Heating Engineer Level; Accessing; Sensor Calibration; Optimum Start Control - Siemens REV23 User Manual

Heating engineer level

Accessing

Sensor calibration

CAL
Limitation of setpoint

Optimum start control

Example with an ac-
tual room temperature
of 18 °C and a setpoint
of
20 °C:
Control
Self-learning mode
Exceptions
Siemens Building Technologies
HVAC Products
To access the heating engineer level, keep the warmer and colder buttons depressed
and simultaneously roll the roller selector away from the display and then toward the
display.
If the displayed temperature does not correspond to the effective room temperature, the
temperature sensor can be recalibrated (recalibration to be made on the heating engi-
neer level).
The displayed temperature can be matched to the effective room temperature in incre-
ments of 0.2 °C (max. ±2 °C).
Minimum setpoint limitation of 16 °C prevents undesired heat transfer to neighboring
apartments in buildings with several heating zones. The setting is to be made on the
heating engineer menu.
Optimization brings forward the switch-on point of the first heating period such that the
adjusted setpoint will be reached at the desired time.
The setting depends on the type of controlled system, that is, on heat transmission
(type of piping system, radiators), building dynamics (building mass, insulation), and
heat output (boiler capacity, flow temperature).
Optimum start control is switched off at
T
P
on
°C
20
TR
19
x
18
17
16
- 4 h
1h/°C
- 2 h
1/2h/°C
- 1 h
1/4h/°C
Optimum start controll Off
T Temperature (°C)
t Forward shift of switch-on point (h)
The REV23 is a 2-position controller providing PID mode. The room temperature is
controlled through the cycling switching of an actuating device.
The controller generates the positioning signals depending on the deviation of the ad-
justable setpoint from the actual value acquired by the built-in temperature sensor.
The rate of response to the deviation depends on the selected control algorithm:
The controller is supplied with an active self-learning operating mode, enabling it to
automatically adapt to the controlled system (type of building construction, type of ra-
diators, size of the rooms, etc.). After a certain learning period, the controller optimizes
its parameters and then operates with the learned parameters.
In exceptional cases, in which the self-learning mode may not be ideal, it is possible to
select PID 12, PID 6 or 2-Pt mode:
Room Temperature Controller REV23
- 2
- 3 h h
- 1
- 1½ h h
- ½
- ¾ h h
TR
x
P
on
T
1 heating period
st
Start
- 1 h
(slow controlled system)
- ½ h
(medium controlled system)
- ¼ h
(fast controlled system)
(no impact)
Actual value of room temperature
Starting point of optimum start control
t
7/12
CE1N2264en
23.04.2002