These FAQs are intended to clarify, explain, and promote better understanding of how the iManifold system and iConnect system operate.

General Questions

What device is the best to use on iManifold?

We recommend using devices that are less than 2 years old to maximize the performance of the iManifold app and Bluetooth connectivity. Both Android and Apple devices work great and the only preference is yours.

Do I need an Internet connection to use the iManifold?

No, not for use. An Internet connection is only required to download the application and to use cloud services or email. The application will work without internet connection.

How much does the iManifold 900M cost?

$799.00 MSRP

What is in the iManifold 900M box?

The iManifold with an attached hook, 6 AA batteries, and two 12 foot Cooper Atkins pipe strap type temperature sensors.

Is the iManifold water resistant?

Yes, it is water resistant, it can be used in light rain, but it cannot be submerged or used in a monsoon.

Is the iManifold vacuum rated?

Yes it is, and it can also read vacuum like a mechanical gauge, but to read microns you need a vacuum gauge (future wireless accessory).

What is expected battery life?

Approximately 40 hours.

Can I use the iManifold to monitor compressor oil pressure?

Yes, the sensor will not be affected by oil, refrigerant, water, or acids.

Can I use the same gauge for multiple refrigerants?


What do I need to do when switching types of refrigerant?

At least vent the residual refrigerant from your hoses, then install and purge the hoses with the refrigerant type that is in the system. While it is not required, you could use two sets of hoses, one for POE oils, and one for mineral oils.

What do I do if my iManifold or probes get wet?

Tools will occasionally get stuck in the rain, but it should be understood that air conditioning systems cannot be service in the rain as it changes the characteristic of the condenser coil making it impossible to accurately check charge or performance.

The iManifold hardware is not waterproof. The iManifold is water resistant with the foam port plug in place and the iManifold hanging vertically from the hanging hook. Probes are not water resistant or water proof. Probe temperature and USB ports are points of water ingress. It is recommended that the probes be shielded from direct spray or rain. If water gets into the probe, as soon as possible place the probes in a sealed container on top of a paper towel with several cups of Damprid (available at Wal-Mart, Home Depot or Lowes) below. Do not place the probes or the iManifold directly in the Damprid desiccant (http://www.damprid.com/). Allow the hardware to sit 12-24 hours to absorb moisture. Do not power up wet probes or damage could occur to electronics. Water damage is not covered by warranty.

If for some reason, your electronics still don’t work after drying them out, please contact us to see what your options are. All of our electronics are repairable, so please do not throw them away.

My sight glass is broken, what are my options? What if I had the iManifold less than a year and it is still under warranty?

A repair kit can be ordered from Imperial Tools Part number 10SG. If the iManifold is under 2 years old the sight glass will be replaced at no charge if manufacturers defect is suspected.

My batteries exploded

Batteries can explode for several reasons, the primary being mixing old and new batteries and second installing the batteries improperly. Batteries should be removed ASAP and the compartment cleaned out to prevent further damage. The unit will likely need to be returned for service, but a battery door could be field replaced.

Are other accessories available?

There a several accessories available for use with the iManifold system. These include wireless probes for humidity, temperature, refrigerant pressures and static air pressures. A clamp on temperature sensor (up to 1 3/8” pipe), and a 6” ambient air temperature sensor are also available. The strap probes that are supplied with the iManifold are also available for purchase.

Can the iManifold be connected to a power source?

Yes, there is a micro USB port in the back of the unit, and it can be powered through it.

Can rechargeable batteries be used?

Rechargeable AA batteries can be used, but they will not be recharged in the unit even if it is plugged in.

Can I update firmware?

The firmware in the iManifold is field-upgradeable via Bluetooth through the iManifold App.

How do I upgrade firmware?

Power on the iManifold/iConnect, go to the settings menu (right) tap “configuration” and update the firmware. Depending on the smart device, the update will take from.

Why do I need to upgrade firmware?

Anytime that new hardware is added to the iManifold system, an update in firmware is required. Check the “Configuration” section under the Connect to iManifold button once connected.

Is there a micron gauge built in?

