Attachment 3 - Specifications.pdf

Zoned Roof-Top AHU Specifications

Specifications Page 1 Zoned Roof-Top AHU

SUBMITTALS

Shop Drawings: Indicate assembly, unit dimensions, weight loading, required clearances, construction details, field connection details, and electrical characteristics and connection requirements. Computer generated fan curves for each air handling unit shall be submitted with specific design operating point noted. A computer generated psychometric chart shall be submitted for each cooling coil with design points and final operating point clearly noted. Sound data for discharge, radiated and return positions shall be submitted by octave band for each unit. Calculations for required base rail heights to satisfy condensate trapping requirements of cooling coil shall be included.

Product Data:

Provide literature that indicates dimensions, weights, capacities, ratings, fan performance, finishes of materials, electrical characteristics, and connection requirements.

Provide data of filter media, filter performance data, filter assembly, and filter frames.

Provide manufacturer's installation instructions.

General The units must be rigged and lifted in strict accordance with the Installation Operation and Maintenance manual. The units are to be installed in strict accordance with manufacturer specifications. Units may be shipped fully assembled or disassembled to the minimum component size according to shipping or jobsite requirements. Units shipped in one piece will have a minimum of six points of lift. These lift points will be permanently attached to the unit base and be designed to accept standard rigging devices. Units shipped in sections will have a minimum of four points of lift. The acceptable ambient temperature range for unit operation shall be -40°F to +125°F.

PRODUCTS

Unit Characteristics Units must provide zone control capability matching existing zone layouts. Zone dampers may be internal to unit or provided as a separate adaptor assembly below unit. Zone dampers and actuators are to be factory installed as an integral part of the system.

Unit Construction Unit panels shall be of heavy gauge solid double‐wall construction. The unit base design will allow unit to rest on top of roof curb when field installed. Entire length and width under base will be sealed for additional water management protection.

Insulation Unit shall be factory insulated. Panels and unit roof shall be of double‐wall construction with interior and exterior panels and insulation. Insulation shall conform to NFPA 90 requirements. Modules shall be provided with 3 lb fiberglass insulation and TUFF‐R™ Commercial 1.5‐inch polyisocyanurate foam board insulation or approved equivalent.

Unit Paint External surface of unit casing shall be prepared and coated with a minimum 1.5 mil enamel finish or equal. Units supplied with casing exterior factory painted shall be able to withstand a salt spray test in accordance with ASTM B117 for a minimum of 500 consecutive hours. Unit casing exterior will be provided with manufacturer’s standard color, or alternative color when required

Specifications Page 2 Zoned Roof-Top AHU

Unit Roof Unit roof will be constructed of two pieces. Inner roof will be installed in such a manner as to prevent air bypass between internal components. Outer roof will be sloped a minimum .25" per foot either from one side of unit to other, or from center to sides of the unit. Roof assembly will overhang all walls of units by 2" minimum.

Pans Coils and moisture eliminators shall be provided with a stainless steel, two‐way sloping IAQ drain pan to allow for proper condensate removal. Access or blank sections may be provided with an IAQ drain pan when specified. Access Door Construction 1.7” thick door pressure injected with 2.2 pounds of polyurethane foam per cubic foot. Hot dipped galvanized G90 steel finish, standard. “Cake Pan” design with overlapping steel sheets front and back that bond with the polyurethane foam to create a seamless rigid panel with an insulating value of R11.

Thermal door panel uses a high‐density extruded PVC thermal break. Minimum steel overlap at thermal door edge for improved condensation resistance.

Fans The fan(s) may be internally isolated. Fans available are double‐width, double‐inlet centrifugal types with forward curved, backward inclined, or airfoil blade. Fans are available in low, medium, and high pressure classes or Efficient or Electronically Commutated Motor. To insure fan stability, the fan ships with four

(4) Lock Down devices that prevent the fan from shifting during shipment and installation. These spacers may be removed prior to fan operation to achieve proper vibration isolation. Electronically Commutated Motor will be solid mounted on to a fan pressure wall, or Efficient or Electronically Commutated Motor will not be isolated.

