Siemens RAB20 Series Technical Instructions Download Page 9

RAB20 Series Two-pipe Fan Coil Room Thermostat Technical 

Instructions 

 

Document Number 155-526P25 

 

March 2, 2007 

Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and models as 
design improvements are introduced. Other product or company names mentioned herein may be the trademarks of their respective owners. 
© 2007 Siemens Building Technologies, Inc.

 

Siemens Building Technologies, Inc.

 

1000 Deerfield Parkway 
Buffalo Grove, IL  60089-4513 
U.S.A. 

Your feedback is important to us. If you have 
comments about this document, please send them to 

[email protected]

 

Dimensions 

Dimensions in inches 
(millimeters) 

 

 

3.80

(96.4)

4.45

(113.1)

1.68

(42.8)

TH0495R2

 

 

 

Figure 7.  RAB20… Unit. 

1.18

(30)

0.66

(16.9)

2.56 (65)

1.97 (50)

0.51 (13)

2.56

(65)

0.51

(13)

1.18

(30)

1.38

(35)

0.46

(11.8)

1.00

(25.5)

3.9

(99)

3.38
(86)

Ø 0.14 (3.6)

Ø 0.25 (6.4)

TH0496R2

Figure 8.  Base Plate. 

 

0.91(23) 0.91(23)

0.91(23)

0.91(23)

1.64(41.75)

1.64(41.75)

4.72(120)

4.72(120)

TH0512R1

3.29(83.5)

 

0.33(8.5)

1.1(28)

1.1(28)

1.17(29.6) 1.1(28)

1.18(30)

1.18(30)

0.04(1)

1.1(28)

1.1(28)

4.21(107)

4.21(107)

TH0513R1

 

 

Figure 9.  ARG70. 

 

 

 

Document No. 155-526P25 

Country of Origin:  US 

Page 9 

 

Summary of Contents for RAB20 Series

Page 1: ...ting voltage Two mounting styles electrical wall box or drywall Wall plate adapter ARG70 included with electrical wall box mount styles Application The RAB20 is used in heating or cooling systems with external automatic changeover devices aquastats to maintain the selected room temperature Typically used in commercial high rise and light industrial buildings in conjunction with Fans Zone valves Th...

Page 2: ...alve Auto Fan is switched with the heating valve Ventilation When the ventilation function is selected on the RAB20 1 only the heating and cooling contacts are always open and the fan works at the selected speed Changeover Heating cooling changeover is automatic based on room temperature Changeover is achieved externally using an SPDT aqua sensor not included wired between Terminals W Y and the zo...

Page 3: ...Off Weight 5 oz 0 14 kg Dimensions 3 80 4 45 1 68 inches 96 4 113 1 42 8 mm Color Ivory white with gray selector knobs Ambient Conditions Operation Temperature 32 F to 122 F 0 C to 50 C Relative humidity 95 Transport Storage Temperature 4 F to 122 F 20 C to 50 C Relative humidity 95 Wiring Screw terminals for wires of 2 16 AWG or 1 14 AWG minimum 20 AWG Housing Material Plastic Enclosure rating NE...

Page 4: ...st be de energized and the operating voltage checked before opening An ARG70 wall plate adapter provided with electrical wall box mount models must be used to mount to a 2 4 inch or 4 4 inch electrical wall box An ARG70 wall plate adapter must be used to meet UL and cUL requirements The thermostat must be mounted on a flat wall All local electrical regulations must be complied with If there are th...

Page 5: ...ion sensitive 10 Pull the wiring through the sub base 11 Position thermostat housing over the two mounting lugs located at the top of the sub base and press down on cover until bottom lugs snap in place 12 Terminate wires per wiring instructions on the inside of thermostat cover Optional To set limit stops remove gray tabs located on the setpoint knob and position high and low stops around perimet...

Page 6: ...hermostat base and push up to remove cover 3 Using the four screws provided fasten wall box adapter 3 to plaster ring 2 supplied by others 4 Pull wires through plaster ring 2 5 Flex adapter mask 4 and snap in place inside wall box adapter 3 6 Fasten sub base 5 included with thermostat to wall box adapter assembly 3 and 4 with the two screws provided 7 Follow Drywall Mounting Steps 7 through 16 The...

Page 7: ...rom the thermostat base and push up to remove cover 3 Using the two screws provided fasten wall box adapter 3 to plaster ring 2 supplied by others 4 Pull wires through plaster ring 2 5 Flex adapter mask 4 and snap in place inside wall box adapter 3 6 Fasten sub base 5 included with thermostat to wall box adapter assembly 3 and 4 with the two screws provided 7 Follow Drywall Mounting Steps 7 throug...

Page 8: ...S N1 G3 TH0508R3 Y I II III G2 G1 L ZV W AS Aqua sensor by others G1 Control output fan speed I Low G2 Control output fan speed II Medium G3 Control output fan speed III High L Operating voltage M1 3 speed fan N Neutral N1 Room thermostat W Valve output heating Y Valve output cooling ZV Zone valve Figure 5 Wiring W T F ON OFF SP SD TH0488R3 Heating Mode Y T F ON OFF SP SD TH0489R2 Cooling Mode SD ...

Page 9: ...lo Grove IL 60089 4513 U S A Your feedback is important to us If you have comments about this document please send them to SBT_technical editor us sbt siemens com Dimensions Dimensions in inches millimeters 3 80 96 4 4 45 113 1 1 68 42 8 TH0495R2 Figure 7 RAB20 Unit 1 18 30 0 66 16 9 2 56 65 1 9 7 5 0 0 5 1 1 3 2 56 65 0 51 13 1 18 30 1 38 35 0 46 11 8 1 00 25 5 3 9 99 3 38 86 Ø 0 14 3 6 Ø 0 25 6 ...

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