2-Pipe Fan Coil Unit With Electric Heater - Siemens RDF301 Basic Documentation

Heating or cooling with
auxiliary heater
Electric heating, active in
cooling mode
Note:
Electric heating in
heating mode
Electric heating and
manual changeover
Digital input "Enable
electric heater"
Enable electric heater
Note:
Caution
Siemens
Building Technologies
3.6.4 3.6.4

2-pipe fan coil unit with electric heater

On 2-pipe applications with pipe applications with electric heater, the thermostat
heating / cooling mode with changeover, heating only, or cooling on heating cooling mode with changeover, heating only, or cooling only plus an
auxiliary electric heater. auxiliary
Cooling only is factory-set (P01 = 1) with enabled electric Cooling only is factory
In cooling mode, the valve receives an OPEN command if the acquired tempera In cooling mode, the valve receives an
ture is above the setpoint. ture is above the setpoint.
The electric electric heater receives an ON command if the acquired room temperature
drops below drops below "setpoint" minus "dead zone" (= setpoint for
electric heater is enabled (parameter P13 = ON). electric
"Setpoint f Setpoint for electric heater" is limited by parameter "Maximum setpoint
mode" (P10).
In heating mode, the valve receives an OPEN command if the acquired tempera In heating mode, the valve receives an
ture is below the setpoint. The ture is below the setpoint. The electric heater is used as
source when the heating energy controlled by the valve is insufficient. source when the heating energy controlled by the valve is insufficient. source when the heating energy controlled by the valve is insufficient.
The electric electric heater receives an ON command, if the temperature is below
"setpoint setpoint" minus "setpoint differential" (= setpoint for electric
The electric electric heater is active in heating mode only and the control output for the heater is active in heating mode only and the control output for the
valve is permanently disabled when manual changeover is selected (P01 valve is permanently disabled when manual changeover is selected (P01 valve is permanently disabled when manual changeover is selected (P01 = 2).
Remote enabling / disabling of the electric heater is possible via input X1 Remote enabling
tariff regulations, energy savings, etc. tariff regulations, energy saving
Input X1 or X2 must be commissioned accordingly (parameter Input X1
section section 3.9.
The electric electric heater can also be enabled / disabled via bus
If "Enable Enable electric heater" input is used via bus, then the function
assigned to a local input X1 or X2. assigned to a local input X1
An electric electric heater must always be protected by a safety heater must always be protected by a safety limit thermostat!
RDF301, RDF301.50..., RDF600KN, RDF600KN/S RDF301, RDF301.50..., RDF600KN
thermostat controls a valve in
command if the acquired tempera-
command if the acquired room temperature
setpoint for electric heater) while the
command if the acquired tempera-
heater is used as an additional heating
command, if the temperature is below
heater is possible via input X1 or X2 for
input is used via bus, then the function must not be
Basic Documentation ocumentation
heater
electric heater (P13).
Maximum setpoint for Comfort
electric heater).
(parameters P38, P40). See
via bus.
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2017-12-07