Refrigerant Charge Verification by Subcool and Superheat

Inspection template for verifying HVAC refrigerant charge using subcooling on TXV systems and superheat on fixed-orifice systems, aligned to ACCA Standard 5 quality installation procedures.

Inspection Setup and System Identification

• Equipment model, serial number, and location recorded
• Refrigerant type verified against nameplate and service data
• Metering device identified as TXV/EEV or fixed orifice
• System has operated long enough to reach stable conditions before measurement
• Outdoor and indoor ambient conditions recorded
• Manufacturer charging data or service chart available on site

Operating Conditions and Measurement Readiness

• Cooling mode confirmed for charge verification
• Indoor airflow and filters are in acceptable condition for measurement
• Suction line, liquid line, and service ports accessible for measurement
• Temperature clamps and pressure gauges calibrated or verified
• Measurement instruments zeroed and attached without leaks

TXV / EEV Systems - Subcooling Verification

• System identified as TXV/EEV controlled
• Liquid line temperature measured
• Liquid line pressure measured
• Calculated subcooling recorded
• Measured subcooling matches manufacturer target within acceptable tolerance
• Superheat not used as the primary charge verification method for this TXV/EEV system

Fixed Orifice Systems - Superheat Verification

• System identified as fixed orifice / piston / cap tube controlled
• Suction line temperature measured
• Suction pressure measured
• Calculated superheat recorded
• Measured superheat matches manufacturer target within acceptable tolerance

Final Verification and Corrective Actions

• Charge verification result accepted or rejected
• Deficiencies or non-conformances documented
• Corrective action completed or assigned
• Inspector signature captured