Disklavier Controller vs Refrigerant Charge HVAC

• This exciting application allows you to control many of the basic functions of your Disklavier. More: • This exciting application allows you to control many of the basic functions of your Disklavier. - Main volume - Start and stop song playback - Selection of sources, albums, and songs - Simple recording functions - DisklavierRadio playback (some functions not available) - Balance, Transpose, Tempo and Part Cancel control • You can title a song after recording it. • Communication with the piano is via WiFi, so you can control your Disklavier from anywhere that your WiFi signal is available in your home. Notes: • This application will only work with compatible Disklavier models (Disklavier Mark IV Series Version 4.00 or later, E3 Series Version 3.00 or later, and DKC-850 Version 3.10 or later). • The iPhone/iPod touch/iPad must be connected to a WiFi access point that is on the same network as your Disklavier for this application to function.

Refrigerant Charge Calculator is built by HVAC technicians for HVAC technicians to calculate additional refrigerant charge requirements. Calculate additional refrigerant charge requirements for copper line sets based on liquid and suction line length and diameter - supporting 10 refrigerants including R-410A, R-454B (next-gen replacement), R-32 mini-splits, and EPA 608 refrigeration blends. FEATURES: Calculate Additional Refrigerant Charge - For copper line sets of any length 10 Refrigerants Supported - R-410A, R-22, R-454B, R-32, R-407C, R-134a, R-404A, R-507A, R-290, R-717 Liquid Line Diameters - 9 sizes from 1/4" to 1-1/8", including 5/16" mini-split Suction Line Diameters - 3/8" to 2-5/8" standard copper sizes Results in Multiple Units - Ounces (oz), pounds (lbs), and grams (g) Industry-Standard Data - aligned with OEM long-line guides (Goodman, Carrier) Warnings for Long Line Sets - Alerts when unusual refrigerant quantities are needed 100% OFFLINE OPERATION: Works without internet connection. All refrigerant charge data built into the app - no server calls, no delays, no data leakage. Perfect for job sites without cellular coverage. HOW IT WORKS: 1. Select your refrigerant type (R-410A, R-454B, R-32, etc.) 2. Enter liquid line length (feet) and diameter (inches) 3. Enter suction line length (feet) and diameter (inches) 4. Get instant charge calculation in oz, lbs, and grams WHY YOU NEED THIS CALCULATOR: When installing split systems, mini-splits, or equipment with long line sets, the factory charge only covers standard line length (typically 25 ft). Every extra foot of copper tubing requires additional refrigerant. This calculator provides exact amount based on industry charge-per-foot tables - preventing system undercharge that destroys compressors. SUPPORTED REFRIGERANTS: R-410A - Residential AC & heat pumps (most common 2026) R-22 - Legacy systems still in service (phaseout complete 2030) R-454B - Next-generation R-410A replacement (EPA mandate 2025+) R-32 - Mini-split & VRF systems (lowest GWP option) R-407C - Commercial AC applications R-134a - Auto AC & water chiller systems R-404A - Commercial refrigeration freezers R-507A - Low-temperature refrigeration systems R-290 - Propane systems (hydrocarbon alternative) R-717 - Ammonia industrial refrigeration OPTIONAL PRO UPGRADE — $2.99 ONE-TIME IN-APP PURCHASE The following features require a separate one-time in-app purchase. They are not required to use the calculator: • Unlimited saved calculation history • PDF export of results • Dark theme • Ad-free experience ACCURACY STANDARDS: Charge-per-foot values computed from NIST REFPROP-grade refrigerant densities (liquid line at 70°F, suction vapor at 40°F saturation) and aligned with manufacturer long-line guides (Goodman, Carrier). Covers both liquid and suction line contributions. Always follow your unit's installation manual when it specifies a different per-foot value. PERFECT FOR: HVAC technicians installing split systems and heat pumps Mini-split installers designing ductless systems Refrigeration mechanics sizing refrigerant lines AC contractors bidding and executing long line set jobs HVAC students and apprentices learning charge calculations Building maintenance engineers commissioning new equipment Equipment commissioning specialists verifying correct charges Service technicians replacing line sets on existing systems Accurate refrigerant charge calculations prevent undercharge, overcharge, and system failure on every installation and service call. Part of HVACTools Suite - professional HVAC technician and refrigeration calculator app collection for field diagnostics and system commissioning.