What You'll Learn

• How to access System View from both mQ Classic and mQ+
• What each component in the visualization represents and how to read it
• How live probe measurements drive the animation in real time
• What tapping each component reveals about the refrigerant state at that point
• How profile changes (TXV vs piston, refrigerant type) immediately update the visualization
• How to use System View as a training tool for apprentices, classrooms, and customer conversations

What You'll Need

• Device: iPhone (iOS 15+) or Android (Android 10+) with measureQuick installed
• App version: measureQuick 3.6 or later
• Account: Any measureQuick account (free, paid, or Premier - System View is available to all users)
• Probes: Smart tools connected via Bluetooth with live measurements flowing (System View works with partial data, but the more probes connected, the more complete the visualization)
• Profile: System profiled with equipment type, refrigerant, and metering device configured
• Knowledge: Basic understanding of the refrigeration cycle (see Refrigeration Cycle Basics) and superheat/subcooling concepts (see Superheat & Subcooling)
• Time: 10-15 minutes to read; explore in the field with a live system for the full experience

Step-by-Step Guide

Step 1: Accessing System View

System View is one of three view modes available during a test, alongside Grid View and Trending View.

In mQ Classic:

1. Start or open a test with probes connected
2. Look for the view switcher at the top of the measurement screen
3. Tap System View (the icon resembles a simplified refrigerant circuit)

In mQ+:

1. From the project workflow, tap the view switcher
2. Select System View from the options (Grid View, Trending View, System View)

View switcher showing Grid, Gauges, and System tabs with System View selected

System View requires a profiled system. If you have not completed the equipment profile (refrigerant type, metering device, system configuration), the visualization will be incomplete or unavailable. Complete your profile first (see Profiling Your System).

Tip: System View is available at every subscription level, including free accounts. It works in both mQ Classic and mQ+ interfaces. You do not need Premier Services to use it.

Step 2: Understanding the Layout

System View displays a schematic representation of the complete HVAC system. The layout follows the standard vapor-compression cycle, arranged so you can trace the refrigerant path from component to component.

Full System View showing all components labeled - condenser at top, evaporator at bottom, compressor on the right, metering device on the left, with refrigerant lines connecting them and airflow arrows on both indoor and outdoor sections

The major components, from top to bottom:

Condenser (top of screen) The outdoor coil where the refrigerant rejects heat. Displayed with outdoor airflow arrows showing air moving across the coil. The condenser graphic includes a liquid seal indicator - a visible liquid level inside the coil that represents subcooling. The higher the liquid level, the more subcooled liquid is present. Low subcooling shows a lower liquid level; high subcooling shows a higher level.

Compressor (right side) Shown between the condenser and evaporator on the discharge/suction lines. The compressor graphic includes indicators for gas velocity and state at the inlet and outlet.

Metering Device (left side) Displayed between the condenser and evaporator on the liquid line. The graphic changes based on your profile:

• Piston (fixed orifice): A simple restriction point
• TXV (thermostatic expansion valve): Shows the TXV body, sensing bulb attached to the suction line, and the external equalizer line

Evaporator (bottom of screen) The indoor coil where refrigerant absorbs heat. Displayed with indoor airflow arrows, the air filter, and the indoor fan. The evaporator graphic shows the refrigerant level inside the coil and bubble density representing the two-phase mixture as refrigerant evaporates. Lower superheat means more of the evaporator is flooded with liquid; higher superheat means the refrigerant boils off earlier in the coil, leaving more of the evaporator carrying superheated gas.

Connecting Lines Refrigerant lines connect all four components with animated flow. The animation shows:

• Flow direction (clockwise in cooling mode)
• Refrigerant density (denser flow in the liquid line, lighter flow in the suction line)
• Speed (faster flow indicates higher mass flow rate)

Additional Elements

• Dryer / Sight Glass: Shown on the liquid line between the condenser and metering device
• Air Filter: Displayed at the return air side of the evaporator, with face velocity color ranges
• Condensate Line: Below the evaporator, showing dehumidification output
• Charging Blanket: Appears when a charging blanket probe is connected, with open/close indicators

Step 3: What the Visualization Shows in Real Time

System View is not a static diagram or a simulation. Every visual element is driven by your live measurement data. As readings change, the visualization updates.

Here is what each visual indicator reflects:

Liquid Seal in the Condenser The liquid level inside the condenser coil represents the degree of subcooling. As subcooling increases, the liquid seal rises - this means more of the condenser is filled with subcooled liquid, which is normal for a properly charged system. If subcooling drops, the liquid level drops, indicating the system may be undercharged or that condenser airflow is restricted.

