Potterton LPG 50e Installation And Servicing Manual page 16

INSTALLATION INSTRUCTIONS - Page 16
FIG. 21 OVERHEAT THERMOSTAT BULB
POSITION
Ensure that the system change-over switch in the control
box is correctly set e.g. for GRAVITY DHW system or
FULLY PUMPED system. See FIG. 2.
If the boiler is to be used on a GRAVITY DHW system the
bulb of the overheat thermostat must be repositioned as
shown in FIG. 21. To do this loosen the plastic retaining
screw and withdraw the thermostat bulb from its pocket.
Position the bulb as illustrated and secure it by finger
tightening the plastic screw. Do not over-tighten.
FIG. 23 ACCESS TO THE BOILER ELECTRICAL
TERMINAL BLOCK
ELECTRICAL
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 is kept clear of sharp
edges and hot surfaces.
FIG. 22 PRINCIPLE OF WIRING
The boiler terminal block which is situated in the control box
is not designed to accept wiring from all the on site controls
and therefore the installer will usually need to incorporate a
suitable junction box. This may not be required if a Potterton
Electronic Programmer is used as this incorporates a
junction box. The principle of wiring is shown in FIG. 22.
Further information on wiring of system controls can be
found in the Control System, Pipework and Wiring Guide.
Remove control box securing screw and lower the control
box to gain access to the boiler terminal block.