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MAGNA3 D 32-80 180 97924451
Инструкция по эксплуатации Страница: 32

Grundfos MAGNA3 D 32-80 180 97924451 [32/1656] English gb

English (GB)

"Const. temp."

This control mode ensures a constant temperature. Constant

temperature is a comfort control mode that you can use in

domestic hot-water systems to control the flow to maintain a fixed

temperature in the system. See fig. 39. When you use this control

mode, do not install any balancing valves in the system.

If the pump is installed in the flow pipe, install a temperature

sensor in the return pipe of the system. Install the sensor as close

as possible to the consumer for example a radiator or heat

exchanger.

We recommend that you install the pump in the flow pipe.

If the pump is installed in the return pipe of the system, you can

use the internal temperature sensor. In this case, install the pump

as close as possible to the consumer for example a radiator or

heat exchanger.

The constant-temperature control mode also reduces the risk of

bacterial growth in the system, for example legionella.

Sensor range:

• minimum -10 °C

• maximum 130 °C.

To ensure that the pump is able to control the temperature, we

recommend that you set the sensor range between -5 and +125

°C.

Fig. 39 Constant temperature

"Differential temp."

This control mode ensures a constant differential-temperature

drop across heating and cooling systems.

The differential-temperature control mode is available from model

B. The model version is stated on the nameplate. See fig. 22.

In this control mode, the pump maintains a constant differential

temperature between the pump and the external sensor. See

figures 40 and 41.

Fig. 40 Differential temperature

Fig. 41 Differential temperature

The controller constants, that is the gain, K

and integral time,T

are factory-set to gain is equal to 1 and integral time is equal to 8

seconds. In some cases, you must change the settings

depending on the application and controlled parameter. See

section 8.6.4 "

Controller settings

"Constant curve"

You can set the pump to operate according to a constant curve,

like an uncontrolled pump. See fig. 42.

You can set the desired speed in % of maximum speed in the

range from minimum to 100 %.

Fig. 42 Constant curve

If you have set the pump speed in the range between minimum

and maximum, the power and pressure are limited when the

pump is running on the maximum curve. This means that the

maximum performance can be achieved at a speed lower than

100 %. See fig. 43.

Fig. 43 Power and pressure limitations influencing the

maximum curve

TM05 2451 5111TM05 2451 5111

It is necessary to install an external temperature

sensor.

Δt

TM05 8236 2113TM05 2446 0312TM05 4266 2212

Min.

30%

50%

70%

90%

Limited maximum curve

Speed setting from min. to 100 %

Grundfos MAGNA3 D 32-80 180 97924451 [32/1656] English gb

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