Circulator Pump

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Circulator Pump Important Tips

Want to use circulator pumps to circulate cold or hot water in air conditioners or central heating systems of buildings from production tank to heat transfer areas in cooling and heating syst...

Circulator Pump Important Tips

Want to use circulator pumps to circulate cold or hot water in air conditioners or central heating systems of buildings from production tank to heat transfer areas in cooling and heating systems but you are not sure of type, capacity, brand, price, and specifications that suit your purpose? Read on to find the answers to all your questions on price, technical specifications, and the best circulator pumps on the market.

Circulator pumps are tasked with circulating cold or hot water in air conditioning or heating systems from the heating location to the heat exchange locations. Circulator pumps are normally used with lower RPMs in smaller buildings (approx. 1450 RPM).

After the water is heated by the central boiler or cooled by the chiller refrigerator, the resulting hot or cold water is transferred by circulator pumps to heat exchangers (e.g. radiator, fan coil, air conditioner coils).

Water circulator pumps of heating/cooling systems used in small or medium buildings are usually of the linear, floor types with a rotational velocity of 1450 RPM, featuring a lower electrical power compared to similar water pumps. Linear pumps are installed on the pipes via flange or gear fittings. Floor mounted pumps are placed on a proper, level chassis and connected using bolts with rubber shock absorbers.
circulator pump
Circulator pumps are merely used to circulate water in cooling and heating systems and their pipework. Therefore, they are equipped with fans and are not sufficiently powerful to suck water from lower levels as is the case for irrigation and water supply pumps.

Main parameters in selecting a circulator pump

Bear in mind the following

  1. Gear or flange fix
  2. Brand and model of the pump
  3. Power and RPM of the pump motor
  4. The system’s required head and flow rate
  5. Whether the pump is linear or free-standing
  6. The diameter of the inlet and outlet tubes of the circulator pump

The flow rate or the volume of the water circulating at a section of the heating system is obtained via dividing the energy (kcal) by 2500 in order to find the required tube diameter and pump flow rate:

Kcal/2500 = BTU/10,000 = GPM (heating)

Also, dividing the energy of a section of a cooling system by 1250 gives the flow rate (GPM) of that section to obtain the required tube diameter and pump flow rate

Kcal/1250 = BTU/5,000 = GPM (cooling)

The gravitational (natural) flow of water in vertical tubes of the heating/cooling systems is one of the primary determinants of the required head or pressure for the circulator pump, that is, the only task of circulator pumps used in circulating systems is to compensate for the friction pressure drop along the tubes, taps, joints, and coils of the heating/cooling system. Therefore, the required head of these pumps is usually substantially lower than the head required for the water supply pump of the same place, hence allowing the use of low-power electron pumps.

  • By using reverse piping in a small or medium building, the required power for the circulator pump is minimized and water is uniformly distributed in pipes of the heating or cooling system.
  • When calculating the pump head for cooling towers, although part of the water path is open, the gravitational flow in the return of water to the condenser allows using the same method used for circulator pump heads.
    circulator pump

Note: using circulator pumps with a rotational velocity of 2900 RPM or above in small or medium buildings will cause discomfort for residents due to the resulting pump vibration and water flow noise.

Without providing sufficient head or pressure for water by the circulator pump, the cold or hot water cannot pass through the tubes and reach the radiator, fan coil, or other heating or cooling device. With insufficient flow rate by the pump, the water volume in the machine will be inadequate and the heating or cooling device will operate below its actual performance. To prevent such problems, you can contact the sales technicians of Damatajhiz Co. when choosing a circulator pump.

Considering that most buildings of the country have a total area of less than 2000 square meters and determining the type or model of the water circulation pump for the heating system of those buildings does not require complicated calculation, we provide a circulator pump for the heating system for buildings up to 7 floors in the section of the product selection guide of Semnan circulator linear pumps as a general guide based on the relatively popular pump models of Semnan company.
circulator pump

Circulator Pump Installation Site

Circulator pumps are usually installed on the return water path of the circuit of the cooling or heating systems. In other words, they are placed before the central heating boiler in heating systems and before the chiller in cooling systems, so that the water outlet of circulator pumps in cooling systems is entered into the boiler and then distributed in radiators and fan-coils. While the water outlet of circulator pumps in cooling systems is first entered into the evaporator of chiller and then it goes into the fan-coils and coil of the air handling units. In order to return the unused hot water consumption to the hot-water plumbing of the building, it is essential to install a water return pump before the coil or double-glazed resource on the hot-water return pipe.

Usually, a 1-inch linear pump or 1/1.4inch GRUNDFOS, DAB, or WILO is considered as the hot water consumption return pump to the two-glazed or coil resource of the engine room of the building.

circulator pump

Practical Recommendation for Installing Circulator Pump

According to the recommended standards of facilities engineering, it is imperative to consider a “reserve” circulator pump with identical power, head, and flow of the main pump for buildings with 8 units or more.

It is better to separate the performance of the hot-water circulator pump of the building’s heating (or cooling) system with the flow route of the hot-water boiler feeder in coil resource and then consider a separate circulator pump for each route in order to have a better operation in different seasons of the year.

In general, the off-on command for the operation of the circulator pumps is performed by the parietal thermostat mounted on the water return pipe of the heating (cooling) system.

The temperature of the parietal thermostat mounted on the suction pipeline of the circulator pump should be about 5 ° C less than the defined temperature of the submersible thermostat of the hot-water boiler of the building’s engine room.

It is essential to install a strainer in the suction pipe of all pumps and a vibration dampener in the inlet and outlet pipe of the ground circulator pumps.

  • Diagram of the installation of the linear pump of the circulator

circulator pump

  • Diagram of the installation of the ground pump of the circulator

circulator pump

It is necessary to install a gate valve with union fitting (or flange in larger sizes) in the route of the water flow pipe of all pumps to allow the cutting off of the flow of water in the pipe and removing the pump from its location for carrying out possible repairs.

It is essential to implement a bypass pipe route, which has an identical size with the main pipe, and gate valve in its path for each single-circuit circulator pump.

It is required to install a one-way valve horizontally on the route of outlet water from pumps to prevent returning the water of the system to pumps.

circulator pump

After all, if you had more questions to decide for buying different types of linear circulator pump and ground circulator pump, you can contact to DamaTajhiz company and ask your questions from sales consultant of heating equipment department through this internal numbers: 121 - 122 - 124 - 125 117

Placing an Order and Warranties for Circulator Pump

  • Offering the best price guarantee for all products, the prices for Circulator Pump presented by DamaTajhiz are up-to-date and discount-included (see Best Price Guarantee at DamaTajhiz.com).
  • At DamaTajhiz.com, we provide all the information you need, as well as guaranteed unbeatable prices, for several models of Circulator Pumps from reliable manufacturers, with original warranties, to bring you the thrill of an ideal, intelligent purchase.

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Efficiency is our motto, your profit our priority

Gal .(am.) =3.785 Lit
1M³ =1000 Lit
1M³/hr. x 4.4 = 1 GPM
1M³ =264.2 Gal.am
1 G.P.M. x 0.2271 =14.7 PSI
1M3 =35.315 Ft³
The height of water tower Atm.=14.7 PSI
1 Atm = 10.331

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