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212

Double thermostat

Control Thermostat /

Thermal Reset Limit

Thermostat

RAZ-TW..

Combination of electromechanical TR and TW

• 2-position control thermostat and thermal reset limit thermostat with single-

pole changeover microswitches

• Switching capacity of microswitches:

contact connection 1-2 16 (2.5) A, AC 250 V

contact connection 1-4 6 (2.5) A, AC 250 V

• Time constant conforming to DIN EN 14597

• Push-in

terminals for fast wiring

• 2 mounting choices: pocket or wall mounting

• External setting knob for setpoint adjustment

• Internal adjustment of the switch-off temperature

Use

Typical applications:

• Heat generation plant

• For general use in heating, ventilation and air conditioning plant

CE1N1212en

2014-07-30

Building Technologies

Summary of content (6 pages)

PAGE 1
212 Double thermostat Control Thermostat / Thermal Reset Limit Thermostat RAZ-TW.. Combination of electromechanical TR and TW • 2-position control thermostat and thermal reset limit thermostat with singlepole changeover microswitches • Switching capacity of microswitches: contact connection 1-2 16 (2.5) A, AC 250 V contact connection 1-4 6 (2.
PAGE 2
Function When the adjustable setpoint of the control thermostat (RAZ-TR..) is reached on rising temperature, contact connection 1-2 changes over to contact connection 1-4. When the temperature of the medium falls by the value of the switching differential, the control thermostat reverts to contact connection 1-2. When the internally adjusted switch-off temperature of the thermal reset limit thermostat (RAZ-TW..) is reached, contact connection 1-2 changes over to contact connection 1-4.
PAGE 3
Notes Mounting aid Installation Instructions are enclosed in the package. Mounting location It must be ensured that there is sufficient clearance above the thermostat for adjusting the setpoint and for removing or replacing the thermostat, if required. Pocket mounting Mount the pocket and adjust the hexagon as required. Immerse the capillary sensing element in the pocket and secure the base to the pocket by means of the screw. Double pocket (ALT-DB..J) with the ending „J“ fits to this RAZ units only.
PAGE 4
Technical data Switching mechanism of TR and TW Directives and Standards Environmental conditions Calibration Connections Switching capacity Nominal voltage AC 24…250 V Nominal current I (IM) contact connection 1-2 0.1…16 (2.5) A contact connection 1-4 0.1… 6 (2.5) A External fuse 16 A Life expectancy at nominal rating min. 250 000 switching cycles TR contact TW contact min. 100 000 switching cycles Safety class I to EN 60 730 Degree of protection: IP 40 to EN 60 529 Temperature range RAZ-TW.
PAGE 5
General data Housing colors Dimensions of sensing elements TR and TW Capillary length Min. bending radius of capillary Construction Carrier of switching mechanism Capillary tube and sensing elements Diaphragms Weight of standard set base RAL 7001 (dark-grey) cover RAL 7035 (light-grey) 6.5 mm dia. x 85 mm / 6.5 mm dia. x 76 mm 700 mm R min. = 5 mm plastic copper stainless steel 0.53 kg 1) The documents can be downloaded from http://siemens.com/bt/download.
PAGE 6
Dimensions ALT-DB…J 6/6 2011-2014 Siemens Switzerland Ltd Siemens Building Technologies Control Thermostat / Thermal Reset Limit Thermostat RAZ-TW Subject to change CE1N1212en 2014-07-30