Siemens RAB10.1U, RAB30.1U, RAB20.1U, RAB90.1U Tech Tips
Electric Fan Coil Thermostats
RAB…
RAB10.1U Thermostat with
manual changeover.
RAB20.1U Thermostat with
exposed setpoint knob and
external changeover.
Description
Designed to control 2- or 4-pipe fan coil or unit ventilators,
the RAB… Electric Fan Coil Thermostats are an attractive
and economical solution that utilize two-wire, gas
membrane technology.
Providing On/Off control, the RAB… Electric Fan Coil
Thermostats are available with dual scale Fahrenheit/
Celsius models with manual or external changeover.
The RAB20.1U requires an aqua sensor to initiate
changeover.
Features
• Fan Speed Switch (RAB90.1U) for remote switching
location (24...277 Vac)
• Two-point control algorithm for on/off control
• Line voltage
• 2-pipe or 4-pipe fan coil applications
• 3-speed fan control
• Fan on only models for ventilation
• Manual or external changeover
• Two mounting styles: electrical wall box or drywall
• Adjustable upper/lower limit stops
• Dual Fahrenheit/Celsius scale
RAB30.1U Thermostat with
exposed setpoint knob and
3-speed fan control.
RAB90.1U 3-speed
fan switch.
Applications
The RAB… Electric Fan Coil Thermostats are
recommended for applications in commercial or light
industrial buildings in conjunction with zone valves,
thermal valves, fans or thermostats.
Note:
ARG70, wall plate, is required for UL compliance in
switching line voltage.
A-37
Thermostats
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Specifi cations/Product Ordering
A-38
Operating Voltage ........................................................ 24…120, 277 Vac
Frequency ..............................................................................50 or 60 Hz
Setpoint Setting Range ....................................... 50 to 85°F (8 to 30 °C)
Switching Differential (SD) ................................................. <1.8°F (1°C)
Switch Rating ............................................... 6 A resistive, 3.5 A inductive,
Time Constant ...............................................................................14 min.
Operating Conditions
Temperature ...............................................14 to 122°F (-10 to +50 °C)
Relative Humidity ...................................................................<95% RH
Transportation Conditions
Temperature ..............................................-4 to +122°F (-20 to +50 °C)
Relative Humidity ...................................................................<95% RH
3-speed
Change- Vent- Fan Electric Wall
Application over ilation Control Switch Box1 Dry Wall
2-pipe Heating/Cooling/Ventilation Manual Yes Yes Heat/Cool/Vent RAB10.1UW RAB10.1U
RAB…
2-pipe Heating/Cooling/Ventilation Auto Yes Yes Heat/Cool/Vent RAB20.1UW RAB20.1U
4-pipe Heating/Cooling/Ventilation Manual Yes Yes Heat/Cool/Vent RAB30.1UW RAB30.1U
— 3-speed Fan Switch — — Yes — — RAB90.1U
Ordering Note
1. Includes wallplate, ARG70, to be UL compliant for switching line voltage.
3.5 FLA, 12 LRA
Description
Safety ............................................................................................. UL 873
Wiring ..........................................................Screw Terminals for Wires of
2 x 16 or 1 x 14 AWG, 20 AWG max.
Cover Color ..................................................................................... White
Shipping Weight ........................................................... 0.08 lb. (0.18 kg)
Accessories
& Service Kits
Part Nos.
A-77
Thermostats
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Dimensions
RAB... Room Thermostat and Wall Plate for Mounting
(RAB10.1U, RAB20.1U and RAB30.1U)
A-39
3.80
TH0721R1
(96.4)
Wall Plate (ARG70) for Mounting
RAB90.1U and Wall Plate for Mounting
3.92
(99.6)
1.53
(38.9)
(30)
1.181.18
(30)
TH0491R2
1.101.10
(28)
(28)
3.39
(86)
1.18 1.18
(30)
1.10
(28)
(30)
0.14
(3.6)
1.10
(28)
3.39
Thermostats
(86)
Dimensions shown in inches (mm).
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Engineering Drawings
Wiring Diagrams
A-40
Thermostats
RAB10.1U...
Key
L Operating Voltage
M1 3-speed Fan
N Neutral
N1 Room Thermostat
Heating Mode
RAB20.1U...
G1 Control Output Fan Speed I
G2 Control Output Fan Speed II
G3 Control Output Fan Speed III
Operating Diagrams
RAB30.1U...
