Drolet GTX-I manual Altitude adjustment

3.3.7 Altitude adjustment

All valves have been pre-set and certified for installation at elevations from 0 – 4500 feet (1 – 1372m) above sea level.

When installing this heater at higher elevations, it is necessary to decrease the input rating by replacing the existing burner orifice with a smaller size for installations over 4500 feet (1372m). The appliances input should be reduced 4% for each additional 1000 feet (305m) above sea level. For the USA, de-rate the heater from sea level according to the gas installation code.

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