Test Run; Maintenance Of Plate Type Heat Exchanger - LG ARWB200LAS4 Installation Manual

TEST RUN

Precaution before test run
Check whether the air is completely removed and the water sup-
1
ply is flowing smoothly.
Check whether there is any refrigerant leakage of any disconnected
or loose communication or power wire, or use the electric wiring dia-
2
gram to check the wiring connection condition. Check whether the
power and communication wire are connected.
Check whether the power cable R, S, T and N are correctly con-
nected. Check the insulation resistance with the DB mega tester
device (DC 500V) between the power terminal block and grounding,
and check whether it is 2.0MΩ or above when measured.
If the resistance is 2.0MΩ or less, do not operate the product.
Precaution)
- Never check the insulation resistance for the terminal control
board. (The control board can be damaged.)
3
- If you leave the system turned off right after the installation or for
a long period of time, the refrigerant gets accumulated within the
compressor and the insulation resistance reduces to less than 2
MΩ. When the insulation resistance is 2 MΩ or less, turn on the
power and let the electricity be supplied to the crank case heater
of the compressor and let the refrigerant including the oil inside
the compressor to evaporate. Then the insulation resistance value
will increase to more than 2.0 MΩ.
4 Check whether the liquid and gas pipes are open.
Precaution when blocking the water cooling type Multi V main power
- While using the product (Air conditioning season/Heating season), al-
ways connect the main power of the outside unit.
- During the test run operation after installing the product or during the oper-
ation after blocking the outside unit main power (Power outage etc.), you
5
must always connect the power 6 hours prior to heating the crank case
heater. If the crank case is not preheated for more than 6 hours with the
electric heater, it can cause a burn on the compressor.
(Heating the bottom part of the compressor with the crank case heater is
to evaporate the refrigerant included in the oil inside the compressor.)
Water supply system test run
Before executing the test run for the product, you must first test the
heat source water system.
The test run for the product must be executed after checking the flow
rate and temperature of the heat source water supplied.
Design the system including cooling tower, boiler, pump etc.
Equipment design
- Check the equipment capacity (Water volume, temperature
control range).
Water pipe system
Install the water pipe
installation
Water supply pipe
Connect the water pipe to the inlet/outlet of the product so
and product connection that the water can be supplied to the product.
Water supply
Execute water supply system test run
system test run
- The product does not operate but the pump and water
supply equipment will operate to flow the Heat source
water to the heat exchanger on the product side.
- Flow the water to all water piping system to clean any alien
particles inside the pipes and execute an air purge to
remove an air within the pipes to make the water supply
smoother.
- Clean all the strainers of water pipe including around
outside units.
Judging whether there
Execute the test of water supply system without operating
is any problem with
the product.
the water supply
- Check whether outside unit inlet/outlet flow rate complies
to the product specification. Standard Water volume is
96LPM based on 10HP and 192LPM based on 20HP.
- Check the water supply temperature. whether is OK
Execute the
After checking the normal condition of the water supply,
product test run
execute the test run of the product.
To prevent the freezing of the heat exchanger when the
refrigerant is discharged with the water supply blocked,
discharge the refrigerant after draining out around the
outside unit.
! 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.)
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