CALEFFI ThermoBloc 281 Series Manual - Page 5

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Maintenance/Temperature setting field change out

To remove the thermostatic sensor for maintenance or field change

out of thermostatic sensor cartridge, proceed as follows, paying

attention to the position of each component:

1) Remove the insulation and the temperature gauges, shut off

the three separately-purchased ball valves and remove the

unit body from the pipes.

2) Using a 17 mm hex key, unscrew and extract the shutter

locking nut, entering through the upper by-pass from boiler

port on the unit (fig. 1).

3) Extract the spring: attached to it are the shutter and the

thermostatic sensor (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 parts and accessories

Replacement thermostatic sensor cartridges. Easy replacement to change

the ThermoBloc™ boiler protection recirculation and distribution unit set

temperature:

F29633 115°F (45°C)

F29634 130°F (55°C)- standard factory-supplied setting

F29635 140°F (60°C)

F29636 160°F (70°C)

Replacement pump. Easy replacement by removing 2 bolts and inserting

the head in the 281 assembly.

F19379 115 VAC / .8 A. 16 feet head

R50057

Replacement 1-1/2" union washer.

Dual scale temperature gauge for ThermoBloc™ boiler protection recirculation

and distribution unit:

32 - 250°F (0 - 120°C)

F29571