Brochure

NON-
CONDENSING
BOILER
NON-
CONDENSING
BOILER
Construction details
Single casting and reversibility
The compact brass body casting houses the pump and all functioning
components, offering easy installation, either on the right or left side
of the boiler. The temperature gauges can be easily removed and re-
inserted on the back side of the unit.
Brass body
The brass body prevents the formation of ferrous residues in the system,
prolonging boiler operating life.
Thermostatic sensor
The unit features a thermostatic sensor to control the temperature of
water returning to the boiler to prevent condensation.
Insulation
The ThermoBloc boiler protection recirculation and distribution units come
complete with an insulation shell to provide perfect thermal insulation.
Natural circulation flapper check valve
The flapper check valve allows the natural
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 thust
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, bypassing the thermostatic sensor, preventing
overheating in the boiler.
Flapper check valve – lock
Before installation, remove the screw that keeps the flapper check valve
closed. This screw is factory-installed to prevent breakage during shipment.
Removing the protective screw ensures full functionality of the flapper check
valve as a natural circulation device. To do this, unscrew the union located
on the mixed water outlet port (to boiler) and access the screw inside the
valve body, unscrewing it using a phillips head screw driver.
Dirt separator
The Caleffi DIRTCAL
®
5462 series dirt separator should
be installed to perform continuous dirt separation.
Installation
The ThermoBloc
™
boiler protection
recirculation and distribution unit
can be installed on both sides
of the boiler following the flow
directions indicated on the body.
Installation is recommended on
the return to the boiler in mixing
mode, in vertical postion (axis
of the pump horizontal and the
axis of the thermostatic sensor
vertical). The allows for the
proper functionality of the natural
circulation flapper check valve.
Installation on right side of generator.
Installation on left side of generator.