1. Connect the cold water inlet of the water heater with the top of the hot water circulation system through bellows. Remember to wind the original tape when connecting the bellows at the cold water inlet of the gas water heater. Remember to reinforce the external wire with silicone gasket at the bellows joint above the hot water circulation, and tighten it with a wrench.

2. Use a tee at the backwater angle valve and the cold water angle valve. The tee is marked with the direction in which the backwater angle valve flows to the cold water angle valve. The other end of the tee is connected with the water flow sensor, the corrugated pipe and the lower end of the hot water circulation system, and the other end of the water flow sensor is connected with the black induction joint at the bottom of the hot water circulation system.

Extended data

main application

1. (The water heater is equipped with temperature control) There are several ways to start the domestic hot water reflux device:

(1) is a remote controller using domestic hot water reflux device;

(2) by switching the faucet;

(3) Use the water heater temperature control switch.

2, and the best effect is to use manual: that is, turn off the faucet. In short, whether return pipe is laid or not, you must tell the domestic hot water backwater device a backwater signal before using the water heater (this time may be about two to three minutes).

(1) If the return pipe is installed. At this point, the water pump of the domestic hot water return device starts to work. It pumps the remaining cold water from the hot water pipe to the return pipe and then flows into the cold water pipe. In this way, hot water will come out of the water heater when taking a bath.

(2) If return pipe is not installed. A one-way angle valve must be installed under the washbasin farthest from the water heater. When the domestic hot water backwater device receives the backwater signal and starts to work, the original residual cold water in the hot water pipe is directly pumped into the cold water pipe through the one-way angle valve, so that the hot water can come out directly in the shower.

Solar hot water should be installed in residential buildings below 12 floor.

1, the "Measures" clarify that government-invested construction projects such as office buildings, schools, hospitals and affordable housing, public buildings with a single investment of more than 5,000 square meters and residential projects with a total investment of more than 654.38+10,000 square meters should be planned, constructed and managed in accordance with green building standards. The planning, construction and operation management of new buildings in Xiangjiang New District and High-speed Railway New Town in Hunan Province should be in accordance with the green building standard 100%.

2. Projects located in ecologically sensitive areas, core landscape areas and with obvious location advantages and outstanding economic or social value shall be planned, constructed and managed in accordance with the green building standards of two or more stars. Encourage other buildings to plan, construct and operate according to green building standards.

3. The Measures stipulate that for government-invested projects and large public buildings with an area of over 20,000 square meters, the construction unit shall select/kloc-0 or more renewable energy sources suitable for this project, and have a certain application scale. Newly built, rebuilt, expanded 12 floors and below residential buildings shall be uniformly designed and installed with solar hot water systems. Renewable energy application facilities shall be designed, constructed and accepted simultaneously with the main building project. Encourage the application of renewable energy in other new civil buildings and existing building renovation projects.

4. At the same time, office buildings of state organs with a building area of over 3,000 square meters and newly-built public buildings with a building area of over 654.38+0,000 square meters shall be equipped with an energy consumption monitoring data acquisition system, which shall be designed, constructed and accepted synchronously with the main building project, and the collected building energy consumption data shall be stably uploaded to the building energy consumption monitoring platform of our city.

Community construction should meet the requirements of sponge city construction.

1, the Measures require that the construction of residential areas should meet the requirements of sponge city construction, and reasonably set up green rainwater infrastructure, including rainwater gardens, recessed green spaces, roof greening, shallow vegetation ditches, rainwater interception facilities, rainwater ponds, rainwater wetlands, landscape water bodies, and multifunctional storage facilities. Non-traditional water sources, such as rainwater and reclaimed water, are used for landscape water, greening water and road washing water of newly-built buildings, and rainwater and sewage diversion technology is adopted for the construction of site drainage pipe network.

2, new buildings should vigorously promote the application of green building materials, and steadily increase the proportion of green building materials in new buildings. Promote the use of new wall materials, high-strength steel bars, high-performance energy-saving doors and windows, complete sets of fittings and technologies for residential industrialization, high-performance concrete, external thermal insulation products (systems) and integrated thermal insulation and decoration products (systems). The horizontal cross-sectional area of external thermal insulation materials for building exterior walls is not included in the floor area ratio. Encourage the use of recycled building materials.

3. In addition, Changsha will establish a promotion system for building energy-saving and green building demonstration projects. The projects listed in the demonstration project library will be awarded the title of "Changsha Building Energy-saving or Green Building Demonstration Project" and enjoy financial rewards or fixed subsidies in accordance with relevant regulations.

References:

Baidu encyclopedia-domestic hot water backwater device

References:

People's Daily Online-Changsha explicitly requires that the residential buildings below 12 floors should be equipped with solar hot water systems.