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Workbook-driven HVAC field diagnostics

HVAC Deep Dive
Diagnostics

Enter verified readings, compare them with workbook and OEM targets, and identify the next measurement that matters.

✓Editable field measurements✓OEM-first target comparisons✓Evidence-weighted results
Run Diagnostics ›
01 / MEASURE

Enter only verified readings.

Line and compressor operating frequency default to 60 Hz and remain editable. Every other measurement starts blank.

Use measured, trusted values from your gauges, meter, and instruments.
The calculator follows OEM-first logic and workbook diagnostic methodology.

JOB SYSTEMS

Active HVAC system

Each system keeps its own readings, equipment, nameplate photos, OCR confirmations, search results, and OEM sources.

Job information

SOURCE-VERIFIED EQUIPMENT DATA

Automatic OEM Lookup

Each equipment search uses its own manufacturer and complete confirmed model number. The verified cache is checked first, followed by manufacturer documentation. General internet search is secondary; search results never serve as specification evidence.

OEM data reviewField-level value, source, match, status and action
01Equipment Identification & ManualsIndependent manufacturer, model, serial and nameplate OCR

Condenser

Manual / OEM Search

Air Handler / Coil

Manual / OEM Search

Furnace

Manual / OEM Search

Thermostat

Manual / OEM Search

Thermostat manuals are informational and never overwrite HVAC equipment targets.

Nameplate photos are processed locally. OCR values remain editable plate candidates until confirmed, and are not OEM verified without applicable manufacturer documentation.

02System & operating conditionsConfiguration, load and verification
Always verify firstFrom the workbook diagnostic page
02Airside & psychrometricsWorkbook readings 1–9
Static pressureUse positive magnitudes for return and supply
AirflowBook value and direct measurement are kept separate
Temperature, moisture & enthalpyDirect enthalpy overrides calculated enthalpy
Space air changesOptional room turnover calculation
03Duct capacity countLive friction-rate screening
03Room Air Changes / CFM CalculatorResidential supply-air screening
06Post-repair validationBefore / after proof of correction
Close the loop. Enter only stabilized post-repair readings. The report compares them with the original readings and the same OEM-first targets.
Post-repair airsideStabilized paired measurements
Post-repair refrigerationDew / bubble PT values calculate automatically
04Refrigerant circuitWorkbook readings 11–22
Bidirectional refrigerant PT. Select the refrigerant, then enter either pressure or saturation temperature. The last field edited controls the pair. Suction uses dew point; liquid uses bubble point.
Pressure & saturationPressures are gauge pressure
Diagnostic targetsWorkbook suggestions remain technician-editable
Charge-readiness gateSpecific charge calls stay gated until complete
05Electrical & capacitorsWorkbook motor and capacitor checks
Compressor / motor loadingOperating conditions materially affect current

Three-phase voltage balance

Enter all three line-to-line readings
Fan capacitor live testµF calculation adjusts for entered frequency
Compressor capacitor live testUse capacitor nameplate tolerance to judge
EQUIPMENT PROFILE

Saved unit and OEM targets

Profiles are stored only in this browser. A loaded OEM target has priority over a generic workbook target; any technician edit becomes the final override.

0 readings enteredFaults require multiple agreeing measurements. Missing or conflicting evidence lowers confidence automatically.
02 / INTERPRET

Diagnostic report

Run the calculator to generate an evidence-weighted field report.

No measurements analyzed yet.

Calculations, ranked fault fits, contradictions, and priority readings will appear here.

FIELD SOURCE

Manufacturer value
EXISTING EQUIPMENT DATA FOUND

Confirm which value to use
CONFIRM CLEAR

Clear this section?

Only the current active diagnostic is affected. Saved reports and verified equipment cache records are preserved.
CITY CHANGED

Update Barometric Pressure?
AUTHORIZED ADMINISTRATION

Equipment Data Administration

Candidate values are never trusted until a person validates model coverage and selects the exact values supported by the OEM document.

Verify an OEM document

Truth-first verification. Parsing only proposes candidates. Open the source, confirm the entered model is explicitly covered, then select only values you verified.
UseFieldValueUnitPage
Upload a PDF or add a verified row.
Stage / frequency capacity data

Add a verified value row with field “OEM stage/frequency capacity point (JSON)”. Enter one published point per row with keys: mode, stage, frequency (Hz if applicable), value, unit, and conditions (named input/value pairs such as outdoorDb, returnDb, returnWb). Record its page and document. Only exact stage, frequency and condition matches are used; no linear frequency scaling or extrapolation is performed.

OEM blower table optionalOne row per line: ESP, CFM, blower setting, motor setting, profile, configuration, mode

Verified equipment cache

ManufacturerModelMatchVerifiedRevalidateAction
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Lookup history

TimeManufacturerModelCacheMatchFallback
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Manufacturer adapters and connectors