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United CoolAir VFD, Installation, Operation And Maintenance Manual

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United CoolAir VFD Installation, Operation And Maintenance Manual Download Page 10

Installation, Operation and Maintenance Manual

Field Installed Variable Frequency Drives (VFD’s

10

Subject to change without notice.

120.7-IM (1218)

Field Provided VFD/Field Installed 

(Continued)

Figure 4A - After VFD Installed Motor  w/ Overload

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

Summary of Contents for VFD

Page 1: ...Variable Frequency Drive Field Installation Installation Operation and Maintenance Manual Effective December 2018 Interactive PDF DISCONTINUED For Reference Only ...

Page 2: ...ION 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...

Page 3: ...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 ELECTRICAL HAZARD WARNING CAUTION INFORMATION This publication includes warnings cautions and information icons that point out safety related issues or conditions as well...

Page 4: ...ect 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 Confirm that the incom...

Page 5: ...m 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 47...

Page 6: ...f the motor side power block to prevent wiring the VFD backwards Refer to Figure 1A or 1B WARNING Severe damage and personal injury may result if jumpers are not removed INFORMATION All field 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 ...

Page 7: ...n making sure that the pneumatic tube connections are at the bottom This helps to prevent moisture from reaching the transducer 2 Attach field supplied pneumatic tubing to the HIGH connection of the transducer Refer to Figure 3 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 t...

Page 8: ...nual Field Installed Variable Frequency Drives VFD s 8 Subject to change without notice 120 7 IM 1218 Field Provided VFD Field Installed Continued Figure 2A After VFD Installed Motor w Overload Figure 2B After VFD Installed Motor w o Overload ...

Page 9: ...motor side power block to prevent wiring the VFD backwards Refer to Figure 3 WARNING 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...

Page 10: ...nual Field Installed Variable Frequency Drives VFD s 10 Subject to change without notice 120 7 IM 1218 Field Provided VFD Field Installed Continued Figure 4A After VFD Installed Motor w Overload Figure 4B After VFD Installed Motor w o Overload ...

Page 11: ...Installation Operation and Maintenance Manual Field Installed Variable Frequency Drives VFD s 11 Subject to change without notice 120 7 IM 1218 NOTES ...

Page 12: ...or All Indoor HVAC Projects Authorized Distributor 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 filters and belts are excluded under this limited warranty FACTORY TESTED All units are functionally run tested before shipment to ensure a trouble free start up and uni...

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