Potterton Promax 15 HE Installation And Servicing Instructions page 22

Electrical Box
Cover
Fig. 31
Fig. 32
Cable Clamp
S/L N
Fig. 33
22
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Grommet
Fig. 31a
Electrical box shown
removed for clarity
Jumper 1
Jumper 2
Fig. 32a
Control PCB
P/F
8.0 Installation
8.8 Making The Electrical Connections
WARNING: This appliance must be earthed
1. The electrical connections are on the right hand
side of the unit inside the electrical box.
2. Undo the two screws securing the electrical box
cover and remove the cover (Fig. 31).
3. Undo the two screws securing the SL,
cable clamp and place to one side (Fig. 32).
4. The boiler is factory set to give a flow
temperature set point of 82°C. The Control PCB
jumper positions are as follows:
Promax 15 HE
Promax 24 HE
This will ensure that the desired room temperature
and domestic hot water temperature will be
achieved but will not give the most energy efficient
operation of the boiler. If the desired room
temperature and domestic hot water temperature
will still be achieved with a 63° C flow temperature,
this will give the most energy efficient operation of
the boiler and the boiler can be adjusted as follows:
a) Draw the control PCB forwards out of the
electrical box (the control PCB is the right
hand board).
b) Remove jumper n
c) Replace the PCB and continue with the
installation.
5. Route the incoming electrical cable/s through the
Jumper 3
grommet in the support bracket. This will prevent
damage to the cable (Fig. 31a).
6. 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).
7. Connect the (S/L), (N) and (
4-way terminal block and refit the cable clamp
(Fig. 33).
8. The pump can be wired directly to the system
controls or to the P/F connector on the boiler. For
full TRV installation refer to section 6.1.
9. The P/F connection should only be used on a
full TRV system without a bypass.
10. Check the electrical installation for;
earth continuity, short circuits, resistance to earth,
correct polarity and fuse failure.
11. Replace the electrical box cover and secure.
, N, PF
J1 Out J2 In J3 In
J1 In J2 In J3 In
o 3.
) wires to the