Hitachi SAMURAI CLG2, Manual, Page: 69 / 118

Maintenance
Technical Catalogue
11
69
TCGB0051 rev 0 - 09/2009

CAUTION:
- Correctly select cleaning agent depending on scales in the plate type heat exchangers. The cleaning chemicals are different
depending on fouling degree.
- This plate type heat exchanger is made of stainless steel. Do not use a cleaning agent containing hydrochloric acid or fluorine
compound. If used, the heat exchanger will be damaged, resulting in refrigerant leakage.
- After cleaning with cleaning agent, clean inside of water piping including the heat exchangers by using clean water. Perform
water treatment (preventive treatment) in order to prevent the water circuit from corrosion or re-adhering of scales after
cleaning.
- In the case that a cleaning agent is used adjust concentration of the cleaning Agent, cleaning period and temperature
according to the scale degree.
- In the case that acid cleaning is performed, neutralisation treatment is required after cleaning. Treatment for neutralisation
fluid should be performed by a waste fluid contractors.
- The cleaning agent and neutralizing agent are erosive and stimulative against eyes, skin, mucous membrane etc. Therefore
use protection tools (protection glasses, protection gloves, protection shoes, protection cloth, protection mask, etc.) in order
not to absorb or touch these agents during this cleaning work
11.4. Cleaning method
1
2
6
4
3
4
5
8
7
N° Name N° Name
1 Chiller Unit 5 Diluted Cleaning Fluid
2 Chilled Water / Inlet Piping 6 Chilled Water / Outlet Piping
3 Acid-resistant Type Water Pump 7 Cleaning Water Tank
4 Hose 8 Waste Fluid Tank
1. Installation of Cleaning Circuit
- Stop the water Chiller unit.
- Stop the circulating water pump.
- Disconnect the connections at the chilled water inlet or cooling water inlet and install a circulating water
circuit by using an acid-resistant type water pump.
2. Check of Circulating Circuit
Pour water in the cleaning tank and operate the acid-resistant type water pump.
- Check to ensure that no water leakage exists.
- Check to ensure that the water hose is firmly fixed.
- Check to ensure that the cleaning Agent will not damage equipment near the water Chiller even if bubbles
occur and touch them.
- Check to ensure that good ventilation is available.
- Check to ensure that no abnormal sound occurs
3. Cleaning Work
- Discharge water in the water circuit of the air conditioning system.
- Supply diluted cleaning fluid from the cleaning water tank by operating the acid-resistant pump.
- Circulate the cleaning fluid for an appropriate period of time (the operating time should be determined
according to the type of cleaning Agent, concentration and fouling degree).