Siemens QMX3.P34 Room Operator Unit – KNX Thermostat with LCD Display
Part Number: S55624-H105-A
Brand: Siemens Building Technologies
Overview
The Siemens QMX3.P34 is a wall-mounted KNX room operator unit designed for precise temperature control in commercial and residential HVAC systems. Featuring a built-in temperature sensor, segmented backlit LCD display, and touch-sensitive keys, this unit offers intuitive user interaction and seamless integration with Siemens DXR Series controllers via PL-Link communication.
Key Features & Benefits
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Integrated Temperature Sensor: Measures ambient temperature with an accuracy of ±0.36°F (±0.2°C) within the 32°F to 122°F (0°C to 50°C) range.
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User-Friendly Interface: Equipped with a full HMI LCD display and capacitive touch keys for easy operation.
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Energy Efficiency Indicators: Includes a “Green Leaf” LED to promote energy-saving practices.
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Advanced Control Options: Supports adjustable temperature control modes, including PWM and modulating control (PID algorithm), suitable for heating, cooling, or combined systems.
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Flexible Operating Modes: Allows switching between Comfort, Pre-Comfort, Energy Savings, and Protection modes via KNX or the display.
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Air Quality Management: Features adjustable setpoints for CO₂ concentration and relative humidity, with configurable switching values for air quality control.
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Fan Control Integration: Supports 1, 2, or 3-stage fan control and 1, 2, or 3-point positioning signals for humidity and CO₂ levels.
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Compact Design: Dimensions of 7″ x 5″ x 3″ (178 x 127 x 76 mm) and an IP30 protection rating make it suitable for various installation environments.
Technical Specifications
| Specification | Details |
|---|---|
| Voltage Supply | KNX Bus |
| Temperature Sensor | NTC |
| Measurement Range | 32°F to 122°F (0°C to 50°C) |
| Measurement Accuracy | ±0.36°F (±0.2°C) at 32°F (0°C) |
| Communication | KNX PL-Link, KNX S-Mode |
| Display | Segmented Backlit LCD |
| Housing Color | White |
| Degree of Protection | IP30 |
| Weight | 2 lbs (0.91 kg) |
| Dimensions | 7″ x 5″ x 3″ (178 x 127 x 76 mm) |
Applications
The QMX3.P34 is ideal for:
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HVAC Systems: Integration with Siemens DXR Series controllers for precise environmental control.
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Commercial Buildings: Offices, conference rooms, and other spaces requiring efficient climate management.
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Residential Applications: Smart home systems aiming for energy-efficient temperature regulation.
Why Choose Apex Controls?
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Expertise: Over 30 years of experience in HVAC and building automation solutions.
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Quality Assurance: Genuine Siemens products with full manufacturer support.
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Customer Satisfaction: Dedicated to providing exceptional service and support.
Related Products
Note: Ensure compatibility with your existing KNX system and consult with a professional installer for optimal setup.



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