How to Install Siemens POL224 HVAC Controller with MicroMetl Products | MicroMetl Installation Guide

Welcome to MicroMetl’s HVAC installation series—the trusted resource for commercial HVAC technicians and installers. In this guide, we walk you through the installation of the Siemens POL224 controller and supporting accessories for a rooftop unit economizer setup.

This video is designed exclusively for certified HVAC technicians, ensuring safety and technical accuracy when working with high-voltage rooftop units.

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📚 What You’ll Learn in This Video:
How to identify and use Siemens HVAC control components

Step-by-step wiring of the PL6 plug, sensors, and harness

Mounting and connecting mixed air and outside air sensors

Controller startup, menu navigation, and programming overview

Final installation and support options

Using the Siemens POL224 controller enables efficient control of rooftop economizers, optimizing air intake, energy use, and indoor air quality. This method is:

✅ Scalable across industries (retail, education, manufacturing, office buildings)
✅ Efficient and code-compliant
✅ Designed to reduce manual errors with intuitive wiring and setup
✅ Easily integrated into standard rooftop unit control systems

⏱️ Timestamps:
0:00 – Introduction & Safety Disclaimer
0:44 – Parts Bag Overview
1:01 –Locating & Removing the 12-Pin Jumper Plug
1:15 – Connect the PL6 Plug & Actuator
1:24 – Installing Sensors (Dry Bulb or Enthalpy Sensors)
2:00 – Mounting the Siemens Controller
2:34 – Wiring to the Control Board
2:57 – Route Sensor Wiring
3:47 – Mixed Air Sensor Mounting & Wiring
4:37 – Power-Up Unit and Controller Menu Navigation
5:06 – Programming the Siemens POL224
5:30 – Final Reinstallation & Support Resources

🛠️ Step-by-Step Breakdown:
Step 1: Identify and Prepare Components

Locate controller, wiring harness, sensors, and 12-pin jumper

Confirm whether you’ll use a dry bulb (9901-1619) or enthalpy sensor (9901-3535)

Step 2: Install Controller and Sensors

Connect PL6 plug to actuator

Mount the chosen sensor (inside OA damper or on economizer face)

Mount Siemens controller near existing board and unwrap harness

Step 3: Complete Wiring and Configuration

Connect Econ plug from controller to unit port

Route orange, brown, violet, and pink wires into blower section

Wire sensors (pink/violet to blower bundle, orange/brown to sensor)

Power on unit, navigate menus, and configure Siemens POL224 controller

Return unit to run mode and reinstall access panels

Installing the Siemens HVAC controller with proper wiring ensures safe, efficient rooftop unit operation. Whether for retrofits or new builds, this step-by-step guide gives you the clarity needed for successful deployment.

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🌐 Visit www.micrometl.com for manuals and tech support