BENSON VRC-3 100-3, Инструкция по установке, обслуживанию и эксплуатации

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1704VRC3-AMEN, p 25/35
Service procedure
The following procedures should be carried out at least annually:
1. Remove the burner assembly as in section 8.1. 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 ignitor 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
build ‐ up 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. 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. Clean the axial fan blades, fan guard, and fan motor to remove all external dirt . Check the security of
the fan on the motor.
Note : Fan motors are lubricated for life and do not require lubricating.
4. Remove any dirt and/or grease that may have accumulated on the venter fan motor and its housing.
Note: The combustion air fan motors are lubricated for life and do not require oiling or greasing.
5. The gas multi ‐ functional control valve requires no field maintenance except cleaning of its exterior
and checking the condition of the wire connections. Instructions for testing pressure are given in
section 6.6.
6. Check the flue/combustion air system for soundness. Reseal/replace any parts that are not sound.
7. Check all wiring connections. Check wiring for
any signs of damage. Replace any suspect wiring with an equivalent specification.
8. Check operation of thermal fan control and control relay.
9. When service is complete carry out full commissioning procedure as per section 6 of this document.
Removal & replacement of parts
VRC ‐ 3 air heaters must only be fitted with authorized replacement parts.
These heaters must use certificated spare parts to comply with legislation.

Remember! After any service work has been carried out, the air heater must be
fully commissioned.
See section 6 of this document
8.1 Main burner removal
Instructions for burner removal (see figure 8):
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. At the burner rack assembly, remove the nuts that secure the burner
manifold to the burner rack. Lift the burner rack/manifold assembly
upward and pull the assembly out of the air heater.
8
Figure 8
(for clarity, heater
cabinet & other parts are not
illustrated