Bedienungsanleitung Remeha Gas 3002 ECO (Seite 24 von 36) (Englisch)

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The input resistance at the analog input is approx. 10 kΩ

(see also electrical wiring diagram at para. 10.9). This

signal represents the start command and the required

output of the boiler according to fig. 16.

B2. Through the RS 232 bus.

Select in the service level the option 'Input selection:

computer'. Through a PC or BMS the start/stop com-

mand and the required flow temperature are now trans-

mitted to the boiler.

Contact our technical department for more information

about RS 232 connection.

10.4.3 High/low control

It is also possible to control the boiler high/low.

The internal PI control cannot be used for high/low con-

trol. Switch off the internal control to select in the service

level the option 'Control selection: external' (see para.

7.3.3). The boiler now can operate on two volt free con-

tacts. The first step should be connected to terminal 23

and 24 and is indicated by the following symbol:

The current through the contacts is approx. 6 mA. And

the second step to 25 and 26 is indicated by the fol-

lowing symbol:

The power for this input is supplied by the boiler at a level

of 24V DC. The current through the contacts is approx. 6

mA. The terminal strip is in the boiler control panel (see

the electrical wiring diagram at para. 10.9).

10.5 Connections

10.5.1 Other inputs

General:

All inputs (with the exception of the analog input) are

powered via the boiler with a voltage of 24 V DC.

The current is approx. 6 mA per input. No connection

whatsoever may be connected in any way with the

phase, zero or earth of the mains power circuit. All con-

nections must be made with potential-free contacts.

10.5.2 Blocking inputs

The control system is equipped with two blocking inputs

which can switch off the boiler. These inputs can be

used, for example, in combination with the limit switches

throttling valves, minimum gas pressure switches, etc.

Blocking input 1 is fitted on terminals 29 and 30, whilst

blocking input 2 is fitted on terminals 31 and 32.

The symbol for both inputs is:

If you wish to use either input, the wire bridge must first

be removed. As long as the input is opened, the relevant

message will appear on the display until the contact is

made.

10.5.3 Locking input

The control system is equipped with one input which may

lock the boiler. These input can be used, for example, in

combination with the maximum gas pressure switch, the

locking input is fitted on terminals 33 and 34.

The symbol for the input is:

If you wish to use the input, the wire bridge must first

be removed. As long as the input is opened, the boiler

will be locked, and the relevant message will appear on

the display. Once the contact is closed, the boiler must

once again be released via the reset button.

10.5.4 Gas leak check

A gas leak check, to be supplied by Remeha, can be

connected to inputs 37 and 38. In this case, the control

must be adjusted for the presence of the gas leak check

at the service level (see para. 7.3.3, option 7).

The symbol for this input is:

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