ZV Zone or Thermal Valve
W/Y Control Output Actuator
AS Aqua Sensor
Cooling Mode
Key
T Room Temperature
SD Switching Differential
SP Room Temperature Setpoint
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W Valve Output Signal Heating
Y Valve Output Signal Cooling
Room Temperature Controllers
for Two-pipe Fan Coil Units
RCC…
RCC20U Room Temperature Controller.RCC10U Room Temperature Controller.
Description
The RCC... Room Temperature Controllers are room
temperature controllers for two-pipe fan coil units.
Features
RCC10U
• Output for on/off valve actuator
• Output for three-speed fan
• Dual setpoint temperature scale
• Control depending on the room or return air
temperature
• Automatic Heating/Cooling changeover
• Operating modes: Normal, Energy Saving, Frost
Protection and Off
• Operating mode changeover input for remote control
• Selectable control parameters
RCC20U
• Outputs for on/off valve actuator and electrical heater.
• Output for three-speed fan.
• Dual setpoint temperature scale.
• Control depending on the room or return air
temperature (remote sensing).
• Automatic Heating/Cooling changeover.
• Operating modes: Normal, Energy Saving, Frost
Protection and Off.
• Operating mode changeover input for remote control.
• Selectable control parameters.
Applications
The RCC... Series of Room Temperature Controllers
are typically used for:
• Controlling Normally Open (NO) 120 Vac,
two-position valves.
• Controlling room temperature in individual rooms that
are heated or cooled with two-pipe fan coil units.
• Switching an electrical heater (RCC20U).
• Operating a 3-speed fan.
The RCC... Series is suitable for systems with:
• Automatic Heating/Cooling changeover.
• Heating only/Cooling only or Heating and Cooling
applications.
A-41
Thermostats
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Specifi cations/Product Ordering
A-42
Operating Voltage .........................................................................120 Vac
Frequency ................................................................................... 50/60 Hz
Power Consumption ..........................................................Maximum 4 VA
Control Outputs (Fan) 11, 10, 9 ...120 Vac max./3A res./3.5 FLA/7.0 LRA
Control Output 3 ..................................................................... 0 to 10 Vdc
Resolution .................................................................................... 39 mV
Current ......................................................................................... ±1 mA
Signal Input 2 for Changeover Sensor ......................QAH11.1, Class 2,
Permissible Number of Thermostats ........ Ten in Parallel, Signal Input 3
Status Input D1 and GND
Contact Sensing ................................................... 6 to 15 Vdc/3 to 6 mA
Insulation against live voltage ......................................................... 4 kV
Operating Action ......................................................Normally Open (NO)
Permissible Cable Length with Copper
Cable 16 AWG for Connection to Signal Input 2,
D1, and GND ....................................................................... 262 feet (80m)
Setpoint Setting Range ....................................... 50 to 85°F (10 to 30°C)
Description Part No.
Two-pipe fan coil unit controller,
on/off output RCC10U
RCC...
Two-pipe fan coil unit controller with
additional electric heat; on/off output RCC20U
NTC resistor 3K Ω at 77°F (25°C)
Setpoint (Energy Saving Mode), Heating ............................ 61°F (16°C)
Setpoint (Energy Saving Mode), Cooling ............................ 82°F (28°C)
Operation
Temperature ...................................................... 32 to 122°F (0 to 50°C)
Humidity .................................................................................. <95% RH
Shipping and Storage
Temperature ............................................ –13 to +158°F (–25 to +70°C)
Humidity .................................................................................. <95% RH
Agency Approvals ......................................................................... UL 873
Certifi cation C22.2 No. 24-93
Conforms to CE Requirements
Connection Terminals .............. Solid Wires or Prepared Standard Wires
2 X16 AWG or 1 X14 AWG
Minimum 20 AWG
Housing Color
Cover .............................................................................. White and gray
Base ...............................................................................................Gray
Degree of Housing Protection .................................................... NEMA 1
Shipping Weight .............................................................. 0.5 lb. (0.23 kg)
cUL
Accessories
& Service Kits
A-77
Dimensions
Thermostats
RCC10U/20U Controller
1.38
1.10
(35)
(28)
1.18
1.10
(30)
(28)
0.46
(11.8)
TH0613R1
Dimensions are shown in inches (mm).
Baseplate
0.16 (4)
1.10
(28)
1.02
(26)
3.54
(90)
1.10
(28)
0.16
(4)
4.09
(104)
0.16 (4)
1.18
(30)
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Free Energy Band™ Room Temperature
Controller for Four-pipe Fan Coil Units
RCC…
RCC30U Room Temperature Controller.
Description
The RCC... Free Energy Band Room Temperature
Controllers are room temperature controls for four-pipe fan
coil units.
