AS/NZS 60335.2.51:2020 pdf free.Household and similar electrical appliances – Safety Part 2.51: Particular requirements for stationary circulation pumps for heating and service water installations.
7 Marking and instructions
This clause of Part 1 is applicable except as follows.
7.1 Addition:
Circulation pumps shall be marked with
— the TF class;
— the direction of the water flow;
— the direction of rotation (for pumps having three-phase motors);
— the rated current (for pumps having three-phase motors if a protective device has to be installed in the fixed wiring).
7.12 Modification:
The instruction concerning persons (including children) with reduced physical, sensory or mental capabilities, or lack of experience and knowledge is not applicable.
The instruction regarding supervision of children is not applicable.
7.12.1 Addition:
The installation instructions shall state the substance of the following:
— the maximum flow rate or total head:
— the maximum ambient temperature at which the pump is to be used;
— the maximum system pressure, which shall not be less than:
• 0.6 MPa for pumps for heating systems;
• 1,0 MPa for pumps for service water systems:
— the intended orientation of the pump:
— a protective device is to be installed in the fixed wiring and its characteristics are to be specified (for pumps having a three-phase motor not incorporating a protective device).
— for the thermal insulation of circulation pumps in heating systems. only the supplied kit or a kit made available by the manufacturer shall be used. It shall be ensured that the drain openings of the motor are not sealed after installation of the thermal insulation.
8 Protection against access to live parts
This clause of Part 1 is applicable.
9 Starting of motor-operated appliances
This clause of Part 1 is not applicable.
10 Power input and current
This clause of Part 1 is applicable.
11 Heating
This clause of Part 1 is applicable except as follows.
11.2 Addition:
Circulation pumps that are only fixed by the water pipes are positioned against one wall of the test corner and away from the other.
11.3 Addition:
The temperatures tp and t2 are the ambient temperatures of the environment in which the pump is installed, for instance inside the enclosure of a boiler.
11.7 Replacement:
Circulation pumps are operated until steady conditions are established.
11.8 Addition:
The temperature rise limits of pumps located within the enclosure of a boiler are reduced by the difference between the ambient temperature at which the test is carried out and 25 °C.
The temperature rise of the external enclosure is not measured.
For circulation pumps in which water flows through the motor, the temperature rise limits for windings are increased by 5 K. The temperature rise limits are increased further by – 5 K, if the winding insulation is class 130 (B).AS/NZS 60335.2.51 pdf download.