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RDX42.22U
Room Temperature Controller
with LCD
Description
Features
Application
Product Number
Accessories
Ordering
Controller for heat pump systems with reversing valve, optional electric heater, one- or
two-stage heating and one-stage cooling.
• Outputs for one-stage compressor and reversing valve or on/off valve actuators
• Output for auxiliary electric heating
• Output for a one-speed fan
• Room or return air temperature control
• Manual heating/cooling changeover
• Operating modes: Normal (heating, cooling), Energy Saving, Off
• Operating mode changeover input for remote control
• Selectable installation and control parameters
• Operating voltage 24 Vac
• For control of heat pump systems with reversing valve, optional electric heater, one-
or two-stage heating and one-stage cooling
• For control of room temperature in individual rooms that are heated or cooled with
four-pipe fan coil units and optional electric heating
• For opening and closing a valve
• For switching a one-speed fan
RDX42.22U
ARG70
Adapter Plate for 4 × 4-inch conduit boxes
QAH11.1
Changeover/Remote Temperature Sensor
141-570
Lockable Thermostat Guard
The QAH11.1 temperature sensor (can also be used as a return air temperature
sensor) and the zone valves must be ordered separately.
Technical Instructions
Document No. 155-747
March 13, 2008
Siemens Industry, Inc.
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Summary of Contents for Siemens RDX42.22U
- Page 1 Adapter Plate for 4 × 4-inch conduit boxes QAH11.1 Changeover/Remote Temperature Sensor 141-570 Lockable Thermostat Guard Ordering The QAH11.1 temperature sensor (can also be used as a return air temperature sensor) and the zone valves must be ordered separately. Siemens Industry, Inc.
- Page 2 Technical Instructions RDX42.22U Room Temperature Controller with LCD Document Number 155-747 March 13, 2008 Table 1 Equipment Combinations. Product Number Description Technical Instructions SFA/SFP Series Zone valve actuators 155-321P25 599 Series Zone Valves Zone valve bodies 155-320P25 155-187P25 GDE16… 44 lb-in NSR air damper actuators GLB16…...
- Page 3 Parameters). Return air temperature The RDX42.22U provides control based on room temperature or return air temperature. It detects if a QAH11.1 cable temperature sensor is connected to input terminals 9 and 8, and then operates automatically according to the return air temperature.
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Page 4: Operating Modes
Technical Instructions RDX42.22U Room Temperature Controller with LCD Document Number 155-747 March 13, 2008 Operating Modes The following operating modes are available: Normal Heating or cooling mode with selected fan operation (Auto or continuous on). In Normal operation, the controller maintains the adjusted setpoint. (See Operation Diagram). - Page 5 RDX42.22U Room Temperature Controller with LCD Technical Instructions Document Number 155-747 March 13, 2008 Setting and Operating Elements Figure 2. Display of the room temperature (in degrees Fahrenheit or Celsius), setpoints or control parameters Symbol used when displaying the current room temperature...
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Page 6: Setting The Control Parameters
Technical Instructions RDX42.22U Room Temperature Controller with LCD Document Number 155-747 March 13, 2008 Setting the A number of control parameters can be set to optimize the control performance. These Control parameters can also be set during operation without opening the unit. In the event of power failure, all control parameter settings set will be maintained. - Page 7 RDX42.22U Room Temperature Controller with LCD Technical Instructions Document Number 155-747 March 13, 2008 Table 3. Control Parameters. Parameter Meaning Setting Range Factory Setting Heating setpoint in Energy Saving 61°F (16°C) OFF, 46°F to 64.5°F (8°C to 18°C) (in mode (operating mode changeover increments of 1°F)
- Page 8 Technical Instructions RDX42.22U Room Temperature Controller with LCD Document Number 155-747 March 13, 2008 • Check the position of the DIP switches and change them, if necessary. Mounting, Installation and • After applying power, the controller makes a reset, which takes approximately three Commissioning seconds;...
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Page 9: Specifications
RDX42.22U Room Temperature Controller with LCD Technical Instructions Document Number 155-747 March 13, 2008 Operating voltage 24 Vac + 20% Specifications Frequency 50/60 Hz Power Supply Power consumption Maximum 6 VA Control output FAN 24 Vac Rating Maximum 5(3)A Control outputs COOLING and HEATING... -
Page 10: Wiring Terminals
Technical Instructions RDX42.22U Room Temperature Controller with LCD Document Number 155-747 March 13, 2008 1,2,3 Operating voltage, 24 Vac Neg Wiring Terminals Operating voltage, 24 Vac Pos Cooling output, NO contact Cooling output, NC contact Auxiliary heating output Measuring neutral remote sensor Remote temperature sensor (QAH11.1) - Page 11 March 13, 2008 Dimensions Figure 8. RDX42.22U Dimensions in Inches (mm). 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. Product or company names mentioned herein may be the trademarks of their respective owners.