Potterton Housewarmer 45, Installation & Service Instructions Manual, Page: 16 / 45

4. Installation – Page 16
4.3 Electrical Connections
The boiler and all external control circuit wiring must be
supplied from the same single isolating switch or plug and
socket, and should be fused at 3A.
Care must be taken to ensure that all wiring to the boiler will
not contact any sharp edges or hot surfaces.
We recommend that the supply be routed within the opening
and clipped to the side of the recess.
Use Fig. 17. as a reference for connecting the following
components:-
1) Connect the user controls plug onto its socket on the
electronic control box and secure the harness using the
cable clips.
2) Connect the electrode lead plug onto its socket on the
electronic control box.
3) Connect the gas valve plug onto its socket on the
electronic control box and secure the harness using the
cable clips.
4) Connect the control stat plug onto its socket on the
electronic control box.
5) Route a 4 core cable under the cable clamp and
connect to the 6 way terminal block as follows:-
Systems Using Pump Overrun Facility
Re-position link LK1 on the electronic control box so the link
wires are to the top of the board
(Gravity Link Broken).
Permanent live to terminal marked MAINS 'L'.
Neutral to terminal marked MAINS 'N'.
Earth to terminal marked '
'.
Switched live from external controls to terminal marked
MAINS 'SwL'.
Following the pump manufacturers instructions, connect the
pump supply wires to the terminals marked 'Pump' L, N &’
‘on the terminal block and secure using the cable clamp.
Note: Ensure that the earth connector is longer than the L, N
& SwL from the point of anchorage, so that the current
carrying conductors become taut before the earth conductor.
Systems NOT Using Pump Overrun Facility
Switched live from external controls to terminal marked
MAINS 'SwL'.
Neutral to terminal marked MAINS 'N'.
Earth to terminal marked '
'.
The link LK1 should be left with the link wires to the bottom
of the board
(Gravity Link Connected).