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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

g.

Termination strips, contactors, relays, current sensors, switches, and any other apparatus shall be labeled in approved manner as deemed by the owner.

4.

VFD (Variable Frequency Drive)

a.

The variable frequency drive LCD displays with H-O-A functionality or individual H-O-A switch(es) shall be readily accessible.

b.

The variable frequency drive H-O-A switches in the Hand position shall activate all required HVAC apparatus (e.g. outside air damper, isolation damper, etc) The VFD shall start the fan array after apparatus position indications and safeties are in an acceptable state.

c.

With the variable frequency drive H-O-A switch(es) on the VFD in the Auto position, the BAS shall start and stop the VFD. The VFD shall activate all required HVAC apparatus (e.g. outside air damper, isolation damper, etc.). The VFD shall start the fan array after apparatus position indications and safeties are in an acceptable state.

d.

The VFD shall provide an analog circuit to the fan component panel for VFD amperage to be monitored by the BAS for programmed fan array status and failure.

e.

The VSD shall provide a dry-contact circuit to the fan component panel for VSD fault function monitoring by the BAS.

5.

NOTE:

a.

Wire/Cables to be in separate raceways in categories of:

1)

"<30V"

2)

“>30 to <150V", and

3)

">150V to <600V".

b.

All enclosures to be rated for the highest voltage within.

2.11

Electrical provisions

A.

Fan motors shall be factory mounted and wired to an external disconnect switch within sight of the motor access door. Fan motors shall be interlocked with fan access door to shut down fan when door is opened.  Specification 20 05 13 refers to the NEMA standards and publications relevant to applications and use of both EMT and liquid tight flexible conduit.

B.

Disconnect switches and starters shall be mounted independent of the unit to allow for maintenance access and access to AHU components. Locate disconnect switches within close proximity and sight of the electrical component. Interlock fan motor starters with a position limit switch located at the fan section access door. The limit switch shall de-energize the fan motor or other electrical components when the access door is opened.

The University of Texas

CUSTOM AIR HANDLING UNITS WITH FAN ARRAY SYSTEMS

MD Anderson Cancer Center

23 73 24

MS041113

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