Changelog

Changes to all tools on CO2piping.com, latest version first.

Version 38.1 · 2026-11-06

FixedTroubleshooting: The indicator lamps now light up even when the device setting “reduce motion” is on, and can be started and stopped by hand, one at a time or all at once. On phones the start/stop button no longer covers the text.
ImprovedPipe routing on a drawing: + Marker adds more size markers to a pipe, the kW can be hidden per evaporator, evaporators and loads can be resized with the mouse, and comments can be a cloud, ring, rectangle or arrow in a colour of your own. Fixed: the white edge behind texts on the drawing hid pipes and lines.

Version 38 · 2026-11-05

NewCold Room Load – Coolers and Freezers: New calculator: Cold room load – refrigeration load per 24 h and design capacity (kW) of a cold or freezer room, with the room drawn in plan and section, warnings for running time over 21 h and for an evaporator ΔT outside 4–15 K.
NewPipe Insulation Thickness: New calculator: Pipe insulation thickness – thickness against condensation and heat flow, minimum thickness by country, and an editable cross-section of the insulated pipe.
ImprovedWebsite: Phone and tablet: larger touch targets (at least 40 px), drag symbols in the drawings with a finger, and press and hold instead of right-click in every calculator.
ImprovedTroubleshooting: Indicator lamps and display symbols for 107 controllers and thermostats (170 new, 48 corrected), Evco lamps, and the error codes of Fujitsu AIRSTAGE J-II.
NewTroubleshooting: New: “Don't know – help me choose” finds the machine type from the rating plate (brand, model or refrigerant), from what the machine cools or heats, or with yes/no questions and sketches.
FixedElectrical calculator: The current a gG fuse needs to disconnect in 0.4 s is corrected against the SFS 6000 table; some values were 7–40 % too low before.
ImprovedPipe routing on a drawing: Help (?) for Save as and Copy link, and the liquid line is marked LL in all languages.

Version 37 · 2026-11-03

NewWebsite: One save box in every calculator: Save, Save as and autosave write a link file (.html) that opens the project with a double-click; buttons are colour-coded by task, and older .json files still open.
ImprovedWebsite: The switch between the dark and the light theme is now at the top of every page, next to the language menu.
NewWebsite: “Tools for the job”: Amazon search links for the tools a task needs, marked as advertising, in several calculators and guides; shown only where an Amazon store with a partner ID exists.
ImprovedPipe routing on a drawing: Dimension lines in six styles, per pipe section and movable with the mouse; Undo and Redo; draw pipes in both directions and a main with an open end; evaporator names inside the symbol; flowchart markers with a leader line and adjustable size.
FixedElectrical calculator: Cable tables checked against HD 60364-5-52: XLPE with three loaded conductors, method C, corrected (up to 17 A too high before), and the grouping factors for cables in the ground corrected.
NewKnowledge base: New guide: tool list for refrigeration technicians and CO2 installers, with the pressure ratings and A2L/A3 approvals to check.
ImprovedKnowledge base: Mexico: the HFC baseline and the 7.5 % reserve confirmed from SEMARNAT's 2025 guide.
ImprovedProject schedule: Print and export from a chosen date or week onwards; long PDF strip, rotate 90°, Excel and CSV gathered in the save box.
ImprovedHeating & cooling: Group headings in the fluid and pipe menus are easier to see.

