Siemens RDB160BN - 2-Pipe Fan Coil Unit Control

Applications
Control sequences
4
A6V11917618_en
--_b 15 | 52
Parameter
P02 = 0
P02 = 1
P02 = 2
Sequence
Available for basic
application ¹
Heating
Cooling
= heating
sequence for el.
heater
Automatic heating
/ cooling
changeover via
external water
temperature
sensor or remote
switch
2-pipe
2-pipe & el. heater
4-pipe
✔ ✔ ✔
Notes:
¹ For chilled ceiling with radiator applications refer to chapter 'Chilled ceiling
with radiator [➙ 18]'.
For the relation between setpoints and sequences refer to chapter 'Setpoint
and sequences [➙ 18]'.
4.3.2 2-pipe fan coil unit
In 2-pipe applications, the thermostat controls a valve in heating / cooling
mode with automatic changeover (heating only or cooling only). Factory setting
is heating / cooling automatic changeover (P02 = 1).
On/Off control
Control sequence On/Off output:
The diagrams below show the control sequence for 2-position control.
Heating mode
Cooling mode
T[°C]
Room temperature
V1
Control command 'Valve'
W
Room temperature setpoint
ΔT
Hysteresis (P10)
T °C
T °C
T °C
T
w
T [°C]
T
V1
1
0
Y
w
T [°C]
T
V1
1
0
Y