GIRBAU PB32 Series Installation, Operation And Maintenance Instructions Manual page 59

Models with gas or steam heating (Fig. 5.5)
On these models, the connection is ALWAYS SINGLE-
PHASE or TWO-PHASE. However, it can be connected to a
three-phase installation. (See the wiring diagrams in section
4.2).
Connect the power supply wires to input terminals L1 and L3
of the isolator switch.
Connect the earth wire (PE/GND).
Pass the cable through the conduit and secure it with the clip
A.
Model PB/PBP51, X20 with electrical heating
Connect the power supply wires to input terminals L1, L2 and
L3 of the isolator switch.
Connect the earth wire (PE/GND).
Pass the cable through the inside of the base-frame as
shown in the figure.
Steps for the connection
59
Fig. 5.5
Fig. 5.6
Code no. 550038
Rev. no. 16/1018