Refrigerant Level and Bubbles in the Evaporator The evaporator shows refrigerant as a mix of liquid and gas (bubbles). The density of bubbles indicates how much of the refrigerant has evaporated at each point in the coil. With a TXV system holding 8-10 degrees of superheat, the evaporator appears mostly flooded with liquid and the refrigerant boils off near the end of the coil. With a piston system running higher superheat, the boiling happens earlier and more of the coil carries superheated gas.

Flash Gas at the Metering Device As high-pressure liquid passes through the metering device, the pressure drops and some refrigerant immediately flashes to gas. The visualization shows this transition at the metering device output. The amount of flash gas is related to the pressure drop across the device.

Refrigerant Flow Animation The speed and density of the animated refrigerant flow respond to measured pressures and temperatures. Faster flow with denser liquid in the liquid line and lighter gas in the suction line is normal. If flow appears sluggish or inconsistent, it reflects what the measurements are reporting.

Filter Face Velocity The air filter graphic uses color-coded ranges to indicate face velocity based on measured airflow and filter area:

• Green: Ideal range
• Yellow: Acceptable but not optimal
• Orange/Red: Warning or excessive velocity, indicating potential airflow restriction

System View evaporator section showing refrigerant flow, air filter, and airflow indicators

Step 4: Tapping Components for Details

Every component in System View is tappable. Tap any element to open an educational overlay that explains what is happening at that point in the cycle.

What tapping reveals:

System View with evaporator tapped showing superheat overlay with temperature values and explanation

The educational overlays are written in plain language. They explain not just the current value but what it means for the system. A technician who taps the condenser and sees "Subcooling: 12F (target: 10-15F)" also reads an explanation of why subcooling matters and what would change if the value were out of range.

Tip: Spend time tapping every component on a system you know well. This builds your mental model of how the measurements relate to each other. When you encounter an unfamiliar system, the same tap-to-learn pattern applies.

Step 5: How Profile Changes Affect the View

System View responds immediately to profile changes. This makes it a powerful tool for understanding how different system configurations affect refrigerant behavior.

Metering Device Change (Piston to TXV): When you change the metering device from piston to TXV in the equipment profile, the visualization updates instantly:

• The piston graphic is replaced by a TXV body with a sensing bulb mounted on the suction line and an external equalizer line
• The evaporator shows a more flooded state because a TXV maintains a tighter superheat target (typically 8-10F) compared to a piston
• The diagnostic target emphasis shifts from superheat (piston primary) to subcooling (TXV primary)

Refrigerant Type Change: Changing the refrigerant type in the profile recalculates all saturation temperatures and adjusts the pressure-temperature relationship throughout the visualization. The same measured pressures produce different condensing and evaporating temperatures depending on the refrigerant.

System Configuration Change: Switching between split system, package unit, cooling only, or mini-split adjusts the visualization layout to reflect the physical configuration.

System View with TXV metering device showing sensing bulb and equalizer line

System View with piston (fixed orifice) metering device

Tip: If you are training a new technician on the difference between TXV and piston systems, open System View on a live system and toggle the metering device in the profile. The visual change makes the concept concrete in a way that a textbook diagram cannot.

Step 6: Real-Time Measurement Integration

As the system runs and stabilizes, System View updates continuously. This is where the visualization becomes a diagnostic tool, not just an educational one.

During system startup:

• Pressures are changing rapidly as the compressor builds head pressure
• The evaporator refrigerant level shifts as the system reaches equilibrium
• Superheat and subcooling values fluctuate
• The visualization reflects all of this in real time

After stabilization:

• The liquid seal in the condenser settles to a consistent level
• Evaporator flooding reaches a steady state
• Refrigerant flow animation becomes smooth and consistent
• Tapping components shows stable values that match your probe readings

When something is wrong:

• Low subcooling shows a low liquid seal in the condenser - visually obvious at a glance
• High superheat shows extensive bubble density through most of the evaporator
• Restricted airflow changes the filter velocity indicator to yellow or red
• The visualization makes system problems visible before you even look at the numbers

System View on a system with low subcooling, showing the condenser liquid seal at a very low level and the subcooling value highlighted in red

Step 7: Full-Screen Mode

Tap the full-screen button (corner of the System View screen) to expand the visualization to fill the entire display. Full-screen mode provides:

• Larger component graphics for easier reading
• More room for animated refrigerant flow
• Better visibility of small elements like the TXV sensing bulb or sight glass
• Ideal presentation format for training sessions or customer conversations

To exit full-screen mode, tap the minimize button or swipe down (depending on your platform).