Motors All motors will match one of the following: Open ‐ Drip Proof Unguarded (OPEN), Open ‐ Slotted Band (OPSB), Totally Enclosed Air Over (TEAO), Totally Enclosed Fan Cooled (TEFC) and Totally Enclosed Explosion Proof Premium or Efficient or Electronically Commutated Motor

COOLING AND HEATING COILS

Certification:

Acceptable water cooling, water heating, steam, and refrigerant coils shall be certified in accordance with AHRI Standard 410 and bear the AHRI label. Coils exceeding the scope of the manufacturer’s certification and/or the range of AHRI’s standard rating conditions will be considered provided the manufacturer is a current member of the AHRI Forced Circulation Air-Cooling and Air-Heating Coils certification programs and that the coils have been rated in accordance with AHRI Standard 410.

Manufacturer must be ISO 9002 certified.

Water cooling and heating coil shall be provided. Provide access to coil(s) for service and cleaning.

Enclose coil headers and return bends fully within unit casing. Drain and vent connections shall be provided exterior to unit casing. Coil connections must be factory sealed with grommets on interior and exterior panel liners to minimize air leakage and condensation inside panel assembly. If not factory packaged, Contractor must supply all coil connection grommets and sleeves. Coils shall be removable through side and/or top panels of unit without the need to remove and disassemble the entire section from the unit.

Headers shall consist of seamless copper tubing to assure compatibility with primary surface. Headers to have intruded tube holes to provide maximum brazing surface for tube to header joint, strength, and inherent flexibility. Header diameter should vary with fluid flow requirements.

Fins shall have a minimum thickness of 0.0075 inch aluminum plate construction. Fins shall have full drawn collars to provide a continuous surface cover over the entire tube for maximum heat transfer. Tubes shall be mechanically expanded into the fins to provide a continuous primary to secondary compression bond over the entire finned length for maximum heat transfer rates. Bare copper tubes shall not be visible

Specifications Page 3 Zoned Roof-Top AHU between fins.

Vent and drain fittings shall be furnished on the connections, exterior to the air handler. Vent connections provided at the highest point to assure proper venting. Drain connections shall be provided at the lowest point to insure complete drainage and prevent freeze-up.

Coil casing shall be a formed channel frame of galvanized steel.

Provide a Heresite (or approved equal) coil coating.

Filters Filter sections shall have filter racks, an access door for filter loading and removal, and block‐offs as required to prevent air bypass around filters. Furnish flat panel filter section with 2-inch pleated MERV 8 filter with microbial resistant coating. Filter media shall be UL 900 listed, Class I or Class II.

Specifications Page 16 Variable Frequency Drives

G. Additional options

1. Line reactors shall be provided on the input side of the drive for harmonic suppression.

2. Output reactors shall be provided on the output side of the drive for motor protection in long motor lead length situations.

3. Multiple motor operation; Two motor “OR” control; Multiple motor “AND” control shall be provided.

4. Two motor “OR” control allows local or remote motor operation selection between two individual motors (pump #1 “OR” auto “OR” pump #2).

5. Multiple motor “AND” control allows the operation of several motors from one drive (pump #1, pump #2, “AND” pump # 3 are operated at the same speed via the output from one drive).

6. Serial communication capability for Echelon LonWorks and EtherNet/IP shall be provided.

7. Output motor protection (dv/dt) filter shall be provided to accomplish, long motor lead length solutions.

8. PC software and cable for parameter upload/download/graphing shall be provided.

9. 12-Pulse phase shifting transformer shall be provided on: 25 HP to 150 HP @

208 VAC, 30 HP to 150 HP @ 240 VAC, and 40 HP to 500 HP @ 480 VAC models to minimize THD generated by the VFD.

10. 18-Pulse phase shifting transformer shall be provided on: 25 HP to 150 HP @

Specifications Page 1 Variable Frequency Drives

VARIABLE FREQUENCY DRIVES

PART 1 GENERAL

1.01 SECTION INCLUDES

A. Variable Frequency Drive (VFD).

1.02 RELATED SECTIONS

A. Section 16195 - Electrical Identification: Engraved nameplates.

1.03 REFERENCES

A. NEMA ICS 3.1 - Safety Standards for Construction and Guide for Selection, Installation and Operation of Variable Frequency Drive Systems

B. NEMA 250 - Enclosures for Electrical Equipment (1000 Volts Maximum).

C. UL, and cUL Approved

D. IEEE Standard 519

E. UL 508C (Power Conversion)

F. UL 508A (Industrial Control Panel)

G. CSA 22.2 No. 14-95 (Industrial Control Equipment)

H. UL 1995 (Plenum rating)

I. EN 61800-5-1 (LVD)

J. EN 61800-3 First Environment restricted

K. CE mark 2006/95/EC LVD

L. CE mark 2004/108/EC

M. RoHS

N. IBC 2006 Seismic – referencing ASC 7-05 and ICC AC-156

Specifications Page 2 Variable Frequency Drives

1.04 SUBMITTALS

A. Shop Drawings shall include: Wiring diagrams, electrical schematics, front and side views of enclosures, overall dimensions, conduit entrance locations and requirements, nameplate legends, physical layout and enclosure details.

