R-410A Diagnostic Tool – Peter's HVAC Advisory

Loading R-410A thermodynamic data...

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

ASHRAE Climate Zone

System Capacity (tons) optional

Discharge (°F) optional

For refrigerant diagnostic — complete set required only when using gauge path

Suction Pressure (PSIG)

Liquid Pressure (PSIG)

Suction Line Temp (°F)

Liquid Line Temp (°F)

Coil performance — complete one group (e.g. Return DB + Evap TD) to run diagnostic without gauges

Return DB (°F)

Ret WB (°F)

Evap TD (°F)

Evap In (°F)

Evap Out (°F)

Cond TD (°F)

ODB (°F)

Cond In (°F)

Cond Out (°F)

Sensible heat, traverse pressure, duct sizing — complete one group to run diagnostic without gauges

BTU/hr

ΔT (°F)

CFM

Static pressure (in. w.c.)

Total pressure (in. w.c.)

Velocity FPM

Duct area (sq.ft.)

BTU = CFM × 1.08 × ΔT • VP = TP − SP • FPM = 4005√VP • CFM = FPM × area

Run diagnostic to see key metrics.

Run diagnostic to see refrigerant readings.

Run diagnostic to see duct airflow results.

Run diagnostic to see air and oil readings.

Run diagnostic to see enthalpy properties.

Run diagnostic to see vapor and performance properties.

NIST Chemistry WebBook – R-410A Thermophysical Properties: NIST Reference (select R-410A)
Chemours / DuPont R-410A Thermodynamic Properties (NIST REFPROP validated)
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)

Run diagnostic to save or download a PDF log.

R-410A PT Chart