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English (US)
5. Product introduction
5.1 Product description
ALPHA1 26-99/ALPHA2 26-99 circulator pumps
are of the canned-rotor type. Pump and motor
form an integral unit without shaft seal, with only
one gasket for sealing and four screws for
fastening the stator housing to the pump
housing. The bearings are lubricated by the
pumped liquid.
5.1.1 ALPHA2 26-99 - internally controlled
These circulator pumps are designed for
systems with variable flow rates, where the
pump is internally controlled via a user interface.
Speed control can reduce the power
consumption considerably. In addition, speed
control is required to control the performance of
a system.
Fig. 1
ALPHA2 26-99
5.1.2 ALPHA1 26-99 - externally controlled
These circulator pumps are remote-controlled
via a low-voltage 0-10 VDC signal by a system
controller integrated in a boiler or a building
management system (BMS).
Fig. 2
ALPHA1 26-99
5.2 Applications
ALPHA1 26-99/ALPHA2 26-99 circulator pumps
are designed for circulating liquids in heating
and air-conditioning systems. They are suitable
for cold-water applications in the stainless steel
versions.
5.3 Pumped liquids
For more technical data, see section
The pump is suitable for the following liquids:
•
Clean, thin, non-aggressive and non-
explosive liquids without solid particles or
fibers.
•
If the pump is installed in a heating system,
the water must meet the requirements of
accepted standards on water quality in
heating systems.
•
In domestic hot-water systems, the pump
should be used only for water with a degree
of hardness lower than approx. 15 grain
CaCO3/gal (US) (2.5 mmol CaCO3/l). To
eliminate the risk of lime precipitation, the
medium temperature must not exceed
150 °F (65 °C).
•
Mixtures of water with anti-freezing media
such as glycol or ethanol down to 14 °F (-
10 °C) with a validated temperature profile.
Depending on the type of glycol, the mixture
and the liquid temperature, the viscosity
increases. The viscosity must not exceed
10 cSt (10 mm/s
2
).
TM
07
212
2
281
8
T
M
07
2
1
2
4
28
18
DANGER
Electric shock
Death or serious personal injury
- Do not use the pump in swimming
pool or marine areas.
DANGER
Flammable material
Death or serious personal injury
- Do not use the pump for flammable
liquids, such as diesel oil and
gasoline.
WARNING
Biological hazard
Death or serious personal injury
- In domestic hot-water systems, the
pump is permanently connected to
the water mains. Therefore, do not
connect the pump by a hose.
CAUTION
Corrosive substance
Minor or moderate personal injury
- Do not use the pump for aggressive
liquids.
