Carrier 29D User Manual download pdf

Carrier

Operating and Maintenance

Instructions

29D

Automatic Water Strainer

Fig. 1 - Typical Automatic Water Strainer Installation

UNIT DESCRIPTION

The 29D Automatic Water Strainer cleans

foreign matter from the return water of a

Rotaspray® system. Figure 1 shows a typical

installation.

OPERATING CYCLE

Water enters the open end of the strainer drum

and passes outward thru the perforated skin. For

eign matter is screened out of the water, and

covers the inside surface of the drum causing the

water level to rise on the dirty side of the tank.

The water level on the clean side rises until it

reaches the height of the high side electrode A

(Fig. 2). This sets the strainer into operation.

The drum begins to rotate and the drum flushing

sprays are turned on. The dirty portion of the

drum passes under the sprays, and foreign matter

is flushed from the drum into the sludge pan. The

pan flushing sprays wash the foreign matter from

the pan into a drain or a perforated collection

basket. (The water drains from this perforated

basket into a sump, and can be returned to the

dirty side of the tank by a small auxiliary pump.)

After the drum is cleaned of foreign matter, the

water levels equalize, and the strainer stops after

the timed operating cycle.

When the water falls below the low side elec

trode B level (Fig. 2) the strainer starts to pro

tect the pump suction when:

1. The "Rotaspray" units evaporate water, caus

ing the water level on the clean side to drop

without a corresponding rise in water level on

the dirty side.

2. Changes in the system water flow requirements

suddenly drop the water level in the clean side

of the tank.

3. The high side electrode fails to operate.

I Carrier Corporation 1967 Printed in U.S.A.

12-67 29D-1SO

1 2 3 4

Summary of Contents

Page 1 - Automatic Water Strainer

CarrierOperating and Maintenance Instructions29DAutomatic Water StrainerFig. 1 - Typical Automatic Water Strainer InstallationUNIT DESCRIPTIONThe 29D

Page 2 - CONTROL CIRCUIT

fII0-I-60CONTROL CIRCUITAutomatic Operation - The water strainer control circuit (Fig. 3) consists of a timer and level controller. T

Page 3

LUBRICATIONMain Shaft Bearing - Lubricate strainer main shaft bearing with waterproof grease see Table 1. This is a sleeve bearing a

Page 4

For replacement items use Carrier specified partsManufacturer reserves the right to change any product specifications without notice.Tab 13 29D-lSONe

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Carrier 29D User Manual

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Summary of Contents

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