HVAC Field Assistant

Find a model

Search all manufacturers

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ManufacturerEquipment typeModel

Catalog coverage

18Manufacturers listed

0Verified model entries

This is a verified starter catalog, not every model ever manufactured. Brands without verified entries are clearly marked. No user-entered equipment records are required.

Serial number (optional, not saved)

A serial number does not automatically verify a document revision. Confirm applicable serial ranges and control version against the manufacturer's published documentation.

Manuals and technical documents

Diagnostics and error codes

Offline manufacturer packs

Packs contain the verified catalog entries and any supported PDFs you explicitly download. Website-only manuals cannot be automatically stored as PDFs.

Manufacturer

On iPhone, cross-site PDF downloads may be blocked by publisher access rules or browser storage restrictions. Failed downloads are never marked offline. iOS may also evict cached documents when storage is low.

About this version

Technical Lookup v4. Universal search, manufacturer browsing, model-specific document references, and honest offline-download status.

The app shell and bundled catalog work offline after first successful load. Manufacturer websites require internet. Only successfully cached PDFs are shown as offline-ready.

Manufacturer manuals remain the authoritative source. Verify fuel type, model suffix, serial range, control revision and local safety requirements before servicing equipment.

Existing records from earlier versions are not deleted, but they are no longer part of the lookup workflow.

Field calculators

Offline tools. Select a calculator; calculations are estimates unless otherwise stated. Confirm design values and code requirements.

Calculator

Enter inputs to calculate.

Code references

Official standards are copyrighted and may require licensed access. These links need internet; full NFPA books are not included offline.

NFPA 54 — National Fuel Gas Code

Fuel-gas installation, piping, combustion air and appliance requirements. Confirm adopted edition and local amendments.

Official NFPA 54

NFPA 58 — Liquefied Petroleum Gas Code

LP-Gas storage, handling, piping and system requirements. Verify edition, jurisdiction and equipment instructions.

Official NFPA 58

Gas pipe sizing requires the applicable table, gas composition, material, pressure, allowable drop, and developed/equivalent length. The worksheet computes demand and records inputs; it does not claim a code-compliant pipe diameter.