Supplied By www.heating spares.co Tel. 0161 620 6677
30
Tempra 12 / 18
Spark or flame detect electrode
(fig. 28)
• Isolate gas and electricity supply
• Remove outer case (two screws bottom rear
corners)
• Open room sealed compartment and combustion
chamber
• Identify electrode from fig. 28
• Unplug electrical connection "A" from sensing
electrode
• Remove fixing screw and remove flame detect
electrode
• Remove the two fixing screw from spark electrode
plate and remove it.
• Replace in reverse order, spark gap 3.5 mm
Fig. 28
Spark
A
Flame detect
Pump
(fig. 29)
Replacement of pump head
• Isolate electricity and flow and return pipes
• Remove casing (two screws bottom rear corners).
• Remove the two securing screws and lower
control panel
• Release pressure from boiler via suitable drain point
• Unplug the pump lead "A" from the pump head
• Place a piece of cloth or other absorbent material over
the rear of the control panel to catch any drops of water
that may fall when the pump head is removed.
• Using a 4mm allen wrench undo the four allen
screws "B" in the pump head, lift away pump
head from the pump body
• fit new head into pump body and secure with the
allen screws tightening evenly.
• Replace electrical connection.
• Refill system and vent pump
Replacement of pump body
(fig. 29)
• Proceed as for removal of pump head
• Disconnect the expansion vessel connecting pipe "E" from the rear of the pump body by removing
the U clip from the left hand side
• Disconnect the boiler return pipe and disengage the pump lower connection by removing the U clip "C"
• Disconnect the pump to heat exchanger connection by removing the U clip "F"
• Unscrew the two screws on bottom of pump "D"
• Turn the pump body through 90°, pull the bottom forward and withdraw the pump body
• Reassemble in reverse order taking care to ensure the O-rings are in place and undamaged.
• Refill system and vent pump
Fig. 29
Removal of heat exchanger
• Isolate gas, water and electricity supplies
• Remove casing (2 screws bottom corners)
• Remove the two securing screws and lower control panel
• Drain the boiler
• Remove sealed compartment front panel
• Disconnect the overheat thermostat and central heating limit thermostat
• Remove the main burner, fan, flue hood as described previously
• Remove the pump to heat exchanger flow connection and locknut
• Lift out heat exchanger
• Re-assemble in reverse order
• Refill and TEST
B
D
C
A
F
E
