DAB MCE-22/C Istruzioni per l'installazione e la manutenzione - Pagina 13

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7.1.6

∆T-costant function

This feature allows the circulator to increase or decrease the flow rate to keep the temperature difference T-T1 constant in absolute

value.

There are 2 setpoints: dTs1, dTs2 and, therefore, you can have the following 2 situations:

dTs1 different from dTs2:

In this case there are 5 configurable operation intervals in which the dTs setpoint can vary depending on the temperature T or T1 as

shown in the following example:

If T1 ≤ 10°C = > dTs = |T-T1| = 10°C

In this case, when the temperature T1 is less than or equal to 10°C, the circulator operates by acting on the flow rate to keep the

absolute difference between T and T1 constant at 10°C.

This temperature range can be useful in the ramp up phase of the thermal machine where it is more important to have a rapid

achievement of environmental comfort rather than a higher DT (case of air conditioning).

If 10 ≤ T1 ≤ 25°C = > 10°C ≤ dTs = |T-T1| ≤ 15°C, for example if T1= 20°C = > dTs = |T-T1| = 13.33°C

when the temperature T1 is between 10°C and 25°C, the circulator works to keep the absolute difference between T and T1 constant

at a dTs proportional to the temperature recorded by T1. For example, when T1= 20°C, the circulator keeps the absolute difference

between T and T1 constant at 13.33°C.

If 25°C ≤ T1 ≤ 40°C = > dTs = |T-T1| = 15°C

when the temperature T1 is between 25°C and 40°C, the circulator works to keep the absolute difference between T and T1 constant

at 15°C

If 40°C ≤ T1 ≤ 70°C = > 10°C ≤ dTs = |T-T1| ≤ 15°C, for example if T1= 50°C = > dTs = |T-T1| = 13.75°C

when the temperature T1 is between 40°C and 70°C, the circulator works to keep the absolute difference between T and T1 constant

at a dTs inversely proportional to the temperature recorded by T1. For example, when T1= 50°C, the circulator keeps the absolute

difference between T and T1 constant at 13.75°C.

If T1 ≥ 70°C = > dTs = |T-T1| = 10°

Finally, when the temperature T1 is higher than 70°C, the circulator works to keep the absolute difference between T and T1 constant

at 10°C.

This temperature range can be useful in the ramp up phase of the thermal machine where it is more important to have a rapid

achievement of environmental comfort rather than a higher DT (case of heating).

N.B.: The parameters dTs1 and dTs2 and the values of the operating ranges can be set by the user.

dTs1 = dTs2

In this case the dTs setpoint is constant when the temperature T or T1 changes, as shown in the following example:

In this case the circulator increases or decreases the flow rate to keep the absolute difference between T and T1 constant at dTs =

15°C.

N.B.: The parameter dTs can be set by the user.

7.2

Quick Start function

This function can be useful when it is necessary to guarantee an immediate flow rate, in order to avoid a possible boiler block at the

moment of ignition. As long as input I3 is enabled, the pump remains at the preset frequency Fq (see advanced menu). In twin groups,

this input can be used independently.

CONTROL PANEL

The functions of the MCE-22/C may be modified by means of the control panel on the cover of the MCE-22/C itself.

On the panel there are: a graphic display, 7 navigation buttons and 3 LED warning lights (see Figure 10).

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