Brochure

CIRCULATORS Bell & Gossett Cast Iron Wet Rotor Circulators / NRF
15
Optional Zone Pump Relay Control
The ZoneTrol II AZ-1A is a single zone pump
relay that turns the pump and boiler on when
the thermostat calls for heat. The AZ-1A is ideal
when adding a zone to an existing system
and can be daisy-chained together to control
multiple zones (See page 25.)
NRF-25 NRF-36 NRF-45
Three-Speed NRF Circulators
Reliable, maintenance-free, whisper quiet wet
rotor circulators designed for residential and
light commercial heating systems.
DuraGlide™ Bearing System (blue areas in
cutaway illustration) incorporates several
components working together to eliminate
seasonal freeze-up
Powerful motor with high
starting torque provides years
of trouble-free operation
Three speed motors on
select models offer a
wide range of hydraulic
capabilities
One-piece, high-nickel
stainless steel stator can
isolate the stator
from system fluid and
maintains precision
bearing alignment for
longer bearing life
Carbon bearings,
diamond-like ceramic
shaft and generous
clearances are more
resistant to lime, chloride
and oxide build-up
Face plate and rotor sleeve feature
corrosion resistant stainless steel
construction for longer life
Stabilized, heat resis-
tant, non-metallic
impeller. Its closed
design improves
operating efficiency
Self-cleaning particle
shield protects the
shaft and bearings
from system start-up
debris
Three-Speed NRF Circulator Performance Curves
Face plate and rotor sleeve feature
Face plate and rotor sleeve feature
of trouble-free operation
longer bearing life
Carbon bearings,
diamond-like ceramic