Maintenance Of Plate Type Heat Exchanger - LG Multi V Water IV ARWN080LAS4 Manual De Instalación

30
! WARNING
• Always check whether the water supply is flowing smoothly
before the test run. (If sufficient amount of water is not flow-
ing, it can burn the product.)
• During the initial test run after installing the product, leaving
the product for more than 3 days or after replacing the com-
pressor, power must be connected 6 hours prior to the opera-
tion to heat the compressor heater. (If the product is not
heated sufficiently, it can burn the product.)
How to Cope with Abnormal Test Run
Phenom-
Item Cause
enon
When connecting
the flow switch,
heat-sourced
water doesn't
flow or the
CH24
amount of its flow
lacks due to the
checked error re-
lated to heat-
sourced water.
Heat water not
Whether
CH32 supplied or flow
heat
rate is insufficient
water is
supplied
Heat water not
supplied or flow
CH34 rate is insuffi-
cient(During Cool-
ing)
Heat water not
supplied or flow
CH180
rate is insufficient
(During heating)
❈ 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-op-
erate 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, phos-
phoric 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.)
Checkpoint and resolution
Check whether the 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 the flow switch is nor-
mal condition.
(Flow switch problem, arbitrary con-
trol, disconnection etc.)
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 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 water
supply pump is operating.
Check whether the heat source water
supply pipe is clogged.
(Clean strainer, valve locked, valve
issue, air trapped etc.)
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 ex-
changer with 50°C~60°C 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 NaHCO3
and then, circulate it for 15~20 minutes to neutralize the heat ex-
changer.
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 prop-
erly 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 cop-
per 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) Gate valve(locked)
Service plug
Water-cooling
type multi V
Strainer
Outflow water
valve(locked)
[Cleaning the panel heat exchanger]
Daily check/management
1
Water quality control
The plate type heat exchanger is not structured to be disassem-
bled, 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 circu-
lating water is not contaminated by the external air, it is recom-
mended 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 pres-
sure 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 re-
duced. 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 inter-
feres with the circulation of the heat water supply and can cause in-
sufficient flow rate or freezing.)
3
Brine density management
When using the brine (Anti-freeze) in the heat water supply, desig-
nated 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.
Hose
Screening net
Pump