Siemens RAA Series Technical Instructions

RAA Series

Technical Instructions

Room Thermostats

RAA20…

Description

Document No. 155-519P25

ET RAA-1

March 2, 2007

Two-wire, gas diaphragm-based room thermostats for use in heating and/or cooling
only (two-pipe) systems.

Features

Product Numbers
Accessory
Application

• Two-point control algorithm (on-off)

• 24 to 120 Vac, 277 Vac operating voltage

• Two mounting styles: electrical wall box or drywall

• Wall plate adapter (ARG70) included with electrical wall box mount styles

• Dual setpoint temperature scale (RAA20..) or tamperproof (concealed) setpoint

(RAA10…)

See Table 1.
ARG70 Wall box adapter
Typically used in:

• Schools

• Public buildings

• Storage rooms

• Maintenance rooms

• Temporary heat for building construction

Used in commercial and light industrial buildings in conjunction with:

• Zone valves

• Gas, fuel burners

• Fans

• Pumps

Siemens Industry, Inc.

Technical Instructions RAA Series Room Thermostats

contact is closed.

WARNING:

CAUTION:

Document Number 155-519P25
March 2, 2007

Table 1. Product Numbers.

Mounting Style Product

Number

Electrical Wall

Box (with wall

box adapter)

Drywall1 RAA10C Heating only or cooling only None Celsius (concealed)

RAA20U Heating only or cooling only None Fahrenheit and Celsius

Operation

Adjustments

RAA10CW Heating only or cooling only None Celsius (concealed)
RAA20UW Heating only or cooling only None Fahrenheit and Celsius

The room thermostat is based on a two-wire, gas membrane technology.
When the room temperature falls below the selected setpoint, the thermostat closes the

heating contact. If the room temperature is over the selected setpoint, the cooling

A rotating setpoint adjuster inside the thermostat can select the required temperature.

• RAA10… No adjustments can be made outside the thermostat. The cover must be
removed to adjust setpoint.

• RAA20… High and low setpoint limit stops can be engaged to limit temperature
range.

Warning/Caution Notations

Control Switch Scale

Personal injury, or loss of life may occur if
you do not perform a procedure as specified.

Specifications

Equipment damage, or loss of data may
occur if you do not follow a procedure as
specified.

Operating voltage 24 to 120 Vac, 277 Vac
Frequency 50/60 Hz
Setpoint adjustment range 50°F to 85°F (10°C to 30°C)
Setpoint limit stops are adjustable (except RAA10…)
Switching differential (SD) <1.8°F (1°C), fixed
Switch rating 6A RES, 3.5A FLA, 12A LRA
Switch action Single-Pole, Double-Throw (SPDT )
Output Two-position (On/Off)
Weight 5 oz. (0.14 kg)
Dimensions

RAA10… 3.80 × 3.92 × 1.42 inches
(96.4 × 99.6 × 36 mm)
RAA20… 3.80 × 3.92 × 1.68 inches
(96.4 × 99.6 × 42.8 mm)

Color Ivory white

Page 2 Siemens Industry, Inc.

RAA Series Room Thermostats Technical Instructions

Operation

Material Plastic

Screw terminals for wires of 2 × 16 AWG

Conforms to CE requirements

Document Number 155-519P25
March 2, 2007

Ambient Conditions

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%

Housing

Wiring

Agency Certification

SFA71U 24V NC
SFA11U 120V NC
SFA208U/25 208V NC
SFA277U/25 277V NC
STA71 24V NC 155-709
599 Series Zone

Valves

Enclosure rating NEMA1
Bellows Environmentally-f riend l y gas

or 1 × 14 AWG
minimum 20 AWG

UL listed to 873 (E35918)
cUL listed to Canadian standard
C22.2 No. 24-93

Table 2. Control Valves.

Part Number Description Technical Instructions

155-321P25

Two-way

Three-way

155-320P25

Siemens Industry, Inc. Page 3