United CoolAir VFD Installation, Operation And Maintenance Manual

Variable Frequency Drive

DISCONTINUED

For Reference Only

Field Installation

Installation, Operation and Maintenance Manual

Effective December 2018

***Interactive PDF***

Installation, Operation and Maintenance Manual

Field Installed Variable Frequency Drives (VFD’s

Contents

Important Notice �� 3

Use of Symbols �� 3

ELECTRICAL HAZARD �� 3

WARNING �� 3

CAUTION �� 3

INFORMATION �� 3

General Information �� 4

Inspection of Equipment �� 4

Handling �� 4

Location �� 4

Programming �� 4

Voltage Unbalance ��5

Field Provided VFD / Field Installed �� 6

Field Provided VFD / Field Installed (Continued) �� 7

Static Pressure Transducer �� 7

Field or Factory Provided/Field Installed �� 7

Field Provided VFD / Field Installed (Continued) �� 8

Factory Provided VFD / Field Installed �� 9

Field Provided VFD / Field Installed (Continued) �� 10

LIMITED WARRANTY �� 12

FACTORY TESTED �� 12

Subject to change without notice. 120.7-IM (1218)

2

Installation, Operation and Maintenance Manual

Field Installed Variable Frequency Drives (VFD’s

Important Notice

This manual is the property of the owner.

Please be sure to leave it with the owner when you leave the job.

Use of Symbols

This publication includes warnings, cautions and information icons that point out safety related issues or conditions as well as other pertinent information relative to a safe installation, service or maintenance situation� The following icons should be interpreted as follows:

ELECTRICAL HAZARD

WARNING

CAUTION

INFORMATION

The electrical hazard icon indicates the presence of an electrical hazard which could result in electrical shock or death�

The warning icon indicates a potentially hazardous situation which could result in death or serious bodily injury if not avoided�

The caution icon indicates a potentially hazardous situation which may result in minor or moderate injury if not avoided�

The information icon indicates a situation that may result in equipment or property damage� The information provided alerts the reader to relevant facts and/or conditions�

Subject to change without notice. 120.7-IM (1218)

3

Installation, Operation and Maintenance Manual

Field Installed Variable Frequency Drives (VFD’s

General Information

Inspection of Equipment

Upon receiving of the variable frequency drive (VFD), carefully inspect for visible or concealed interior/exterior damage� If damage occurred during transit, contact the

freight carrier immediately and le a damage claim report.

Inspect the unit data plate to verify the VFD is the appropriate one for the application� (Voltage, VFD and Evaporator Motor HP are compatible)

Some options/accessory items may have been shipped loose in one or more boxes� These may have been delivered to another location, or possibly within the unit� If shipped with

the unit there will be a sticker that identies where in the unit the shipped loose items are located. Conrm that all of

these options/accessory items are also available and that no damage has occurred�

Handling

Handle the VFD as prescribed by the VFD manufacturer�

Location

Before VFD can be installed, a thorough study should be made� Attention must be given to:

A. Wall, panel or structure load limitations are appropriate

B. Required service clearances are present

C. Location of wiring and safety devices is acceptable

D. Temperature and humidity levels will be within

manufacturer tolerances

E. Mounting location is as recommended by the VFD

manufacturer

F. Conrm that the mounting location will not subject the

VFD to any moisture

G. Make sure that adequate ventilation is provided as

recommended by the VFD manufacturer

H. Device will not be located near heat radiating elements

I. Make sure all power wiring and control wiring can be

separated per industry accepted practices

Programming

Refer to the manual with the VFD for programming and troubleshooting instructions�

INFORMATION

Conrm that the incoming power supply

matches the unit and VFD data tags�

ELECTRICAL HAZARD

Only a qualied licensed electrician or

other individual that is properly trained in handling live electrical components should perform any installation, adjustment, repair or maintenance� Failure to follow all electrical safety precautions and industry accepted practices when exposed to live electrical components could result in death or serious injury�

INFORMATION

Use Copper Conductors Only� Failure to use copper conductors may result in equipment damage�

INFORMATION

All electrical wiring must be in accordance with NEC (National Electrical Code), NFPA (National Fire Protection Agency) most current versions as well as any applicable state or local codes�

INFORMATION

The correct phase sequence of the incoming power supply is a requirement� If the phase sequence is not correct it could cause damage or failure to electrical components� Reverse the incoming wiring to resolve the issue� Do not switch any internal unit wiring�

INFORMATION

Unit wiring and components have been

designed for the specic unit application

and factory assigned controls� Do not use the unit transformers or alter the unit wiring

to interface any eld supplied accessories

or controls�

Subject to change without notice. 120.7-IM (1218)

4

Installation, Operation and Maintenance Manual

Field Installed Variable Frequency Drives (VFD’s

ELECTRICAL HAZARD

Disconnect all power before servicing the drive controller� WAIT ONE MINUTE until DC bus capacitors discharge, then measure DC bus capacitor voltage to verify that DC voltage is less than 45 volts�

ELECTRICAL HAZARD

DO NOT short across any internal components or touch unshielded components � Use of electrically insulated tools is required�

ELECTRICAL HAZARD

Equipment must be properly grounded per all applicable national and local codes� Refer to the VFD manufacturers manual

for specic grounding details.

