CIRCULATING PUMPS
Circulation pumps are used in domestic hot water systems, where they ensure constant circulation of hot water between the storage tank and the draw-off points. The operation of a circulation pump allows for immediate access to hot water, eliminating losses resulting from system cooling.
Two main types of circulating pumps:
- stainless steel or brass pump are used for domestic/drinking hot water distribution in open system
- cast iron pump are used for hot water distribution in closed central heating system
Central Heating Pumps are powered by electricity, and they work in conjunction with the boiler, zone valves and thermostats to provide heat for your home. When the thermostat indicates that heat is required, the zone valve is opened, the Central Heating Pump is activated and hot water is circulated through the hot water heating system.Central heating pumps are used to move fluid in hydronic heating systems and solar systems, or in recirculation lines of drinking or sanitary water. With regard to the nature of their constant operation, their power consumption is an important aspect when choosing one. A high efficiency pump may save as much as 80% of power consumption against non-regulated pumps.
Click here for more ...
The selection of a circulating pump should be preceded by an analysis of factors such as the head, water flow rate, and the circulating pump parameters. Circulating pumps are selected based on the heat source's power, the length of the system, and the building's thermal demand. A properly selected circulating pump ensures stable circulation and eliminates the risk of malfunctions.
As the water cools the boiler turns on and reheats the water in the closed loop hot water heating system. The performance of a Central Heating Pump or Circulator Water Pump is measured by its flow performance. The flow performance is a function of the flow-rate (number of gallons / litres of water that can be pushed through the system per minute), and the head pressure of the Domestic Water Pump.
The head pressure rating of a Central Heating Pump is the maximum vertical height the pump can lift the water. Consequently if you have a large hot water system design that needs to go up two floor levels (e.g. from the basement to the second floor of a home) you will need a Circulator Pump that can support a higher flow performance with a high head pressure.
Bleeding the circulation pump is essential for its proper operation. The presence of air bubbles can damage the impeller and reduce the efficiency of the circulation pump. Therefore, after starting the circulation pump, air must be removed from the entire heating system. The circulation pump turns on automatically once the pump's start-up temperature is reached, and its operation is monitored by temperature sensors and a controller.
Every circulation pump should be protected with a strainer and a shut-off valve to facilitate servicing.
Troubleshooting:
