Hydraulic Components

SDC / DHC

 

 

7.3.10.4External switching modem

Function Only activated if setting 11 (external switching modem) was selected for parameter 08, 09 or 10 (variable inputs) in the "Hydraulics" menu.

This configuration allows switching between control modes via the telephone using a switching modem to be provided by the user (for holiday homes etc.).

Assignment A switching modem can be assigned to each of the three variable inputs (VI1 ... VI3). If a variable input is assigned this function, the associated parameter appears in the "System" menu for assignment of the switching modem to the respective heating circuit. The same parameters and areas are involved here as with the demand contact, i.e. the modem acts either on the direct circuit (DC), mixed heating circuit 1 (MC1), mixed heating circuit 2 (MC2), hot-water circuit (HW) or the entire system (ALL), i.e. globally on all central devices on the data bus system.

The control mode depends on the wiring at the respective variable input in the following way:

Connection terminal of variable input 1 (2, 3) open:

Control based on the current control mode (AUTO, RED.

HEATING, HEATING, STANDBY)

Connection terminal of variable input 1 (2, 3) short-circuited:

Control functions in standby mode; heating and hot water are switched off frost protected.

Connection terminal of variable input 1 (2, 3) with terminating resistor with 10 kOhm

Control based on continuous heating.

Connection terminal of variable input 1 (2, 3) with terminating resistor with 2.2 kOhm

Control based on continuously reduced operation (according to specification as reduced or switch-off mode).

NOTE Only one modem can be connected to each control device.

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EN2H-0221GE51 R0808

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Honeywell EN2H-0221GE51 R0808 service manual External switching modem, Connection terminal of variable input 1 2, 3 open
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EN2H-0221GE51 R0808 specifications

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