Peter's HVAC Advisory

R-32 Diagnostic Tool

• Bug fixes & changes

View R-32 NRE Explanation

R-32 Diagnostic Tool

All calculations use PSIA • Most gauges read PSIG (14.7 psi atmospheric)

Loading R-32 thermodynamic data...

Quick Load Realistic Calgary Scenarios

Suction Pressure
Suction Line Temp (°F)
Liquid Pressure
Liquid Line Temp (°F)
System Capacity (tons) — optional
Discharge Line Temp (°F) — optional
Return Air Wet Bulb (°F) — optional
Return Air Dry Bulb (°F) — optional
Ambient Condition

Session History & Running Average (0)

No diagnostics run yet.

Important Notes for R-32

Pure fluid — zero temperature glide.
Higher efficiency and significantly lower charge than R-410A.
A2L mildly flammable — special handling, ventilation, and leak detection required.
GWP = 675 (much lower than R-410A).
Requires POE oil. Good for new equipment designs.

References & Data Sources

NIST Chemistry WebBook – R-32 Thermophysical Properties: https://webbook.nist.gov/chemistry/fluid/ (select R-32)
THE LINDE GROUP / NIST REFPROP R-32 Thermodynamic Properties
Lemmon, E.W., Huber, M.L., McLinden, M.O. NIST Standard Reference Database 23: REFPROP, Version 10.0
ASHRAE Handbook – Fundamentals (2021)
Typical operation in ASHRAE Climate Zone 7 (Calgary region)

R-32 PT Chart

Temperature (°F)	Liquid psig	Vapor psig

Liquid (Bubble Point) & Vapor (Dew Point) • Zero glide (pure fluid)
Typical field gauges for R-32: suction ~100–140 psig, liquid 300–450 psig depending on conditions.