Thermostatic Element Danfoss AB-QM (DWZ) – spare thermostatic cartridge, MPN 003Z0384

The Danfoss AB-QM (DWZ) thermostatic element is a spare thermostatic cartridge designed for use with Danfoss AB-QM actuators and compatible valve bodies. It senses temperature changes and actuates the valve to regulate flow in heating and cooling circuits. Supplied as a replacement component, this cartridge restores thermostatic control where the original element is worn or malfunctioning and supports continued operation of commercial and residential HVAC installations.

Advantages

This thermostatic element offers precise temperature sensing and reliable actuation compatible with AB-QM style actuators. Its design enables straightforward replacement of worn cartridges without the need to change the entire valve assembly, reducing maintenance time and cost. The spare cartridge is manufactured to suit common hydraulic balancing and control applications, ensuring predictable behavior and durable performance under normal operating conditions.

Suitable for

• Replacement of worn or faulty thermostatic cartridges in AB-QM compatible valves
• Maintenance and repair work in commercial HVAC systems
• Residential radiator and underfloor heating valve maintenance
• Hydronic balancing projects requiring restored thermostatic control

Key specifications

• Function: Thermostatic sensing and valve actuation cartridge
• Compatibility: Designed for use with AB-QM type actuators and compatible valve bodies
• Application: Heating and cooling hydraulic circuits in HVAC systems
• Form factor: Replaceable cartridge for in-line valve installation
• Environment: Indoor installation in commercial and residential systems

How to use

Shut down the system and isolate the valve before attempting replacement. Remove the actuator from the valve body according to the valve manufacturer's instructions, then extract the old thermostatic cartridge. Insert the replacement cartridge into the valve seat, ensuring correct orientation and seating. Refit the actuator and restore system pressure, then check for proper valve movement and temperature regulation. Follow local safety procedures and, if required, consult a qualified HVAC technician for installation.

Usage recommendations

Perform the replacement during scheduled maintenance or when temperature control is inconsistent. Verify compatibility with the specific AB-QM actuator model before installation and test the system after fitting the cartridge to confirm correct operation.