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78 Outside Unit
Test Run
Daily check/management
Maintenance/Repair checklist
1. Water quality control
The plate type heat exchanger is not structured to be disassembled, cleaned or replaced with parts.
To prevent corrosion or scaling on the plate type heat exchanger, special care must be taken to control the water quality.
Water quality must satisfy the minimum criteria of the reference water quality items.
When anti-corrosion agent or corrosion inhibitor is added, the substance must not have any corrosive effect on stainless
steel and copper.
Even if the circulating water is not contaminated by the external air, it is recommended to empty the water flowing in the
pipe and to resupply the water.
2. Flow rate control
If the flow rate is insufficient, it can cause freezing on the plate type heat exchanger.
Check whether the strainer is clogged or whether the pipe is filled with air and then check the temperature and pressure
difference of the inlet and outlet pipe to check whether the flow rate is insufficient.
If the temperature and pressure difference is above the appropriate level, it means that the flow rate is reduced. In this
case, the operation must immediately be stopped and re-operated when the root cause is resolved. (*If air is trapped in
the pipe, the air must be purged. Air inside the water pipe interferes with the circulation of the heat water supply and can
cause insufficient flow rate or freezing.)
3. Brine density management
When using the brine (Anti-freeze) in the heat water supply, designated type and density must be used. Calcium chloride
brine can cause corrosion on the plate type heat exchanger and must not be used.
If the anti-freeze liquid is left as is, it absorbs the moisture from the air to cause a drop in the density, leading to freezing
of plate type heat exchanger. Therefore minimize the contact surface with the atmosphere and periodically measure the
density of the brine to supplement the brine as needed to maintain the density.
• The above checklist is set based on the minimum period and more frequent checking can be required depending on the operating condition/water quality condition.
• When cleaning the heat exchanger, make sure to take parts out or lock the value so that chemical detergent does not penetrate into the pressure gauge etc.
• When cleaning the heat exchanger, check the connecting part of the water pipes prior to cleaning so that the chemical detergent does not leak.
• After sufficiently mixing the chemical detergent with water, start cleaning.
• Cleaning the heat exchanger is easier at the initial stage and becomes difficult after the scaling has accumulated.
• In areas where the water quality is poor, cleaning is required periodically.
Because chemical detergent has strong acidity, it must be washed off thoroughly with water.
• To check whether it is cleaned well inside, remove the hose and check the inside.
• Purge the air to remove any air inside the water pipe.
• After checking, always check whether the heat water supply is flowing normally flowing before operating the product.
(
●
: Check mark)
Product operating condition
Heat exchanger cleaning (Wash)
Strainer cleaning
Water quality check
Refrigerant leakage check
Indoor unit filter cleaning
Period (Year)
Checkpoint
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
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