CASCADE SYSTEM FOR CONTROLLING NUMBERS OF STANDBY BOILER OR GAS WATER HEATER AND METHOD OF THE SYSTEM

摘要

The present invention relates to a cascade system for controlling standby unit numbers and a control method for the same. A cascade control unit determines that water amount is detected in a cascade system using a water amount sensor when a boiler or water heaters are set in an automatic standby mode. After a water amount safety time passes, the cascade system calculates whole water amount detected by the water amount sensor and calculates Y based on the whole water amount and an operation water amount calculated in the boiler or the water heaters. The cascade system determines whether formula (1) Z = Y = X is satisfied, wherein Z is a maximum standby number of the boiler or the water heater, Y is a requested standby number of the boiler or the water heater, and X is a setting standby number of the boiler or the water heater. When the condition of the formula (1) is not satisfied, the X is renewed. The cascade system can provide optimal hot water or heating for a user and also provides convenience for managing a system for a manager managing the cascade system.