Carrier SOPRANO 50 Operating Instructions Manual page 27

4.3 LOW PRESSURE CLEANING – MODERATELY SOILED COILS
Turn off the entire unit, and secure the unit against unintentional power-on.
Comply with the site's specific safety instructions.
Cleaning with a water pressure washer
For moderately soiled heat exchangers: wet or oily dust, residues with little clogging,... it is possible to use a pressure washer.
- Choose a nozzle to obtain a flat jet (25°)
- Before proceeding on the heat exchangers, it is recommended to activate the hose outside of the heat exchangers, then start the cleaning
at a distance greater than the minimum distance allowed. Use a pressure washer with a maximum pressure of 110 bar. Minimum distance to
keep between the hose and the exchanger = 400 mm
- Orient the flat jet facing the fins and perpendicularly to the heat exchanger. An angled position will cause the fins to fold. A parallel
position will have the effect of spreading the fins.
- Make sure not to orient the jet towards the fans, it is mandatory to protect the fans against splashing water.
- Repeat this operation as necessary until you obtain a perfectly clean surface.
- When using cleaning agents other than water, choose a neutral pH fluid (pH = 7), and rinse with clean water. Be sure that:
these cleaning agents are compatible with all the elements of the exchanger and are not likely to corrode materials
o
used for the manufacturing of the exchanger
these cleaning agents used have no impact on the environment, either by using non-aggressive products or by collecting
o
and treating the effluents resulting from the cleaning of the batteries
4.4 HEAT EXCHANGERS WITH BLYGOLD® COATING
Turn off the entire unit, and secure the unit against unintentional power-on.
Comply with the site's specific safety instructions.
For maintenance on heat exchangers coated with Blygold® treatment, please refer to Blygold® COIL CLEAN procedure attached below.
It is an obligation to respect the distance and water pressure indicated in previous chapter (110bars maximum @ 400mm minimum) as well as
the spraying instructions described in chapter 4.3 HIGH PRESSURE CLEANING – MODERATELY SOILED COILS.
400
mm