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MD ANDERSON Project No. XX-XXXX

MD ANDERSON PROJECT NAME

A/E Name

Issue Description

A/E Project No.

Month, 00, 0000

10.

Fans shall be both dynamically and statically balanced. Dynamic fan wheel balancing shall be conducted from 16 Hz to 105 Hz to identify and eliminate critical speeds to ensure stable operation through the entire operating range.  Each individual fan/motor assembly shall be dynamically balanced to meet AMCA standard 204-96, category BV-5, to meet or exceed Grade 2.5 residual unbalance.

11.

Fans shall be rated in accordance with AMCA 210 for performance and AMCA 300 for sound.

B.

Motors and Drives:

1.

Multiple Fan/Motor VFD Control:  The fan array shall consist of multiple fan and motor “cubes”, spaced in the air way tunnel cross section to provide uniform airflow and velocity profile across the entire airway tunnel section and components contained therein.  Each individual fan motor and VFD(s) shall be individually wired to a power disconnect.  

2.

All motors shall be standard T-frame pedestal mounted type, (TEAO) or (TEAC), selected at the specified operating voltage, rpm, and efficiency as scheduled on the Drawings.  All motors shall be compatible for inverter duty and shall include isolated bearing or shaft grounding.  To ease the replacement of the assembled fan/motor, the motor shall not exceed the nominal rating of 10 horsepower.

3.

Fan motors shall be premium efficiency and compatible for inverter duty and meet the endurance and bearing performance requirements for the nominal horsepower rating per Specification Section 20 05 13 - Motors.

4.

Fan motors shall have permanently sealed non-greasable bearings.

5.

All motors with VFDs shall be compatible with the VFD and tested at the factory.  Motors shall be capable of running continuously from 0 up to 120 Hz and deliver full rated horsepower at 60 Hz to 120 Hz operating frequencies.

6.

Variable Frequency Drives (VFD):  

a.

Refer to Section 23 05 13 – Variable Frequency Drives.

b.

Where indicated on the Drawings, furnish as a part of the unit assembly by the AHU manufacturer, with drive matched to motor without noise or vibration over the entire operating range.

c.

Drives shall be erected on wall where shown on Drawings with support from floor.

d.

Circuitries for VFD fault /failures, single fan failure or trip conditions are provided by the manufacturer for connecting with the Owner’s building automation system (BAS) for control and monitoring purposes. Connection to the Owner’s existing BAS shall be accomplished though hard wire inputs and outputs. Gateway / Interfaces are not allowed. Refer to Fan Array component panel requirements in this Specification Section.

2.05

Coil section

A.

Coil Casing:

1.

Coil casing shall comply with requirements for general construction.  

The University of Texas

CUSTOM AIR HANDLING UNITS WITH FAN ARRAY SYSTEMS

MD Anderson Cancer Center

23 73 24

MS041113

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