Lennox 24B69 VFD Replacement Kit Instruction Manual
WARNING
Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury or loss of life. Installation and service must be performed by a licensed professional HVAC installer or equivalent, service agency, or the gas supplier.
WARNING
ELECTRICAL SHOCK HAZARD.
Failure to follow instructions exactly could result in serious injury or death.
VFD HOLDS A POTENTIALLY LETHAL CHARGE UP TO 10 MINUTES AFTER POWER HAS BEEN DISCONNECTED. Do not open VFD cover until 10 minutes AFTER power source has been disconnected and power lamp has turned off.
Read manual provided by VFD manufacturer. Carefully review and follow all safety warnings in that manual also.
CAUTION
As with any mechanical equipment, contact with sharp sheet metal edges can result in personal injury. Take care while handling this equipment and wear gloves and protective clothing.
Shipping and Packing List
Package 1 of 1 contains:
1- Pre-programmed VFD (A96 or A137)
4- Wire harnesses
WARNING
ELECTRICAL SHOCK HAZARD.
STOP! Before you continue, make sure that power to the VFD has been off for at least 10 minutes. The capacitor in the VFD holds high voltage power for up to 10 minutes after power has been disconnected.
Application
Kits are used to replace the variable frequency drive (VFD) in LG/LC/LH/LD, SG/SC, KG/KC/KH, EL series units. See TABLE 1 for VFDs without MODBUS cables and TABLE 2 for VFDs with MODBUS cables.
TABLE 1 NO MODBUS
| HP Rating | Voltage | Kit Number | Catalog Number |
| 2HP | 230V | 622785-26 | 24B69 |
| 460V | 622785-27 | 24B70 | |
| 575V | 622785-36 | 24B82 | |
| 3HP | 230V | 622785-28 | 24B71 |
| 460V | 622785-29 | 24B72 | |
| 575V | 622785-37 | 24B83 | |
| 5HP | 230V | 622785-30 | 24B73 |
| 460V | 622785-31 | 24B74 | |
| 575V | 622785-38 | 24B84 | |
| 7.5HP | 230V | 622785-32 | 24B75 |
| 460V | 622785-33 | 24B76 | |
| 575V | 622785-39 | 24B85 | |
| 10HP | 230V | 622785-34 | 24B77 |
| 460V | 622785-35 | 24B78 | |
| 575V | 622785-40 | 24B86 |
Replacing D700 Drives
This kit contains an E800 series drive. When replacing a D700 drive with the E800 drive provided in this kit, use kit harnesses as shown in TABLE 3.
WARNING
To prevent serious injury or death:
- Lock-out/tag-out before performing maintenance.
- If system power is required (e.g., smoke detector maintenance), disable power to blower, remove fan belt where applicable, and ensure all controllers and thermostats are set to the “OFF” position before performing maintenance.
- Always keep hands, hair, clothing, jewelry, tools, etc., away from moving parts.
TABLE 2 WITH MODBUS
| HP Rating | Voltage | Kit Number | Catalog Number |
| 2HP | 230V | 622785-26 | 24B69 |
| 460V | 622785-27 | 24B70 | |
| 575V | 622785-36 | 24B82 | |
| 3HP | 230V | 622785-28 | 24B71 |
| 460V | 622785-29 | 24B72 | |
| 575V | 622785-37 | 24B83 | |
| 5HP | 230V | 622785-30 | 24B73 |
| 460V | 622785-31 | 24B74 | |
| 575V | 622785-38 | 24B84 | |
| 7.5HP | 230V | 622785-32 | 24B75 |
| 460V | 622785-33 | 24B76 | |
| 575V | 622785-39 | 24B85 | |
| 10HP | 230V | 622785-34 | 24B77 |
| 460V | 622785-35 | 24B78 | |
| 575V | 622785-40 | 24B86 |
TABLE 3 D700 TO E800 REPLACEMENT HARNESSES
| Unit | Harness |
| LGH/LCH | 616709-02 |
| KG/KC/KH 156-300 | 106074-02 |
| KG/KC/KH 092-150 & EL | 107403-02 |
| ZG/ZC/ZH 092-150 | 106437-02 |
FIGURE 1 VFD LOCATION SPLIT SYSTEM AIR HANDLER
FIGURE 2 VFD LOCATION-EL SPLIT SYSTEM AIR HANDLER
FIGURE 3 SUPPLY AIR VARIABLE FREQUENCY DRIVE 420, 480, 540, & 600 UNITS
FIGURE 4 POWER EXHAUST VARIABLE FREQUENCY DRIVE 420, 480, 540, & 600 UNITS
VFD LOCATION
FIGURE 5 LGH/LCH/092-150 LGX/LCX/LHX092-150 KG/KC/KH 092-150
SG/SC120
LGH/LCH156-300S KG/KC/KH 180-300
LGH/LCH242H-360H SGC/SCC240 & 288
FIGURE 6 LC/LG/LH/LD 156-360, SC/SG240
Installation No MODBUS
- Disconnect all power to unit and WAIT AT LEAST 10 MINUTES before opening the VFD cover. See FIGURE 1 through FIGURE 6 for location.
