{"product_id":"ac-service-tech-llc-hvac-quick-reference-cards-3-durable-polystyrene-cards-for-refrigerant-charging-superheat-subcooling-delt","title":"AC Service Tech LLC HVAC Quick Reference Cards — 3 Durable Polystyrene Cards for Refrigerant Charging, Superheat\/Subcooling \u0026 Delt","description":"\u003cp\u003e\u003cstrong\u003eThree double-sided polystyrene HVAC quick-reference cards that let technicians quickly determine target subcooling, target superheat, delta T, refrigerant P\/T values, and charging weights for common refrigerants.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThese compact HVAC Quick Reference Cards from AC Service Tech LLC condense the most-used field calculations and charts into three durable, pocket-sized polystyrene cards. Designed for service technicians working on air conditioners and heat pumps, the set helps you assess refrigerant charge, troubleshoot cooling performance, and weigh refrigerant accurately without flipping through manuals or apps. Each card is double-sided and engineered to withstand jobsite conditions, from cold startups to sunny rooftops.\u003c\/p\u003e\n\n\u003ch3\u003eHow do these cards tell me if a system is charged correctly?\u003c\/h3\u003e\n\n\u003cp\u003eThe cards present both target subcooling (for TXV\/expansion valve systems) and target superheat (for fixed-orifice systems), plus total superheat guidance so you can compare calculated values to manufacturer expectations. By measuring suction and liquid line temperatures and pressures, a technician can quickly decide whether a system is undercharged, correctly charged, or overcharged.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eTarget Subcooling table for TXV-equipped systems\u003c\/li\u003e\n  \u003cli\u003eTarget Superheat chart for fixed-orifice systems\u003c\/li\u003e\n  \u003cli\u003eTotal Superheat guide for field verification\u003c\/li\u003e\n  \u003cli\u003eQuick checks to distinguish undercharge vs. overcharge scenarios\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat measurements do I need to use the charging and troubleshooting guides?\u003c\/h3\u003e\n\n\u003cp\u003eUse common field readings: liquid-line temperature, suction-line temperature, and gauge pressures. The cards include a P\/T (pressure-temperature) chart for five common refrigerants, plus instructions to find bubble and dew saturated temperatures for blends. Combine the temperature readings with the P\/T chart and the card’s formulas to determine target superheat\/subcooling and whether to add or remove refrigerant.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eLiquid and suction line temps for superheat\/subcooling\u003c\/li\u003e\n  \u003cli\u003eGauge pressures matched to P\/T chart for refrigerant saturation temps\u003c\/li\u003e\n  \u003cli\u003eInstructions for blend refrigerant bubble\/dew point lookup\u003c\/li\u003e\n  \u003cli\u003eStep-by-step weighing guidance for full or partial charges\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do these cards help with heat transfer and system performance checks?\u003c\/h3\u003e\n\n\u003cp\u003eThe cards include a Delta T reference so you can verify the system’s air-side heat transfer is within expected ranges. Measuring the temperature drop across the evaporator and comparing it to the card’s suggested Delta T range points toward airflow or coil issues rather than refrigerant problems, helping you narrow diagnostics faster.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eDelta T chart for quick evaporator performance checks\u003c\/li\u003e\n  \u003cli\u003eGuidance to separate airflow issues from refrigerant faults\u003c\/li\u003e\n  \u003cli\u003eTroubleshooting prompts based on measured temperature splits\u003c\/li\u003e\n  \u003cli\u003eCompact format suited to field inspections\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat charging and weighing tools do the cards support on the job?\u003c\/h3\u003e\n\n\u003cp\u003eThe set contains a refrigerant weight-per-foot chart to estimate additional refrigerant needed for line sets and clear instructions to weigh full or partial charges into an evacuated unit. These practical helpers reduce guesswork when adding refrigerant by weight rather than relying only on pressure or time-in methods.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eRefrigerant weight chart per foot of tubing for several refrigerants\u003c\/li\u003e\n  \u003cli\u003eWeigh-in procedure steps for empty, vacuumed systems\u003c\/li\u003e\n  \u003cli\u003eQuick tips for partial-charge calculations and hose-volume considerations\u003c\/li\u003e\n  \u003cli\u003eDurable card material suitable on the tool belt while working\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: HVAC technicians, service contractors, field supervisors, and apprentices who need a fast, reliable reference when charging and diagnosing air conditioners and heat pumps. The three double-sided cards are weather- and UV-resistant, rated for jobsite temperatures from 0°F to 130°F, and offer practical tables and step-by-step prompts to speed up accurate diagnostics and charging on the roof, in basements, or at remote job sites.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFlexible\u003c\/li\u003e\n  \u003cli\u003eWeather and UV Resistant\u003c\/li\u003e\n  \u003cli\u003ePolystyrene Card Material Tested 0°F-130°F\u003c\/li\u003e\n  \u003cli\u003eThree Cards Double Sided per Pack\u003c\/li\u003e\n  \u003cli\u003eHVAC Technician Resource\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can these cards be used for all refrigerants?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: They include a P\/T chart for five common refrigerants and a blend guide; check manufacturer specs for uncommon refrigerants.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Are the cards durable for outdoor jobsite use?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — polystyrene material is flexible, weather- and UV-resistant, rated for 0°F to 130°F.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"AC Service Tech LLC","offers":[{"title":"Default Title","offer_id":55168297763159,"sku":"B082895BBX","price":44.02,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/ac-service-tech-front-view-cards.jpg?v=1790398792","url":"https:\/\/britishgarage.co.uk\/products\/ac-service-tech-llc-hvac-quick-reference-cards-3-durable-polystyrene-cards-for-refrigerant-charging-superheat-subcooling-delt","provider":"British Garage","version":"1.0","type":"link"}