LG THERMA V Cascade Control Unit system featuring multiple outdoor heat pump units and a wall-mounted indoor controller.
The LG Cascade Control Unit adjusts the number of AWHP units to match thermal demand. It supports 2 to 8 units and is compatible with the R290 Premium Monobloc and R32 Monobloc 51kW, enabling flexible system design and efficient operation under peak and partial load conditions.
The LG Cascade Control Unit provides a fully integrated installation solution with built-in sensors and Modbus. It also supports easy connection to third-party devices via Modbus. Simplified wiring improves installation efficiency, and only one Cascade Control Unit is required per outdoor unit, with no indoor unit needed.
It supports optimized runtime control, defrost operation, and backup functionality in emergency situations, providing reliable heating performance. 1), 2)
It tracks operating hours and evenly distributes runtime to optimize system performance, reduce load, and maintain stable operation.
Outdoor units perform Defrost Operation sequentially one by one, providing stable operation throughout the system.
When an outdoor unit suddenly encounters an error, other outdoor units perform backup operations to maintain system functionality.
1) If an individual outdoor unit does not receive the permission signal from the cascade control unit within 30 minutes for the R290 Premium Monobloc, or within 15 minutes for the R32 Monobloc 51 kW, it will initiate forced defrost operation.
2) Considering the case that Cascade Control Unit itself has an error, an emergency operation function would be provided in which the outdoor units operate independently.
LG Cascade Control enables remote system management via LG BECON cloud for remote configuration and allows monitoring of all connected outdoor units through LGMV.
Image of a man monitoring and controlling R290 Monoblocs via BECON.
* LG BECON cloud is only available for the R290 Premium Monobloc models and cannot be used with the R32 Monobloc 51kW.
LG Cascade Control Unit is available in two models, each designed to connect with either the R290 Premium Monobloc or the R32 Monobloc 51kW. Choose the type and number of outdoor units that best fit your thermal needs and installation environment, then connect them to the Cascade Control Unit for seamless, integrated control.
Two grey LG heat pump outdoor units placed on a stone patio with a highlighted indoor controller on the wall.
| Features | R290 Premium Monobloc | R290 Monobloc S | R32 Monobloc S II | R32 Monobloc 51kW |
|---|---|---|---|---|
 |  |  |  | |
| For Standard Capacity (PHCM0) | O | X | X | X |
| For Large Capacity (PHCML0) | X | X | X | O |
This image shows Cascade Control Unit installed.
Does the required Cascade Control Unit depend on the model?
The R290 Premium Monobloc is compatible with the PHCM0 Cascade Control Unit, while the R32 51kW Monobloc is compatible with the PHCML0 Cascade Control Unit. Remote control features may vary depending on the product.
Is it possible to configure a Cascade System with different outdoor unit capacities?
All outdoor units connected to the Cascade Control Unit must be configured with models of the same capacity. When selecting units, please check the capacity of each product and consider your thermal needs and installation environment.
What is the maximum outlet water temperature?
Outlet water temperature conditions vary by product.
(1) R290 Premium Monobloc
The maximum outlet water temperature of LG R290 Monobloc is 75℃, and the inlet water temperature at this time is 65℃. (ΔT is 10℃) In case of the LG R290 Monobloc, if it is set to 75℃, the flow rate is reduced by half, and it doubles ΔT compared to the general ΔT of 5℃. However, in a cascade system, since it is not easy to control the flow rate of each unit, the flow rate is always fixed and operated based on ΔT of 5℃, and accordingly, the maximum outlet temperature is limited to 70℃.
(2) R32 Monobloc 51kW
The R32 Monobloc 51 kW supports an outlet water temperature up to 60°C in cascade operation, which is the same as for a single unit. This is because, unlike the R290 Monobloc, it does not achieve higher leaving water temperatures by reducing the flow rate and increasing ΔT. If a backup heater is installed, the leaving water temperature can be increased up to 65°C.
If some products are set to heating and the rest are set to hot water, is it possible to operate heating and hot water at the same time?
Although some units are designated for heating and remaining units are designated for hot water, their simultaneous operation of heating and hot water by heat pump cycle is currently impossible. Therefore, we recommend configuring two Cascade Systems by separating the heating and hot water systems.
Should LGMV monitoring be performed on individual units?
LGMV can be connected directly to a cascade control unit rather than to individual outdoor units, providing a monitoring function for all connected outdoor units.
What is LG BECON cloud, and is it compatible with all Cascade control units?
LG BECON cloud is a cloud-based platform that provides comprehensive maintenance services for HVAC products. Through real-time monitoring, it enables rapid dispatch support, efficient facility management, and energy management. This allows users to respond quickly to issues and manage systems easily and conveniently.
BECON cloud availability varies depending on the product.
(1) R290 Premium Monobloc & PHCM0 Cascade control unit
- BECON cloud is supported.
(2) R32 Monobloc 51kW & PHCML0 Cascade control unit
- BECON cloud is not supported.
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