User Manual

ManualsBrandsSiemens ManualsHeating controllerRoom unit QAA73.210

CE1Q2283en

2018-02-22

Building Technologies

OEM

Room Unit for Boiler

Temperature Control

QAA73.210

With OpenTherm interface

∂ Digital, multifunctional room unit for functional enhancement of boiler con-

trollers

∂ With integrated room temperature sensor, heating program and a number

of control functions

Use

Used in combination with boiler or heating controller.

Room temperature control in:

∂ Single or 2-family houses

∂ Smaller multifamily houses

∂ Holiday houses and villas

For use in all standard heating systems, such as radiator or convector heating sys-

tems. Especially suited for heating plants with pump heating circuits. If the boiler

control systems feature integrated mixing valve control, it is also possible to control

mixing heating circuits.

The room units are designed for the OEM market. They are supplied directly to the

boiler manufacturer and enhance the functionality and the level of control of small

gas-fired appliances with integrated boiler temperature controllers.

Use

Application

Market

Summary of content (6 pages)

PAGE 1
s Room Unit for Boiler Temperature Control OEM QAA73.210 With OpenTherm interface ∂ Digital, multifunctional room unit for functional enhancement of boiler controllers ∂ With integrated room temperature sensor, heating program and a number of control functions Use Use Used in combination with boiler or heating controller.
PAGE 2
Functions Control functions ∂ Calculation of flow temperature setpoint ∂ Pure room temperature control ∂ Weather-compensated flow temperature control while giving consideration to the building’s thermal dynamics ∂ Weather-compensated flow temperature control with room compensation ∂ Effect of room temperature deviation can be adjusted ∂ ECO functions (24-hour limit switch, automatic summer / winter changeover) ∂ Quick setback ∂ Room temperature switching differential for limiting the room temperature ∂ Adj
PAGE 3
Mechanical design Room unit The unit consists of the following components: ∂ Front housing with integrated electronics and operating elements ∂ Back housing with the connection terminals for wall mounting Operating elements ∂ ∂ ∂ ∂ ∂ ∂ Button for selecting the heating operating mode + / - buttons knob for adjusting the heating setpoint Button for selecting the DHW operating mode + / - buttons knob for adjusting the DHW setpoint Info button Occupancy button for temporary changeover Display Notes Dispos
PAGE 4
Engineering ∂ In the main living room or reference room ∂ The place of installation should be chosen so that the sensor can capture the room temperature as accurately as possible, without being affected by direct solar radiation or other heating or cooling sources ∂ Mounting height is about 1.5 meters above the floor ∂ The unit can be fitted to most commercially available recessed conduit boxes or directly on the wall Mounting (wall) Open the unit at the bottom and remove the base from the housing front.
PAGE 5
Technical data Power supply, interface Room temperature measurement OpenTherm Bus Terminals Cable length Cable resistance Power consumption 2-wire, interchangeable max. 50 m max. 2 x 5 Ω 20 mW (typically) Measuring range According to EN12098: Range 15...25 °C Range 0..15 °C or 25...50 °C Resolution 0...
PAGE 6
Diagrams Connection diagram 1 2 1 2 COA COB OpenTherm terminal A (interchangeable) OpenTherm terminal B (interchangeable) 23 mA max Regulations for installation The local regulations for electrical installations must be complied with. Dimensions Room unit External dimensions: 130 x 86 x 31 mm Panel cutout For special applications it is possible to integrate the device in the boiler panel. Dimensions of cut-out The controller’s mounting dimensions are 81.5 x 125.5 mm.