Page No 36 of 56 Reznor, RHC21 4000 Installation EN May 2021 D301334 Issue 0
6 Servicing and maintenance
Only appropriately qualified
persons may carry out servicing
and fault finding on this gas fired
equipment.
Before commencing service ensure
that both the gas and the electricity
are turned and switched “OFF”
and that the air heater has cooled
down.
Inadvertent substitution or
replacement of components similar
to those specified or replacement in
a manner contrary to the method
herein described could constitute a
hazard and lead to prosecution.
Always consult your distributor at
the slightest doubt.
RHC21 4000 air heaters will operate with a
minimum of maintenance. To ensure long life
and satisfactory and safe performance, an air
heater that is operated under normal conditions
should be inspected and cleaned at the start of
each heating season. If the air heater is operated
in an area where unusual amounts of dust, etc.
are present in the air, more frequent servicing is
recommended.
When any service is completed, be sure that
components are reassembled correctly to ensure
that no unsafe condition exists.
Upon completion of the service carry out the
commissioning instructions outlined in section 5
of this document.
Excessive dirt build up on the inside
of the burner ports could cause
unburned gas to spill out of the
back of the burner tube causing a
fire or explosion. To prevent this
occurring, clean all of the burner
ports at least annually.
When cleaning air heaters, wearing
of eye protection and a dust face
mask is recommended.
6.1 Service procedure
The following procedures should be carried out
at least annually:
• Check the heat exchanger internally and
externally for evidence of physical damage.
• Check the burner for scale, dust, or lint
accumulation. Clean if required.
• Check the vent or vent/combustion air
system for soundness. Replace any parts that
do not appear sound.
• Check the wiring for any damage. Replace
damaged wiring.
6.2 Heat exchanger maintenance
Remove any external dirt or dust accumulation.
Visually check the heat exchanger for cracks and
holes. If a crack or hole is observed, replace the
heat exchanger.
