CALEFFI ThermoBloc 281 Series, Manual

The CALEFFI ThermoBloc 281 Series comes with a comprehensive user manual that you can easily download for free from our website. Packed with detailed instructions, this manual allows you to effortlessly install, operate, and troubleshoot your ThermoBloc 281, ensuring optimal performance and longevity. Don't miss out on a hassle-free experience, grab your free manual now at manualshive.com.

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Caleffi North America, Inc.
3883 W. Milwaukee Road
Milwaukee, WI 53208
T: 414.238.2360 F: 414.238.2366

7-24-18

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Installation Tip

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281 ThermoBloc

TM

Leave this manual for the user.

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Summary of Contents for ThermoBloc 281 Series

Page 1: ...in an insulation shell These items are designed for use in closed hydronic systems Do not use in plumbing applications These items do not meet the low lead plumbing standards of U S and Canada Product range 281 series boiler protection recirculation and distribution unit NPT male or sweat sizes 1 1 1 4 Technical Characteristics Materials Body brass Shutter PSU Spring stainless steel Flapper check ...

Page 2: ...n this manual to draw attention to safety related instructions When used the safety alert symbol means ATTENTION BECOME ALERT YOUR SAFETY IS INVOLVED FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN A SAFETY HAZARD Pump characteristics Insulation Material EPP Mean thickness 30 mm Density 45 kg m3 Working temperature range 40 210 F 5 100 C Thermal conductivity 0 037 W m K at 10 C Reaction to fire...

Page 3: ...urn from the system port starts opening to produce the water mixing temperature in this phase the system loading begins When the mixed flow to the boiler temperature is greater than the set point of the boiler protection recirculation and distribution unit by approximately 18 F 10 C the bypass flow from the boiler port closes and water returns to the boiler at the same temperature as the return fl...

Page 4: ...thermosyphon circulation of the system heat transfer fluid when the pump stops running due to power failure When the pump is running under normal conditions the thrust of the flowing medium keeps the flapper closed forcing flow past the thermostatic sensor When the pump stops running and the fluid in the boiler is at high temperature natural circulation begins by passing the thermostatic sensor pr...

Page 5: ...or fig 2 4 Conduct appropriate maintenance or replace the thermostatic sensor with a new cartridge separately purchased The sensor can be fully inserted into the seat with a slight interference fit 5 Reassemble the shutter unit following the procedure in reverse order Replacement thermostatic sensor cartridges Easy replacement to change the ThermoBloc boiler protection recirculation and distributi...

Page 6: ...Caleffi North America Inc 3883 W Milwaukee Road Milwaukee WI 53208 T 414 238 2360 F 414 238 2366 7 24 18 Installation Tip Scan to view 281 ThermoBloc TM Leave this manual for the user ...

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