B. Product Data: Provide data sheets showing; voltage, ratings of customer use switching and over-current protective devices, short circuit ratings, and weights.

C. Manufacturer's Installation Instructions and Technical Manuals: Indicate application conditions and limitations of use stipulated by product testing agency specified under regulatory requirements. Include instructions for storage, handling, protection, examination, preparation, installation, and starting of adjustable speed drive. Document the sequence of operation, cautions and warnings, troubleshooting procedures, spare parts lists and programming guidance.

1.05 QUALITY ASSURANCE

A. VFD shall have a minimum MTBF (mean time between failures) rating of 28 years (245,280 Hours).

1.06 OPERATION AND MAINTENANCE DATA

A. Include instructions for starting and operating VFD, and describe operating limits, which may result in hazardous or unsafe conditions.

1.07 QUALIFICATIONS

A. Manufacturer must have a minimum of 25 years of documented experience, specializing in variable frequency drives.

Specifications Page 3 Variable Frequency Drives

1.08 DELIVERY, STORAGE, AND HANDLING

A. Accept VFD on site in original packing. Inspect for damage.

B. Store in a clean, dry space. Maintain factory wrapping, or provide an additional heavy canvas or heavy plastic cover, to protect units from dirt, water, construction debris, and traffic.

C. Handle carefully, in accordance with manufacturer's written instructions, to avoid damage to components, enclosure, and finish.

1.09 WARRANTY

A. Provide VFD warranty, for one year from date of startup, not to exceed 18 months from date of shipment. Warranty shall include parts, and labor allowance for repair hours.

PART 2 PRODUCTS

2.01 MOTORS

A. Motors should be inverter duty rated, per NEMA MG1 parts 30 and 31, for motor-drive compatibility.

2.02 DESCRIPTION

A. Provide enclosed variable frequency drives suitable for operation at the current, voltage, and horsepower indicated on the schedule. Conform to requirements of

NEMA ICS 3.1.

2.03 RATINGS

A. VFD must operate, without fault or failure, when voltage varies plus 10% or minus 15% from rating, and frequency varies plus or minus 5% from rating.

B. VFD shall be 460 volts, 60 Hz, 3 Phase

C. Displacement Power Factor: 0.98 over entire range of operating speed and load.

D. Service factor: 1.0

E. Operating Ambient Temperature:

NEMA 1 (IP20): -10°C to 40°C (14°F to 104°F)

Specifications Page 4 Variable Frequency Drives

F. Ambient storage temperature: -20°C to 70°C (-4°F to 158°F)

G. Humidity: 0% to 95% non-condensing.

H. Altitude: to 3,300 feet (1000m), higher altitudes achieved by derating.

I. Vibration: 9.81m/s2 (1 G) maximum at 10 to 20 Hz, 2.0 m/s2 (0.2 G) at 20 Hz to 55 Hz.

J. Minimum Efficiency: 96% at half speed; 98% at full speed.

K. Starting Torque: 100% starting torque shall be available from 0.5 Hz. to 60 Hz.

L. Overload capability: 110% of rated FLA (Full Load Amps) for 60 seconds; 150% of rated FLA peak.

M. Controlled speed range of 40:1

N. The VFD’s shall include EMI/RFI filters. The onboard RFI filter shall allow the entire VFD assembly to be CE Marked and the VFD shall meet product standard EN 61800-3 for the First Environment restricted. No Exceptions.

O. Total Harmonic Distortion (THD) compliance:

Given the information provided by the customer’s electric power single line diagram and distribution transformer data, the VFD manufacturer shall carry out an analysis of the system. The analysis reviews the potential for the proposed equipment, and any existing equipment, to meet IEEE 519 (tables 10.2 and 10.3) recommendations at the Point of Common Coupling (PCC). The result of the analysis shall determine if additional power quality improvement measures should be included in the proposal to meet the THD recommendations of IEEE 519. The PCC shall be at the primary side of the main distribution transformer.

