Trion 147207-001, Air Boss ATS manual Risk of Electric Shock, For the Maintenance Engineer

SECTION III OPERATION

WARNING

RISK OF ELECTRIC SHOCK

These servicing instructions are for use by qualified personnel only. To reduce the risk of electric shock, do not perform any servicing other than that contained in the operating instructions unless you are qualified to do so.

FOR THE MAINTENANCE ENGINEER

1. Description and Principles of Operation

The basic ATS units are made up of five modular sections. Each of the first three sections employs different mechanisms to remove and capture particulate matter from the air.

The first section, an impinger, is primarily designed for, and is especially effective in, capturing relatively large greasy liquid particulate. The impinger is constructed of two equally spaced layers of roll formed baffles. The spacing creates and air flow pattern which causes the contaminate to collect and flow down the baffles. Holes in the frame permit the liquid to drip into the drain basin below. Periodically, at a predetermined setting a remotely located control automatically activates oscillating wash manifolds located on both sides of the impinger to flush away any remaining tenacious matter. (Refer to the electronic air cleaner section below for additional description on the integral washer. It is identical to the impinger washer.)

The second section houses an electronic air cleaner, technically known as an electrostatic precipitator. In this type of equipment, all airborne particles, even of microscopic size, are electrically charged (positively) as they pass through a high voltage ionizer. These charged particles are then attracted and adhere to a series of parallel collecting plates, which form the negative elements of an electrostatic field.

The ionizer consists of charged stainless steel spiked blades spaced between grounded electrodes. The collecting section consists of parallel plates arranged so that each alternate plate is charged while the intermediate plates are electrically grounded.

The ionizing-collecting cells (contaminate collecting elements) are housed in the cabinet on slide rails. They can be removed from the cabinet as required, through the end access door, by sliding them out like drawers. On multicell units, all of the electrical connections between cells in a given tier are automatically made through spring connectors. On the access end, the high voltage from the power pack(s) is made with cables. When installing cells into the cabinet, observe the directional arrows on the cell end plates. The side of the cell containing the spiked ionizer blades always must be located on the air entering side.

The power supply(s) convert the 115-volt, 60Hz, single- phase AC supply to the high voltage DC needed to power the cell(s). The power supplies are solid state, pulse width modulated (PWM), line and load regulated. Potential output voltages of 12.5 KVDC are required for the ionizer and 6.25 KVDC for the collector at a maximum current of 6 MA. Each supply is retained in the control in slide channels and secured with one bolt located in the top corner of the circuit board.

At a predetermined frequency the remotely located control automatically activates an integral wash system to flush away the collected contaminant. When activated, the duration of the washing cycle is approximately 80 minutes.

The wash system consists of a series of spray nozzles soldered into oscillating water wash manifolds. The manifolds are located in the front and rear of each cell tier. They are mechanically interconnected with a drive- belt and driven through direct linkage by a fractional HP motor. A detergent feeder is also incorporated into the wash system. The amount of detergent needed for each wash is readily field adjustable and that amount is dependent upon wash water temperature, the type and amount of contaminant collected.

In addition to the preset automatic wash cycle, the washing operation may be initiated manually when required. The events in a wash cycle are:

A.Power pack(s) and system blower ”OFF”

B.Washer and detergent “ON” (each module)

C.Washer and detergent “OFF” (each module)

D.Pause for detergent to react

E.Washer “ON” for rinse (each module)

F.Washer “OFF” (each module)

G.Blower “ON” for forced dry

H.Power pack(s) “ON”

When a fire control system is specified, both the impinger and electronic air cleaner sections contain chemical spray nozzles.

The third section houses a bag filter(s). In the event of an electrical outage in the electronic air cleaner, the bag filter acts as a safety backup collector.

Also, in some applications, the bag filter will collect any precipitated agglomerates that may tend to “blow-off” the electronic air cleaner.

When the bags become saturated with contaminant they must be removed and replaced. However, this requirement is relatively infrequent due to the pre- filtration upstream from the bag.

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