8.0
INSTALLATION
24
Publication No. 5106451
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, , N, PF
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
J1 Out
J2 In
J3 In
Promax 24 HE
J1 In
J2 In
J3 In
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
o
3.
c)
Replace the PCB and continue with the
installation.
5. Route the incoming electrical cable/s through the
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 ( ) wires to the
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.
Fig. 31
Fig. 31a
Fig. 32
Fig. 33
S/L
N
Electrical Box
Cover
Cable Clamp
Grommet
Electrical box shown
removed for clarity
P/F
Control PCB
Jumper 2
Fig. 32a
Jumper 1
Jumper 3
