User Manual

Siemens Building Technologies CM2N8892en / 02.2000

Landis & Staefa Division 1/4

892

VISONIK

Optimum Start/Stop Program BPS

Function sheet

The Optimum Start/Stop Program OSTP of the VISONIK BPS is used to optimally

control energy consumption of building zones. The OSTP aims at achieving the

longest possible temperature setback on heating and temperature increase on

cooling during the night, weekends, and holidays.

To achieve optimal energy control of a building, it is divided into zones as shown below

by two heating zones:

Start Stop

Start

Stop

Zone South

Zone North

Production

Offices

Ref

8892Z01E

Ref

A building zone may comprise one or several rooms. The building zone must fulfil the

following conditions:

– All rooms within a building zone are controlled by the same building services system.

– All rooms within a building zone have the same occupancy hours (B).

– Each building zone must have a designated reference room. This room's inside

temperature (T Ref) serves as the comfort temperature's actual value to control all

rooms belonging to this building zone.

Use

Building zones for

optimal control

Conditions for the

building zones

PAGE 1
8 892 VISONIK® Optimum Start/Stop Program BPS Function sheet The Optimum Start/Stop Program OSTP of the VISONIK BPS is used to optimally control energy consumption of building zones. The OSTP aims at achieving the longest possible temperature setback on heating and temperature increase on cooling during the night, weekends, and holidays.
PAGE 2
OSTP functions List of functions The OSTP programs automatically conducts the following functions: Function Explanation Optimum Start The start-up time for heating or cooling of a building zone is calculated by the OSTP to reach the desired setpoint temperature (inside temperature of a building zone) at the beginning of occupancy.
PAGE 3
OSTP phases Diagram A zone controlled by OSTP can experience several phases with the associated start and end points in the course of a phase (normally 24 hours). These phases are shown below.
PAGE 4
Energy-optimised control Introduction Energy-optimised control occurs through interaction of both the Optimum Start/Stop Program OSTP and the timeswitch program TSP and plant control. The OSTP program does not contain any control functions. However, it issues commands via the zone reactions to the plant control.