No, the iManifold does not have a micron gauge built in (future wireless accessory).

Can the manifold assembly be rebuilt?

Yes, it is based on the Imperial 800 series manifold, and we offer a “900 series” kit for the iManifold with the black knobs.

Do I have to re-zero the instrument every time I use it?

No, the pressure sensors have good, long-term stability.

How do I clean the unit?

It can be cleaned with a damp cloth and a mild soap solution. Do not use chemicals that will damage plastic.

My iManifold is not indicating proper vacuum, what’s wrong?

The deepest vacuum possible is -29.92 inHg or -14.696 psig. If an analog or digital gauge is reading below that, it is in error. The low-side sensor on the iManifold is a compound sensor, meaning it will read accurately in both pressure and vacuum, the high-side sensor is a pressure-only sensor. It will indicate vacuum, but will not be as accurate as it was not intended for that purpose, which is why it will not typically read below -27.5 inHg.

You should not be using a digital gauge to measure vacuum, a micron gauge is required for that purpose.

Do I need to send in my 900M or 900C iManifold equipment for periodic recalibrations?

No, due to our technology, there is no need to do periodic recalibrations. In-app “zeroing” is all that is needed. If you have further questions, give our tech team a call at 716-699-2031.

iManifold App

Why are my iManifold reports are blank?

This is most likely caused by not performing a Test In or a Test Out snapshot prior to generating a report. Taking a system snapshot captures all live measurement data including user inputs and calculations that have been recorded at the moment the Take Test In or Out Snapshot button is pressed. This allows for full control over what measurement data is printed on the generated reports.

Why are there dashes (–) in some of the fields in the display?

Dashes can mean that your phone or tablet is not connected to the gauge manifold, or a temperature sensor reading is out of range. It can also mean that you don’t have a temperature sensor connected and have not manually put in values in the “User Inputs” screen.

How do I update my iManifold application?

To check for updates, go to either the Google Play Store or Apple App Store and either find the “Updates” section or search the app store for “iManifold” and look for an Update button. If you don’t see an update button or the iManifold app is not listed on an available updates page, the iManifold app is current.

You can always check the Help section of the iManifold app to determine your current version and then check our latest app release notes page here: https://imanifold.com/app-release-notes/

Why doesn't my app automatically update?

On your iPhone, iPad, or iPod touch

  1. Tap Settings > iTunes & App Store.
  2. If you’re not already, sign in with your Apple ID.
  3. Turn on the content that you want to automatically download.

I forgot my Apple ID, what do I do

Visit the following web site: https://iforgot.apple.com/

Measurements & Calculations

Why am I not calculating airflow?

Airflow can be accurately estimated within a wide range of typical operating conditions of a typical air conditioning system, however, the calculation is bound by physics and the design of the air conditioning system so there will be times that an alternate method of airflow measurement will be required*.

  • General Requirements for estimated airflow calculation:
    • Two 911-M RH/Temp probes are mapped to return air and supply air.
    • Probes are inserted in the ductwork the way they are mapped.
      • Note: If no humidity probes are used, user input measurements for supply air and return air can be made in the “Measurements” section (dry bulb and relative humidity).
    • Return Air Dry Bulb Temperature greater than 70 degrees
    • Return Air Wet Bulb Temperature greater than 50 degrees
    • Temperature split close to the temperature split targets

* If there isn’t an airflow that can be calculated because current conditions are out of range, a manual input airflow will be required for system capacity. The value can be input in the Measurements section by selecting an alternate method of airflow and then inputting the measured value in an input box.

Why am I not calculating BTUH?

