Maintenance Of Plate Type Heat Exchanger - LG ARWN Serie Manual De Instalación

Test Run
Item Phenomenon
Heat water not supplied or flow
CH34
rate is insufficient
Whether
heat water
Heat water not supplied or flow
is supplied
CH180 rate is insufficient (During heat-
ing)
h When CH24 or CH180 error occurs during the test operation of the heater, the inside of the panel heat exchanger may be
partially frozen and therefore, be sure to get rid of its cause and then, re-operate the device.
(The root cause of partial freezing: The lack of flow of heat-sourced water, suspension of water, lack of cooling medium,
infiltration of foreign substance inside of panel heat exchanger )

Maintenance of plate type heat exchanger

As the scales are created in the panel heat exchanger, its efficiency may decrease or damage may occur due to winter-sowing due
to the decrease in its flow.
Due to this reason, regular maintenance is necessary so that the scales shouldn't be created.
1. Before the season of use, check below points.(Once a year)
1) inspection on water quality to check if this is within the standard condition.
2) Clean the strainer.
3) Check if the flow is appropriate.
4) Check if the operation environment is appropriate.(Pressure, flow, output temperature)
2. Below procedure should be abided by in order to clean the panel heat exchanger. (Once every 5 years)
1) Check if the service port is equipped with the water pipe in order to clean the chemical solution.
5% diluted formic acid, citric acid, oxalic acid, acetate acid, phosphoric acid and etc. are appropriate for the chemical solution
for wiping out the scales.(Hydrochloric acid, sulphuric acid, nitric acid and etc. shouldn't be used due to its corrosion.)
2) Be sure to check if the gate valve of inflow/outflow pipe and the valve for outflow pipe are properly closed when cleaning.
3) Connect the water pipe for cleaning with the chemical solvent through the service plug of the pipe and fill up the panel heat
exchanger with 50°C~60°C(122°F~140°F) of cleaning solvent and circulate it with the pump for 2~5 hours. The circulation
time may depend on the temperature of the cleaning solvent or the creation of the scales. Therefore, observe change in the
color of the chemical solvent to set the circulation time for removing the scales.
4) After the circulation of the solvent, extract the solvent inside of the panel heat exchanger and fill up 1~2% of NaOH or NaHCO
and then, circulate it for 15~20 minutes to neutralize the heat exchanger.
5) Once the neutralization is completed, clean the inside of the panel heat exchanger with clean water.
Measure the water Ph to check if the chemical solvent is properly removed or not.
6) When using a different kind of chemical solvent in the market, be sure to check if there is any corrosive action to stainless or
copper in advance or not.
7) For details on the cleaning chemical solvent, be sure to consult the specialists of the related corporation.
3. After cleaning, operate the device to see if it works properly once again.
Gate valve(locked)
66 Outside Unit
Cause
Gate valve(locked)
Service plug
Strainer
Outflow water
valve(locked)
[Cleaning the panel heat exchanger]
Check whether heat source water supply pump is operating.
Check whether the heat source water supply pipe is clogged.
(Clean strainer, valve locked, valve issue, air trapped etc.)
Check whether heat source waterr supply pump is operating.
Check whether the heat source watersupply pipe is clogged.
(Clean strainer, valve locked, valve issue, air trapped etc.)
Water-cooling
type multi V
Pump
Checkpoint and resolution
Hose
Screening net
3