Nortek Reznor VRA-4E Series, Установка, пусконаладка, обслуживание

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1712VRA ‐ 4EGBEN, pag.. 14/25
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.
VRA-4E 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 6
of this document.
WARNING: Excessive dirt build-up on the inside of
the burner ports could cause unburnt 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.
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.
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