MicroMetl VFD Setup for Economizer & Power Exhaust Integration

Welcome to MicroMetl Academy, your trusted source for HVAC component installations and technical tutorials. In this video, we walk you step-by-step through how to install, wire, program, and reset a VFD (Variable Frequency Drive) for use in HVAC power exhaust systems.

This guide is a must-watch for contractors, installers, and engineers working with economizers, rooftop units (RTUs), or building management systems (BMS).

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What You’ll Learn in This Video:

Proper power wiring and conduit connection for MicroMetl VFDs

How to wire the VFD to an economizer or BMS controller

Programming the VFD using the onboard keypad

Adjusting pressure setpoints for optimal airflow

Resetting VFD parameters to MicroMetl OEM defaults

Troubleshooting common issues during startup

Variable frequency drives (VFDs) offer precise airflow control for power exhaust fans, helping facilities:

✅ Improve energy efficiency
✅ Optimize indoor air quality (IAQ)
✅ Integrate seamlessly with economizers or BMS
✅ Reduce equipment wear and HVAC runtime
✅ Stay compliant with ventilation codes

Whether you're in commercial construction, facilities management, or HVAC retrofitting, this setup guide saves time, cuts guesswork, and boosts system performance.

Timestamps:

0:00 – What This VFD Setup Video Covers

0:14 – Power Wiring and Safety Guidelines

1:11 – Wiring VFD to an Economizer (Step-by-Step)

2:24 – Programming the MicroMetl VFD

4:45 – Changing Pressure Setpoints

5:48 – Editing VFD Parameters via Group 0

6:02 – Resetting to MicroMetl OEM Settings

7:10 – Final Thoughts & Support Resources

Step-by-Step Breakdown:

Step 1: Connect Power Safely
→ Open the access panel, feed conduit through the knockout, and connect high voltage wiring to the VFD’s power terminal box. Do NOT share power with the RTU unless local code allows.

Step 2: Integrate with Economizer or BMS
→ Use yellow and brown wires from the VFD to connect to the economizer control.
→ If integrating, remove jumper between DI1 and 24V and replace with control relay wires.
→ Skip jumper removal if no economizer is present.

Step 3: Program the VFD
→ Navigate the interface with the arrow keys and Enter.
→ To adjust pressure setpoint, use up/down keys in operating mode (e.g., 50 = 0.05 in. WC).
→ Edit parameters in Group 0 by entering the password prompt.
→ Use P701.05 to reset to OEM defaults — NOT P700.01, which resets to Lens factory settings.

Proper VFD setup ensures maximum performance, compatibility, and energy savings. Whether you’re working with power exhaust systems, economizers, or full BMS integration, this MicroMetl guide will get you up and running fast.

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