According to the recommended standards of facility engineering, in buildings that have 8 units or more, it is necessary to consider a "reserve" circulator pump with the same power, head and flow rate as the main pump. It is better to separate the pump function. The spa circulator of the heating (or cooling) system of the building with the circulation path of the spa feeding the boiler in the coil source, for each of the two paths, for better use in different seasons of the year, a separate circulator pump should be installed. Circulator pumps are operated by a wall thermostat installed on the return water pipe of the heating (or cooling) system.
Setting the temperature of the wall thermostat installed on the suction pipeline of the circulator pump should usually be about 5 degrees Celsius lower than the set temperature of the submerged thermostat of the building's hot water boiler.
Installing a strainer in the suction pipe of all pumps and It is necessary to install a shock absorber in the inlet and outlet pipes of ground circulator pumps.
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On the way of the water pipe to and from all pumps, install a gate valve with a spool nut (or a flange in larger sizes) in order to make it possible to cut off the water flow in the pipe and remove the pump from its location for possible repairs. It is mandatory. It is mandatory to implement a bypass pipe path for each single-circuit circulator pump with the main pipe size along with a gate valve in its path.
In order to prevent the system water from returning to the pumps. It is mandatory to install a one-way valve horizontally in the way of the water coming out of the pumps.
Circulator pumps are usually installed in the return water circuit of cooling or heating systems. In other words, they are placed before the central heating boiler in the heating systems and before the chiller in the cooling systems, so that the water output of the circulator pumps in the heating systems enters the boiler, then it is distributed to the radiators and fan coils. And in cooling systems, the water output of the circulator pump enters the chiller evaporator and then enters the fan coils and air conditioner coils. In order to return the unused hot water in the building's hot water piping, it is necessary to install the hot water return pump before the coil or double wall source on the hot water return pipe. Usually, the hot water return pump used for the double-wall source or even the coil source of the building's motor house is considered to be a 1-inch or 1/4-inch Grundfos, DAB, or WILO brand linear pump.
