Overview of Primary Product
Applications
UP Series
25
Comfort system
The Comfort system uses a patented Comfort valve
and pump to provide instant availability of hot water at
the point of use.
Operation
The Comfort valve is installed at the furthest fixture
from the hot-water tank. With a built-in timer, the pump
allows hot water to circulate along the loop through the
valve using the cold-water side as a return line. As the
temperature rises to 100 °F, the valve closes directing
hot water to the tap, resulting in a constant availability
of hot water.
Savings
The Comfort system saves up to 16,000 gallons of
water per year and per household (based on average
modern household usage) and uses less energy than a
25 W light bulb.
Applications
• Domestic hot-water recirculation systems in single-
and two-family houses.
Pumped liquids
• Domestic hot water
• Potable and non-potable water
• Softened water.
Fig. 7 Comfort system
Motor
• Insulation class: F.
• Power consumption: 25 W.
• Voltage: 115 V.
• Current 0.23 A.
• Phase: 1.
Ambient and liquid temperatures
Liquid temperature: 36 °F (2 °C) to 150 °F (66 °C).
It is recommended to keep the operating temperature
as low as possible (e.g. 140 °F (60 °C)) to avoid calcium
precipitation.
The ambient temperature should always be lower than
the liquid temperature, as otherwise condensation may
form in the stator housing.
Maximum system pressure
145 psi.
Fig. 8 Performance curve for the Comfort system
TM03 9126 3407
Description
(UP open systems)
Material
Inlet cone, bearing plate, bearing
retainers, rotor can, rotor
cladding, shaft retainer
304 stainless steel
Volute retainer (SU & SF models)
and stator housing
Aluminium
Shaft, upper and lower radial
bearings
Aluminium oxide ceramic
Thrust bearing
Carbon bearing and EPDM
retainer
Pump housing (volute)
Silicon bronze C875 or stainless
steel 300 series.
O-ring and gaskets
EPDM (ethylene propylene
rubber)
Impeller PES composite (30 % glass-filled)
Terminal box Noryl® with EPDM gasket
TM03 5547 3806
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0
Q [US GPM]
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
[ft]
H
UPSeries.book Page 25 Tuesday, September 18, 2007 1:01 PM