Page No 38 of 52 Reznor, RHC21 8000 Installation EN May 2021 D301319 Issue 0
7. With the burner removed the integrity of the
combustion chamber and tube insulation can
be verified. It is normal for small superficial
cracks to be present in the surface of the
insulation.
8. Remove any debris from inside the burner
chamber. A vacuum with a minimum of M
Class dust extraction rating can be used. Do
not use compressed air.
9. Check the integrity of the insulation. Use a
torch to inspect the insulation sleeves fitted
into each tube. Broken tube inserts or the
presence of deep cracks or warping indicate
that the insulation needs to be replaced.
10. To remove the chamber insulation the burner
probes must first be removed. See cleaning
and replacement of burner probes for
procedure.
11. With the burner probes removed the
insulation block can be pulled out from the
chamber. This will reveal two additional
thin strips of insulation material. The first is
located at the front of the chamber where
the tubes are secured. The second is located
on the lower right side of the chamber
where the probes are normally located. It
is recommended that both of these thin
insulation strips are replaced whenever the
cast insulation block is removed. Ensure
the lower right insulation strip has the
preformed holes lined up with the probe
holes in the side of the chamber.
12. The tube inserts can now be accessed and
withdrawn from the tubes.
13. Refit replacement tube inserts, tube insert
spacer gaskets and chamber insulation
ensuring the chamber insulation is correctly
orientated, so the cut outs line up with the
burner probe position.
14. Confirm the tube inserts slot into the
corresponding recess in the front face of
the chamber insulation block and gently
pull them towards the chamber insulation.
Ensure there are no gaps between the
chamber insulation and tube inserts. Up
to three tube insert spacer gaskets may be
needed per tube insert.
Tube insert
Chamber
insulation
Probes
Chamber
front
insulation
Chamber
side
insulation
Tube inserts
Tube insert
spacer gasket
Probe
cut outs
