Instruction manual V 2.3
10
PWM 230 - PWM 400 - PWM 400/7.5
Instruction manual
PWM400 and PWM400/7.5 must be installed only in vertical position
, while PWM230
can be installed in any position. Internal pipe where water flows shows horizontal or vertical direction, while
the arrows on the same pipe show flow direction.
Ice/Frost
danger: Pay attention to the environmental conditions where the PWM will be
installed and to the electrical connection in the cold months. Two types of usage precautions should be
observed in case that environment temperature drops below 0°c.
- If PWM is working it is absolutely necessary to protect it adequately from the cold and to keep it constantly
fed.
- If PWM is not working it should be disconnected both from power supply and from the pipes and any water
inside it should be removed. To ease this procedure a quick release coupling is advisable.
Please note that removing pressure from the pipeline is not enough, since after doing that some water still
remains inside the PWM.
Note:
If PWM is disconnected from power supply, the anti-freeze protection does not operate (see sec.
5.1.3.8).
Foreign bodies in the pipeline: the presence of dirt inside the fluid can obstruct the duct or
stop the flow valve, thus jeopardizing correct operation of the system. In case that the PWM is installed on a
pipeline through which foreign bodies (e.g. gravel in case of submersibles pumps) can transit, it is necessary
to install a special filter upstream from the PWM. A coarse porosity one (100
µ
m) will be suitable as well.
2.2 Electrical
connection PWM 230
Power supply to the PWM 230 should meet the following requirements:
Rated voltage
230 V (+ 10% / - 20%)
Minimum absolute voltage
184 V (230 V - 20%)
Maximum absolute voltage
264 V (240 V + 10%)
Frequency
50 / 60 Hz
Table 2: PWM 230 power supply requirements
DANGER
Electric shock risk
Before carrying out any installation or maintenance operation, the PWM should be disconnected from the
power supply and one should wait at least 2 minutes before opening the appliance.
Ensure that rated voltage and the frequency values of the PWM match those of the Power
supply.
WARNING
Power supply voltage can change when the pump is turned on by the PWM device.
The power line voltage can change, due to connection of other devices and to the quality of the power line
self.
2.2.1
Connection to the PWM 230 power supply line
Normally PWM devices are equipped with a power cord to connect the device to a 220V-240V single-phase
electric line, but some versions are not. In those versions the electric line must be connected to the 3 ways
terminal “J2” with “LINE” silk-screened on it (see Figure 2).
