Yes, a 240V volt dryer should work on a 220V power supply. The voltage difference of 20V is within the acceptable range for most electrical appliances. Generally, electrical devices are designed to handle small variations in voltage. In this case, the 220V power supply should be sufficient to operate the dryer effectively. However, it's always a good idea to consult the dryer's user manual or contact the manufacturer to confirm compatibility and ensure safe operation.