ENGLISH-116
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 flow
- 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 (17.6 °F) (Refer to 'Ground heat exchanger circulation water (anti-freeze)
usage standard (mandatory checklist)' on page 122 ~ 125)
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 fill the detergent
at the temperature of 50 ~ 60 ˚C (122 ~ 140 °F) and circulate the detergent for about 2~5 hours. Cleaning time can be
different 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 fill 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.
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