Explanation Example 2-Pipe System; Function "Heat Request; Purpose And Activation - Siemens RMB795B Basic Documentation

RMU7...
Controller 1
1
T
Heat source
Setting values
Refrigeration
requistion
Refrig distr zone
consumer side: 1
Setting values
Controller 1
Illustration notes
Purpose
Siemens
Building Technologies

11.1.3 Explanation example 2-pipe system

RMH760
Controller 2 Controller 3
Manual changeover
1
T
T
DHW heating
Heat requistion
Heat distr zone
consumer side: 1
Controller 2 Controller 3
With the 2-pipe system, the heat or refrigeration demand signal is sent to the
primary plant depending on the changeover position.
(1) and (2) stand for the distribution zone numbers.
11.2

Function "Heat request"

11.2.1 Purpose and activation

The "Heat request" function collects heat requests from different devices on the
bus.
From these signals, a resulting preselected setpoint is determined (temperature
request signal, heating flow setpoint, which is passed on to other devices via the
"Heat demand" function block.
Central control unit RMB795B
Distribution zones
RMB795 RXB...
Controller 4
2
2
T
Fan coil
room A
Heat demand
Heat demand
Heat requistion
Heat distr zone
source side: 1
Heat distr zone Heat distr zone
consumer side: 2 source side: 2
Refrigeration
Refrigeration
demand
demand
Refrigeration
requistion
Refrig distr zone
source side: 1
Refrig distr zone Refrig distr zone
consumer side: 2 source side: 2
Controller 4
Konnex TP1
RXB... RXB...
Controller 5 Controller 6
T
T
Fan coil Fan coil
room B room C
Heat demand
Heat demand
Heat distr zone Heat distr zone
source side: 2 source side: 2
Refrigeration
demand
Refrigeration
demand
Refrig distr zone Refrig distr zone
source side: 2 source side: 2
Controller 5 Controller 6
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CE1P3122en
18.01.2012