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Siemens Room Thermostats RAB31.. CE1N3017en
Building Technologies 2015-01-07
Functions
If the room temperature falls below the selected setpoint, the heating contact will close.
If the room temperature exceeds the selected setpoint, the cooling contact will close.
There are two possibilities to control the fan speed:
a) Manually by means of the three - speed fan switch on the thermostat for continuous
operation
b) Automatically by switching to the selected fan speed via the thermostat for
controlled operation. In that case – prior to commissioning – the jumper positions
corresponding to the thermostat function must be selected. There are two choices of
jumper positions available on printed circuit board:
SR1
SR2
Selected fan speed as continuous operation
Auto Fan is switched at the same time as the cooling or
heating valve, depending on the switch position.
When the ventilation function is selected (RAB31.1) on the cover by setting the slide
switch, the heating and cooling contacts are always open and the fan operates at the
selected speed.
Heating or cooling is selected with a switch located on the front of the thermostat.
Heating Cooling
T Room temperature
SD Switching differential
W Room temperature
setpoint
Y1 Valve output signal
"Heating"
Y2 Valve output signal
"Cooling"
Type summary
Four-pipe fan coil room thermostat for use with 3-speed fan, manual
changeover RAB31
Four-pipe fan coil room thermostat for use with 3-speed fan, manual
changeover and ventilation function
RAB31.1
Equipment combinations
Type of unit Type reference Data sheet *)
Motoric on/off actuator SFA21.. 4863
Thermal actuator (for radiator valve) STA21.. 4893
Thermal actuator (for small valve 2,5 mm) STP21.. 4878
Electromotoric actuator for zone valve VVI46..
(2 position on / off)
SUA21.. 4830
*)
The documents can be downloaded from http://siemens.com/bt/download .
Heating
Cooling
Fan speed
Ventilation
Changeover
Function diagrams