Water Pipe System / Piping - LG ACHH017VBAB Installation And Owner's Manual

Air-cooled inverter scroll heat pump chiller

Table of Contents

Water pipe system installation is an important part of the chiller system. Any defect in the water pipe system can lead to chiller malfunction.

When designing the water pipe system, consider future service and maintenance, and install the field-supplied water pipe system compo-

nents as detailed below.

Water Pipe System

Water circulation that has temperature difference of 4°F to 20°F between the outlet water temperature of the hot and cold water is required. If the

water circulation temperature differential is insufficient or is too much, the chiller will malfunction, will not be able to operate properly, and product life

will be reduced.

• Ensure that all installed components comply with the design water pressure (or higher).

• Ensure that the water circulation complies with product specifications. Even when the water circulation complies with the product specifica-

tion, install a bypass circuit on the load side of the water piping system. If water flow is reduced during a low load, it can cause issues such

as excessive and frequent compressor operation, and frozen components during cooling operation or if the operation stops.

• Maintain a constant water circulation flow as much as possible.

Expansion Tank

Expansion tanks receive and expel the excess water, and simultaneously remove air in the water pipe system. Choose an expansion tank with

a capacity from 2 to 2-1/2 times of the water expansion amount. Generally, the expansion tank capacity is 3% to 5% of the entire water pipe

system capacity. Check with local, state, and federal guidelines regarding expansion tank requirements and size. The ACHH Series Chiller does

not have a minimum loop requirement. For applications that require a critical and stable loop temperature the design engineer should design the

loop capacity. A common minimum loop design is 2 times the GPM of a 10 degree delta or standard rated GPM for the system.

Pipe Slope and Air Vent Valve

If air remains in the water pipes, water pipe system resistance increases, and / or the amount of circulating water is reduced significantly.

If air remains in the pump during operation, it can result in chiller malfunction or shutdown. Install an air vent valve where there could be a

chance of air remaining in the water pipe system. Include 1/200 of slope on the air vent valve side to reduce the likelihood of air remaining in

the pipe.

Water Piping

• Install the water pipe system so that the connections to the chiller are correct, tight, and without leaks.

• Permitted water pressure resistance of the water pipe system is 145 psi.

• Add insulation to the water system pipes to prevent any external heat loss, or to prevent condensate from forming during cooling operation.

Follow local, state, and federal guidelines on insulation.

• Add pressure gauges and thermometers on the water inlets and outlets to check chiller operation.

• Include a strainer with minimum 50 mesh on the water inlet to filter particles that could enter the heat exchanger. Install the strainer on a

horizontal pipe.

• Before supplying water, clean inside the pipe system to remove particles that will damage the chiller.

If sand, debris, or rust are present in the water pipe system, these materials can corrode metallic parts and cause chiller operation failure.

• Install the on / off valve on the cold water inlet / outlet and bypass pipe on the pipe direction on the device side.

• Install a pipe system bypass on the initial segment of the chiller water pipe system. A bypass circuit can help when cleaning the pipes before

chiller installation, and during annual water pipe system cleaning.

• On / off valves can prevent water from backflowing into chillers that are not operating; also reduce power to the pump(s). Review site require-

ments for on / off valve installation.

• Include flexible joints at the inlet / outlet pipes that reduce any vibration imparted to the water pipe system and chiller. Flexible joints help

prevent water leaks caused by operation vibration.