Introduction - LG ACHH017VBAB Installation And Owner's Manual

General Information
The LG Inverter Scroll Heat Pump Chiller provides both cold water
and hot water for heating and cooling application. The ACHH Series
Chiller is an air cooled R410A system with a wide range of approved
air side and water side operating conditions. The ACHH is a single
unit product produced in 3 frame sizes; a 20 ton (2-compressors), 40
ton (4 compressors) and 60 ton (6 compressors). This single unit is
designed to be used in a modular concept to provide a much larger
capacity.
The LG HMI (Human Machine Interface) or chiller control is capable
of controlling up to 5 single units as one system. The ACHH Chiller
is engineered by LG with inverter technology in its compressors and
BLDC variable speed condenser fan motors that provide low noise
operation and electronic expansion valves for precise load control.
The ACHH system is designed with a plate type evaporator heat
exchanger connecting to the water side and a fin in tube air cooled
condenser coil design.
The ACHH basis of design is to provide independent refrigerant
circuits per each 10 ton compressor and a shared evaporator on the
water side only for each 20 tons of capacity. The ACHH is provided with LG's unique control logic to monitor and control necessary param-
eters providing improved operational efficiency. The load requirements will change due to flow, set point or ambient conditions and LG's
greatest strength of design is the ability to match this the capacity that is required during operation to exactly what is needed. The LG ACHH
Inverter Scroll Heat Pump Chiller is a commercial/industrial product.
Cooling and Heat Pump Heating Cycle
ACHH LG Inverter Scroll Heat Pump Chillers feature high-pressure shell type scroll compressors. The suction vapor area is separated from
the high-pressure discharge area, and the motor is installed on the low-pressure vapor area. Space for the motor and storage for refrigerant
is secured in the low-pressure vapor area to increase liquid compression reliability.
Because the suction refrigerant vapor cools the motor and flows to the compressor, a separate device to cool the compressor is not required.
Inside the system, oil to lubricate the compressor is mixed with the refrigerant to discharge both the oil and refrigerant during operation.
Because the oil discharged from the compressor can reduce the heat transfer efficiency when a thick layer builds up on interior walls of the
condenser and evaporator, a device to prevent the refrigerant and oil to be discharged together is added to prevent this issue. This lubrica-
tion system ensures longer life for the compressor, improves the sealing of the compression space, and provides lower sound operation.
The heat exchanger is an air-cooled fin and tube type. The condenser is designed with a V-shaped heat exchanger, and an electronic expan-
sion valve is used for efficient control in all load conditions. The controller used in the chiller is an LG exclusive, and monitors the different
sensors installed to provide product protection.
For continuous supply of cold and hot water, LG chillers are equipped with maximum continuous operation functions, and also provide preci-
sion control to supply the accurate targeted water temperature set points in heating and cooling modes.. Protection devices will immediately
stop the chiller if the operation malfunctions, or a condition limit is reached. In case of an operation malfunction, the chiller controller will
display error codes to the authorized LG service provider.
Error codes are available on site by looking at the HMI or available via 3rd party integration as a viewable point. The ACHH has a "Black
Box" that a stores a run file that can be reviewed by the LGMV Service Software for a very detailed look providing key information on what
caused the error.
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.

INTRODUCTION

Figure 1: Example of an LG Chiller.
Fan Motor
Condenser
Cover
Sub-Controller
Box
Main Controller Box
Fin and Tube
Heat Exchanger
Side
Cover
Forklift Access
Lifting Strap
Support Access
9