8.0 Installation
22
8.7
Making The Electrical Connections
WARNING:
This appliance must be earthed
1. The electrical connections are on the left hand
side of the unit behind the facia 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 maximum
output of 22.0 kW (75,000 Btu/hr). The Control
PCB jumper positions are as follows:
J1 In
J2 In
J3 In
If the installation requires a greater output to
achieve the desired room temperature, this can be
increased to 31.18 kW (103,000 Btu/hr) 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 all three jumpers.
c)
Replace the PCB and continue with the
installation.
If the boiler is to be used in conjunction with a
Thermal Store, the boiler can be adjusted as
follows (Fig. 32a):
a) Draw the control PCB forwards out of the
electrical box (the control PCB is the right
hand board).
b)
Remove jumper n
o
2.
c)
Replace the PCB and continue with the
installation.
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 ( ) wires to the
4-way terminal block and refit the cable clamp
(Fig. 33).
7. The P/F connection should be used as a
external pump live feed when fitting an extra pump
to the system boiler on a fully TRV’d system with
no bypass. If the S/L connection is used, this will
not protect the external pump if all TRV’s shut
down in a full TRV system.
8. Check the electrical installation for;
earth continuity, short circuits, resistance to earth,
correct polarity and fuse failure.
9. Replace the electrical box cover and secure.
Fig. 31
Fig. 32
Fig. 33
S/L
N
Electrical Box
Cover
Cable Clamp
P/F
S/L = Switched live to the Boiler from the
System Controls.
P/F = Optional Pump Feed, only need
be used when fitting an additional
external pump on a full TRV system
without a bypass fitted.
Control Board
Jumper 1
Fig. 32a
Jumper 2
Jumper 3
