Potterton Promax SL range Installation & Service Instructions Manual page 36

Fig. 31
Cable Clamp
4-way Terminal Block
S/L N
Fig. 33
36
© Baxi Heating UK Ltd 2014
Hinge down
PCB Housing
Blue (CN11) Jumper
Red (CN12) Jumper
Optional Pump Feed Connection
P/F
only required for fully TRV'd system
10.0 Installation
10.8 Making The Electrical Connections
WARNING: This appliance must be earthed
1. The electrical connections are on the right hand side of
the unit.
2. Undo the two screws securing the cable clamp and place
to one side (Fig. 31).
3. The Promax 30 SL is factory set to give a maximum
output of 22.0 kW (75,000 Btu/hr). The Control PCB
jumper positions are as follows:
CN11 (Blue)
If the installation requires a greater output to achieve the
desired room temperature, this can be increased to 30.18
kW (103,000 Btu/hr) and the boiler can be adjusted as
follows (Fig. 32):
a) Remove the top right hand securing screw and
hinge down the PCB housing.
b) Remove the Red jumper labelled CN12 from the
bottom left hand side of the PCB.
c) Hinge back up the PCB housing and secure with
screw.
4. Route the incoming electrical cable/s through the
grommet in the support bracket. This will prevent damage
to the cable.
5. Lay the cable through the cable clamp to gauge the length
of cable required when it is connected to the 4-way
terminal block.
Fig. 32
6. Connect the (S/L), (N) and (
4-way terminal block (Fig. 33) and refit the cable clamp
(Fig. 31).
7. Check the electrical installation for;
earth continuity, short circuits, resistance to earth, correct
polarity and fuse failure.
CN12 (Red)
) wires to the