RTU First Start-up Sequence
- Interactive decision labs
- Built by working technicians
- Path-based verifiable certificate
- Exam preparation only
- Worldwide online
Installation, Start-up & Commissioning
~14 min
intermediate
The call
New packaged RTU has been set on the curb. Electrical and duct connections are complete. You are called to perform first start-up and basic verification before handover.
- Equipment
- 6-ton gas/electric packaged RTU, R-410A, economizer equipped, newly installed
- Ambient
- 82°F
- Site notes
- Install crew reports power is on and thermostat is wired. No previous start-up has been performed. Condensate drain is connected.
Decision 1 of 4
The unit is set, wired and ducted. Nothing has been run yet and no readings exist.
What is the correct first action before energising the unit for start-up?
Where this lab sits
This is one module lab from Installation, Start-up & Commissioning. The full path adds sealed systems, defrost, rack-system orientation and natural-refrigerant safety, each ending in a lab like this one.
Open the full pathNext lab: Residential No-Cool — Split System Not CoolingNext lab: Residential No-Heat — Gas Furnace Short Cycling on IgnitionNext lab: Frozen Coil / Airflow RestrictionNext lab: Superheat / Subcooling DecisionNext lab: Walk-in Cooler Not Holding TemperatureNext lab: Ice Machine Not Making IceNext lab: Reach-in / Prep Table Not Holding TemperatureNext lab: Walk-in Freezer Defrost FaultNext lab: Natural Refrigerant Safe-Handling DecisionNext lab: Rooftop Unit Not CoolingNext lab: RTU Economizer Stuck — No Free CoolingNext lab: RTU High Static — Low Airflow and Poor CoolingNext lab: RTU Gas Heat — No Heat / Ignition Fault