Features
• Outputs for on/off valve actuators
• Outputs for three-speed fan
• Dual setpoint temperature scale
• Control depending on the room or return air
temperature (remote sensing)
• Automatic Heating/Cooling changeover
• Operating modes: Normal, Energy Saving, Freeze
Protection and Off
• Operating mode changeover input for remote control
• Selectable control parameters
• Free Energy Band between Heating and Cooling for
energy conservation
Applications
The RCC... Series is typically used for the following
applications:
• Controlling room temperature in individual rooms that
are heated or cooled with four-pipe fan coil units.
• Opening or closing a Normally Closed (NC) Heating
and a Normally Open (NO) Cooling, 120 Vac, twoposition valve.
• Switching a three-speed fan.
A-43
Thermostats
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Specifi cations/Product Ordering
A-44
Operating Voltage ........................................................ 120 Vac +10/-15%
Frequency ................................................................................... 50/60 Hz
Power Consumption ...........................................................Maximum 10A
Control Outputs (Fan) 12, 11, 10
7 and 9 ....................................................................120 Vac max./3A res./
3.5 FLA/7.0 LRA
120 Vac max./3A res./3.5 FLA/7.0 LRA
Control Output 5 (Common) ..................................120 Vac/7A maximum
Signal Input 1 for Return Air Sensor ..........................QAH11.1, Class 2
NTC resistor 3K @ 77°F (25°C)
Operating Action .............................................. Single-pole, Single-throw
Permissible Cable Length with Copper
Cable 16 AWG for Connection to
Terminals 1, D1, and GND ................................................ 262 feet (80 m)
Setpoint Setting Range ....................................... 50 to 85°F (10 to 30°C)
Maximum Control Deviation at 72°F (22°C) ..... Maximum ±1.5°F (0.7°C)
Switching Differential in Heating Mode SDH
(Selectable) ..................................................................2 or 7°F (1 or 4°C)
Switching Differential in Cooling Mode SDC ..........................1 or 3.5°F
(0.5 or 2°C) (selectable)
Dead Zone in Normal Operation .............................. 3.5 or 9°F (2 or 5°C)
Description Part No.
Free Energy Band™ Four-pipe Fan
Coil Controller RCC30U
RCC... FEB
Setpoint (Energy Saving mode), Heating ............................ 61°F (16°C)
Setpoint (Energy Saving mode), Cooling ............................ 82°F (28°C)
Setpoint (Freeze Protection) .................................................. 46°F (8°C)
Operation
Temperature ...................................................... 32 to 122°F (0 to 50°C)
Humidity .................................................................................. <95% RH
Shipping and Storage
Temperature ..............................................-13 to +158°F (-25 to +70°C)
Humidity .................................................................................. <95% RH
Agency Approvals
UL Listing ....................................................................................UL 873
cUL
Certifi cation C22.2 No. 24-93
Conforms to CE requirements
Connection Terminals ................. Solid wires or prepared standard wires
2 X16 AWG or 1 X14 AWG
Minimum 20 AWG
Housing Color
Cover ............................................................................. White and gray
Base ...............................................................................................Gray
Degree of Housing Protection .................................................... NEMA 1
Shipping Weight ............................................................... 0.5 lb (0.23 kg)
Accessories
& Service Kits
A-77
Thermostats
www.usa.siemens.com/hvaccomponents
Dimensions
RCC30U FEB Controller
4.49
(114.15)
TH0612R1
1.38
(35)
1.18
(30)
1.10
(28)
1.10
(28)
3.80
(96.6)
Baseplate
0.16 (4)
1.10
(28)
1.88
(48)
A-45
Thermostats
1.10
(28)
0.16
(4)
4.09
(104)
0.46
(11.8)
TH0613R1
0.16 (4)
1.02
(26)
Dimensions shown in inches (mm).
3.54
(90)
1.18
(30)
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A-46
Thermostats
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Room Temperature Controllers
for CAV Systems
RCU15/50…
RCU15U/RCU50U
Room Temperature Controller.
Description
The RCU15/50… Series microprocessor controlled CAV
room controllers are designed for air only, or air and water
heating and/or cooling systems. Controllers have
two-position, pulse width modulation (PWM), or
proportional response.
