FREE APP FREON - HVAC REF PRO Professional Field Reference & Diagnostics Platform

 


HVAC REF PRO Professional Field Reference & Diagnostics Platform

This app is built as a high-performance, zero-latency PWA (Progressive Web App) designed specifically for the rugged demands of field service.

Here is the "under the hood" breakdown of the stack and the diagnostic logic:

🛠 The Tech Stack

  • Core: React 18 + TypeScript (Strict Mode).
  • Build Tool: Vite 7 (optimized for single-file deployment).
  • Styling: Tailwind CSS 4.0 (using a high-contrast palette for sunlight visibility and dark-mode for mechanical rooms).
  • Animations: Framer Motion (for smooth layout transitions between tools).
  • State Management: Custom React Hooks + Context API (for global unit and theme persistence).
  • Storage: localStorage API (100% offline, zero data leaves the device).
  • Icons: Lucide-React (vector-based for sharp rendering on any screen).

🧊 Refrigerant Physics & P/T Logic

  • Calculation Engine: Uses Linear Interpolation Algorithms across discrete datasets for 10+ refrigerants (R-410A, R-32, R-454B, etc.).
  • Curve Fitting: The data points are modeled based on Refprop 10 standards to ensure sub-degree accuracy.
  • Glide Management: For zeotropic blends (like R-407C), the app calculates the Mean Saturation Point and then applies a ± offset based on the specific refrigerant's glide to provide Dew Point (for superheat) and Bubble Point (for subcooling).
  • Absolute Math: Compression ratios are calculated using PSIA (psig + 14.7) to ensure thermodynamic accuracy.

🧠 The Smart Diagnostic Engine

The "Pro Diagnostics" module uses a Rule-Based Expert System that analyzes the "Big Four" relationships:

  1. Mass Flow Check: Relationship between Suction Pressure and Superheat.
  2. Heat Rejection Check: Relationship between Discharge Pressure and Subcooling.
  3. Efficiency Check: Compression Ratio vs. Rated Amp Draw.
  4. Heat Exchange Check: Return/Supply Air Delta-T (Evaporator Split) and Approach Temperatures (Condenser).

Example logic flow for "Restriction Detection":

  • IF Suction Pressure is LOW
  • AND Superheat is HIGH
  • AND Subcooling is NORMAL/HIGH
  • THEN Diagnose as Liquid Line Restriction (rather than low charge).

📐 Mechanical & Electrical Tools

  • Ohm's Law: Full algebraic transposition (V=IR, P=VI) allowing any two inputs to solve the remaining two.
  • Capacitor Formula: Uses the run-time formula MFD=(Amps×2652)/Volts to allow techs to check caps without disconnecting them from the circuit.
  • Unit Conversions: High-precision floating-point math for converting obscure service manual units (like in. w.c. to kPa or lb to kg).

📡 Deployment Architecture

  • Single-File Build: The entire app (HTML, CSS, JS, SVG assets, and Refrigerant DB) is bundled into a single file (~180KB gzipped).
  • Zero-Cloud: No API calls, no login, no tracking. This makes the app instant even in deep basements or data-dead zones where traditional HVAC apps fail to load.

In short: It’s a specialized HVAC calculator wrapped in a modern web shell, engineered for speed and precision.