Brochure

Applications
UP Series
5
36
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 fixture furthest
away 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 (38 °C), the
valve closes, thus resulting in a constant availability of
hot water.
Savings
The Comfort System saves up to 16,000 gallons
(60,566 liters) 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.
Fig. 7 Comfort System
Motor
• Insulation class: F
• power consumption: 25 W
• voltage: 115 V
• current: 0.23 A
• phase: 1.
Grundfos Comfort Valve
®
materials listing
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 (10 bar).
Fig. 8 Performance curve for the Comfort System
TM03 9126 0513
Description (UP open systems) Material
Inlet cone, bearing plate, bearing
retainers, rotor can, rotor
cladding, shaft retainer
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
Description Trade name Material
Springs, pins, screens 300 Series Stainless steel
Valve housing Ryton PPS
Thermal actuator
housing
300 Series Stainless steel
Check valve O-ring EPDM
Check valve housing Acetal
Check valve plunger Thermoplastic
TM03 5547 4412
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 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
0.0 0.2 0.4 0.6 0.8 1.0 1.2 Q [m³/h]
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
[m]
H
UP15-10SU7P/TLC
60 Hz