TL;DR
Dirty condenser coils raise head pressure and increase compressor work. A 10% reduction in condenser airflow adds roughly 5% to energy consumption. Clean coils at least annually.
What you might see
- high discharge pressure compared to prior season
- compressor running longer than expected for cooling load
- visible debris or scale on condenser fins
- energy bill higher with no load change
Likely causes
Condenser coil fins blocked with cottonwood, dirt, or pollen, restricting airflow and raising head pressure
Evaporator coil blocked by dust, fibers, or ice reducing heat exchange on the cooling side
Bent condenser fins reducing effective face area, compounding the restriction
Dirty air filter restricting evaporator airflow, reducing system efficiency
Required tools
- Low-pressure garden hose or coil cleaning sprayer
- Non-acid coil cleaner
- Fin comb (correct pitch for the Voyager coil)
- Replacement air filter
- LOTO kit
Safety first
- Lock out the unit before removing access panels. The condenser fan can start automatically.
- Coil cleaners are caustic. Wear chemical-resistant gloves and safety glasses.
- Rooftop work requires fall protection.
Procedure
- 1
Lock out the unit at the disconnect.
- 2
Remove the condenser fan section access panel and inspect the condenser coil face for debris. A heavy layer of cottonwood, soil, or organic material is the most common finding.[1]
- 3
Clean the condenser coil with low-pressure water spray from inside out (reverse direction to normal airflow) to push debris clear.[1]
- 4
If water alone is insufficient, apply a non-acid coil cleaner per the product instructions. Rinse thoroughly.
- 5
Straighten bent fins with a fin comb rated for the coil fin pitch. Do not use metal tools that can cut the coil tube.
- 6
Inspect and replace the evaporator air filter. Replace when pressure drop across the filter exceeds the Trane recommended value.
- 7
After cleaning, record the discharge pressure at a known ambient temperature. This becomes the new baseline for tracking future coil fouling.
Sources
Trane Voyager Commercial Rooftop Service Literature, Trane (Trane Technologies)
Trane Voyager Commercial Rooftop IOM, coil cleaning and maintenance procedures (general)
View source
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