AC Service Tech LLC HVAC Quick Reference Cards — 3-card set, pocket-sized weather-resistant charging & troubleshooting guide

AC Service Tech LLC HVAC Quick Reference Cards are a set of three durable double-sided polystyrene cards that give technicians fast refrigerant charging, measurement, and troubleshooting data on the job.

These pocket-sized HVAC reference cards collect essential charging and diagnostic tables — subcooling, superheat, delta T, P/T data, refrigerant weight per foot, and blend-saturation guidance — into a weather-resistant format designed for field use. The cards are built for quick lookups during service of air conditioners and heat pumps, helping you evaluate refrigerant charge and heat transfer without fumbling through phone apps or bulky manuals.

How do these cards help determine if a system is correctly charged?

The cards provide both target subcooling and target superheat tables so you can compare measured values to recommended targets based on metering device type. By following the correct table for TXV or fixed-orifice systems, you can quickly identify undercharge, proper charge, or overcharge conditions.

• Target Subcooling table for TXV-equipped systems
• Target Superheat and Total Superheat tables for fixed orifice systems
• Simple comparison method—measure, reference, and interpret on the spot

What diagnostic data is included for heat transfer and performance checks?

Built-in Delta T guidance and quick P/T charts let you verify whether the system is exchanging heat correctly and if refrigerant pressures match expected saturated temperatures. This helps isolate cases of insufficient airflow, fouled coils, or charge-related issues.

• Delta T reference to evaluate evaporator/condenser temperature differences
• P/T chart for five common refrigerants showing saturated temperatures
• Blend refrigerant bubble/dew point guidance for mixed refrigerants

Can these cards assist with charging by weight and field-service weighing?

Yes — the set includes a refrigerant weight-per-foot chart and a brief weighing procedure so you can calculate refrigerant needed for tubing runs and add full or partial charges accurately to a vacuumed system. The weight chart speeds line-length calculations without needing separate references.

• Refrigerant weight per foot table for multiple refrigerants
• Step-by-step weighing guide for full or partial charges
• Quick conversion notes reduce calculation errors on site

How durable and field-ready are these cards for everyday HVAC service?

Manufactured from polystyrene and tested for extremes between 0°F and 130°F, the cards resist bending, weather, and UV exposure so they stay legible in harsh conditions. Their flexible, double-sided layout keeps three essential reference surfaces in a compact pack that fits in a tool pouch or glove compartment.

• Polystyrene material tested for 0°F–130°F service conditions
• Weather and UV resistant for outdoor and rooftop use
• Three double-sided cards offer broad coverage while staying compact

Who is this for? HVAC technicians, service contractors, and advanced DIYers working on air conditioners and heat pumps who need fast, reliable refrigerant and diagnostic data in the field will benefit from these cards. They’re made for pros who value speed and accuracy during troubleshooting, charging, and heat-exchange checks, and for trainers who want a durable reference for apprentices. These cards do not replace service manuals or manufacturer-specific procedures but act as a practical, portable supplement to streamline on-site decision making.