LG - Dry Contact for 3rd Party Thermostat

LG PDRYCB320 Dry Contact for Third-Party Thermostat

The The LG Dry Contact for Thermostat (Model PDRYCB320) is an advanced interface module that allows compatible LG HVAC systems to be controlled by a third-party thermostat or external controller. Supporting On/Off, Mode, Thermostat Call, and Fan Speed inputs, it provides seamless integration with LG Multi V systems, select Duct-Free Split (DFS) indoor units, and LG Air-to-Water Heat Pump (AWHP) Monobloc applications. With built-in Setpoint Tracking Logic and operation/error status outputs, the PDRYCB320 delivers flexible control, improved inverter performance, and simplified system integration.

Key Benefits

• Third-Party Thermostat Integration – Control LG indoor unit operations using standard 24 VAC third-party thermostats or controllers.
• Comprehensive Signal Inputs – Features inputs for Unit On/Off, Thermo On/Off, Mode (Cool, Heat, Fan), and Fan Speed control (Low, Medium, High).
• Universal Input for Setpoint Control – Allows setting a desired temperature setpoint using DC voltage (2.5–8.5 VDC for 64°F to 86°F) or resistance (2.8–8.5 kΩ for 64°F to 86°F).
• Setpoint Tracking Logic – Built-in tracking logic optimizes inverter utilization for maximum efficiency and comfortable temperature control.
• Auxiliary Heat Support (W2 Signal) – Includes a dedicated W2 signal input terminal to trigger and control internal electric heat strips on Vertical Air Handling Units (VAHU models).
• Status Outputs & Monitoring – Provides relay contact outputs for monitoring active Operation state and Error/Fault status.

Technical Specifications & Data

• Power Supply – 12 VDC supplied directly from the connected indoor unit.
• Contact Rating – Rated for up to 3A at 125 VAC.
• Operating Temperature Range – 14°F to 158°F.
• Storage Temperature Range – -4°F to 176°F.
• Operating Humidity – 0% to 98% (non-condensing).
• Unit Dimensions – Compact physical footprint measuring 4-1/8" W x 3-1/16" H x 1-3/8" D.

Warranty Overview

The PDRYCB320 Dry Contact module is covered under LG’s controls limited warranty program. Key terms include:

• Warranty Period: Covered for one (1) year from the date of original installation for V-net controls and related accessories. If the installation date cannot be verified, the warranty period begins sixty (60) days from the manufacture date.
• Coverage: Provides a new or remanufactured replacement product/part or factory credit for malfunctioning items failing due to defects in materials or factory workmanship under normal use.
• Conditions: Must be installed by a licensed HVAC or controls technician in accordance with LG installation instructions, remaining at its original installation site in the United States. Proof of installation date is required when making a claim. Labor costs for diagnosis, removal, shipping, or reinstallation are excluded.