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CAUTION:
When making the water connections, make sure that the boiler
protection unit connecting pipework is not mechanically over-stressed. Over
time this could cause breakages, with consequent water losses which, in
turn, could cause harm to property and/or people.
CAUTION:
Water temperatures higher than 100°F can be dangerous. During
the installation, commissioning and maintenance of the boiler protection unit,
take the necessary precautions to ensure that such temperatures do not
endanger people.
CAUTION:
In the case of highly aggressive water, arrangements must be made
to treat the water before it enters the boiler protection valve, in accordance
with current legislation. Otherwise the boiler protection unit may be damaged
and will not operate correctly.
Operation/Use
The thermostatic sensor, completely immersed in the medium, controls the movement of a
shutter that regulates the bypass flow from the boiler and toward the system. At boiler startup,
the boiler protection recirculation and distribution unit recirculates the bypass flow from the
boiler to bring the boiler up to temperature as quickly as possible. When the bypass flow from
the boiler exceeds the setting of the fixed thermostatic sensor, the unit’s return 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 flow from the system.
When power is out and the circulation pump stops running, the flapper check valve, which is
closed during normal operation, opens with a slight pressure differential resulting from the
effects of heated water in the boiler and cooler water in the distribution system, a natural
thermosyphon flow. This prevents a excessive heat buildup which eventually would cause the
pressure relief valve to open.
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.
The brass body prevents the formation of ferrous residues in the system, prolonging boiler
operating life.
The unit features a thermostatic sensor to control the temperature of water returning to the
boiler to prevent condensation. The sensor can be easily replaced for maintenance or set
point change.
CAUTION:
Make sure that all the connecting pipework is water tight.
