VRFTools / On your PC

MTPlus

See the whole job from one screen. Then prove every port.

MT+ is a free Windows app that works over the same M-NET USB converter as Maintenance Tool. It draws every system after an address search, checks sensing location in one pass, and turns Port Verification into a quick, recorded job.

  • Completely free, no account needed
  • No internet connection required
  • Built-in demo site to try it out at home

Checking for the latest version…

01 Address search & system map

Every system, drawn the way you think about it.

Run the address search and MT+ draws each system for you: outdoor units, BCs, and the indoor units under the BC port they're piped to.

  • Error codes right on the unit that has them
  • Which units have lost power, at a glance
  • A per-port layout, so you know what's on every BC port
Sped up: the address search finds an error on IC05 and a power outage on IC11 and IC12, and holds that summary at the top while the system maps print below it, OC 51's and then OC 70's. View full size

02 Data collection

Pull the job's data in a few clicks.

Read DIP switch positions, the malfunction log, function settings and more straight from the equipment, without paging through it unit by unit.

  • DIP switch positions
  • Malfunction log (error history)
  • Function settings, and more
  • All saved as .csv files with the job
The DIP switch, malfunction log and function settings reads are clicked, and each one writes its output to MT+'s log. The malfunction log and function settings come from the outdoor units. View full size

03 Sensing location

Catch a sensing problem before the temperature complaint.

See which sensor every indoor unit is controlling to, for the whole job in one pass. It's a quick spot check of the setup on every site, instead of confirming DIP switches and function settings one unit at a time, which usually waits until someone calls about the temperature.

Didn't know sensing location could be set over M-NET? A lot of techs don't. MT+ shows you where it stands.

The sensing location of all 18 indoor units, and whether each was set by SW1-1 or through Maintenance Tool. View full size

04 Port Verification Certified

Port Verification Supercharged

This is the big one. MT+ drives one BC port at a time and shows the indoor units' pipe temperatures react, so you see which unit is really on which port. Recording the actual port is simple, so there's less to get wrong, and it's a massive time saving over doing it by hand.

  1. Start the Test Run with one button

    Press Test Run and the units enter it. Pick another outdoor unit and press it again: multiple systems can be verified at the same time.

    Test Run (Heat) starts OC 51: every indoor unit runs and its TH3 goes hot, red at 100 °F. Then OC 70 is clicked and Test Run (Cool) is pressed for that system. View full size

  2. One click drives a port

    Click a port to drive it, and click an overridden port to release it. The indoor-unit readings refresh every 10–20 seconds, so you watch the temperatures move and tick the actual port.

    On OC 70, an X-Gen system, port 1 on BC 71 is shut. Once IC 20's TH2 climbs past 55 °F (it turns from blue to white), IC 20 is ticked on port 1. Then port 2 is shut, port 1 released, and IC 21 is ticked on port 2 once its TH2 passes 55 °F. View full size

  3. Exit, and the report is done

    Fill in the last actual ports and press Exit. The report marks every unit on every system Pass or Fail and lists the corrective actions, so it's both your corrective-action sheet and startup documentation to record or submit.

    Port 3 on the sub BC (BS 79) is overridden, with every other unit already recorded. IC 31 is ticked on port 3 and Exit is pressed. The report marks all 18 units Pass or Fail (15 pass, 3 fail), then scrolls down to the corrections. View full size

Fewer steps than Maintenance Tool

Starting a Test Run

In Maintenance Tool · 6 steps

  1. Drive Operation → IC
  2. Set Selected addresses
  3. Click on every unit you want to command
  4. Select Test Run and choose the mode
  5. Click Transmit and wait
  6. Close out of the command window

In MT+ · 1 step

  1. Click Test Run Cool or Test Run Heat

Seeing a port respond

In Maintenance Tool · 7 steps

  1. Drive Operation → BC or BS
  2. Change the value of the port's Solenoid or LEV and select Fix. Select Cancel on the previous port.
  3. Click Transmit, then click Monitor to make sure the command took
  4. Close the command window
  5. Wait a minute or more to see a temperature change
  6. Manually record whether the port is correct
  7. Repeat

In MT+ · 4 steps

  1. Click the port you want to operate. Click an overridden port to release it.
  2. Watch the temperature readings change every 10–20 seconds
  3. Record the actual port in MT+
  4. Repeat

Try it yourself

Get Certified on the demo site

The Certified test is the demo. It's a real Port Verification in MT+, on a simulated X-Gen system with some indoor units piped to different ports than their dials say. Find where each one is really piped and Port Verification is yours to use on the job.

  1. Download MT+

    It's free. Install it on any Windows PC.

