Cabinet-Model Control Panels
The cabinet-model electronic air cleaner shown in Figure 12-9 is equipped with a control panel that contains a meter, operating controls, and water-wash controls.
The meter is used to check the performance of the electronic air cleaner (see Figure 12-23). The meter is divided into three sections. If the unit is operating properly, the indicator needle will be steady and remain in the center section (the normal operating range on the meter). Fluctuations of the needle outside the normal operating range indicate that the unit is not operating properly. The specific problem is determined by the position of the needle.
The system/blower controls are located to the right of the meter; the washer/cleaner controls to the left. The voltage-control knob operates in conjunction with the meter and is used to adjust the unit for line voltage variations. The basic procedure for operating the electronic air cleaner shown in Figure 12-9 is as follows:
1. Turn cleaner time switch to on position.
2. Push the off wash button.
3. Push the on cleaner button.
4. Push the cont blower button for continuous operation or the auto blower button for intermittent operation.
5. Push the on system button.
6. Adjust the voltage-control knob so that the needle remains in the normal operating range section on the meter.
Installation Instructions
When installing a built-in electronic air cleaner, make certain there is enough clearance to allow easy access to the filters and collector cells. These components must be cleaned periodically and should not be obstructed. Most manufacturers recommend at least 30 inches of clearance for servicing.
Pay particular attention to the airflow arrow printed on the side of the electronic cell. This arrow is used to indicate the correct direction of the airflow through the unit. If the electronic cell is installed so that the airflow arrow is facing the wrong direction, excessive arcing will occur and the unit will not operate efficiently.
The conventional air filter should be removed after the electronic air cleaner has been installed in order to help reduce pressure drop through the furnace.
Air volume adjustment is another factor that must be taken into consideration when installing one of these units. These adjustments should be made in accordance with the manufacturer’s instructions. They will involve determining the required temperature rise through the heat exchanger, making the necessary fan speed adjustments, and calibrating the filter flag setting (when used).
Some existing installations may require transitions or duct turns. If the ductwork makes an abrupt turn at the air cleaner, turning vanes should be installed in the duct to help provide an equal distribution of air across the entire surface of the filters. Do not install an atomizing humidifier upstream from an electronic air cleaner.