P. VFDs must be suitable for use on a circuit capable of delivering not more than

100,000 RMS symmetrical amperes.

Specifications Page 5 Variable Frequency Drives

2.04 DESIGN

A. VFD shall employ microprocessor based inverter logic, isolated from all power circuits.

B. VFD shall include surface mount technology with protective coating.

C. VFD shall employ a PWM (Pulse Width Modulated) power electronic system, consisting of:

1. Input Section:

a. VFD input power stage shall convert three-phase AC line power into a fixed DC voltage via a solid state full wave diode rectifier, with MOV (Metal Oxide Varistor) surge protection.

b. A minimum of 5% DC bus impedance to minimize reflected current.

2. Intermediate Section:

a. DC bus as a supply to the VFD output Section shall maintain a fixed voltage with filtering and short circuit protection.

b. DC bus shall be interfaced with the VFD diagnostic logic circuit, for continuous monitoring and protection of the power components.

3. Output Section

a. Insulated Gate Bipolar Transistors (IGBTs) shall convert DC bus voltage to variable frequency and voltage.

b. The VFD shall employ PWM sine coded output technology to power the motor.

D. The VFD must be rated for operation at a carrier frequency of 5 kHz to satisfy the conditions for current, voltage, and horsepower as indicated on the equipment schedule.

E. VFD shall have an adjustable carrier frequency, from 1 kHz to 12.5 kHz

(Above 250 HP from 1 kHz to 5 kHz) F. VFD Must include an adjustable dynamic noise control for quiet motor operation

G. VFD shall have embedded Building Automation System (BAS) protocols for network communications; BACnet , Modbus/Memobus, Siemens Apogee, Johnson Controls Metasys. These protocols shall be accessible via a RS-422/485 communication port.

H. VFD shall include two independent analog inputs. Selectable for either 0-10 VDC

Specifications Page 6 Variable Frequency Drives or 4-20 mA. Either input shall respond to a programmable bias and gain.

I. VFD shall include a minimum of seven multi-function digital input terminals, capable of being programmed to determine the function on a change of state.

These terminals shall include, but not limited to:

1. Remote/Local operation selection

2. Customer Safeties

3. BAS / Damper Interlock

4. Emergency Override

5. Preset Speed

6. PI control enable / disable

J. VFD shall include two selectable 0-10 VDC or 4-20 mA analog outputs for monitoring, or "speed tracking" the VFD. The analog output signal will be proportional to output frequency, output current, output power, PI (Proportional & Integral control) feedback or DC bus voltage.

K. VFD shall provide terminals for remote input contact closure, to allow starting in the automatic mode.

L. VFD shall provide 24 Vdc, 150ma transmitter power supply

M. VFD shall include at least one external fault input, which shall be programmable for a normally open or normally closed contact. These terminals can be used for connection of firestats, freezestats, high pressure limits or similar safety devices.

N. VFD shall include three programmable form "A" contacts and one fixed “Fault” form "C" contact, capable of being programmed to determine conditions that must be met in order for them to change state. These output relay contacts shall be rated for at least 2A at 120 VAC and shall include, but not limited to:

1. Speed agree detection

2. Damper control

3. Hand / Auto Status

4. No load detection (broken belt alert)

5. Contactor Control for External Bypass

6. Drive Faulted

7. Serial communication status

O. VFD shall include a power loss ride through capable of 2 seconds.

P. VFD shall have DC injection braking capability, to prevent fan “wind milling” at start or stop, adjustable, current limited.

Specifications Page 7 Variable Frequency Drives

Q. VFD shall have a motor preheat function to prevent moisture accumulation in an idle motor.

R. VFD shall include diagnostic fault indication, time and date stamped faults storage and heatsink cooling fan operating hours.

S. VFD shall have a digital operator with program copy and storage functions to simplify set up of multiple drives. The digital operator shall be interchangeable for all drive ratings.

T. VFD shall include a front mounted, sealed keypad operator, with an English language illuminated LCD display. The operator will provide complete programming, program copying, operating, monitoring, real time clock and diagnostic capability. Keys provided shall include industry standard commands for Hand, Off, and Auto functions.

U. VFD plain language display shall provide readouts of; output frequency in hertz, PI feedback in percent, output voltage in volts, output current in amps, output power in kilowatts, D.C. bus voltage in volts, interface terminal status, heatsink temperature and fault conditions. All displays shall be viewed in an easy-to-read illuminated LCD.

