Accurex XCR, Manual

Page: 41 / 64

ROOF EXHAUST | 4 1
Wheel – Backward-inclined, non-overloading centrifugal wheel
is utilized to generate high efficiency and minimal sound.
Wheel cones are carefully matched to the venturi for maximum
efficiency. Each wheel is statically and dynamically balanced for
long life and quiet operation.
Disconnect Switch
– NEMA-1 switch is factory mounted and
wiring is provided from the motor as standard (other switches
are available). All wiring and electrical components comply
with the National Electrical Codes (NEC) and are either UL/cUL
Listed or Recognized.
Internal Conduit Chase
– A large diameter conduit for
installing electrical wiring through the curb cap into the
motor compartment.
Fan Shaft – Precisely sized, ground, and polished so the first
critical speed is at least 25% over the maximum operating
speed. Close tolerances, where the shaft makes contact with
bearings, results in longer bearing life.
Bearings
– 100% factory tested and designed specifically for
air handling applications with a minimum L10 life in excess of
100,000 hours (L50 average life of 500,000 hours).
Motor Cover – Constructed of aluminum. Attached with
stainless steel fasteners for easy removal and access to the
motor compartment and drive assembly.
Drive Assembly – Belts, pulleys and keys are oversized 150% of
driven horsepower. Machined cast pulleys are adjustable for
final system balancing. Belts are static-free and oil resistant.
Motor Cooling – Cooling fins located on top of fan wheel draw
outside air through a large space between the fan shroud and
the motor cover directly into the motor compartment. Positive
motor cooling with fresh air results in maximum motor life.
Vibration Isolation – True vibration isolators contain two
independent studs with rubber neoprene to support the drive
assembly and wheel for long life and quiet operation. No steel-
on-steel contact.
Fan Shroud – One-piece, heavy-gauge aluminum with a rolled
bead for additional strength directs exhaust air towards the
mounting surface. The curb cap and integral deep spun venturi
are attached to the windband and constructed of aluminum to
prevent corrosion.
Mounting Holes – Aluminum curb cap has pre-punched
mounting holes to ensure correct attachment to the roof.
Birdscreen – Rigid wire protects the fan’s discharge from birds
and small objects.
Curb Cap
– Curb cap (with integral deep spun venturi) is
constructed of aluminum in one-piece for a weathertight fit.
Lower Windband – Heavy-gauge aluminum with formed edges
for added strength and weather resistance.
Motor – Carefully matched to the fan load and mounted out of
the airstream.
Lifting Points – Select models have various lifting points located
on the drive frame or bearing plates.
Name Plate (not shown) – Permanent stamped aluminum plate
for exact model and serial identification number.
Seismic Certification – Certified to IBC 2015, ASCE 7-10 and
California OSHPD certification standards for all seismic design
categories. OSHPD/OSP# 0148-10, SDS Value 2.28.
High Wind/Hurricane Zone Certification – Miami-Dade NOA for
high wind and hurricane zones and Florida Product Approval.
1
9
10
11
12
13
14
15
16
2
3
4
5
6
7
8
STANDARD CONSTRUCTION FEATURES XRED AND XREB
13 1 11
8
3
2
7
5
6
4
15
10
9
14
12
16
16