Version 36 · 2026-11-02

NewWebsite: Light theme for the whole site: switch with the link at the bottom of every page; printouts look the same in both themes.
NewWebsite: Save as… and autosave (every 1–15 minutes, to the chosen file in Chrome and Edge, otherwise in the browser) in every calculator, plus Save link file and Copy link to share a project without sending a file; old project files open as before.
NewWebsite: Show calculation: a hidden tab with the calculation per pipe (mass flow, density, velocity, Re, friction factor, Δp) and its basis (method, equations, fluid data, standards), optionally on the printout.
FixedWebsite: Contrast checked and corrected to WCAG AA in both themes; links in the FAQ sections and the footer are easier to read.
ImprovedGWP and CO2e: GWP table for 35 refrigerants (AR4, AR5, AR6 and EU values) and eight new questions and answers.
ImprovedRefrigerant retrofit: New section “What replaces R404A?” with R448A, R449A, R452A, R454C and R455A compared.
NewKnowledge base: New article on the rules for secondary cooling systems (glycol, brine, CO2, chilled water); R404A replacements in the switching guide.
ImprovedElectrical calculator: Boat table checked against 33 CFR 183.425 (engine room factor 0.85); IP codes are now saved in the project file.
NewHFC/HFO refrigerants: Multipack: a circuit with two or more compressors in parallel is handled in the rule check.
ImprovedPipe routing on a drawing: Draw a pipe yourself, start points (another floor or a branch of a main), pipe size labels in three styles and full-screen drawing.
FixedDomestic water: A pipe of zero length no longer stops the drawing from being shown.
ImprovedTroubleshooting: Search titles with error codes and the number of manufacturers.

Version 35 · 2026-11-01

FixedCO2 steel pipe: Steel pipes: allowable stress for 316L (1.4404) now 150 MPa, the tube value from EN 10216-5 (was a plate value); an empty temperature field no longer stops the calculation and switching to kelvin no longer changes the result.
FixedHeating & cooling: The friction factor is limited so that an extreme input can no longer give an infinite pressure drop; larger help buttons on touch screens.
FixedDomestic water: Negative pressure drops and zero velocity are rejected, and new loads always end up in the right box.
ImprovedRelief line: Australia/New Zealand: the correct designation AS/NZS 5149.1:2016 (ISO 5149-1:2014, MOD).
ImprovedHFC/HFO refrigerants: EU 2026/1975: the exemption for compressed-air dryers shown under small chillers; pounds and kilograms convert without rounding errors.
ImprovedGWP and CO2e: Spain: no tax for GWP up to 150; Denmark: mobile refrigeration exempt; charges exactly on a limit (3 kg, 10 kg, 15 lb) now fall on the right side; landscape print keeps the flow diagram and parts table on one page.
FixedHC refrigerants (A3): Larger touch targets on mobile and corrected Hindi texts.
ImprovedRefrigerant retrofit: Australia/New Zealand: AS/NZS 5149.1:2016 and the licence rules; unnamed units no longer overwrite each other.
ImprovedElectrical calculator: Cable table with the maximum length per row for disconnection time and voltage drop, cable types per country, 0.4 s disconnection up to 63 A (IEC 60364-4-41 AMD1:2017); no negative losses and decimal commas accepted.
FixedCapillary tube: The flow diagram fills a landscape page and a suction line of 0 mm is rejected.
NewPipe routing on a drawing: Water pipes for heating, cooling and brine with pump head, balancing, reverse return and insulation; CO2 in steel pipes, locked gas cooler lines and a drawing legend that fits under the plan on paper.
ImprovedKnowledge base: F-gas article updated with EU 2026/1975 (compressed-air dryers) and corrected figures.
NewTroubleshooting: Animated gallery of blink codes, all codes per brand and model in the guide, and a PDF with the guidance followed.
ImprovedProject schedule: Netherlands: 5 May (Liberation Day) is a public holiday every fifth year.

