the pump to a
pump relay (e.g. the pump logic of an electric control manifold which also controls the actuators). Alternatively the
pump can be controlled by a timer or through the room thermostat in a reference room. Details of electrical wiring
can be found in the climate controller documents.
 Climate controller installation and operating instructions;  Pump installation and operating instructions;
 Temperature limiter installation and operating instructions
Connection options for temperature limiter (TB) or
pump logic (PL) of a control manifold (optional).
The connection is supplied ex-works with a cable bridge.
This is to be removed if a TB or PL is to be connected.
AXM117
red
blue
white
(heat generator...)
CLOSE
COMMON Com
OPEN
5.3. T
EMPERATURE LIMITER
In case of a fault the TB switches off the circulating pump and prevents overheating. To avoid unintentional triggering,
the temperature of the TB should be set a few degrees above the required supply temperature. In common practice, the
maximum temperature is around 55 °C. This corresponds to the works setting of the TB. The maximum temperature
should, if required, be adjusted to suit local conditions.  6.3
Where all heating circuits are fitted with actuators and no pump relay is used, the TB should be installed on the
supply of the heating circuit manifold. Depending on the equipment and mainly with HKV with 2 to 4 outlets, the TB is
installed on the collective return pipe.
The maximum supply temperature can also be set through the controller ( Heating controller installation and
operating instructions).
6. COMMISSIONING
6.1. F
LUSHING THE HEATING CIRCUITS
Connect the control unit to the pipe network and shut it off from network (using ball valves (15) from the heating cir-
cuit manifold HKV delivery or a shut-off device fitted on site). Switch the pump off and shut all heating circuits and
manifolds. It suffices to shut off only the valves in the return collector of the HKV using the protective caps.
Then fill the manifold and the control unit with heating water (Fig. 5a) in accordance with VDI 2035, connecting the
filler hose to the SBE return (9b) and the draining hose to the SBE supply (9a). Heating circuits are closed. Open the
SBE and fill the control unit until water comes out of the SBE supply. Close both SBEs.
MuB_10026618_FRG3020-W_(EN)_2010-08-16.docx
Pump 1
Mixer circuit
Power supply
230 V AC
50 Hz
L N N
COLD port
or pump 2
HEAT port
C CLOSED
N
O OPEN
(
IF INCLUDED IN SUPPLY
L
)
Subject to technical change without notice
EN
Outside temperature
sensor (cable)
Return temperature
sensor
(optional)
Supply temperature
sensor
Fig. 5
Page4