0503RHC8RJLGBEN
23/34
6.0 SERVICING INSTRUCTIONS
IMPORTANT:
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.
Reznor RHC 8000(M) RJL 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.
WARNING:
Excessive dirt buildup 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.
CAUTION:
When cleaning air heaters, wearing of eye protection
and a dust face mask is recommended.
6.1 S
ERVICE PROCEDURE
The following procedures should be carried out at least
annually:
1. Remove the burner assembly as in section 7.1. Clean
thoroughly, (cleaning the burners requires an emery
cloth, wire brush and a cleaning cloth -stubborn deposits
on burners are best cleaned using
"acetone"
as a
solvent).
*Check the condition of the igniter and clean to remove
all deposits. Check the spark gap (3,0 mm).
*Check the sensor - clean as necessary.
* Remove any soot deposits from the burner with a wire
brush. Clean the ports with a degreaser or acetone. A
vacuum cleaner or compressed air may assist in this
cleaning operation. Wipe the inside of the burner tube
clean (cleaning thoroughly with a degreaser as
recommended will retard future buildup of dirt).
Inspect the burner for any damage or deterioration. If
the burner is damaged or corroded, replace it.
2. The heat exchanger should remain clean unless a
problem has developed due to poor combustion.
Examine the heat exchanger tubes internally and
externally for any sign of deterioration. The outside of the
tubular heat exchanger can be cleaned from the front of
the heater with an air jet and/or a flexible brush. Remove
any dust and grease deposits. The inner surfaces of the
heat exchanger can be reached for cleaning with the
burner and combustion air fan (venter) assemblies
removed, (see figures 13/14 and section 7). Clean with a
flue brush or a heavy wire to which wire wool has been
attached. Brush inside each heat exchanger tube until all
foreign material has been removed. The use of a
flashlight is necessary to carry out this operation.
3. Remove any dirt and/or grease that may have
accumulated on the venter fan motor and its housing.
NOTE:
Venter fan motors are lubricated for life and do
not require greasing.
4. The gas multi-functional control valve requires no field
maintenance except cleaning of it's exterior and
checking the condition of the wire connections.
Instructions for testing pressure are given in section 5.5.
5. Check the flue/combustion air system for soundness.
Reseal/replace any parts that are not sound.
6. Check all wiring connections. Check wiring for any signs
of damage. Replace any suspect wiring with an
equivalent specification.
7. Check operation of thermal fan control and control relay.
8. When service is complete carry out full commissioning
procedure as per section 5 of this document.
7.0 REMOVAL & REPLACEMENT OF
PARTS
RHC 8000(M) RJL air heaters must only be fitted with
Reznor authorized replacement parts. These heaters
must use certificated spare parts to comply with
legislation.
7.1 M
AIN BURNER REMOVAL
7.1.1 Instructions for burner removal
(see figure 13):
1. Turn OFF the gas supply to the air heater.
2. Switch OFF the electricity supply to the air heater.
3. Open
the
access
door.
4. Disconnect the union in the gas supply outside of the
appliance.
5. Remove gas supply pipe from multi-functional gas
control valve.
6. Disconnect flame sensor wire from flame sensor and the
high tension ignition wire from the burner relays.
7. Disconnect the silicon tube from the static tapping point
on the burner box cover.
8. The burner rack assembly is now visible.
9. At the bottom and top of the burner rack assembly,
remove the 2 nuts that secure the burner rack to the
burner box bottom and top. Lift the burner rack/manifold
assembly upward and pull the assembly out of the air
heater.
