Siemens RDG100 User Manual

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Siemens RDG100, RDG100T, RDG110, RDG140, RDG160 Basic Documentation CE1P3181en
Building Technologies Functions 14 Dec 2011
4.7.4 2-pipe fan coil unit with electric heater
On 2-pipe applications with electric heater, the thermostat controls a valve in
heating / cooling mode with changeover, heating only, or cooling only plus an
electric heater.
Cooling only is factory set (P01=1) with enabled electric heater (P13).
In cooling mode, the valve receives an OPEN command if the acquired tempera-
ture is above the setpoint.
The electric heater receives an ON command if the acquired room temperature
drops below “setpoint” minus “dead zone” (= setpoint for electric heater) while the
electric heater is enabled (parameter P13 = on).
Note: “Setpoint for electric heater” is limited by parameter “Maximum setpoint for
Comfort mode” (P10).
In heating mode, the valve receives an OPEN command if the acquired tempera-
ture is below the setpoint. The electric heater is used as an additional heating
source when the heating energy controlled by the valve is insufficient.
The electric heater receives an ON command, if the temperature is below “setpoint”
minus “setpoint differential” (= setpoint for electric heater).
The electric heater is active in heating mode only and the control output for the
valve is permanently disabled when manual changeover is selected (P01=2).
Remote enabling / disabling of the electric heater is possible via input X1, X2 or D1
for tariff regulations, energy savings, etc.
Input X1, X2, or D1 must be commissioned accordingly (parameters P38, P40,
P42). See section 4.10 “Multifunctional input”.
An electri
c heater must always be protected by a safety thermostat!
ON/OFF control
The diagrams below show the control sequence for 2-position.
Heating mode
(automatic changeover = heating or heating only)
Cooling mode
(man. / auto. changeover = cooling or cooling only)
Y
½ SDH
1
0
½ SDH
w
3191D06
T[°C]
YHC
½ SDH
½ SDH
YE
w
D
Y
½ SDC
1
0
½ SDC
w
3191D05
T[°C]
YHC
½ SDH
½ SDH
YE
x
dz
Heating mode with manual changeover (P01=2)
(manual changeover = heating)
T[°C] Room temperature
W Room temperature setpoint
YHC Control command “Valve” or “Compressor”
YE Control command “Electric heater”
SDH Switching differential “Heating” (P30)
SDC Switching differential “Cooling” (P31)
X
dz
Dead zone (P33)
½ SDH
1
0
½ SDH
w
Y
3076D07
T[°C]
YE
w
D
Setpoint differential (P34)
Heating or cooling with
auxiliary heater
Electric heating, active in
cooling mode
Electric heating in
heating mode
Electric heating and
manual changeover
Digital input “Enable
electric heater”
Caution
Control sequence
on/off output

Siemens RDG100 Specifications

General

Brand	Siemens
Model	RDG100
Category	Thermostat
Language	English