T 2178 EN Type 43-8 and Type 43-8 N Temperature Regulators with Hydraulic Controller Series 43 Self-operated Temperature Regulators Application Temperature regulation of instantaneous water heaters in small district heating units · Valve closes when the temperature rises The regulators are suitable for use with plate heat exchangers for domestic hot water (DHW) heating, particularly in small residential units. Fast-responding thermostats regulate the water temperature to the desired value without delay while the hydraulic control element closes the control valve immediately after tapping has been completed. This prevents the heated DHW from reheating. In addition, temperature peaks do not occur any longer, preventing scaling (lime deposits) in the heat exchanger. Moreover, the regulator switches to a reduced idle temperature that prevents the heating water supply lines from cooling off. This ensures that hot water is immediately available for the next tapping. The connections available as accessories enable operation with or without circulation of the heated DHW. Special features –– Low-maintenance proportional regulators requiring no auxiliary energy –– Control of small instantaneous water heaters –– Compact design –– Easy operation and installation –– Prevention of temperature peaks and reduction of loss during idle operation (reduced idle temperature) –– Stable control already at tapped quantity of 2 l/minute –– Idle temperature regulation –– Fast-responding vapor pressure thermostats Versions The Type 43-8 and Type 43-8 N Regulators function the same way, the only difference between them being that the technical features of the Type 43-8 N have been tailored to the requirements of local heat supply networks. Its overall height is approx. 20 mm lower than that of the Type 43-8. As a result, the regulators are not interchangeable. Regulator including accessories and indicated heat exchanger Fig. 1: Type 43-8 Temperature Regulator with Hydraulic Controller The regulators consist of a control thermostat (vapor pressure thermostat), a hydraulic control unit and a valve. Type 43-8 (43-8 N) Type 2430 Vapor Pressure Thermostat · Set point range 45 to 65 °C · In combination with Type 2432 Valve (2432 N) Red brass or hot-pressed brass body · DN 15 · PN 25 (PN 16) Suitable for liquids up to 130 °C (120 °C) · Permissible differential pressure ∆p = 20 bar (4 bar) · KVS 2.5 · Sensor made of CrNiMo steel · Observe mounting position. Type 2438 Hydraulic Controller · Red brass body · Idle temperature approx. 8 K (optionally 15 K) below adjusted set point · Required differential pressure at control element 0.4 to 0.6 bar · PN 16 SAMSON AKTIENGESELLSCHAFT · Weismüllerstraße 3 · 60314 Frankfurt am Main, Germany Phone: +49 69 4009-0

Principle of operation (Fig. 2) Fast-responding vapor pressure sensors are used to regulate the temperature of instantaneous water heaters. The temperature of the heated DHW creates a pressure in the sensor that corresponds to the actual pressure. This pressure is transferred through the capillary tube (8) to the operating element (13) and converted into a positioning force, which is compared to the force of the set point spring (10). The force ratio causes the plug in the valve (1) to move. Depending on the travel, an annular gap forms between the seat (2) and the plug (3) that determines the...

Table 1: Technical data 1 District heating supply 3 Domestic water 2 District heating return 4 Domestic hot water flow Fig. 4: Domestic hot water heated in an instantaneous heating system

Accessories To hot water tapping point Accessories Connecting piece (1) to hot water tapping point (G ¾ or G 1) with/without sensor pocket (G ¾ or G 1) · Including flat gasket · For temperature sensor Ø12, Rg 5 Heating water return pipe · Double nut (5) made of brass (G ¾ or G 1) for connection to heat exchanger · Welding end (3) with connection nut · Including flat gasket Heat exchanger connection Double nut (5) Distance a in mm Cold water connection Connection (4) · Corrugated pipe Cold water supply · Corrugated pipe (4) with/without circulation pipe connection (2) for connection to heat exchanger...