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Pipe Insulation
Water pipe insulation is suggested in the following conditions:
• Where water pipe is subject to freezing.
• Water pipe where water can condense on surface of pipe from ambient room temperatures higher than temperature of water in the pipe. If
water temperature is maintained at 68°F in winter and 86°F in summer, insulation will not be required.
• On boiler water pipes to save energy losses from heat source.
• On condensate drain lines.
• Where required by local code.
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 temperature 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 / Differential Pressure Switch
• A flow switch is a required installation component on the water pipes connected to the water-source unit.
• Flow switch must be rated for 208-230V and must be a normally open (closed on increase of flow) type. (Flow switch will perform as the
first protection device when heated water is not supplied. If the required water level is not present 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: 4.4-ton - 15.9 gpm.) When the Variable Water Flow Control kit is also installed, set
the flow switch minimum flow rate to 40% of the nominal flow rate instead of 50%.
• Select a flow switch following the pressure specification of the water supply system.
• 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.)
WATER CIRCUIT INSTALLATION
Figure 21: Potential Heat Exchanger Damage.
1. Scale and mineral deposits
Heat Source
(Water)
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. "LG" is a registered trademark of LG Corp.
Piping System Specifications
2. Partially frozen
Refrigerant
3. Damage
(cross contamination)
WATER CIRCUIT | 47
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