Once the installation is complete, the system should be commissioned. If instructions are provided by the manufacturer, they must be followed; otherwise, testing and commissioning must comply with the Section 6.3 of CSA Standard C273.5-11 with consideration to the following:25
- Confirm that all control settings are done as per manufacturer's specifications taking the economic cut-off and thermal balance point setting into consideration..
- Check all control and electrical wiring connections before starting the system.
- Clean all ductwork (where requested by homeowners), accessories, and existing air handlers and install a clean filter as per design before start-up.
- At a minimum, the following operational checks and measurements should be completed:
- Refrigerant charge: Refrigerant charge evaluation relies on measurement of operating pressures and comparison to pressures specified by the manufacturer. The specified pressures correspond to measured ambient (and perhaps indoor) temperatures. Record refrigerant line set length and any adjustments thereof. Sometimes, the outdoor unit might be improperly charged, which can be checked by measuring the operating pressures. Use the method approved and specifically stated by the manufacturer to measure operating pressure and ensure proper refrigerant charge.
- Airflow: The airflow across indoor coils shall be as per manufacturer's specifications. Take airflow readings when the system is believed to be in full heating capacity flow. For multiple-stage systems, it may be necessary to test in partial capacity depending on various factors. For major renovations with newly designed and installed central ductwork, the airflow to individual rooms should be balanced to the designed duct system flow.
- Power inputs: Power inputs of the circulating fan motor and compressor motor should be as per manufacturer's specification. Ensure that all electrical components are operating below their maximum amperage rating (RLA).