Samsung AM***MXWA Series - Maintenance; Plate Heat Exchanger Maintenance

ENGLISH-101
03 OTHERS
Maintenance
Precautions on plate type heat exchanger maintenance
 Make sure to tell the user to keep this installation manual.
1. When the product was not operated for long period of time, check the followings:
- Check the water to see if the water quality is meets the standard.
- Clean the strainer.
- Check to see if there is enough amount of water ow
- Check to see if there is any problems on the water pressure, amount of water and the water temperature at inlet/outlet.
- If you are using ground heat source, make sure to check the concentration level of the anti-freeze before the operation
to maintain the freezing point at below -8 °C (Refer to 'Ground heat exchanger circulation water (anti-freeze) usage
standard (mandatory checklist)' on page 105)
2. It is not possible to disassemble the plate heat exchanger for cleaning or part replacement. Therefore it has to be cleaned
by following methods.
- Check if there is any cleaning hole for chemical cleaning at the inlet water pipe. For water scale cleaning use diluted
(down to 5%) citric acid, oxalic acid, acetic acid, phosphoric acid. However, do not use a cleaning solution containing
hydrochloric acid, sulfuric acid or nitric acid since they are highly corrosive.
- Check if there is valve on the inlet/outlet of the plate type heat exchanger.
- Connect a exclusive pipe for cleaning to the inlet/outlet pipe of the plate type heat exchanger and ll the detergent
at the temperature of 50~60˚C and circulate the detergent for about 2~5 hours. Cleaning time can be dierent
depending on the temperature of detergent or degree of water scale. Judge the degree of water scale removal by the
color of water detergent.
- After cleaning, discharge the detergent within the plate type heat exchanger and ll the plate type heat exchanger
with a water mixed with 1~2% of sodium hydroxide or sodium bicarbonate. Circulate the water mixture for 15~20
minutes to neutralize.
- After neutralizing the pipes, rinse the plate type heat exchanger with distilled water.
- If you are using the detergent sold at local retail stores, make sure that it doesn't cause any corrosion to the stainless
steel or copper.
- For detail information on cleaning method (and proper use of detergent), contact the detergent manufacturer.
3. After cleaning, check to see if it is possible to operate normally.