Version 34 · 2026-10-30

ImprovedPipe routing on a drawing: Drawing tools: alternative routes when re-routing, branches as separate mains per evaporator type, pipes sharing a route with their own order and shades for gas cooler lines, right-click to delete, Shift-drag of a straight run, R to rotate and a mouse and keyboard help box.
NewPipe routing on a drawing: Pipe dimensions along the pipe with leader lines and a show/hide button, ball valves placed automatically, hangers in the bill of materials, pipe division in mm or inches, a comparison table for alternative routes and a choice of how clearly the plan is drawn.
NewTroubleshooting: Alarm codes from 213 more manuals (51 control systems, 874 codes), a guided start in four steps, a manufacturer filter in the guide and a service report filled in from the guide.
ImprovedElectrical calculator: Easier to use: steps 1–3, calculation cards in groups, short warnings, an address per calculation, a result row on mobile and an interactive wiring diagram; charging rules for Finland (SESKO).
NewCapillary tube: Heat exchange with the suction line calculated from the soldered length and geometry (Gnielinski, counterflow); a measured return gas temperature can be entered instead.
NewGWP and CO2e: Timeline per circuit with the dated bans and requirements that apply to it.
NewRefrigerant retrofit: Pressure–temperature table on the checklist, a warning for the compressor's highest pressure ratio, several units in one project with a summary, and links to the HFC, HC and CO2 tools.
ImprovedRefrigerant retrofit: Rules updated after a review against the law texts: Australia (top-up only with equal or lower GWP), Japan and the USA.
ImprovedHC refrigerants (A3): Standards and rules updated: AS/NZS 5149.1:2016 for Australia and New Zealand, UL 60335-2-89 limits for the USA, Sweden, Japan, Canada (BC and Alberta), South Africa and Switzerland.
NewKnowledge base: New article: service guide for transcritical CO2 systems, and a new article on the rules in Austria.
ImprovedKnowledge base: Articles checked against the archive of law texts: corrected reporting rules for China, certification references for Sweden and inspection rules for pressure equipment.
ImprovedHFC/HFO refrigerants: Denmark: the other exemptions of BEK 1511/2025 are listed.

Version 33 · 2026-10-28

NewTroubleshooting: Alarm and fault codes from about 190 manufacturers' manuals: 123 controllers and devices, about 1,850 codes grouped by cause, with a manufacturer filter and exact code search.
NewTroubleshooting: Simulated indicator lamps that blink in the same pattern and rhythm as the device's flash code; shown as text when animations are turned off and on the printout.
ImprovedTroubleshooting: 84 checks from the manufacturers' manuals in the symptoms, such as coil resistances, flash codes and start-up checks.
NewCO2 copper tube: Every pipe has a number in the diagram, the tables, the bill of materials and the printout; branches show their length, and each pipe type has a help button.
ImprovedCO2 steel pipe: Pipe type names lead with the steel grade, with help on the steel pipe types.
NewRelief line: Fire relief rate (Qmd) in simple mode, minimum outlet height and distances in the diagram for the USA (ASHRAE 15) and Canada (CSA B52), and EN ISO 24664:2024 next to EN 13136.
ImprovedRelief line: Noise: German TA Lärm guideline values as a preset, with the source.
NewPipe routing on a drawing: Several gas coolers or condensers in parallel per system, a main line along a chosen route, and valve type, line and pressure class per valve.
ImprovedHFC/HFO refrigerants: Region choice in the charge section, charge in lb for the USA, California (17 CCR § 95374) and Türkiye (F-gas regulation 2024).
ImprovedKnowledge base: Country comparison table, PED 2014/68/EU, EN ISO 24664 and Latin America; California and Türkiye added.
ImprovedRefrigerant retrofit: Türkiye: servicing ban for GWP ≥ 2500 in larger equipment from 2031.
ImprovedElectrical calculator: Finland: SESKO recommendation for residual current devices on EV chargers.
NewHeating & cooling: Pipe insulation per size and thickness in the pipe list; material table checked against manufacturers' data sheets.
NewProject schedule: Several activities per group, light and dark theme, weekend colour, sharper row lines, notes on their own line, drag and drop that moves only what is dragged, copy and paste, and Excel export with weekdays in your language.
ImprovedWebsite: Home page: relief lines to EN 13136 / EN ISO 24664.

