HVAC refrigerant diagnostic training
Refrigerant Diagnostic Workbench
Read the system. Prove the diagnosis.
A five-PDF diagnostic system for residential split air conditioners and heat pumps. Work through airflow, operating mode, pressure, temperature, electrical evidence and final verification without guessing at the charge.
- 18 residential diagnostic scenarios with a separate answer key
- Field workbook and nine-page truck reference pack
- R-22, R-410A, R-32 and R-454B coverage
- Lifetime downloadable updates for this product family
Lifetime access
30 days of Pro included. No automatic subscription.
Version 1.0.0 | 2026 Field Edition
Five PDFs. Each one has a job.
Use the complete edition when you want everything in one file. Open the focused PDFs when you need a worksheet, scenario set or reference page without digging.
- 01
Complete Workbench
PDF | 62 pagesThe full handbook with field worksheets, scenario practice, the answer key and truck references in one file.
- 02
Field Workbook
PDF | 10 pagesPrint-ready forms for equipment identity, operating conditions, airflow, refrigerant measurements, electrical evidence and final verification.
- 03
Scenario Lab
PDF | 21 pagesEighteen residential service records that make you identify the next safe check and defend the fault family from the evidence.
- 04
Scenario Answer Key
PDF | 12 pagesA separate answer key for checking your work after the scenario lab. Answer content stays out of the public previews.
- 05
Truck Reference Pack
PDF | 9 pagesFocused reference pages for diagnostic sequence, safety, formulas, measurements, conversions and closeout.
START-HERE.txt | LICENSE.txt | manifest.json
Airflow Before Charge
Verify indoor airflow, total external static pressure where applicable, filter and coil condition, blower operation and basic operating conditions before making a refrigerant-charge diagnosis or adjustment.
Complete the noninvasive airflow and basic operating-condition checks before attaching gauges. If gauges are required, purge the gauge lines and follow the equipment procedure.
Safety and manufacturer boundaries
Manufacturer service data governs targets, limits, procedures and approved tools for the exact equipment. Workbench calculations are examples, not universal targets.
Follow current law, code, employer policy and refrigerant-specific safety instructions. Stop work when the equipment identity or safe procedure is unclear.
- Control ignition sources
- Maintain ventilation
- Respond to suspected or confirmed leaks
- Use approved A2L service tools and recovery equipment
The diagnostic order stays consistent
The handbook, workbook and scenarios use the same order so the process can move from study to a service record without changing the rules halfway through.
- 01
Set up the call safely
- Equipment identity and approved match
- Operating mode and steady-state conditions
- A2L work-zone controls
- 02
Verify airflow first
- Filter, coil and blower condition
- Total external static pressure where applicable
- Airflow Before Charge
- 03
Measure with a reason
- Superheat and subcooling
- Fixed-orifice and TXV charging logic
- Pressure, temperature and electrical evidence
- 04
Separate the fault families
- Residential split cooling
- Heat-pump cooling and heating mode
- Restrictions, airflow faults and system interactions
- 05
Correct and verify
- Manufacturer targets and approved procedures
- Final readings and documentation
- Formulas, measurements and conversions
Residential splits and heat pumps
The package stays inside the declared equipment scope. It covers cooling, heating and the operating-mode interactions that change how the evidence reads.
- Residential split air conditioners
- Heat-pump cooling
- Heat-pump heating mode
Four refrigerants. The handling rules stay specific.
Legacy residential equipment context, current manufacturer data and recovery without intentional venting.
High-pressure equipment context, liquid removal from the cylinder and dew-point or bubble-point use.
Equipment must be designed and labeled for R-32. A2L work-zone controls and approved tools apply.
New equipment designed and labeled for R-454B, with A2L controls and blend-handling boundaries.
Pages from the approved release
Four real pages from the version 1.0.0 PDFs. Answer-key content is not shown.
Lifetime downloadable updates
Product ownership permanently grants access to the newest approved Workbench download.
This applies only to this downloadable product family. It does not promise future apps, physical editions, courses, memberships, classroom licenses or unrelated products.
One nonrenewing 30-day Pro bonus
Each paid Workbench ownership can issue one nonrepeatable 30-day Pro extension.
The bonus does not automatically begin a paid subscription. Workbench ownership remains permanent after Pro expires.
Single-user license
The included license covers one purchaser, personal devices, personal printing and completed worksheets used in that purchaser’s own service work.
Who this is for
Students and apprentices
Build a repeatable diagnostic order before field pressure makes guessing feel faster.
Residential service technicians
Use the worksheets and reference pages to keep evidence, corrections and final readings tied to the same call.
Lifetime access
30 days of Pro included. No automatic subscription.
Frequently asked questions
How do I receive the Workbench?
After checkout, the Workbench is added to your account. Sign in and download the newest approved package whenever you need it.
Can I print the worksheets and reference pages?
Yes. The single-user license allows personal printing for your own study and field use. It does not cover classroom distribution or sharing across a company.
Does it cover heat-pump heating mode?
Yes. The handbook and scenario set cover residential heat-pump cooling, heating and defrost interactions.
Does the Pro bonus become a subscription?
No. It is one nonrepeatable 30-day Pro extension. It does not automatically begin a paid subscription.
Does this replace manufacturer service data?
No. Manufacturer service data governs the targets, limits, procedures and approved tools for the exact equipment.