Siemens RDF302 User Manual

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Siemens RDF302 Basic documentation CE1P3079en
Smart Infrastructure 2022-06-17
3.2 Operating modes
The thermostat's operating mode can be influenced in different ways. e.g.
operating mode button, switch over contact, Modbus, etc. Specific heating and
cooling setpoints are assigned to each operating mode.
The operating mode can be selected via Modbus.
• If a bus command is received via MODBUS for either COMFORT or
ECONOMY operating mode, the symbol of the selected operating mode
will be displayed.
i.e. either COMFORT or ECONOMY symbol only
• If a bus command is received for PROTECTION mode, the AUTO TIMER
symbol ( ) will be displayed and all key buttons will be de-activated.
i.e. both PROTECTION and AUTO TIMER symbols
The thermostat returns the effective room operating mode on the Modbus.
The following operating modes are available:
In Comfort mode, the thermostat maintains the Comfort setpoint. This setpoint can
be defined via parameters P8, P9 and P10.
Also, it can be locally adjusted via the +/- buttons or remotely via Modbus.
In Comfort mode, the fan can be set to automatic or manual fan speed: Low,
medium or high.
A preset setpoint in economy mode can be defined via parameters P11 and P12.
The thermostat switches to Economy mode when...
– the operating mode button is pressed (only possible if parameter P02 is set to 2)
– Economy is sent via Modbus
– an operating mode switchover contact (e.g. keycard contact presence detector,
window contact) is active.
The contact can be connected to multifunctional input X1, X2.
Set parameter P38 / P40 to 3 (P02 is irrelevant) *)
– "Window state" is sent via Modbus
*) Operating mode switchover: Only one input source must be used, either local
input X1/X2 or Modbus.
User operations are ineffective and “OFF” is displayed if the operating mode
switchover contact is active, or if "Window state" is sent via Modbus. The
parameters related to X1 and X2 input functions are not applicable to
RDF302.B.
In Protection mode, the system is...
– protected against frost (factory setting 8 °C, can be disabled or changed via
P65)
– protected against overheating (factory setting OFF, can be enabled or changed
via P66)
No other operating mode can be selected locally if Protection mode is commanded
via Modbus. is displayed.
Room operating mode:
Preselection
Room
operating mode: State
Comfort
Economy
Window state
Note:
Protection

Siemens RDF302 Specifications

General

Brand	Siemens
Model	RDF302
Category	Thermostat
Language	English