Description
AQA therm HES is our latest heating system water treatment module that is used in conjunction with filter cartridges such as SRC to treat the water that enters your heating system.
Description of functions AQA therm HFB 1717 BA
The AQA therm HFB-1717 BA comprises a backflow preventer, pressure reducer and shut-off ball valves and is designed to provide a secure, standardised connection between the heating system and the drinking water supply. The integrated backflow preventer and pressure reducer must be used to connect the heating system permanently to the drinking water system, allowing the heating system to be refilled at any time.
The BA-installed AQA therm HES, which is installed immediately after the AQA therm HFB-1717, comprises a water meter, a docking point for optional softening cartridges (AQA therm HRC) or desalination cartridges (SRC), an integrated shut-off ball valve and a distilled water filling point (warning: non-potable water!). This is used for softening/desalination and
Function of the backflow preventer (AQA therm HFB-1717 BA)
The backflow preventer is a back-up valve compliant with DIN EN 1717 and prevents the back pressure, backflow and return of polluted water into the supply line, into external systems or other system components. The backflow preventer is divided into three chambers (inlet, intermediate and outlet pressure chamber). If no water is drawn, the backflow preventer remains in idle mode under operating pressure. The inlet- and outlet-side backflow preventers and the drain valve are closed. When water is drawn, the backflow preventer is in the flow rate setting. The inlet- and outlet-side backflow preventers are opened and the drain valve is closed. If the differential pressure between the inlet pressure and intermediate pressure chamber falls below 0.14 bar, the backflow preventer moves into the isolated position (return). The backflow preventer on the inlet side closes and the drain valve opens.
Function of the pressure reducer (AQA therm HFB-1717 BA)
The pressure reducer reduces the inlet-side pressure (inlet pressure) at the required pressure on the outlet side (outlet pressure). The pressure reducer operates on the force-balance principle. The diaphragm force pushes against the spring force of the control valve. If the outlet pressure decreases when water is drawn, and with it the diaphragm force, a stronger spring force, then opens the valve. The outlet pressure continues to rise until a state of equilibrium is reached between the diaphragm and spring force. Inlet pressure has no effect on the control valve in the pressure reducer. Pressure fluctuations on the inlet side do not affect the outlet pressure (inlet pressure compensation). The AQA therm HFB-1717 BA can be permanently 6 EN connected to the drinking water supply by a hose or pipe in accordance with DIN EN 1717 (plastics and drinking water (German: KTW)) approval required for the hose).
After filling, the shut-off device must be activated to prevent uncontrolled refilling of the heating system.
Function of the AQA therm HES
The BA-installed AQA therm HES, which is installed immediately after the AQA therm HFB-1717, comprises a water meter, a docking point for an optional softening cartridge (AQA therm HRC) or desalination cartridge (SRC), an integrated shut-off ball valve and a distilled water filling point (warning: non-potable water!). This is used for softening/desalination and to register the flushing, filling and refilling volumes. AQA therm HES works either with the AQA therm HRC/hardness-reducing cartridge, using the ion exchange principle (whereby alkaline earth metals found in the water, like calcium and magnesium, are replaced with sodium ions), or with the SRC/desalination cartridge (reduces both calcifying and corrosive substances in the water).
Desalination without additives is preferred. The integrated ‘smart’ electrical water meter enables users to register the flushing, filling and refilling volumes at all times.
Scope of delivery
The AQA therm HFB-1717 BA comprises:
- Integrated shut-off ball valve on both the inlet and outlet sides.
- BA type backflow preventer with drainage connection, backflow preventer core, integrated filter on the inlet side, backflow preventer on the outlet side and three metering points with sealing plugs.
- Pressure reducer with pressure gauge
- Insulating shell
The AQA therm HES comprises:
- Water meter on the inlet side with digital display and electronics for configuring the water data and controlling the cartridge capacity.
- Vent or release valve: distilled water filling point (non-potable water!)
- Shut-off ball valve on the outlet side
- Insulating shell
- Dummy plug/flushing plug
Application
AQA therm HFB-1717 BA
- Medium | Water
- Inlet pressure | max. 10.0 bar
- Outlet pressure | adjustable from 1.5–4 bar; preset to 1.5 bar
- Liquid category backflow preventer BA | 4 (toxic, extremely toxic, carcinogenic, radioactive materials)
AQA therm HES
- Medium | Water
- Inlet pressure | max. 4 bar
Technical data
AQA therm HFB-1717 BA
- Mounting position | Horizontal with drainage connection directed downwards
- Operating temperature | max. 65 °C
- Pressure reducer, Ball valve connection, Backflow preventer | G 1/4“
- Drainage connection | HT 40
- Connection size | ½” external thread
AQA therm HES
- Mounting position | horizontal with cartridge directed downwards, cartridge optional
- Operating temperature | Feed water max. 30 °; device temperature max. 50 °C with shut-off ball valve (closed) using the heating system’s temperature transfer; ambient temperature max. 40 °C
- Connection size | 1/2“
Downloads
AQA therm HFB-1717 BA | HES | HWG Installation and operating instructions ENG