  2. Start the demo site

    Open MT+ with no converter connected, or while Maintenance Tool is running, and press Start demo site.

  3. Verify the ports

    Open Port Verification and record which port each indoor unit is actually on.

  4. Pass and register

    Press Exit and vrftools.com checks your run. Pass, type your email, press Register, and Port Verification unlocks.

  • Every run is piped differently. Didn't pass? MT+ tells you which units were wrong and why. Close MT+ and open it again to retry.
  • Grading needs an internet connection when you press Exit. Once you're registered, your key is stored on the laptop and works offline.
  • Certified also unlocks Evac Mode.

Coming in the next release · 1.3.1

Site reports, as PDFs

Turn a session's .MTPlus file into a PDF site report, with fillable fields for your startup documentation.

Today, in MT+ 1.3.0: the Port Verification report, with every unit on both systems marked Pass or Fail. The next release adds PDF site reports. View full size

Also in Basic, free for everyone

Models & serials, connected capacity, compressor hours, and setting the outdoor unit's date and time. Every tool saves a CSV to the job's session folder and has a help page with pictures.

What you need

  • A Windows PC
  • The M-NET USB converter you use with Maintenance Tool (PAC-USCMS-MN-1)
  • A connection to the system's M-NET

Questions

Why is my browser blocking the download?

Not because of anything in the file. Browsers and Windows are wary of any program few people have downloaded yet, more so when it isn't code-signed, and MT+ is both new and unsigned.

Code signing is a digital signature on a program, made with a certificate the publisher buys each year from a company that checks who they are. It lets Windows show the publisher's name and trust a new program sooner. It's a yearly cost aimed at software companies, and it isn't practical for a free tool right now.

Keep the download and run it:

  • Chrome: open your downloads (Ctrl+J), find MT+ and choose Keep. Some versions word it Download suspicious file.
  • Edge: in the downloads panel, hover over MT+, open the … menu and choose Keep, then Show more and Keep anyway.
  • Windows: if a blue Windows protected your PC box appears when you run the installer, click More info, then Run anyway.

Only download MT+ from vrftools.com. If a company laptop won't run it at all, that's an IT policy on unsigned programs; your IT department can allow it.

Why are some tools locked?

Most of MT+ only reads from the equipment, and all of that is in Basic, free for everyone with no test. A few tools command units instead of just reading them, and a tool like that, misused on a live system, can cause real trouble. Port Verification and Evac Mode are those tools, so they unlock with Certified.

Certified is free too. You earn it by passing the Port Verification test on MT+'s demo site, so everyone who uses those tools on a real job has run one first.

Why do I need to pass a test?

Only for the Certified tools; everything in Basic works without it. Certified unlocks tools that command the equipment instead of just reading it, such as Port Verification.

The test is the job itself: a Port Verification on MT+'s demo site, a simulated system with some indoor units piped to the wrong ports. Find where each one is really piped and you pass. It's the only way to Certified. See Get Certified for how to start it.

Can MT+ harm the equipment?

The tools that read (the address search, DIP switches, error history, function settings) only ask units for information; they don't change how anything runs. Tools that write settings or command units can, just as Maintenance Tool can. That's why MT+ groups its buttons into Read, Write and Command rows, why the stronger tools sit behind tiers, and why command tools carry their own safety checks whatever your tier: Evac Mode won't run until every indoor unit is detected off.

Like any service tool, it's only as safe as how it's used. Know what a tool does before you run it on a live system; every tool has a help page in MT+. See the Disclaimer & Terms of Use.

Is MT+ really free?

Yes. There's no price, no subscription and no trial that runs out. Certified is free too: the test is about safe use, not payment.

MT+ does ask you to join the VRFTools newsletter when it starts. You can close the prompt after a few seconds, and once you subscribe and confirm the email, it stops asking. VRFTools runs on donations, so if MT+ saves you a trip, a beer helps keep it that way.

Does MT+ need an internet connection?

No. The basics work offline with no account. The Certified test needs a connection when you press Exit, so vrftools.com can check your run; after that your key is stored on the laptop and works offline. When there is a connection, MT+ also checks for updates and sends any feedback you choose to send.

What does MT+ send to vrftools.com?

For the Certified test, your demo-site run (the ports you recorded and the steps you took) and, once you pass, the email you register. Otherwise only your email when you subscribe to the newsletter or MT+ checks whether you have. Feedback carries what you typed, which tool, your tier and the MT+ version, with no email and nothing that names your PC.

More answers in the site FAQ.

MT+ is an independent tool from Madison Innovations. It is not made, endorsed or supported by Mitsubishi Electric. See the Disclaimer & Terms of Use. Found a bug? Report it.