Potterton Prorile Prima 30e Installation And Servicing Instructions page 24

SERVICING INSTRUCTIONS - Page 24
the Boiler for Servicing', operations A, B and C.
3. Remove main burner as described in 'Preparing the Boiler for
Servicing', operations G, H, I, J & K
4. Bend back retaining tabs and replace insulation. It is
necessary to first remove the side insulation when replacing
the rear.
5. Replacement is the reverse of removal.
6. Follow the full commissioning procedure as detailed in the
COMMISSIONING section of these instructions. Page 18.
FUSE, ELECTRONIC CONTROL, PRESSURE SWITCH,
BOILER THERMOSTAT, OVERHEAT THERMOSTAT,
PUMP OVERRUN THERMOSTAT
The following initial operations 1-3 are necessary to
remove and replace any of the above items.
1. Switch off the external electricity supply by disconnecting the
plug at the socket or switching off the external isolating
switch.
2. Remove controls cover by opening the door covering the
securing screw on the underside of the controls cover see
FIG. 13. Undo securing screw, pull controls cover forward
10mm, lower it to release it from its four side fixings and pull
forward clear of the thermostat knob.
3. Remove control box securing screw and lower control box.
FUSE 1 amp
4. The fuse is located on the electronic control and can be
replaced by lifting it from its holder.
5. Replacement is the reverse of removal. Refer to
FIGS. 26 & 27.
ELECTRONIC CONTROL
4. Disconnect six way plug, two way plug and electrode lead
from the electronic control. Refer to FIGS. 26 & 27.
Disconnect the flying leads of the electronic control as
follows:-
white wire from terminal C(3) of the control thermostat
white wire from terminal NC (2) of the control thermostat
brown wire from overheat thermostat
blue wire from boiler terminal block connector N
green/yellow wire from earth post
5. Release the control by lifting it from the four retaining lugs.
6. Remove electronic control.
7. Replacement is the reverse of removal.
8. Follow the full commissioning procedure as detailed in the
COMMISSIONING section of these instructions. Page 18.
PRESSURE SWITCH
4. Remove the screw securing the pressure switch to the
bracket in the control box. Lift pressure switch from bracket.
5. Disconnect the two plastic tubes. NOTE: the red tube is
connected to the pressure switch connection identified with a
red ring, or adjacent red spot.
6. Disconnect the three electrical leads, white wire from terminal
No. 1 or NC, orange from terminal No.2 or NO and brown
from terminal No.3 or C. Refer to ~ FIGS 26 & 27.
7. Replacement is the reverse of removal. Ensure that the
plastic tubes have the coiled springs positioned to prevent the
tubes from kinking.
8. Follow the full commissioning procedure as detailed in the
COMMISSIONING section of these instructions. Page 18.
OVERHEAT THERMOSTAT
4. Remove door by undoing the two lower fixing screws and
lifting door off the two upper hinge brackets.
5. Disconnect the two push on electrical connections from the
overheat thermostat terminals.
6. Remove the nut securing the overheat thermostat to its
mounting bracket.
7. Noting the route taken by the capillary, remove split pin
retaining the thermostat bulb and withdraw bulb from its
pocket. Remove the split grommet in the base of the boiler,
feed the thermostat capillary and bulb through the hole.
8. Replacement is the reverse of removal. Ensure the rubber
grommet in the base of the boiler makes a good seal around
the capillary. Ensure that the capillary is secure in the clips
provided. Refer to FIG. 2. The bulb of the new thermostat
should be coated with heat conducting paste.
9. Follow the full commissioning procedure as detailed in the
COMMISSIONING section of these instructions. Page 18.
BOILER THERMOSTAT
4. Remove door by undoing the two lower fixing screws and
lifting door off the two upper hinge brackets.
5. Disconnect the electrical connections as follows:-
White from terminal 0(3). White from NC(2) Refer to FIGS. 26
& 27.
6. Pull off the outer thermostat knob.
7. Remove inner thermostat post by undoing the two securing
screws.
8. Remove the nut securing the thermostat to the control box.
9. Remove the clip securing the thermostat bulb to the flow
pipe.
10. Remove the split grommet in the base of the boiler. Feed the
capillary and bulb through the holes.
Replacement is the reverse of removal. The bulb of the new
thermostat should be coated with heat conducting paste.
Ensure the rubber grommets in the base of the boiler make a
good seal around the capillary.
Ensure that the capillary is secure in the clips provided.
Follow the full commissioning procedure as detailed in the
COMMISSIONING section of these instructions. Page 18.