Coil Cleaning - Kelvion TEC1 Installation & Maintenance

COIL CLEANING

HEALTH & SAFETY
Kelvion expect that all personnel involved with working on our equipment will be part of a supervised and experienced team. It is expected that all work will be
carried out in accordance with the relevant health and safety directives, the health and safety and any local requirements dictated by the place of installation. It is
expected that this document is used in conjunction with the method statement and risk assessment for any work to be carried out.
CLEANABLE COOLERS
Cleanable coolers are provided with access points to enable cleaning. The design of the coolers is such to reduce the places where dirt and bacteria could
collect. The cleaning can be performed by either wiping or by low pressure water washing (water at between 45 psi). When using any type of cleaning agent it is
vital that the correct dilution ratio is used, the cleaning agent is suitable for the material and that cooler is finally rinsed down with fresh clean water to reduce the
residual pH levels. Generally cleaning agents can have a pH in the order of 12, this must be reduced to as close to pH 7 as is practical after cleaning. This includes
removing any over spray from return bends and surfaces that may not have been directly washed (especially fans, although avoid direct water pressure washing
of the fan motors as this may penetrate the motor drain holes). Any surface left with traces of high pH fluid will start corroding (including Stainless Steel!).
We cannot recommend a specific cleaning regime or period of cleaning, this is to be decided by the hygiene management of the end user and to be appropriate
to the type of product in the room. The most important issue apart from the reduction of bacteria within the casing is to reduce the corrosion potential, cleaning is
the only way of keeping corrosion at a minimum. For extremely corrosive environments, cleaning at the end of every shift on both sides of the coil is recommend-
ed.
Washing off corrosive substances with a final fresh water rinse is the only real defense against corrosion. All materials used in evaporators are exposed to a moist
air stream containing corrosive chemicals, even stainless steel will be corroded if not cleaned and washed down.
COOLER CLEANING CHECK LIST:
1. A cleaning procedure has been determined and the compatibility of the cooler materials and the cleaning agent's suitability has been verified.
2. The working environment is safe, all personnel are trained in the cleaning procedure and there is safe access to the evaporator.
3. Electrical supply to the cooler is isolated and locked off.
4. The chemicals are applied in the correct manner and with the required level of dilution.
5. After the cooler surface has been washed with the cleaning agent then all residual traces must be rinsed off with fresh water and the pH level is back to pH 7.
6. Ensure the inner less visible areas of the coil are given as much attention as the more visible areas.
7. Visually check for signs of corrosion inside and outside the cooler casing. Report any signs of corrosion to the engineering manager. Washing off of
corrosive substances with a final fresh water rinse is the only real defence against corrosion. All materials used in evaporators are exposed to a moist air
stream containing corrosive chemicals, even stainless steel will be corroded if not cleaned and washed down.
45 psi max
After Cleaning pH7