Please follow the tips below to ensure BTUH can be calculated:

  • Make sure the humidity probes are connected to the network and are mapped to return air and supply air. Further, make sure that the probes are inserted in the ductwork the way they are mapped. If no humidity probes are used, user input measurements for supply air and return air can be made in the Measurements section (dry bulb and relative humidity).
  • Make sure to enter the nominal tonnage of the system. The application can only calculate the airflow per nominal ton, so a multiplier (2, 2.5, 30 tons) is required to calculate the total airflow.
  • Make sure there is an airflow reading. The app attempts to calculate estimated airflow using information from the humidity probes (911-M) inserted in the return and supply ducts
  • General Requirements for estimated airflow calculation:
    • Return Air Dry Bulb Temperature greater than 70 degrees
    • Return Air Wet Bulb Temperature greater than 50 degrees
    • Temperature split close to the temperature split target *If there isn’t an airflow that can be calculated because current conditions are out of range, a manual input airflow will be required for system capacity. The value can be input in the Measurements section by selecting an alternate method of airflow and then inputting the measured value in an input box
  • For EER calculation, make sure volts and amps are added in the electrical section. We now integrate with the Redfish iDVM-510 multimeter, which can automate the process of collecting the data instead of hand-inputting the values.

Why I am not calculating EER?

The following is required for EER calculation:

  1. All electrical measurements fields including the condenser and evaporator sections (for calculation of wattage)
  2. BTU/H Capacity (see BTU/H question for details on what is required for BTU/H)

Does the iManifold read negative pressures?

Yes, but it does not have an internal micron gauge. If you want it to read vacuum for evacuation purposes you will need an external wireless vacuum gauge that will be sold separately.

Both sides of the gauge show the same pressure with the system running. What is wrong?

Make sure that the valves labeled “HI” and “LO” are closed. The iManifold uses a conventional (800 series) manifold. The valves should only be opened when you are adding or removing refrigerant.

Bluetooth Connectivity

My Bluetooth will not connect

Try resetting Bluetooth by un-pairing the iManifold, turning off Bluetooth and restarting your Android device. When the device boots back up, turn Bluetooth back on and pair the iManifold back to the device.

My Bluetooth connects, but will not display measurements

Please try powering off and on your smart device.

Bluetooth error ‘Connection error is not a valid Bluetooth address’ on Android

Try resetting Bluetooth by un-pairing the iManifold, turning off Bluetooth and restarting your Android device. When the device boots back up, turn Bluetooth back on and pair the iManifold back to the device.

Check for apps that could be interfering with Bluetooth or the Internet such as Foxfi, a mobile hotspot app.

I see a pin code (Android-only problem)

Make sure that the iManifold has been paired with the Android device. The iManifold must be first put into pairing mode by pressing the Bluetooth button on the iManifold, followed by pairing with it.

How do I pair my Apple device?

Your Apple device does not need to be paired with the iManifold or iConnect hardware, you can simply open the app and hit the “Connect to iManifold” button.

My Apple device shows ‘Initializing…’ but never connects

Please make sure your iOS is up-to-date to ensure a good Bluetooth connection. On your iPhone or iPad, go to Settings > General > Software Update to verify your version of iOS is up to date.

What is the Bluetooth range?

Anywhere from 10 feet to 400 feet depending upon obstructions, local interference and smart device that is used.

Can multiple smart devices be connected at the same time?


How can I improve Bluetooth range?

The power of the transmitter cannot be increased; the range is about 400 feet within line of sight however it is diminished through walls. For instance, if you are working on a residential air conditioner and have the iManifold hoses connected to it and you lose Bluetooth signal when you take your phone or tablet into the house, try reconnecting when you are where you want to work (by the furnace, in the basement, attic etc). You may have lost the signal walking around the house to the door, and may be closer to the manifold at the interior work area and may be able to reconnect there.

Wireless Probes & Wireless Connectivity

Zigbee wireless probes will not connect

Verify probes are turned on and in the proximity of the iManifold/iConnect

Verify that the probes are flashing a heartbeat flash. A double flash and pause means the probe is in pairing mode and not installed in the network

If probes are heartbeat flashing and not communicating, they will need to be forced out of the network and reinstalled. To do so, press an hold the wireless button until the probe starts to double flash and pause. Tap add probes in the wireless screen and follow the directions on the screen. This problem typically occurs when probes get mixed up between users. Probes can only be assigned to a single iManifold or iConnect.

How do I zero a wireless probe/wireless probe is reading pressure?

