Brochure

111
10
C
BOILER PROTECTION RECIRCULATION AND DISTRIBUTION UNIT
Code Description Pk Lbs USD
281965A 1" sweat 130ºF Tset 1 11 1,215.00
281966A 1" sweat 140ºF Tset 1 11 1,215.00
281975A 1¼" sweat 130ºF Tset 1 11 1,430.00
281976A 1¼" sweat 140ºF Tset 1 11 1,430.00
By-pass
from boiler
Shutter
Mixed
to boiler
Return
from system
Thermostatic
sensor cartridge
Temperature gauge
pocket wells (3)
Three speed
pump
Valve body
Check valve for
natural circulation
Code Description Pk Lbs USD
281165A 1" NPT 130ºF Tset 1 11 1,300.00
281166A 1" NPT 140ºF Tset 1 11 1,300.00
281175A 1¼" NPT 130ºF Tset 1 11 1,495.00
281176A 1¼" NPT 140ºF Tset 1 11 1,495.00
Flapper check valve
Flapper
The fl apper check valve allows the natural thermosyphon circulation of
the system heat transfer fl uid when the pump stops running due to power
failure. When the pump is running under normal conditions the thrust of the
owing medium keeps the fl apper closed, forcing fl ow past the thermostat-
ic sensor. When the pump stops running and the fl uid in the boiler is at high
temperature, natural circulation begins, by-passing the thermostatic sensor,
preventing over heating in the boiler.
Function
281
ThermoBloc™ Sweat
281
ThermoBloc™ NPT
ThermoBloc boiler protection
recirculation and distribution unit.
Suitable fl uids: water, up to 50% glycol
solutions.
Max. working pressure: 150 psi.
Working temperature range: 40—210ºF.
Maximum pumping capacity: 10 gpm.
Temperature gauge scale: 30—250ºF
Thermostatic sensor:
130ºF & 140°F Tset standard selections,
see below.
115ºF, 160ºF Tset optional models*.
Sensor cartridge accuracy: ±4ºF.
By-pass from boiler complete closing
temperature: Tset +18°F (ex. 130°+18°=148°F).
* Consult factory
ThermoBloc
boiler protection
recirculation and distribution unit.
Suitable fl uids: water, up to 50% glycol
solutions.
Max. working pressure: 150 psi.
Working temperature range: 40—210ºF.
Maximum pumping capacity: 10 gpm.
Temperature gauge scale: 30—250ºF
Thermostatic sensor:
130ºF & 140°F Tset standard selections,
see below.
115ºF, 160ºF Tset optional models*.
Sensor cartridge accuracy: ±4ºF.
By-pass from boiler complete closing
temperature: Tset +18°F (ex. 130°+18°=148°F).
* Consult factory
The ThermoBloc
boiler protection recirculation and distribution unit is
used in hydronic heating systems with non-condensing boilers, including
solid fuel, biomass, gas LP or oil-fi red. It can be installed with steel, cast
iron and copper tube style boilers, automatically controlling the return water
temperature, protection against corrosion from condensation occurring
when a minimum fl ue gas temperature is not otherwise maintained.
The ThermoBloc™ unit is compact for easy installation, reducing required
space and fi ttings. It combines the functionality of a boiler protection valve
with a circulation pump and a unique fl apper check valve allowing for
thermosyphon fl ow between the boiler and distribution system during a
power outage. The ThermoBloc™ includes three temperature gauges and
is encased in an insulation shell.
Function
SOLID FUEL
BOILER
SOLID FUEL
BOILER
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