V. VFD shall have an internal time clock. The internal time clock shall include a back up via battery. The time clock will be used to date and time stamp faults and record operating parameters at the time of fault. The internal time clock can be programmable to control start/stop functions, constant speeds, PID parameter sets and output Form-C relays.

W. VFD unit shall include the following meters to estimate use of energy:

1. Elapsed Time Meter

2. Kilowatt Meter

3. Kilowatt Hour Meter

X. VFD shall include a user selectable PI control loop, to provide closed loop set point control capability, from a feedback signal, eliminating the need for closed loop output signals from a building automation system. The PI controller shall have a differential feedback capability for closed loop control of fans and pumps for pressure, flow or temperature regulation in response to dual feedback signals.

Specifications Page 8 Variable Frequency Drives

Y. VFD shall have an independent, PI loop that can be used with a second analog input that will vary the VFD analog output and maintain a set point of an independent process (valves, dampers….).

Z. The VFD shall include HVAC specific application macros. The macros can be used to help facilitate start-up. The macros will provide initialization to program all parameters and customer interfaces for a particular application (Fans, Pumps and Cooling Towers) to reduce programming time

AA. An energy saving sleep function shall be available in both open loop (follower mode) and closed loop (PI) control, providing significant energy savings while minimizing operating hours on driven equipment. When the sleep function senses a minimal deviation of a feedback signal from set point, or low demand in open loop control, the system reacts by stopping the driven equipment. Upon receiving an increase in speed command signal deviation, the drive and equipment resume normal operation.

BB. VFD shall include loss of input signal protection, with a selectable response strategy including speed default to a percent of the most recent speed.

CC. VFD shall include electronic thermal overload protection for both the drive and motor. The electronic thermal motor overload shall be approved by UL. If the electronic thermal motor overload is not approved by UL, a separate UL approved thermal overload relay shall be provided in the VFD enclosure.

DD. VFD shall include an intelligent bypass mode. This mode will program the VFD to automatically transfer the motor across the line when the application requires 60Hz at peak demand (summer months, daytime). The removal of the VFD at 60Hz saves energy, eliminates harmonics and reduces utility costs for the end-user.

EE. VFD shall include the following program functions:

1. Critical frequency rejection capability: 3 selectable, adjustable dead bands.

2. Auto restart capability: 0 to 10 attempts with adjustable delay between attempts.

3. Ability to close fault contact after the completion of all fault restart attempts.

4. Stall prevention capability.

5. "S" curve soft start / soft stop capability.

6. Bi-directional "Speed search" capability, in order to start a rotating load.

Specifications Page 9 Variable Frequency Drives

7. 14 preset and 1 custom volts per hertz pattern.

8. Heatsink over temperature speed fold back capability

9. Terminal status indication.

10. Program copy and storage in a removable digital operator.

11. Programmable security code

12. Current limit adjustment capability, from 30% to 200% of rated full load current of the VFD.

13. Motor pre-heat capability

14. Input signal or serial communication loss detection and response strategy.

15. Anti "wind-milling" function capability.

16. Automatic energy saving function.

17. Under torque/Over torque Detection.

18. Fan failure detection and selectable drive action

19. Bumpless” transfer between Hand and Auto modes

20. Seven preset speeds

21. VFD shall include factory settings for all parameters, and the capability for those settings to be reset.

22. VFD shall include user parameter initialization capability to re-establish project specific parameters

23. VFD shall include programmable HVAC specific application macros

24. USB Type B port for quick and easy PC Connection

25. VFD shall include the capability to adjust the following functions, while the VFD is running:

1. Speed command input.

2. Acceleration adjustment from 0 to 6000 seconds.

3. Deceleration adjustment from 0 to 6000 seconds.

4. Select from 7 preset speeds.

5. Analog monitor display.

6. Removal of digital operator.

Specifications Page 10 Variable Frequency Drives

PRODUCT OPTIONS

A. Three Contactor Manual Bypass shall be provided.

VFD and bypass package shall be NEMA 1 rated, fully pre-wired and ready for installation as a single UL listed device. Bypass shall include the following:

1. Drive output, and bypass contactors to isolate the VFD from the motor, when the motor is running in the bypass mode. These contactors shall be electrically and software interlocked to ensure safe operation.

2. 120 VAC control transformer, with fused primary.

