Glow-worm Ultrapower sxi Series Installation And Servicing page 64

15.24 Plate-to-Plate Heat Exchanger
For access, refer to section 15.1.
Refer to section 15.1 to drain the boiler heating circuit.
Refer to section 15.1 and drain the boiler domestic water
circuit.
Refer to diagram 15.20.
Remove the four screws securing the plate-to-plate heat
exchanger to the hydroblock.
There will still be water present so carefully pull the plate-to-
plate heat exchanger upwards to remove.
When replacing the plate-to-plate heat exchanger ensure that
the four rubber seals are fitted into the hydroblock.
NOTE: The plate-to-plate heat exchanger only fits one way.
Open the cold-water isolation valve and slowly open a hot
water tap to remove air.
Close the hot water tap and check for any leaks.
Open the heating circuit isolation valves, re-pressurise the
system as necessary.
15 Replacement of Parts
64
PLATE TO PLATE
SECURING
HEAT EXCHANGER
SCREWS (4)
Diagram 15.20