6.6.4
Connection options for the standard PCB
Connecting the PWM pump
The energy-efficient modulating pump must be connected to the standard
PCB of the PCU. Proceed as follows:
1. Connect the power supply cable and the cable for the PWM signal to
the pump.
2. Remove the grommet from the opening in the middle of the base of
the boiler.
3. Pass the pump power supply cable through the base of the boiler
and seal the opening by tightening the bayonet fitting to the cable.
4. Pass the PWM cable from the pump through one of the grommets
on the right in the base of the boiler.
5. Connect the pump power supply cable to the cable in the instrument
box that is connected with connector X8.
6. Connect the pump PWM cable to the cable in the instrument box
that is connected with connector X10.
7. Add the pump cables to the cable bundles by opening and closing
the cable bundle bands.
Fig.19
Connecting the power supply cable
AD-0000038-01
2
3
X81
X116a
4
X120
1
X10
X8
X81
X81
PWM
5
6
7
6 Installation
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123157 - v.12 - 07022018