ELECTRICAL HAZARD

Make sure all covers and doors are closed before applying power or starting the VFD�

Voltage Unbalance

Voltage unbalance occurs when the RMS line voltages on a 3-phase power supply are unequal� Voltages are never balanced between phases, but if the level of the unbalance becomes excessive it will create problems for not only motors but also controls�

The maximum desirable voltage unbalance is 2�0%�

When testing for voltage unbalance, the phase-to-phase voltages should be measured rather than the phase-to neutral voltages since 3-phase motors are connected across phases� Use the following formula to determine the percent of voltage unbalance:

Percent Voltage Unbalance = 100 x (Maximum Voltage Deviation / Average Voltage)

Example:

Phase-Phase voltages

A-8 = 479V

8-C = 472V

C-A = 450V

Average Voltage = (479 + 472 + 450) / 3 = 467

Maximum Voltage Deviation from Average =

467 - 450 = 17 (Must always be positive)

Voltage Unbalance = 100 x (17/467) = 3�6%

In this example the percent of voltage unbalance exceeds the desired maximum of 2%� Additional checks should be made

at the unit disconnect to conrm the values. Use accepted

industry practices to check or test the quality of the power supply � Often, it is just a matter of repairing malfunctioning equipment or redistributing loads to improve the unbalance�

If no cause can be located and resolved for the unit power

supply, the building manager or owner should be notied of

the issue to get the proper power supplied to the unit�

It should be noted that the inclusion of a variable frequency drive (VFD) with an unbalanced power supply may result in nuisance tripping and 3rd harmonic currents�

Subject to change without notice. 120.7-IM (1218)

5

Field Provided VFD / Field Installed

1. Turn off all power to the unit�

2. Locate and remove the access panel for the

evaporator�

3. Locate the evaporator blower motor�

4. Locate the wiring to the motor and follow back to the

two (2) sets of power blocks (Refer to Figure 1A or 1B)

NOTE: Refer to Electrical Schematic provided with the unit

for specic power block ID.

5. Remove the jumpers from between the power blocks� Make note of the motor side power block to prevent wiring the VFD backwards� (Refer to Figure 1A or 1B)

WARNING

Installation, Operation and Maintenance Manual

Field Installed Variable Frequency Drives (VFD’s

Severe damage and personal injury may result if jumpers are not removed�

INFORMATION

All eld supplied wiring is to be sized per

NEC or applicable local codes�

6. Attach the appropriate size wire to the power block (motor side) and connect them to the terminals on the VFD marked for the Motor (U, V & W) (Refer to Figure 2A or 2B)�

INFORMATION

Damage to VFD may occur if not correctly wired�

7. Install a circuit breaker for VFD protection between the VFD and the entering power block (Refer to Figure 2A or 2B)� Size the circuit breaker according to VFD manufacturer recommendation�

Figure 1A - Before VFD Installed Motor w/ Overload

Subject to change without notice. 120.7-IM (1218)

Figure 1B - Before VFD Installed Motor w/o Overload

6

Installation, Operation and Maintenance Manual

Field Installed Variable Frequency Drives (VFD’s

Field Provided VFD / Field Installed

(Continued)

8. Attach the appropriate size wire to the circuit breaker

and connect them to the terminals on the VFD marked for Mains (L1, L2, & L3) (Refer to Figure 2A or 2B)�

9. Attach the appropriate size wire to the circuit breaker and connect them to the terminals on the entering power block marked for power entering (L1, L2, & L3) (Refer to Figure 2A or 2B)�

10. Secure all wiring�

11. Replace access panel back on the evaporator section�

12. Turn on power to unit�

13. Program VFD per the manufacturers instructions�

Static Pressure Transducer Field or Factory Provided/Field Installed

ELECTRICAL HAZARD

Only a qualied licensed electrician or

other individual that is properly trained in handling live electrical components should perform any installation, adjustment, repair or maintenance� Failure to follow all electrical safety precautions and industry accepted practices when exposed to live electrical components could result in death or serious injury�

INFORMATION

3. Route the pneumatic tubing to a point approximately 2/3rds of the distance down the straightest length of supply air ducting� Make certain that there are no kinks in the tubing� Use clamps to hold the tubing into place�

4. Drill a clearance hole into the center face of one side of the duct work�

5. The end of the pneumatic tubing must be cut square to the tube side wall for the tube to pick up the correct air pressure reading�

6. Insert approximately 1/8” of the tubing into the duct.

Make sure the tubing is positioned in the duct at a right

angle so that the air ow goes across the square end of

the tube�

INFORMATION

Damage to the Static Pressure Transducer may occur if not wired correctly�

7. Terminals are type sensitive. Power input to the “+” terminal must be 10 VDC. Output from the “-” terminal

is 4 - 20 mA to the VFD analog input�

8. Use 18 AWG wire size to connect from the (-) and (+) terminals of the pressure transducer back to the VFD� (Refer to Figure 3)

9. The terminal markings on the VFD can vary from one manufacturer to another� Refer to the VFD manufacturer instructions for the proper terminal connections�

10. Static Pressure Transducers are typically preset to read

from O” to 2.5” W.C. The VFD controller will read the preset conguration and will accelerate or decelerate the motor to maintain the programmed conguration.

Use Copper Conductors Only� Failure to use copper conductors may result in equipment damage�

The Static Pressure Transducer (SPT) is eld installed

external to the main electrical panel and wired back to the VFD�

1. Mount the transducer in a vertical position, making sure that the pneumatic tube connections are at the bottom� This helps to prevent moisture from reaching the transducer�

2. Attach eld supplied pneumatic tubing to the “HIGH”

connection of the transducer � (Refer to Figure 3)

Subject to change without notice. 120.7-IM (1218)

Figure 3 - Static Pressure Transducer

7

Field Provided VFD/Field Installed (Continued)

Installation, Operation and Maintenance Manual

Field Installed Variable Frequency Drives (VFD’s

Figure 2A - After VFD Installed Motor w/ Overload

Figure 2B - After VFD Installed Motor w/o Overload

Subject to change without notice. 120.7-IM (1218)

8

Factory Provided VFD/Field Installed

1. Turn off all power to the unit�

2. Locate and remove the access panel for the

evaporator�

3. Locate the evaporator blower motor�

4. Locate the wiring to the motor and follow back to the

two (2) sets of power blocks (Refer to Figure 3A or 3B)�

NOTE: Refer to Electrical Schematic provided with the unit

for specic power block ID.

5. Remove the jumpers from between the power blocks� Make note of the motor side power block to prevent wiring the VFD backwards� (Refer to Figure 3)

WARNING

Installation, Operation and Maintenance Manual

Field Installed Variable Frequency Drives (VFD’s

Severe damage and personal injury may result if jumpers are not removed�

6. Attach the appropriate size wire to the power block (motor side) and connect them to the terminals on the VFD marked for the motor (U, V & W) (Refer to Figure 4)�

INFORMATION

Damage to VFD may occur if not correctly wired�

7. Attach the appropriate size wire to the line side power block and connect them to the terminals on the VFD marked for Line Voltage (L1, L2, & L3) (Refer to Figure 4A or 4B)�

8. Secure all wiring per industry accepted practices�

9. Replace access panel back on the evaporator section�

10. Turn on power to the unit�

Figure 3A - Before VFD Installed Motor w/ Overload

Subject to change without notice. 120.7-IM (1218)

Figure 3B - Before VFD Installed Motor w/o Overload

9

Field Provided VFD/Field Installed (Continued)

Installation, Operation and Maintenance Manual

Field Installed Variable Frequency Drives (VFD’s

Figure 4A - After VFD Installed Motor w/ Overload

Figure 4B - After VFD Installed Motor w/o Overload

Subject to change without notice. 120.7-IM (1218)

10

NOTES:

Installation, Operation and Maintenance Manual

Field Installed Variable Frequency Drives (VFD’s

Subject to change without notice. 120.7-IM (1218)

11

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LIMITED WARRANTY

United CoolAir Units are backed by a 1 year limited warranty on parts and a 5 year limited warranty on the compressor (labor not

included). Maintenance items such as lters and belts are excluded

under this limited warranty�

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491 East Princess Street, York, PA 17403 Phone: 717-843-4311 Fax: 717-854-4462

email: [email protected] web: www.unitedcoolair.com

Manufacturer reserves the right to make changes without notice.

FACTORY TESTED

All units are functionally run tested before shipment to ensure a trouble-free start-up and unit commissioning� Industry proven components are used throughout to enhance system reliability and peace of mind�

120.7-IM (1218)