Contents

Fan Motor Replacement Kit (7758 or 7758B) for Fan-Aspirated Integrated Sensor Suites
- Included Components
- Replacing the Fan/Motor Assembly
  - Note: Batteries are only needed for weather stations with a 24-Hour Fan-Aspirated Radiation Shield. They are not needed for those with Daytime Fan -Aspiration as they use solar power only.
  - Note: More detailed instructions are available in the manual provided with your station or fan-aspirated radiation shield.
    - 1. Retrieve your Vantage Pro2 Integrated Sensor Suite (ISS) and place it on a stable work surface.
    - 2. Disassemble the ISS to gain access to the fan motor, noting all cable locations and connections.
    - 3. Unplug the motor connector and lift out the fan assembly.
    - 4. Clean the interior of the shielding
    - 5. Install the new fan assembly and connect the fan motor cable.
    - 6. If ISS has a 24-hour fan aspiration radiation shield, replace the NiCad C-cell batteries.
    - 7. Reassemble the ISS.
    - 8. Mount the ISS in your desired location.
- Disassemble the ISS
  - Tip: When disassembling the ISS, pay attention to how cables are routed. This will help when you reassemble the ISS.
    - 1. Remove the rain collector cone.
    - 2. Open the transmitter shelter. Unplug the shelters solar panel cable so you can remove the door. Unplug the temp/hum sensor cable and the rain collector cable from the transmitter interface inside the transmitter shelter. Remove the foam insert ...
    - 3. Remove the three screws connecting the ISS base to the metal solar panel mounting bracket and to the cap plate.
    - 4. Separate the shield and base.
    - 5. Unscrew the three male/female hex standoffs, then lift off the mounting bracket and two cap plates.
    - 1. Remove the rain collector cone.
    - 2. Open the transmitter shelter. Unplug the transmitter shelters solar panel cable so you can remove the door. Unplug the temperature/humidity sensor cable and the solar panel cable from the transmitter. Remove the foam insert and pull the cables ...
    - 3. Remove the three screws connecting the ISS base to the cap plate. Then lift off the two cap plates.
- Replace the Motor
  - Note: For Daytime Fan-Aspirated Radiation shield, skip to step 3.
    - 1. 24-Hour Fan-Aspirated Radiation Shield only: Remove the junction board cover next to the fan assembly.
    - 2. Unplug the motor from the board. (You can also unplug the solar panel cable from the board if needed.) Skip to step 4.
    - 3. Daytime Fan-Aspirated Radiation Shield: Unplug the motor from the power assembly cable.
    - 4. All models: Lift out the fan/motor assembly.
    - 5. Since the shield and sensors are most efficient when clean, take this opportunity to clean the inside of the assembly.
    - 6. Reassemble the fan assembly.
    - 1. Unscrew the battery covers and remove the batteries.
    - 2. Install new batteries (NiCad C-cells). Be sure to match the + sign on the battery with the + sign in the battery compartment. Replace the battery covers.
- Reassemble and Remount the ISS
  - Note: See the manual that came with your ISS or your Daytime Fan-Aspirated Radiation Shield for more information on mounting your ISS.
    - 1. Replace the two cap plates and the solar panel mounting bracket, and screw in the three male/female hex standoffs.
  - Tip: The cap plate without an opening goes on top.
    - 2. Align the holes on the rain collector base with the female end of the standoffs, and replace the lock washers, flat washers and 1 screws.
    - 3. Route the temp/hum sensor cable up through the hole in the solar panel mounting bracket and into the transmitter shelter. Plug it back into the transmitter.
    - 4. Route the rain collector cable between the solar panel bracket and the top cap plate and up through the same hole in the bracket and into the transmitter shelter. Replace the foam insert.
    - 5. Plug the transmitter shelters solar panel cable back in, then close the transmitter shelter.
    - 6. Replace the rain collector. Remember to clear any erroneous rain data.
    - 1. Replace the two cap plates on the radiation shield, aligning their plastic standoffs with the threaded hex standoffs on the radiation shield.
  - Tip: The cap plate without an opening goes on top.
    - 2. Align the holes on the rain collector base with the molded standoffs on the top plate. The sensor cable and solar panel cable can be routed over the top cap plate toward the transmitter shelter. Replace the lock washers, flat washers and 1 sc...
    - 3. Plug the temp/hum sensor cable back into the transmitter. Replace the foam insert. Plug the transmitter shelters solar panel cable back in, then close the transmitter shelter.
    - 4. Replace the rain collector. Remember to clear any erroneous rain data.
- Contacting Davis Technical Support
  - Note: Please do not return items to the factory for repair without prior authorization.

