System and method to reduce standby energy loss in a gas burning appliance and components for use therewith
A system to reduce standby losses in a hot water heater is presented. The system utilizes a dual safety relay valve between the combination gas controller and the burner. The dual safety relay valve bypasses gas to a rotary damper actuator valve to position a damper flapper valve located over/inside the flue pipe. Once the flapper valve has opened to ensure combustion, the gas is allowed to flow back to the dual safety relay valve. Some of the bypass gas may be diverted to boost the pilot or to supply a booster. The dual safety relay valve is then opened to allow the gas supply to the burner. Once the burner is turned off, bypass gas bleeds out of the rotary damper actuator valve to close the damper flapper valve to reduce standby losses through the flue pipe, and to allow the dual safety relay valve to close tightly.
1. A dual safety relay valve, comprising: a housing having an inlet for receiving gas and an outlet for discharging gas received at the inlet; a first and a second main controlling valves positioned in series between the inlet and outlet but oriented anti-parallel to one another to control a flow of gas from the inlet to the outlet, the first and the second main controlling valves each including a valve control shaft drivably coupled to a diaphragm positioned in a diaphragm control chamber, wherein each of the valve control shafts is driven by movement of its respective diaphragm, wherein the housing further defines a booster pilot gas connection outlet in fluid communication with at least one diaphragm control chamber, and including a micro pilot supplied with gas by a pilot feed pipe, further comprising a booster pilot positioned in proximity to the micro pilot and the burner and in fluid communication with the booster pilot gas connection.
2. A dual safety relay valve, comprising: a housing having an inlet for receiving gas and an outlet for discharging gas received at the inlet; a first and a second main controlling valves positioned in series between the inlet and outlet but oriented anti-parallel to one another to control a flow of gas from the inlet to the outlet, the first and the second main controlling valves each including a valve control shaft drivably coupled to a diaphragm positioned in a diaphragm control chamber, wherein each of the valve control shafts is driven by movement of its respective diaphragm, wherein the housing further defines a first connection port in fluid communication with the inlet and a second connection port in fluid communication with at least one of the diaphragm control chambers, wherein each of the diaphragm control chambers are in fluid communication with the second connection port such that an opening of the first and the second main controlling valves occurs at approximately the same time.