Siemens RDG100T Documentation

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Siemens RDG100, RDG100T, RDG110, RDG140, RDG160 Basic Documentation CE1P3181en
Building Technologies Functions 28 May 2009
4.7.7 4-pipe fan coil unit with electrical heater
On 4-pipe applications with electrical heater, the thermostat controls 2 valves in
heating and cooling mode by manual selection, heating and cooling mode with
automatic changeover, heating only, or cooling only plus an auxiliary electrical
heater. Heating and cooling is factory-set (P01=4).
The electrical heater is used as an additional heat source when the heating energy
controlled by the valve is insufficient.
The electrical heater receives an ON command when the temperature is below
“setpoint” minus “1/2 "dead zone" minus "setpoint differential" (= "setpoint for
electrical heater").
Remote enabling / disabling of the electrical heater is possible via input X1, X2, or
D1 for tariff regulations, energy saving, etc.
Input X1, X2, or D1 must be commissioned accordingly (parameters P38, P40,
P42). See section 4.10 “Multifunctional input”.
An electri
cal
heater must always be protected by a safety thermostat!
The heating or cooling output can be released via operating mode button if
parameter P01 is set to manual (P01=2).
See section 4.7.6.
The diag
ram belo
w shows the control sequence for 2-position control.
Heating mode with manual selection (P01=2) Cooling mode with manual selection P01=2)
Y
1
0
w
3181D125
T[°C]
½ SDH ½ SDH
Y1
½ SDH ½ SDH
W
D
Y2 (YE)
Y
½ SDC
1
0
½ SDC
w
3181D126
T[°C]
Y3
Heating and cooling mode (P01=4)
T[°C] Room temperature
w Room temperature setpoint
Y2 Control command “El. heater"
Y1 Control command “Valve” or “Comp.” (H)
Y3 Control command “Valve” or “Comp.” (C)
SDH Switching differential “Heating” (P30)
SDC Switching differential “Cooling” (P31)
X
dz
Dead zone (P33)
Y
½ SDC
1
0
½ SDC
w
3181D113
T[°C]
Y3
½ SDH
½ SDH
Y1
½
x
dz
½ x
dz
½ SDH ½ SDH
W
D
Y2 (YE)
w
D
Setpoint differential (P34)
Heating and cooling with
auxiliary heater
Electrical heating in
heating mode
Digital input “Enable
electrical heater”
Caution
4-pipe application with
manual changeover
“Main and secondary”
application
ON/OFF control
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Siemens RDG100T Specifications

General

Brand	Siemens
Model	RDG100T
Category	Thermostat
Language	English