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SM-18006
TROUBLESHOOTING
3.4.1 Test Run for Water Piping
Before Test Run, make sure that the water piping work has been carried out in a proper manner.
Especially, make sure that the water strainer, automatic air discharge valve and water ow switch are
positioned at their correct places.
(1) Close the gate valves to cut off water ow to the water source unit and circulate water within the
common water piping.
After removing any foreign particles and substances from the water piping, clean the water strainer
near the water inlet side of water source unit.
For better cleaning of the water strainer, provide short-circuit by using the exible connection to
circulate water to the point just before the water source unit.
(2) Open the gate valves to circulate water to the water source unit.
Be sure that no air has been caught in the water system.
(3) Measure the water pressure drop of before and after the water source unit and make sure the water
ow rate is according to design.
Be sure that entering water temperature is within the operation range and then perform Test Run.
Check the entering water temperature is within the operation range during Test Run.
If any air has been caught or the water ow rate is not enough in the water piping the plate heat
exchanger may freeze.
In case of any abnormality, stop the test run immediately and carry out troubleshooting and resolve the
trouble.
(4) When the water ow switch is installed incorrectly, “A2” alarm occurs.
Check the contact signal is closed when the water pump is operating.
(5) When the water ow switch is selected incorrectly, “0d” alarm occurs.
Check the water ow switch does not operate when the water ow rate drop below minimum.
(6) Proper inspection should be performed to check for water leaking parts of water piping.
(7) After the Test Run has been completed, inspect the water strainer at the water inlet side of water
source unit. Remove any foreign particles and substances from the water strainer.
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