Manual Nefit EMS (page 18 of 88) (English, German, Dutch, French, Italian, Portuguese, Spanish)

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18 | Commissioning

MC 4006 720 816 739 (2015/05)

4.5 Cascade settingsmenu

When a cascade module is installed, the menu Service menu > Cascade

settings is displayed on the user interface (not available for all user

interfaces). When this menu is not available in the installed user

interface, the cascade module uses default settings. These settings can

be changed with an appropriate user interface even when the user

interface is only temporarily connected.

4.6 Diagnosismenu

The menus depend on the installed user interface and the installed

system.

Monitored values

If a MC 400 module is installed, the Monitored values > Cascade menu

is displayed.

This menu allows you to call up information on the current status of the

system and the individual devices in the cascade. For example, you can

display the level of the system's flow and return temperature, or the

current appliance output.

If a MC 400 module is installed, the menu Monitored values > System

information > Cascade is displayed.

This menu allows you to call up information on the MC 400 module

(cascade module type, cascade module software version) and the

individual devices in the cascade (such as control device 1 type,

control unit 1 software version).

The information and values that are provided depend on the system that

has been installed. Observe the documents for the heat source, user

interface, additional modules and other system components.

The default settings are shown in bold in the adjustment

ranges.

Menu item Adjustment range Function description

Offset header sensor – 20 ... 0 ... 20 K The flow temperature demanded by the control is changed by this value.

Set temp. cascade max 30 ... 90 °C Maximum flow temperature of the cascade at the low loss header.

Casc. pump overrun time 0 ... 3 ... 15 min The heating pump (secondary side) connected to the cascade module runs for the time set here longer than for the

heat requirement.

Flow temp. peak load 30 ... 50 ... 70 °C In the control strategy "Serial cascade with peak load coverage" (coding card at position 3), the heat source

necessary to cover the peak load is connected when the flow temperature required by the controls exceeds the

value set here.

Outside temp. Peak load – 20 ... 10 ... 20 °C In the control strategy "Serial cascade with peak load coverage" (coding card at position 3), the heat source

necessary to cover the peak load is connected when the outside temperature falls below the value set here.

Start-up delay Next device 0 ... 6 ... 30 min Once a heat source is connected, the controls wait for the time set here until the next device is connected.

Tolerated overtemp. 0 ... 5 ... 10 K To reduce the device cycles, the heat sources are only turned off when the flow temperature exceeds the desired

set temperature by the tolerated overtemperature (positive switching differential).

Tolerated undertemp. 0 ... 5 ... 10 K To reduce the device cycles, the heat sources are only turned on when the flow temperature falls below the desired

set temperature by the tolerated undertemperature (negative switching differential).

Table 6

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