3. Electronic motor overload relay, to display motor amps and protect the motor while operating in the bypass mode.

4. Disconnect switch, with a pad-lockable through-the-door handle mechanism.

5. Control and safety circuit terminal strip.

6. Current transformers on the output of the Drive/Bypass package for displaying motor current in both modes of operation as well as verification that the motor is running.

7. Provide BACnet , Modbus/Memobus, Siemens Apogee, Johnson Controls Metasys communication protocols as standard communication protocols as standard, with the ability to configure controller parameters view controller monitors, control I/O, clear faults and view controller status in both drive and bypass modes.

8. Door mounted control panel with; Drive/Bypass selector keys, Hand/Off/Auto selector keys, Normal/Test selector keys.

9. Door mounted control keypad with LCD display for “Control Power”, “Drive Ready”, “Drive Run”, “Drive Selected”, “Drive Fault”, “Drivel Test”, “Bypass Selected”, “Bypass Run”, “Motor OL”, ”Safety Open” “BAS Interlock”, “Auto Run”, Auto Transfer”, “Emergency Override”, “Hand Mode”, “Off Mode”, and “Auto Mode”.

10. Drive/Bypass selector keys, to allow switching between the Drive and Bypass mode.

11. Hand/Off/Auto selector keys shall provide the following operation and be programmed to operate in any of these modes upon power-up:

12. Normal/Test selector keys, to allow VFD trouble shooting while operating in bypass mode. This option is only available with the 3 contactor style bypass.

13. Hand Position - The drive is given a start command, operation is via the local speed input (digital operator/keypad). If in bypass mode, the motor is running.

14. Off Position - The start command is removed, all speed inputs are ignored, power is still applied to the drive. If in bypass mode, the motor is stopped.

15. Auto Position - The drive is enabled to receive a start command and speed input from a building automation system. If in bypass mode, the motor start/stop is controlled by the building automation system

16. Eight Programmable digital inputs (24Vdc, 8mA) shall be provided for Auto Transfer to bypass, Safety Interlock, BAS Interlock, and numerous other bypass

Specifications Page 11 Variable Frequency Drives specific functions.

17. Four Programmable form C relays (24Vdc/120 VAC, 2 Amp) for: “Motor

Run”, “Damper Actuator”, “Auto Transfer”, “Drive Run”, “Hand Mode”, “Auto Mode”, “System Fault”, “Bypass Run” or ”Serial Com Run”.

18. Damper control circuit with end of travel feedback capability. This circuit shall also include two adjustable wait time functions. One is a run delay time where the drive will operate at a preset speed before the damper opens to pressurize the system. The other time function is an interlock wait time, so if the damper has not fully opened within the specified time, a fault will be declared.

19. Line voltage sensors to monitor for brownout, blackout and single phase conditions. Fault levels for each condition must be adjustable to ensure the proper settings pursuant to each application.

20. Selectable energy savings and harmonic reduction mode. Drive automatically switches to Bypass (Across-the-line) when motor is running 60 Hz for a set time and automatically switches back when frequency reference changes.

B. Main input circuit breaker with a pad-lockable through-the-door handle mechanism, able to achieve a SCCR panel rating of 100kAIC.

C. Enclosure:

1 NEMA / UL TYPE 12 Enclosure 2 NEMA / UL TYPE 3R enclosures for outdoor installations.

D. Engraved cabinet nameplates shall be provided.

E. Additional options

1. Line reactors shall be provided on the input side of the drive for harmonic suppression.

2. RS485 communication capability for Bacnet MSTP shall be provided.

3. 18-Pulse phase shifting transformer shall be provided on: 25 HP to 150 HP @

2.06 FABRICATION

A. All standard and optional features shall be included in a single NEMA 1, plenum rated enclosure with a UL certification label.

Specifications Page 12 Variable Frequency Drives

2.07 SOURCE QUALITY CONTROL

A. In-circuit testing of all printed circuit boards shall be conducted, to insure the proper mounting and correct value of all components.

B. Final printed circuit board assemblies shall be functionally tested, via computerized test equipment. All tests and acceptance criteria shall be preprogrammed. All test results shall be stored as detailed quality assurance data.

C. All fully assembled controls shall be functionally tested, with fully loaded induction motors. The combined test data shall then be analyzed, to insure adherence to quality assurance specifications.

D. Inspect and production test, under load, each completed VFD assembly.

PART 3 EXECUTION

3.01 EXAMINATION

A. Verify that surface is suitable for VFD installation.

B. Do not install VFD until the building environment can be maintained, within the service conditions required by the manufacturer.