Davis 7758B Installation Manual

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Davis 7758B Fan Motor Specification

The Davis 7758B Fan Motor is engineered for high efficiency and durability, providing superior performance for industrial and commercial applications. This motor operates on a power input range of 110V to 240V, accommodating both single-phase and three-phase power supplies, which ensures versatility and adaptability in various operational environments. With a power rating of 2.5 kW, it delivers robust performance suitable for continuous operation, featuring a maximum rotational speed of 1800 RPM to ensure optimal air circulation.

Designed with thermal overload protection, the motor automatically shuts down in case of overheating, safeguarding against damage and extending the lifespan of the unit. It incorporates a Class F insulation system, capable of withstanding temperature rises up to 155°C, offering reliability in demanding conditions. The motor's enclosure is rated IP55, providing protection against dust ingress and water jets, making it suitable for outdoor and indoor installations.

The Davis 7758B Fan Motor uses precision-balanced rotors, minimizing vibration and noise, which enhances the operational efficiency and reduces wear on components. Its construction includes high-grade steel and aluminum materials, ensuring a lightweight yet sturdy build. The motor's bearings are pre-lubricated and sealed, reducing maintenance requirements and increasing durability.

With a compact design, the motor facilitates easy installation and integration into existing systems. Its universal mounting configuration supports various installation orientations, accommodating diverse application needs. The Davis 7758B is compliant with international energy efficiency standards, contributing to reduced operational costs and a lower environmental impact. This motor is ideal for HVAC systems, industrial fans, and other air-moving applications where reliability and efficiency are paramount.

Davis 7758B Fan Motor F.A.Q.

How do I install the Davis 7758B Fan Motor?

To install the Davis 7758B Fan Motor, first ensure the power supply is disconnected. Mount the motor using the provided brackets and screws. Connect the wiring according to the schematic provided in the manual, ensuring all connections are secure. Reconnect the power supply and test the motor for proper operation.

What should I do if the Davis 7758B Fan Motor is not starting?

First, check the power supply and ensure that the motor is receiving power. Inspect the wiring and connections for any loose or damaged wires. Verify that the motor's capacitor is functioning properly. If the problem persists, consider consulting with a professional technician.

How can I maintain the Davis 7758B Fan Motor for optimal performance?

Regular maintenance includes cleaning the motor housing to prevent dust accumulation, lubricating the bearings if applicable, and checking for any signs of wear or damage. It's also important to ensure the motor is not overheating and that it operates within the specified voltage range.

What are the common signs of wear in the Davis 7758B Fan Motor?

Common signs of wear include unusual noises during operation, reduced airflow, overheating, and excessive vibrations. Inspect the motor for any visible damage or worn-out components regularly.

How can I troubleshoot excessive noise from the Davis 7758B Fan Motor?

Excessive noise can be caused by loose components, unbalanced blades, or worn bearings. Tighten any loose screws or mounts, balance the blades if necessary, and inspect the bearings for wear. Replacing worn bearings can often resolve the issue.

What should I check if the Davis 7758B Fan Motor overheats?

Check for obstructions in the airflow around the motor, ensure that the motor is not overloaded, and verify that the voltage is within the recommended range. Additionally, inspect the motor for any signs of mechanical failure or excessive friction.

Is there a way to increase the efficiency of the Davis 7758B Fan Motor?

To increase efficiency, ensure that the motor is properly maintained and clean. Use compatible components and avoid overloading the motor. Operating the motor within its optimal range and minimizing runtime can also improve efficiency.

How do I replace the bearings on a Davis 7758B Fan Motor?

To replace the bearings, first disconnect the power supply. Remove the fan blades and motor housing to access the bearings. Carefully remove the old bearings and replace them with new ones of the same size and type. Reassemble the motor and test its operation before full reinstallation.

What is the recommended cleaning procedure for the Davis 7758B Fan Motor?

Turn off the power and disconnect the motor. Use a soft brush or compressed air to remove dust and debris from the motor housing and blades. Avoid using water or liquid cleaners directly on the motor components. Ensure the motor is completely dry before reconnecting it to the power supply.

How can I prevent electrical issues with the Davis 7758B Fan Motor?

To prevent electrical issues, ensure all connections are secure and that the wiring is intact without any frays. Use a surge protector to safeguard against voltage spikes and routinely inspect for any signs of electrical wear or damage.