Version 32 · 2026-10-27

ImprovedWebsite: New symbol and colour for each tool on the home page, with the refrigerant pipe tools first. Frequently asked questions now link to the tool that does the calculation.
NewWebsite: "Export PDF" button next to Print in every tool; the PDF has the same pages as the printout (A4, A3, A1).
ImprovedWebsite: Translations reviewed and corrected in all 20 languages (technical terms, meaning, leftover English), and the privacy policy extended with legal basis, retention periods, transfers to the USA and all your rights.
FixedCO2 copper tube: Pressure rating of brazed copper tube now based on annealed copper (41 MPa), since brazing anneals the tube at every joint. Automatic pipe type only for copper.
ImprovedCO2 steel pipe: Information line when P265NL is used below its impact-test temperature of −40 °C; the order code in the bill of materials uses each pipe's own type.
ImprovedHFC/HFO refrigerants: Switzerland: ChemRRV annex 2.10 as in force from 1 January 2027, with the transitional rules. Denmark text corrected.
ImprovedGWP and CO2e: Hydrocarbons in blends with the legal GWP of EU 2024/573 annex VI; new refrigerants R407H, R417A, R442A, R450A and R452B; Singapore, Switzerland 2027 and USA updated.
FixedRefrigerant retrofit: Hydrocarbons with the legal GWP of EU 2024/573 annex VI; Singapore rules from 2022.
ImprovedRelief line: Steel proposal depends on the discharge temperature (below −40 °C only nickel steel, stainless steel or copper); USA with ammonia refers to ANSI/IIAR 2; the diagram fills the landscape page.
ImprovedCapillary tube: EU bans: household refrigerators and freezers with F-gases from 2026, self-contained commercial units with GWP ≥ 150 from 2025; R22 text corrected.
FixedElectrical calculator: Australia and New Zealand: ambient temperatures 40/25 °C and 30/15 °C with a note on AS/NZS 3008; standard editions updated.
FixedKnowledge base: Portugal and Romania: the service ban for GWP ≥ 2500 applies to all refrigeration equipment; Switzerland with the 2027 limits; Hungary 12 March 2029.
NewPipe routing on a drawing: Route style "traditional" (straight main with branches) and ball valves that can be dragged.
ImprovedDomestic water: Legionella source by language (BFS 2024:8, HSE) and UPC Appendix M mentioned.
ImprovedHeating & cooling: Sweden refers to BFS 2024:8, Switzerland to MuKEn/EN-103; the insulation help covers all of annex 8 of the German building energy act.
FixedProject schedule: Plural forms correct in all languages ("1 event").
ImprovedTroubleshooting: "Calculate further" links from the symptoms to the tool that helps.

Version 31 · 2026-10-26

NewPipe routing on a drawing: New tool: pipe routing on a floor plan. Load a drawing (PDF, image or DXF) and place the unit and evaporators; the pipes are routed at right angles with shared mains and sized for CO2, HFC and HC, with a colour per line, pipe heights and ball valves.
ImprovedTroubleshooting: Measured-value guide, works offline on the phone, printable service report, three new machine types, 19 new symptoms, alarm codes for Danfoss ERC 21X, EKC 202 and AK-CC 550A, and the most likely causes first with a check for each.
NewKnowledge base: New articles on Singapore and Latin America (Mexico, Colombia, Chile, Argentina) and a step-by-step guide to changing from HFC to CO2 or propane. The articles on Australia, Switzerland, the USA and the EU F-gas rules are updated from official sources.
ImprovedCO2 copper tube: Automatic pipe type per line (Auto); the pipe type is shown on every line, in the tables, in the bill of materials and in the printout.
NewDomestic water: US method from IPC 2024 Appendix E (fixture units), and other countries with sources.
ImprovedRelief line: Printout with the valve table at the top, the valve data sheet can be read from PDF or Excel, and Canada (CSA B52 as summarised in ABSA AB-275).
ImprovedCapillary tube: Charge of the circuit, checked against the limits per appliance type and country (IEC 60335-2-24 and -89, EPA SNAP 26, EN 378).
ImprovedElectrical calculator: More installation methods and aluminium, cable tables for boats and ships, and Japan's current-carrying capacities.
ImprovedRefrigerant retrofit: Compressor polynomials (EN 12900), cost of the charge, a printable conversion record, and Japan's limits under the High Pressure Gas Safety Act.
ImprovedHFC/HFO refrigerants: Rules for Switzerland (ChemRRV annex 2.10, version in force), California (CARB) and Singapore, and the US limits under 40 CFR 84.54.
ImprovedGWP and CO2e: Singapore's rules for 2027 and 2028, Switzerland's refill and leak-detection rules, Hong Kong and Puerto Rico, and Denmark under BEK 1511/2025.
ImprovedHC refrigerants (A3): Switzerland, Japan and the UK, certification under (EU) 2024/2215, the new location "Below ground", and EN 378 table C.2 and the LFL of R1270 corrected.
ImprovedHeating & cooling: Rules per country, and Germany's insulation thicknesses under the GModG (formerly GEG), annex 8.
ImprovedProject schedule: Working days, public holidays per country and own days off, templates, and full screen on the phone.
ImprovedHFC/HFO refrigerants: Choice of application (shop, cold store, process cooling, chillers, AC, heat pump, ice rink) with application temperature, so that the rules per country are shown for the right kind of plant.
ImprovedRelief line: Pressure loss in bends per Crane TP-410.

