Device Protection Unit - LG MULTI V ARWN80LA2 Product Data

6. Device protection unit

6.1 Strainer on water pipe
To protect the water cooling type product, you must install a strainer with 50 mesh or more on the heat water supply pipe.
If not installed, it can result in damage of heat exchanger by the following situation.
1. Heat water supply within the plate type heat exchanger is composed of multiple small paths.
2. If you do not use a strainer with 50 mesh or more, alien particles can partially block the water paths.
3. When running the heater, the plate type heat exchanger plays the role of the evaporator, and at this time, the temperature of
the coolant side drops to drop the temperature of the heat water supply, which can result in icing point in the water paths.
4. And as the heating process progresses, the water paths can be partially frozen to lead to damage in plate type heat
exchanger.
5. As a result of the damage of the heat exchanger from the freezing, the coolant side and the heat water source side will be
mixed to make the product unusable.
1. Pollution of
Heat source
Heat Source
Water
6.2 Flow switch work
• It is recommended to install the flow switch to the water collection pipe system
connecting to the outside unit.
(Flow switch acts as the 1st protection device when the heat water is not supplied.
If a certain level of water does not flow after installing the flow switch, an error sign
of CH24 error will be displayed on the product and the product will stop operating.)
• When setting the flow switch, it is recommended to use the product with default
set value to satisfy the minimum flow rate of this product. (The minimum flow rate
range of this product is 50%. Reference flow rate : 10HP – 96LPM, 20HP –
192LPM
• Select the flow switch with the permitted pressure specification considering the
pressure specification of the heat water supply system. (But, the flow switch must
be for AC250V.)
• 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 product performance deterioration or serious product problem.
• If the product is operated with the heat water supply not flowing smoothly, it can damage the heat exchanger or cause
serious product problems.
• In case of CH24 or CH180 error, there is a possibility that the plate type heat exchanger is partially frozen inside. In this
case resolve the issue of partial freezing and then operate the product again. (Cause of partial freezing : Insufficient
heat water flux, water not supplied, insufficient coolant, alien particle penetrated inside plate type heat exchanger)
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2. Partially frozen
Refrigerant
3. Damage
Cover
Micro-switch
Adjustment screw
Vibration plate
Bellows
1 inch or
3/4 inch
socket
Pad
Installation