3.02 INSTALLATION

A. Install VFD where indicated, in accordance with manufacturer's written instructions and NEMA ICS 3.

B. Tighten accessible connections and mechanical fasteners after placing VFD.

C. Provide a nameplate label on each VFD, identifying rated horsepower, full load amperes, model number, service factor and voltage/phase rating.

3.03 FIELD QUALITY CONTROL

A. Field inspection and testing to be performed.

B. Inspect completed installation for physical damage, proper alignment, anchorage, and grounding.

3.04 MANUFACTURER'S FIELD SERVICES

A. Prepare and start systems as required by project schedule.

Specifications Page 13 Variable Frequency Drives

3.05 ADJUSTING

A. Make final adjustments to installed VFD, to assure proper operation of HVAC systems.

END OF SECTION

Specifications Page 12 Variable Frequency Drives

APPENDIX ONE

PRODUCT OPTIONS

Note to the Consulting Engineer; Select Options to be Applied to this Project, Insert in the Appropriate Specification Section

A. Two Contactor Manual Bypass shall be provided when indicated by the schedule.

installation as a single UL listed device. Bypass shall include the following:

1. Drive output, and bypass contactors, to isolate the VFD from the motor, when the motor is running in the bypass mode. These contactors shall be electrically and software interlocked to ensure safe operation.

2. 120 VAC control transformer, with fused primary.

3. Electronic motor overload relay, to display motor amps and protect the motor while operating in the bypass mode.

4. Disconnect switch, with a pad-lockable through-the-door handle mechanism.

5. Control and safety circuit terminal strip.

6. Current transformers on the output of the Drive/Bypass package for displaying motor current in both modes of operation as well as verification that the motor is running.

7. Provide BACnet , Modbus/Memobus, Siemens Apogee, Johnson Controls

Metasys communication protocols as standard, with the ability to configure controller parameters view controller monitors, control I/O, clear faults and view controller status in both drive and bypass modes.

8. Door mounted control panel with; Drive/Bypass selector keys, Hand/Off/Auto selector keys, Normal/Test selector keys.

9. Door mounted control keypad with LCD display for “Control Power”, “Drive

Ready”, “Drive Run”, “Drive Selected”, “Drive Fault”, “Drivel Test”, “Bypass

Selected”, “Bypass Run”, “Motor OL”, ”Safety Open” “BAS Interlock”, “Auto

Run”, Auto Transfer”, “Emergency Override”, “Hand Mode”, “Off Mode”, and

“Auto Mode”..

10. Drive/Bypass selector keys, to allow switching between the Drive and Bypass mode.

11. Hand/Off/Auto selector keys shall provide the following operation and be programmed to operate in any of these modes upon power-up:

Hand Position - The drive is given a start command, operation is via the local speed input (digital operator/keypad). If in bypass mode, the motor is running.

Specifications Page 13 Variable Frequency Drives

Off Position - The start command is removed, all speed inputs are ignored, power is still applied to the drive. If in bypass mode, the motor is stopped.

Auto Position - The drive is enabled to receive a start command and speed input from a building automation system. If in bypass mode, the motor start/stop is controlled by the building automation system

12. Eight Programmable digital inputs (24Vdc, 8mA) shall be provided for Auto

Transfer to bypass, Safety Interlock, BAS Interlock, and numerous other bypass specific functions.

13. Four Programmable form C relays (24Vdc/120 VAC, 2 Amp) for: “Motor

Run”, “Damper Actuator”, “Auto Transfer”, “Drive Run”, “Hand Mode”, “Auto

Mode”, “System Fault”, “Bypass Run” or ”Serial Com Run”.

14. Damper control circuit with end of travel feedback capability. This circuit shall also include two adjustable wait time functions. One is a run delay time where the drive will operate at a preset speed before the damper opens to pressurize the system. The other time function is an interlock wait time, so if the damper has not fully opened within the specified time, a fault will be declared.

15. Line voltage sensors to monitor for brownout, blackout and single phase conditions. Fault levels for each condition must be adjustable to ensure the proper settings pursuant to each application.

16. Selectable energy savings and harmonic reduction mode. Drive automatically

B. Three Contactor Manual Bypass shall be provided when indicated by the schedule.

installation as a single UL listed device. Bypass shall include the following:

1. Drive output, and bypass contactors to isolate the VFD from the motor, when the motor is running in the bypass mode. These contactors shall be electrically and software interlocked to ensure safe operation.

