LG Multi V water mini Series Installation Operation & Maintenance page 46

WATER CIRCUIT INSTALLATION
Piping System Specifications
Device Protection Details
Strainer on Water Pipe
To protect the water source unit, a strainer with ≥50 mesh must be
installed on the water source unit inlet piping. If not installed, the
heat exchanger can be damaged by particles in the water supply.
1. The water-supply circuitry within the plate-type heat exchanger
is comprised of many small paths / channels.
2. If a strainer with 50 mesh or more is not included, foreign
particles can partially block the water flow.
3. When the system operates in heating, the plate-type heat
exchanger functions as an evaporator, therefore, the tempera-
ture of the coolant supply drops the temperature of the heat
source water supply, which can result in ice forming in the water circuitry.
4. As heating operation progresses, the channels can be partially frozen, which may damage the plate-type heat exchanger.
5. If the heat exchanger is damaged, the coolant supply and the heat-source water supply will mix, and the system will not function.
Flow switch
• It is recommended to install a flow switch on the water pipes that are connected to the water source
unit.
• Flow switch should be rated for 208-230V and be a normally closed type. (Flow switch will perform as
the first protection device when heated water is not supplied. If the required water level is not pres-
ent after installing the flow switch, the water source unit will display a CH24 error code and will stop
operating.)
• When setting the flow switch, it is recommended to use the default set value of the water source unit to
satisfy the minimum flow rate.
(Minimum flow rate range is 50%; Reference flow rate: 3-ton - 10.6 gpm, 4-ton - 13.2 gpm, 4.4-ton -
15.9 gpm.)
• Select a flow switch following the pressure specification of the water supply system.
Note:
• If the set value does not satisfy the minimum flow rate, or if the set value is changed by the user
arbitrarily, it can result in performance deterioration or system failure.
• If the water source unit operates with a hard water supply, the heat exchanger can be damaged
or system failure can occur.
• If the water source unit displays a CH24 or CH180 error code, it is possible that the interior of the
plate-type heat exchanger is partially frozen. If this occurs, resolve the partial freezing issue and
then operate the water source unit again. (Causes of partial freezing: Insufficient heat water flow
rate, water not supplied, insufficient coolant, foreign particles inside plate-type heat exchanger.)
46
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Figure 47: Potential Heat Exchanger Damage.
1. Scale and mineral deposits
Heat Source Refrigerant
(Water)
3. Damage
2. Partially frozen
(cross contamination)
Figure 48: Flow Switch Schematic.
Cover
Micro-switch
Adjustment screw
Vibration plate
Bellows
1 inch or
3/4 inch
socket
Pad