Version 30.1 · 2026-10-25

ImprovedProject schedule: Red line when dragging in the name column, the selected day marked for new events, a clickable delay warning and Mark as done.

Version 30 · 2026-10-25

NewWebsite: New page "Report a bug": what counts as a bug and what to send (tool, steps, saved project file, screenshots). Linked at the bottom of every page.
ImprovedWebsite: The Beta labels have been removed. New tools show a line with a link for reporting errors instead.
NewWebsite: Voluntary support of the site with PayPal or Revolut, on the About us page.
ImprovedElectrical calculator: Cable table per country, short circuit and disconnection time, distribution board with groups, transformer, selectivity, RCD selection, standard IE3 motors and battery with solar panels and charger.
FixedProject schedule: Names are drawn on top of the bars in PDF and printouts, and the day labels fit on phones with enlarged text.
FixedWebsite: Old addresses of the troubleshooting pages now redirect to the new ones.
ImprovedProject schedule: PDF as one long strip, everything turned 90° clockwise for printing, PDF, Excel and CSV, reverse dependencies per event, own colour per event, and names on a white background in PDF sheets.

Version 29 · 2026-10-24

NewElectrical calculator: New electrical calculator (Beta): current, power, voltage drop, cable, fuse, motors Y/Δ, single and three phase, AC/DC, grids by country and power on boats and ships, with wiring diagram.
NewCapillary tube: New capillary tube calculator (Beta): bore and length for small refrigeration systems, with flow diagram.
ImprovedWebsite: Regulations reviewed for more countries in all tools, e.g. Australia, New Zealand, Canada, USA, United Kingdom, Switzerland and the Nordic countries, with sources.
FixedDomestic water: References updated to Boverket BFS 2024:8, and DS 439:2024 added.
ImprovedRelief line: Help (?) at the fields in simple mode and corrected references to authorities.
ImprovedProject schedule: Printing on sheets by paper size and zoom, own colours and names in the bars.
ImprovedWebsite: New logo.

Version 28 · 2026-10-15

NewCO2 copper tube: Return line from the gas cooler back to the refrigeration unit, sized for the dense CO2 at the gas cooler outlet.
NewCO2 steel pipe: Return line from the gas cooler back to the refrigeration unit, sized for the dense CO2 at the gas cooler outlet.
FixedWebsite: About us and Privacy policy at the bottom of the home page now lead to the right pages.

Version 27 · 2026-10-14

NewKnowledge base: New knowledge base (Beta): laws and regulations, step-by-step guides and an A–Z glossary.
NewKnowledge base: Interactive troubleshooting: symptom search, a flowchart per symptom and system diagrams for direct expansion, heat pumps and CO2 boosters.
ImprovedWebsite: The logo and site name at the top lead to the home page, and the language picker fits on one line on phones.
ImprovedWebsite: CO2 steel pipe and Project schedule are no longer Beta.
ImprovedRelief line: Default gas temperature 90 °C above the critical pressure (hot gas, safe side).
ImprovedProject schedule: PDF split across readable pages (landscape or portrait) and dependencies with Ctrl-click.

