The Pentair 520818 Serial COM Port Expansion Module is a replacement automation interface component designed for compatible Pentair IntelliTouch and EasyTouch pool and spa control systems. This module expands available communication connections within the control panel, helping support additional accessory integration and more flexible system configuration during installation, upgrade, or repair.

Key Features

• Serial COM port expansion module is designed for use with compatible Pentair IntelliTouch and EasyTouch automation control systems.
• This component expands available communication connections to support additional compatible accessories and connected equipment.
• Module design helps increase system flexibility in installations that require more communication ports than the base panel provides.
• Common compatible accessory types include indoor control panels, wireless control interfaces, ScreenLogic protocol adapters, and other communication-based automation devices.
• Additional two-pin communication terminals support compatible IntelliFlo pump connection requirements in supported system layouts.
• Intended for maintenance, replacement, or system expansion when an existing automation panel requires more communication capacity.
• OEM replacement design helps maintain fit and function within the original Pentair automation enclosure and low-voltage control area.
• Kit configuration is commonly associated with a 1 foot cable and mounting hardware for installation in compatible panels.

Product Overview

The Pentair 520818 Serial COM Port Expansion Module is an automation expansion component used with compatible IntelliTouch and EasyTouch control systems when additional communication connections are needed. Its primary role is to increase the number of available ports inside the automation panel so more accessories and supported equipment can be integrated into the system without replacing the main controller. This makes it especially useful in more advanced pool and spa setups where multiple connected devices must communicate with the automation system at the same time.

This module is well suited for upgrade, repair, or expansion situations where the main automation enclosure remains serviceable but available communication ports are limited. By adding more connection points for compatible accessories and pump communication wiring, it helps extend the functionality of the automation platform while keeping the installation organized within the low-voltage compartment. For pool owners and service professionals maintaining compatible Pentair automation systems, the 520818 fills an important role in expanding communication capacity and supporting more flexible system control.