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Supplementary maintenance.
The particular feature of the coating is the fact that it can be reapplied. Solid particles (like sand) can enter from the side of the coil
where air flows in, and erode the corrosion protection exposing the metal. Should this happen, the surface coating must be reapplied.
Reapplication should be carried out by qualified personnel.
The coating can be reapplied several times during the useful life of the coil. Normally, good routine maintenance reduces the need
for supplementary maintenance.
9.4.3
Microchannel coils
Micro-channel tube & fin coils tend to accumulate dirt more on the outside and less on the inside, and are, therefore, easier to clean.
As a minimum requirement, the coils must be inspected and cleaned on an quarterly basis after initial commissioning. The frequency
of inspections should be increased in the case of aggressive weather conditions or a high degree of dirt. Follow the instructions below
on how to clean the coils properly:
•
Remove all traces of dirt on the surface. Remove any deposits like leaves, fibres, etc. using a vacuum cleaner (or,
if necessary, a brush or other soft accessory, making sure not to scratch and damage the metal parts). If using
compressed air, blow this from the inside outwards (the air should flow in the direction opposite that during normal
operation). In this case, too, be careful not to scratch the coil with the hose or nozzle of the compressed air gun.
•
Rinse. Rinse only with water. Do not use chemical substances (including special detergents for finned coils). These
substances can cause corrosion. Rinse preferably from the inside outwards, aiming the jet perpendicularly to the face
of the coil and allowing the water to flow in each passage of the fins until these are perfectly clean. These fins are
sturdier than those of conventional coils but should still be handled with care. Avoid hitting the coil with the hose. It is
advisable to put a thumb on the end of the hose to adjust the pressure of the jet of water, rather than use nozzles that
could knock against the coil and damage it. Gently blow out any residual water at the centre of the fins.
DANGER:
If using a pressure washer, the distance between the same and the coil surface must be
such not to cause damage.
Keep the line between the nozzle and the surface of the coil as much as possible at a
vertical angle.
Cleaning damage, especially when caused by high-pressure cleaners or chemicals, is not
covered by the warranty.
9.4.4
MICROCHANNEL coils with E-COATING treatment
The cleaning procedures below are recommended and should be carried out as part of routine maintenance for e-coated coils. A
record of all routine cleaning of the coils must be kept in accordance with the terms and conditions of the guarantee provided by the
supplier of the e-coating treatment.
•
Remove all traces of dirt on the surface. Remove any deposits like leaves, fibres, etc. using a vacuum cleaner (or, if necessary,
a brush or other soft accessory, making sure not to scratch and damage the metal parts). If using compressed air, blow this from
the inside outwards (the air should flow in the direction opposite that during normal operation). In this case, too, be careful not to
scratch the coil with the hose or nozzle of the compressed air gun.
•
Routine cleaning. In coastal or industrial areas, the coil must be rinsed on a monthly basis using just water to remove chlorides,
dirt and debris. It is important to use water at a temperature below 45°C and at a pressure below 40 bar to reduce surface tension
and thereby facilitate the removal of dirt and chlorides without damaging the coil. Do not use chemical substances (including
special detergents for finned coils). These substances can cause corrosion. Rinse preferably from the inside outwards, aiming
the jet perpendicularly to the face of the coil and allowing the water to flow in each passage of the fins until these are perfectly
clean. These fins are sturdier than those of conventional coils but should still be handled with care. Avoid hitting the coil with the
hose. It is advisable to put a thumb on the end of the hose to adjust the pressure of the jet of water, rather than use nozzles that
could knock against the coil and damage it. Gently blow out any residual water at the centre of the fins.
•
Quarterly cleaning. Quarterly cleaning is required under the terms of the guarantee and can extend the useful life of the e-
coated coil. Failure to perform quarterly cleaning renders the guarantee null and void and can reduce the performance and life-
span of the coil. Follow the instructions below on routine quarterly cleaning:
o
Clean the coil using the approved type of detergent (refer to the list of approved products further on);
Then use the approved chloride removal product (CHLOR * RID DTS ™). This treatment will remove soluble salts and
o
revitalise the machine. This product must be applied directly on the salts in order for it to be effective. The salts may be
under a layer of grease or dirt. It is essential, therefore, to clean the surfaces thoroughly with detergent before applying
the product. Apply a sufficient amount of CHLOR * RID DTS ™ in a uniform manner all over the surface of the coil.
Make sure to coat the surface thoroughly without leaving any gaps. The product can be applied using a spray pump or
a standard spray gun. When the surface has been completely wetted, the salts are made soluble. Lastly, rinse the
surface with water as instructed in the section "b. routine cleaning". The following detergent has been approved for use
on e-coated coils to remove mould, dust, soot, traces of grease, fluff and other particles, providing that it is used in
compliance with the manufacturer's instructions on mixing and cleaning.
Installation, use and maintenance manual
46
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