2. 120 VAC control transformer, with fused primary.

3. Electronic motor overload relay, to display motor amps and protect the motor while operating in the bypass mode.

4. Disconnect switch, with a pad-lockable through-the-door handle mechanism.

5. Control and safety circuit terminal strip.

6. Current transformers on the output of the Drive/Bypass package for displaying motor current in both modes of operation as well as verification that the motor is running.

7. Provide BACnet , Modbus/Memobus, Siemens Apogee, Johnson Controls

Metasys communication protocols as standard communication protocols as standard, with the ability to configure controller parameters view controller monitors, control I/O, clear faults and view controller status in both drive and bypass modes.

Specifications Page 14 Variable Frequency Drives

8. Door mounted control panel with; Drive/Bypass selector keys, Hand/Off/Auto selector keys, Normal/Test selector keys.

9. Door mounted control keypad with LCD display for “Control Power”, “Drive

Ready”, “Drive Run”, “Drive Selected”, “Drive Fault”, “Drivel Test”, “Bypass

Selected”, “Bypass Run”, “Motor OL”, ”Safety Open” “BAS Interlock”, “Auto

Run”, Auto Transfer”, “Emergency Override”, “Hand Mode”, “Off Mode”, and

“Auto Mode”.

10. Drive/Bypass selector keys, to allow switching between the Drive and Bypass mode.

11. Hand/Off/Auto selector keys shall provide the following operation and be programmed to operate in any of these modes upon power-up:

12. Normal/Test selector keys, to allow VFD trouble shooting while operating in bypass mode. This option is only available with the 3 contactor style bypass.

13. Hand Position - The drive is given a start command, operation is via the local speed input (digital operator/keypad). If in bypass mode, the motor is running.

14. Off Position - The start command is removed, all speed inputs are ignored, power is still applied to the drive. If in bypass mode, the motor is stopped.

15. Auto Position - The drive is enabled to receive a start command and speed input from a building automation system. If in bypass mode, the motor start/stop is controlled by the building automation system

16. Eight Programmable digital inputs (24Vdc, 8mA) shall be provided for Auto

Transfer to bypass, Safety Interlock, BAS Interlock, and numerous other bypass specific functions.

17. Four Programmable form C relays (24Vdc/120 VAC, 2 Amp) for: “Motor

Run”, “Damper Actuator”, “Auto Transfer”, “Drive Run”, “Hand Mode”, “Auto

Mode”, “System Fault”, “Bypass Run” or ”Serial Com Run”.

18. Damper control circuit with end of travel feedback capability. This circuit shall also include two adjustable wait time functions. One is a run delay time where the drive will operate at a preset speed before the damper opens to pressurize the system. The other time function is an interlock wait time, so if the damper has not fully opened within the specified time, a fault will be declared.

19. Line voltage sensors to monitor for brownout, blackout and single phase conditions. Fault levels for each condition must be adjustable to ensure the proper settings pursuant to each application.

20. Selectable energy savings and harmonic reduction mode. Drive automatically

Specifications Page 15 Variable Frequency Drives

C. Redundant Drive Package shall be provided when indicated by the schedule. Two

VFD drives (Drive A, Drive B) shall be supplied in a NEMA 1 rated, fully pre-wired and ready for installation as a single UL listed device. Redundant drive package shall include the following as standard:

1. Lockable main input disconnect switch.

2. Semiconductor fuses for each VFD.

3. Output contactor for each VFD

4. 115V control transformer and transfer logic.

5. Damper control circuit with end of travel feedback with two adjustable wait time functions.

6. “Fault Transfer” selector switch

7. “Drive A -Auto - Drive B” selector switch.

8. “Hand-Off-Auto” selector switch.

9. “External Fault” pilot light.

10. “Drive A Fault” pilot light.

11. “Drive B Fault” pilot light.

12. “Drive A Run” pilot light.

13. “Drive B Run” pilot light.

14. Single power input/output wiring points

15. Single control wiring points

16. Two door mounted drive control keypads.

D. Main input circuit breaker with a pad-lockable through-the-door handle mechanism, able to achieve a SCCR panel rating of 100kAIC.

E. Enclosure:

1 NEMA / UL TYPE 12 Enclosure

2 NEMA / UL TYPE 3R enclosures for outdoor installations.

F. Engraved cabinet nameplates shall be provided.

MAHG181062 Revised Variable Frequency Drive Specification RevisionA 12192019