Features
• 0 to 10 Vdc output for heating or cooling (RCU50U and
RCU50.2U)
• ON/OFF or PWM outputs for heating and cooling
(RCU15U)
• Control depending on room or return air temperature
(RCU15U)
• Automatic heating/cooling changeover (RCU15U and
RCU50U)
• Manual heating/cooling changeover (RCU50.2U)
• Operating modes: Normal, Energy Saving, Freeze
Protection and Standby (RCU15U and RCU50U)
• Operating modes: Normal and OFF (RCU50.2U)
• Active 0 to 10 Vdc input for setpoint shifting (RCU50U)
• Operating mode changeover input for remote control
(RCU50U)
• Adjustable minimum limitation for cooling output
(RCU50U)
• Operating voltage 24 Vac
RCU50.2U Room Temperature Sensor with
manual heating/cooling changeover switch.
Applications
Controlling individual room temperature in HVAC
installations that are heated or cooled.
Controlling these types of equipment:
• Valve actuators
• Air damper actuators
A-47
Thermostats
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Specifi cations/Product Ordering
A-48
Power Supply
Operating Voltage ............................................................. 24 Vac ±20%
Frequency ................................................................................ 50/60 Hz
Setpoint Setting Range ...................................... 50 to 85°F (10 to 30°C)
P-band in Heating Mode
RCU50U .................................................................... 2 or 7°F (1 or 4°C)
RCU50.2U (fi xed) .................................................................... 7°F (4°C)
P-band in Cooling Mode
RCU50 ................................................................ 1 or 3.5°F (0.5 or 2°C)
RCU50.2 (fi xed) ................................................................... 3.5°F (2°C)
Setpoint (Energy Saving Mode), Heating ........................... 61°F (16°C)
Setpoint (Energy Saving Mode), Cooling ........................... 82°F (28°C)
Setpoint Freeze Protection ..................................................... 46°F (8°C)
Setpoint Shift Temperature @ 72°F (22°C) ............... +22.5°F (±12.5°C)
Control Action
RCU15U ............................................................................. On/Off/PWM
RCU50U & RCU50.2U ........................................................ Proportional
Control Outputs, Terminals 4 and 5 (RCU 50...)
Voltage ................................................................................. 0 to 10 Vdc
Current ......................................................................................... ±1 mA
Control Outputs, Terminals 7 and 8 (RCU15U) ........... PWM or ON/OFF
Voltage .............................................................................. 24 Vac ±20%
Current ................................................................................... 0.02 to 1A
Cycle time PWM (selectable for terminal 7) ...........................20s or 90s
Status Input D1 (RCU50U)
Contact sensing ................................................... 6 to 15 Vdc/3 to 6 mA
Insulation against live voltage ......................................................... 4 kV
Maximum number of contacts connected in a panel .......................... 50
Status Inputs 1 and 2 (RCU50U)
Setpoint shift of +22.5°F @ 72°F (22°C) .............................. 0 to 10 Vdc
Neutral position (no setpoint shift) ................................................. 5 Vdc
Signal Input Terminals 2 and 3
for Changeover Sensor ....................................... QAH11.1 safety class 2
NTC resistor 3KΩ @ 77°F (25°C)
Maximum Copper Cable Length 16 AWG
For Input Signal terminals 1 & 2 (RCU50U) .................... 262 feet (80m)
For Input Signal D1 (RCU50U) ....................................... 262 feet (80m)
Operation
Temperature ...................................................... 32 to 122°F (0 to 50°C)
Humidity .................................................................................. <95% RH
Shipping and Storage
Temperature ..................................................-13 to 158°F (-25 to 70°C)
Humidity .................................................................................. <95% RH
Agency Approvals .......................................................... UL listed UL 873
Conforms to CE requirements
cUL certifi ed to Canadian Standard C22.2 No. 24-93
Connection Terminals ....... Use Solid Wires or Prepared Stranded Wires
2 x 16 AWG or 1 x 14 AWG, 20 AWG max.
Housing Color
Cover ............................................................................................. White
Base ...............................................................................................Gray
Shipping Weight ............................................................... 0.5 lb (0.23 kg)
Heat/Cool Changeover Output(s) Part No.
Automatic (2) On/Off or PWM RCU15U
Automatic (1) 0 to 10 Vdc RCU50U
RCU15/50…
Manual (1) 0 to 10 Vdc RCU50.2U
Thermostats
Ordering Note: The temperature sensor, changeover mounting
kit, and valve and damper actuators must be ordered separately,
see table below.
Device Combinations
Description Part No.
Remote Cable
Temperature/Changeover Sensor QAH11.1
44 lb-in NSR Air Damper Actuator GDE16...
88 lb-in NSR Air Damper Actuator GLB16...
Valve Actuator SSB61U
Valve Actuator SSC61U
SSC61.5U
Valve Actuator SQS65U
SQS65.5U
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