Version 26 · 2026-10-13

ImprovedWebsite: Clearer tool names on the home page.
FixedWebsite: Cookie settings opens the privacy policy when Google's consent message cannot be shown, and the links at the bottom are no longer covered by ads.
ImprovedCO2 copper tube: Help (?) at every field and a discharge line to the gas cooler.
ImprovedRelief line: Simple mode with the fields from the valve data sheet and advanced mode with all settings.
ImprovedHC refrigerants (A3): Help (?) at all menus.
ImprovedProject schedule: Full-width chart, zoom, full screen, fixed time axis and rows that can be dragged between groups.

Version 25 · 2026-10-08

NewWebsite: New pages: About, Contact, Privacy policy and Terms of use, linked from every page.
NewWebsite: Changelog covering all tools.
ImprovedWebsite: Cookie consent is managed with Google's certified consent management platform (IAB TCF 2.2) instead of Cookiebot, and a Cookie settings link is on every page.
ImprovedCO2 copper tube: Help (?) at every menu, insulation in mm or inch, a pressure rating table per size, and the plant room is now called Refrigeration unit.
ImprovedCO2 steel pipe: Help (?) at every menu, a pressure rating table per DN to EN 13480-3, and insulation in mm or inch.
ImprovedHeating & cooling: Help (?) at all menus, fluids in groups, a check of materials against the fluid, and insulation to GEG with a condensation check.
ImprovedDomestic water: New pipe picker with pipe families, filters and search; methods for France (DTU 60.11), Spain (UNE 149201) and Poland (PN-92/B-01706); a warning when cold-water pipe is used for hot water.
ImprovedRelief line: Flammable and toxic refrigerants with safety class, warnings and a hazardous area at the outlet, glide for blends, the lowest gas temperature on throttling, and warnings for carbon steel and press-fit pipe.
ImprovedHFC/HFO refrigerants: Safety standards and rules for more countries.
ImprovedHC refrigerants (A3): Safety standards for more countries.
ImprovedGWP and CO2e: Hong Kong and Singapore as separate regulations, Puerto Rico under the USA, and national HFC rules for other countries.
ImprovedRefrigerant retrofit: Country selection with Singapore, South Africa, Chile and the rest of Latin America.
NewProject schedule: New project schedule tool (Gantt) with drag and drop, ISO weeks and dependencies.
ImprovedWebsite: The Beta label has been removed from Relief line, HFC/HFO refrigerants and Refrigerant retrofit.

Version 24 · 2026-10-06

ImprovedWebsite: The language picker shows the country next to the language.
ImprovedWebsite: The home page title and description cover all tools.
FixedWebsite: The privacy policy states exactly which cookies are used.

Version 23 · 2026-10-06

NewRefrigerant retrofit: New refrigerant retrofit tool: compares alternatives with the existing unit and sorts them by suitability or GWP.
NewHC refrigerants (A3): New pipe sizing tool for flammable HC refrigerants (A3), with the refrigerant charge checked against the limits of EN 378-1.
ImprovedGWP and CO2e: Explanations of GWP and CO2 equivalent in the FAQ and the comparison.
ImprovedWebsite: The home page and the sitemap cover all tools.

Version 22 · 2026-10-02

ImprovedGWP and CO2e: Regulations for more countries, charge limits for flammable refrigerants and ammonia, and sortable alternatives.
ImprovedHFC/HFO refrigerants: Refrigerant charge with a warning for A2L refrigerants to EN 378-1.
ImprovedHFC/HFO refrigerants: Liquid and suction lines can be moved in the diagram, and the spacing between the lines can be adjusted.

Version 21 · 2026-10-02

NewGWP and CO2e: New tool for GWP, ODP and CO2 equivalent with the requirements of the F-gas Regulation (EU) 2024/573.
ImprovedDomestic water: Right-angled connections in the diagram, branches that follow when moved, and a drawing area that grows in every direction.
ImprovedRelief line: The whole common line is drawn even when no valve can be calculated, and the warnings state which setting to change.
ImprovedRelief line: An explanation at every input field.
ImprovedHFC/HFO refrigerants: The diagram shows a complete refrigeration circuit: compressor, condenser, filter drier, sight glass, expansion valve and evaporators in parallel.

Version 20 · 2026-10-01

FixedWebsite: The help box shows one scroll bar instead of two.