Go to the wireless probe menu, tap the probe you wish to zero, when the probe opens, tap the gear (settings menu) with the probe exposed to atmospheric, tap the zero button to null the sensor. The sensor will not zero if there is over 3 psi on the low side and 5 psi on the high side sensor.

What is the function of the 912M (repeater & temperature) probe?

The 912M is intended primarily to be used as a repeater probe to increase wireless transmission distance. Adding additional probes to a ZigBee network adds additional paths for the signal to travel and increases the strength of the network. Place the probe at the point where the signal is getting weak. Temperature probe can also be used for additional temperature measurements.

Can the wireless manometer measure gas pressure?

No, the sensor in the manometer is specifically designed to measure air pressure only. It uses a mass flow sensor calibrated for air and will not indicate correct pressures with other gasses.

What are the two jacks on the side of the probes for?

All wireless probes have auxiliary temperature ports that can be mapped to specific functions as allowed. Pressure probes have the T1 ports dedicated to specific functions. Tap the subscript to see allowable mappings

Where do I put the return and supply probes?

The supply and return air probes should be at least 6-10’ away from the air handler preferably at the return air inlet and the first supply register closest to the air handler. They must always be out of line of sight of the air handler.

What size hole should I drill in ductwork for the 911-M Humidity Probes?

A 11/16″ hole will allow our humidity probes to fit in the ductwork.


My wired sensors are not reading correctly

All wired sensors can be mapped to their intended application. (SLT, LLT, DLT, ODA, etc.) If the probes are unmapped they will be showing T1, T2, T3, or T4 designations. Tapping on the measurement subscript will allow the mappings to be brought up and changed as required by the user.

The iManifold and iConnect use thermistor type probes that do not require field calibration. If a probe is not reading displaying dashes, or reading erratically, make sure the probe is fully seated in the socket. If the problem still persists, replace the probe. Probes are covered against manufacturer defect for a period of one year. Damage to abuse or accident is not covered. DO NOT immerse the probes in ice water to verify calibration.

My probe/sensor is reading -14.7 or 29.9

Remove the four screws in the back of the probe (battery door can be left in place) and verify that the plug is fully seated in the socket. If the probe is fully seated and is indicating -14.7 at atmospheric pressure the sensor has failed open and will need to be replaced.

My probe will not read temperature (SLT, LLT, DLT, ODA (mapping)

Pressure probes T1 ports are permanently mapped. Low pressure T1 is the SLT, and High pressure T1 is the LLT. T2 porst can be mapped, we recommend that T2 of the low pressure port be mapped to ODA and T2 of the high pressure probe be mapped to DLT when used. Mapping is done by going to the wireless probe and tapping the probe subscript.

What type of temperature sensor is compatible?

The iManifold uses Cooper Atkins sensors, but be sure to buy the ones for the iManifold. The auxiliary jacks are recessed into the back of the iManifold to protect the plugs of the sensors, however the phono plug on some Cooper Atkins sensors are too short to reach the recessed jacks.

iManifold Cloud

What is iManifold cloud

iManifold cloud provides a means of storing equipment profiles, customer information, equipment information, project information, test-in and test-out measurements, Reporting, Unlimited Data Logging and Tech Connect. All the Reports can be downloaded as PDF’s or emailed from the iManifold Cloud Website verifi.imanifold.com.

How do I use the AHRI directory feature?

Watch This Video

I forgot my cloud password, what do I do.

You can reset your password by going to this web page and entering your email address: https://verifi.imanifold.com/uf/forgot_password.php

How do I cancel my cloud subscription?

If you have subscribed with us using PayPal, you can login to your PayPal account, find your subscription, and cancel it directly from your PayPal account. If you subscribed through www.imanifold.com/shop, you can log in, find your subscription and cancel it from there. You may also call our customer service team at 716-699-2031 and ask them to cancel it. Please note that there are no partial refunds given on cloud subscriptions.

How do I add or delete technicians from my company?

Only your company cloud administrator can do this. If you are the administrator and you have already utilized all of your available seats, you may purchase additional seats at https://imanifold.com/product-category/cloud/.