- Open the lower cover on the VFD to access wire connections. Disconnect the wires from the terminals, making special note of the wire color and stamping that was connected to each terminal. See FIGURE 7 through FIGURE 10.
- Remove the top two screws which secure the existing VFD to the mounting bracket. Loosen the lower two securing screws and remove the existing VFD from the controls compartment.
NOTE – It is not necessary to completely remove the two lower screws to remove the VFD.
NOTE – If the existing VFD is model E520 or E540 it may be necessary to drill new mounting holes in the VFD mounting plate. The model number is located on the VFD nameplate. - Slide keyholes on replacement VFD over lower securing screws. Reinsert and tighten two upper screws, then tighten lower screws.
WARNING
Power wiring must be connected properly. Improperly connected power wiring may result in damage to the VFD. - Carefully connect existing wires to the replacement VFD. On units without harnesses, take care to properly connect the power wiring going into and out of the VFD.
- Close access panel and restore power to the unit.
WIRING CONNECTIONS
FIGURE 7 LGH/LCH156-300S
WARNING!
DO NOT OPEN VFD COVER UNTIL POWER TO VFD HAS BEEN OFF FOR AT LEAST 10 MINUTES. VFD CAPACITOR HOLDS DANGER-OUS HIGH VOLTAGE CHARGE. FAILURE TO FOLLOW WARNINGS COULD RESULT IN SERIOUS INJURY OR DEATH.
FIGURE 8 LGH/LCH092-150 & 242H-360H; SGC/SCC120-288; LGH/LCH420-600
WARNING!
DO NOT OPEN VFD COVER UNTIL POWER TO VFD HAS BEEN OFF FOR AT LEAST 10 MINUTES. VFD CAPACITOR HOLDS DANGER-OUS HIGH VOLTAGE CHARGE. FAILURE TO FOLLOW WARNINGS COULD RESULT IN SERIOUS INJURY OR DEATH.
FIGURE 9 KG/KC/KH 180-300
FIGURE 10 EL 072-240XA & KG/KC 092-150
Installation With MODBUS Cable
- Disconnect all power to unit and WAIT AT LEAST 10 MINUTES before opening the VFD cover. See figure 10 for location.
- Mark the wires leading to the terminal block on the bottom of the VFD with appropriate terminal name.
Disconnect wires from the terminal block. See FIGURE 11. - Disconnect MODBUS from VFD.
- Remove and retain four screws securing VFD to control panel.
- Install the replacement VFD and secure with retained screws.
- Reconnect MODBUS cable and terminal block wires.
- Restore power to the unit.
FIGURE 11 DISCONNECT WIRING
Verify Proper Operation – All Units
If the blower is not rotating in the proper direction:
- Disconnect all power to the unit and open the compressor / controls compartment access panel.
- Reverse any two power wires going from the VFD to the blower motor.
- Check all field wiring to the VFD. No wires should be connected to TB2-STR.
- Check to ensure that wiring connections are secure.
- Close access panel and restore power to unit.
Verify proper operation of VFD:
Refer to staged supply air blower unit start-up instructions in unit installation instructions.
NOTE – Operate unit in the heating mode or mode which operates at the highest blower speed. Measure amp draw to blower motor between the VFD and blower motor. Verify that the amperage does not exceed the FLA value listed on the motor nameplate.
Documents / Resources
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Lennox 24B69 VFD Replacement Kit [pdf] Instruction Manual 24B69, 24B70, 24B82, 24B71, 24B72, 24B83, 24B73, 24B74, 24B84, 24B75, 4B76, 24B85, 24B77, 24B78, 24B86, 24B69 VFD Replacement Kit, 24B69, VFD Replacement Kit, Replacement Kit |
