SIEMENS Climatix ™ S400 STD HVAC Controller (POS646 Series)

Selection and Accessories

1. Selection of Expansion Modules

Module Type Model Description Document ID

I/O expansion module POL966.10/STN PCB type, expansion I/O A6V14168067

I/O expansion module POL966.00/STN HSG type, expanding I/O A6V14168067

I/O expansion module (with ECV) POL95E.00/STN HSG type, 13 I/O+1 ECV A6V11977562

Communication Extension (OpenTherm) POL935.10/STN PCB Type, OpenTherm Communication A6V14064329

Communication Expansion (M-Bus) POL937.00/STN HSG Type, M-Bus Communication A6V14669764

Note: The expansion module needs to be connected to a Board to Board connector (POL001.45/STD) or a Board to Connector (POL002.43/STD). If the power supply to the controller is insufficient, an external 24V power supply (such as POL0B5.55/STD, 75W) is required.

2. Key attachments

Room units and sensors:

Type, Model, Description, Communication Method

Touch room unit POL824.40/STD is used for user operation of Modbus

Outdoor temperature sensor QAC34 NTC 1k-

Immersion temperature sensor QAE16 PT100/1000-

HMI devices:

Type, Model, Description, Communication Method

Text HMI (TM) POL871. RJ45 interface HMI Bus Modbus FT1.2

Touch HMI (7 inches) POL8T2.70/STD RJ45/Ethernet HMI Bus Modbus FT1.2

Other attachments:

WLAN stick: POL903.00/100 (USB-A interface, requires conversion to C adapter, used for smartHMI connection);

External power supply: POL0B5.55/STD (24V DC/75W, supplying power to the expansion module);

Terminal connectors: Phoenix/Dinkle brand, such as POL001.45/STD (board to board), POL002.43/STD (board to wire), need to be ordered separately (MOQ 100 pieces).

Installation and safety regulations

Installation requirements

Space requirements: A gap should be reserved around the controller (Ethernet/USB-C end ≥ 30mm, I/O expansion module end ≥ 40mm);

Fixing method: fix with M3.5 metal screws (head diameter ≤ 8mm, not included in the supply);

Cable requirements: Different interface cables have a maximum length limit (such as Ethernet ≤ 100m, RS485 ≤ 1000m, LINbus ≤ 3m), and shielding is required for cables exceeding 3m.

Safety Warning

No internal fuses: All AC 230V circuits require external overcurrent protection (≤ 10A), with a total current not exceeding 10A;

Anti electric shock: AC 230V and SELV (Safety Extra Low Voltage) cables need to be double insulated, and the power supply should be disconnected before plugging or unplugging the terminals;

Anti static: When touching the PCB board, wear an anti-static wristband and and clothing to avoid direct contact with the components.

Maintenance and Disposal

Maintenance: The controller is designed to be maintenance free and does not require regular maintenance;

Disposal: Products and packaging cannot be used as household waste and must be classified and recycled according to local regulations. All personal data must be deleted before recycling.