Accurex XCR, Руководство пользователя

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ROOF EXHAUST | 4 3
EMERGENCY SMOKE CONTROL MODEL XRED AND XREB
When you buy an Accurex model XRED or XREB, you receive a fan with the industry’s best performance
and durability for Smoke Control Applications (as found in emergency smoke control systems).
• The first spun aluminum UL/cUL Listed fan for Emergency Smoke Control Systems in the industry.
• UL/cUL Listed for 500°F (260°C) for 4 hours and 1,000°F (538°C) for 15 minutes.
• Half the weight of traditional smoke control fans, an ideal choice for roof load concerns.
• Low profile, height is less than half of traditional smoke control fans, maximum of 48 inches (1,219 mm)
from curb cap to top of fan.
• Multiple applications, capable of exhausting general clean air and satisfying emergency smoke
control regulations.
GREENHECK VARI-GREEN
®
MOTOR MODEL XRED
Greenheck's electronically commutated EC Vari-Green (VG) motor combines motor technology, controllability
and energy efficiency into one single low maintenance unit and is the industry’s first fully controllable motor.
When combined with Accurex’s XRED fans, all the CFM and static pressure ranges of a belt drive can be attained.
Features are:
• Operates on AC power that’s converted to DC— providing higher
efficiency motor operation compared to an AC operation
• The motor can attain up to 85% efficiencies and reduce energy
consumption
• Watt savings of 30-70% depending on RPM
Note: As motor speed is turned down, efficiency is maintained
as compared to an AC motor with virtually no efficiency gains
• Runs cooler than a standard AC motor. A cooler running motor
has a longer motor life and reduces energy consumption, see
Motor Turndown Comparison chart at right
• 80% usable turndown vs. 30%
• The VG motor provides an easier solution for variable volume
systems and system balancing
Direct Drive Benefits – Direct drive fans are often preferred for motors where maintenance access is difficult. XRED fans with Greenheck Vari-Green
motors can provide all the cfm and static pressure ranges of a comparable belt drive—and since there are no belts or bearings to replace and no
pulleys to adjust, maintenance costs are reduced. Other benefits include:
• Compact housing design requires a smaller footprint
• Low vibration
• Suitable for clean air application - no belt or bearing residue in airstream
• Easy building system balancing
Constant Volume – Constant volume systems are more limited to applications where heating and cooling loads are constant. A typical application
could be a dedicated computer room, where computers run 24 hours a day. Some disadvantages are limited control for comfort zones, high
electrical/energy consumption and higher maintenance due to frequent starting and stopping.
Greenheck Vari-Green Motor Mounted Control
• A potentiometer (speed control dial) is attached to the motor for easy speed adjustment for building balance.
• Simply turn a dial instead of adjusting belts and pulleys.
Fan
Price
VFD
Price
Example: Initial Cost Comparison
Belt Drive vs. Direct Drive Vari-Green
$0 100 200 300 400 500 600 700
XREB-120
XRED-120-VG
IN
PU
T P
O
W
ER (W
AT
TS)
600
50% 75% 100%
500
XRED-120 with Vari Green
400
XREB-120 Single-Phase*
300
XRED-120 with PSC
200
*XREB is a belt driven fan
100
0
350 FAN SPEED (RPM) 1750
The length of each curve indicates the practical turndown range.
Data is for 1/2 hp motors with load of 0.35 Bhp at full speed