User Manual

ManualsBrandsSiemens ManualsThermostats (temperature controller with sensor)Room Thermostats RAB21..

016

RAB21

RAB21.1

Room Thermostats

RAB21..

For two

-pipe fan coils

• Room thermostat for heating or cooling

• Changeover function (with external automatic aquastat)

• Two-postition control

• Manual three-speed fan switch

• Switching voltage AC 24…250 V

• Control output ON/OFF

Use

The RAB21.. room thermostat is used in heating or cooling systems to maintain the

selected room temperature.

Typical use:

• Commercial buildings

• Residential buildings

• Light industrial buildings

In conjunction with

− zone valves and thermal valves

− fans

− aquastats

CE1N3016en

2016-03-25

Building Technologies

Summary of content (6 pages)

PAGE 1
3 016 RAB21 RAB21.1 Room Thermostats RAB21.. For two-pipe fan coils • • • • • • Room thermostat for heating or cooling Changeover function (with external automatic aquastat) Two-postition control Manual three-speed fan switch Switching voltage AC 24…250 V Control output ON/OFF Use The RAB21.. room thermostat is used in heating or cooling systems to maintain the selected room temperature.
PAGE 2
Functions Heating If the room temperature falls below the selected setpoint, the heating contact will close. Cooling If the room temperature exeeds the selected setpoint, the cooling contact will be closed. 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) Antomatically by switching to the select fan speed via the thermostat for controlled operation.
PAGE 3
Accessories Description Adapter plate 120 x 120 mm for 4“ x 4“ conduit boxes Adapter plate 96 x 120 mm for 2“ x 4“ conduit boxes Adapter plate for surface wiring 112x130 mm Type refernce ARG70 ARG70.1 ARG70.2 Technical design Key features of the RAB21.. fan coil room thermostat: • Two-position control • Gas-filled diaphragm Adjustments The required temperature can be selected by a setpoint adjuster on the front of thermostat.
PAGE 4
Maintenance The room thermostat is maintenance-free. Mechanical design The diaphragm is filled with environmentally friendly gas. The thermostat housing is made of plastic. Ordering Type (ASN) Part number (SSN) Description RAB21 RAB21.1 S55770-T227 S55770-T228 Room thermostat RAB21 Room thermostat RAB21.1 Disposal The devices are considered electronics devices for disposal in term of European Directive 2012/19/EU and may not be disposed of as domestic waste.
PAGE 5
Connection diagrams Heating or cooling Changeover for heating or cooling (with external automatic aquastat) D1 L N M1 N1 Q1 Q2 Q3 Y1 Y2 Zone valve or thermal valve for heating or cooling Switching voltage AC 24…250 V Neutral 3-speed fan Room thermostat Control output "Fan speed I", AC 24…250 V Control output "Fan speed II", AC 24…250 V Control output "Fan speed III", AC 24…250 V Control output "Valve actuator heating", AC 24…250 V Control output "Valve actuator cooling", AC 24…250 V 3016A02 3016A01 T
PAGE 6
Remarks Heating: Because of the unavoidable self heating effects of the electrical current, any loads of more than 3 Amperes connected to the unit can influence the control behavior and temperature accuracy in a negative way. Cooling: Because of the unavoidable self heating effects of the electrical current, any loads of more than 1 Amperes connected to the unit can influence the control behavior and temperature accuracy in a negative way.