Additional display controls:

• AA button: Toggles the air side of the visualization on and off. When the air side is hidden, only the refrigerant circuit is displayed. This is useful for focusing on the refrigeration cycle without the visual complexity of airflow, filter, and ductwork elements.
• Text size +/- controls: Adjust the size of measurement labels and values on the visualization. Increase text size for training presentations on a TV or projector; decrease it for a more compact view on a phone screen.

measureQuick System View showing the full refrigerant cycle visualization with evaporator, compressor, condenser, and TXV, plus measurement values and the AA button at the bottom left

Using System View as a Training Tool

System View was built with training in mind. Jim Bergmann spent 12 years drawing the refrigeration cycle on a whiteboard during training events. System View replaces that whiteboard with a live, measurement-driven visualization.

Classroom and Training Unit Use

Connect measureQuick to a training unit with probes. Display System View on a large screen (via screen mirroring or HDMI adapter). Students can:

• Watch refrigerant behavior change in real time as the system runs
• See the effect of adding or removing charge (subcooling and superheat change, liquid seal rises or drops)
• Observe the difference between TXV and piston behavior by changing the profile
• Tap components to read educational explanations

This approach shifts training from abstract concepts to observable relationships. Instead of memorizing "low subcooling means undercharge," students see the condenser liquid seal drop and the subcooling value decrease simultaneously.

Teaching Apprentices in the Field

When working with an apprentice on a live job, switch to System View before explaining the system's condition. The apprentice can see:

• Where the refrigerant is in the cycle
• What state it is in at each point (liquid, gas, two-phase)
• How the measurements connect to the physical components
• What "normal" looks like versus what "a problem" looks like

Have the apprentice tap each component and read the explanation. Then compare it to what they observe physically at the unit.

Customer Education

System View provides a visual that homeowners can understand. While a screen full of numbers is meaningless to most customers, a visualization showing liquid flowing through coils, gas returning to the compressor, and a clear subcooling indicator makes the technician's findings tangible.

For example, if subcooling is low and the system is undercharged, you can show the customer:

• The condenser liquid seal is low
• Tap the subcooling display to show the value below target
• Explain that this means the system does not have enough refrigerant to cool efficiently

This turns an abstract diagnosis into something the customer can see and understand.

Tips & Common Issues

System View shows a blank or incomplete visualization

System View requires a completed equipment profile. If the refrigerant type, metering device, or system configuration is not set, the visualization cannot render correctly. Complete the profile, and the view will populate.

If the profile is complete but the visualization still looks incomplete, confirm that probes are connected and streaming live data. System View relies on measurement data to drive the animation. Without pressure and temperature readings, the visualization has nothing to display.

The evaporator looks almost entirely flooded

On a TXV system running at its target superheat (typically 8-10F), most of the evaporator is filled with liquid refrigerant. The boiling transition happens near the end of the coil. This is normal for TXV operation. If you switch the profile to piston, you will see more bubbles and a lower flooding level because piston systems typically run at higher superheat.

The liquid seal looks too high or too low

The condenser liquid seal reflects your measured subcooling. High subcooling (which can indicate overcharge or a restriction) shows a high liquid level. Low subcooling (which can indicate undercharge) shows a low level. If the liquid seal does not match your expectation, check the subcooling value by tapping the condenser. The number tells you the exact measurement.

Can I use System View without probes connected?

System View will display the system layout even without live data, but the animation and measurement-driven elements will not function. The educational tap-to-learn overlays are still available. For a training classroom without a live system, this still provides value, but connecting to a training unit with probes gives the full experience.

System View does not match what I see on Grid View

System View and Grid View display the same underlying data. If a measurement appears different, check that you are reading the same value. System View presents some measurements as visual indicators (liquid seal height, bubble density) rather than exact numbers. Tap the component for the precise value, which will match Grid View.

The metering device looks wrong

System View displays the metering device based on your equipment profile. If the profile says "piston" but the actual system has a TXV (or vice versa), the visualization will not match reality. Update the metering device in the profile, and the visualization updates immediately.

Using System View on a heat pump

System View adjusts for heat pump operation. In cooling mode, the layout is the same as a standard A/C system. In heating mode, the refrigerant flow reverses (the outdoor coil becomes the evaporator, the indoor coil becomes the condenser). The visualization reflects the active mode based on your test configuration.

Related Articles

Prerequisites:

• Refrigeration Cycle Basics
• Pressure-Temperature Relationship
• Superheat & Subcooling

Follow-up articles:

• Charge & Airflow Balance
• Overcharge & Undercharge Recognition
• Reading Diagnostic Flags

Related in the same domain:

• Grid View
• Choosing Your Interface: mQ Classic vs mQ+
• Profiling Your System

Need Help?

Contact measureQuick support: support@measurequick.com