Carrier 29D User's Manual
Contents
1. Automatic Water Strainer SOLENOID VALVE SOLENOID R VALVE SPRAY WATER MAKEUP WATER FLUSHING NOZZL FROM SPRAY VENT LOCATION WATER PUMP PIPE QUICK FILL DISCHARGE VALVE STRAINER CITY WATER J O39 Cpe Os aE NR S DIRTY WATER 7 WASTE PIPE LINE TO DRAIN COLLECTION BASKET TO DRAIN VALVE SB SUMP PUMP BALANCING VALVE STRAINER MOTOR PRESSURE GAGE OPERATING OVERFLOW prum FLusHing PE ay SPRAY NOZZLES BAFFLE OPERATING WATER LEVEL SHUTOFF VALVE FLUSHING TO NOZZLE Ly Yo oRAIN LOCATION f TO SPRAY WATER PUMP SUCTION VORTEX BREAKER CLEAN SIDE GASKETS BOTH SIDES OF UNIT LEGEND EEE ROTATION E gt WATER FLOW 3 PIPING OPTIONAL 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 dirty2. OPTIONAL D HEIGHT OF MAKEUP ON ELECTRODE Fig 2 Water Levels CONTROL CIRCUIT Automatic Operation The water strainer con trol circuit Fig 3 consists of a timer and level controller The control circuit is wired thru an auxiliary contact on the recirculated or chilled water pump starter If the fused disconnect switch is closed the control circuit is activated when the pump starts The strainer is then controlled automatically by the high or low side electrode When either electrode is energized the control circuit is completed This starts the drive motor opens the spray water solenoid valve and trips the timer Normally as the strainer begins to operate the water levels begin to equalize de energizing the electrode However the timer contacts remain closed for the preset timed cycle to maintain strainer operation The length of the timed cycle can be adjusted to suit job requirements At the end of the timed cycle the timer contacts open This normally stops the drive motor and closes the spray water solenoid valve However if the tank water level is too low the low side electrode will maintain the makeup valve open for several minutes until the water level rises enough tode energize the low side electrode Manual Operation A momentary contact switch is provided to bypass the automatic tank level con troller and operate the water strainer for one timed cycle This switch permits operation of the strainer
3. portion of the drum passes under the sprays and foreign matter is flushed from the drum into the sludge pan The Carrier Corporation 1967 Printed in U S A 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 12 67 29D 1SO MAKEUP VALVE QUICK FILL VALVE OVERFLOW LEVEL ON SHUTDOWN 3 z BALANCING A PRESSURE VALVE GAGE COLLECTION BASKET DRAIN SUMP PUMP DRAIN LEVEL DIFFERENTIAL A HEIGHT OF HIGH SIDE ELECTRODE HEIGHT OF LOW SIDE ELECTRODE eae ala OTT t OPERATING AS OVERFLOW MAXIMUM WATER PIPE id Kp i MINIMUM LEVEL Ei CLEAN SIDE HEIGHT OF MAKEUP OFF ELECTRODE
4. when the water pump is shut down 110 I 60 2 er x 9 TEEI PUMP AUX 3 C2 Q TI T2 STRAINER MOTOR HIGH SIDE TRIP _ Lb MAKEUP OFF a MAKEUP ON e LOW SIDE TRIP m N NOTE For wiring the unit use the diagram that comes with the unit S2 Makeup Wtr Solenoid Valve TM Timer Motor MSI Strainer Motor Starter TR Timer Relay Coil PB Push Button Terminals on Components S1 Spray Wtr Solenoid Valve Terminals on Terminal Strip Fig 3 Elementary Control Circuit 3 Relay Coils DIRTY SIDE OPERATING WATER LEVEL FT CLEAN SIDE OPERATING WATER LEVEL trae ee mh LUBRICATION Main Shaft Bearing Lubricate strainer main shaft bearing with waterproof grease see Table 1 This is a sleeve bearing and does not contain a grease reservoir Determine frequency of lubrication from operating conditions Lubricate approximately every 500 hr or three months whichever is earlier Drive Chain Lubricate drive chain with water proof grease whenever main shaft bearings are lubricated See Table 1 Table 1 Drive Chain Grease Guide HUMBLE OIL CO TEXACO INC MOBIL OIL CO Nebula EP2 Nonvatex No 2 Mobiltex EP2 Gear Motor Change oil after first week of oper ating and 1000 hr or six months thereafter whichever is earlier See Table 2 NOTE Do not lubricate gear motor while unit is in operation v Table 2 Gear Case Oil AMB
5. IENT AIR TEMP F me Texaco Meropa 2 or Equal 25 60 Texaco Meropa 5 or Equal 50 110 125 150 140 Drum Rollers Lubricate every 500 hr or three months whichever is earlier use Texaco Regal AFB2 or equal Sludge Pan Bearing This bearing does not re quire lubrication CLEANING AND INSPECTION Frequency of tank cleaning is determined by operating conditions which may require draining and cleaning once each week Clean all foreign matter from strainer tank perforated collection baskets and control electrodes Each time tankis drained and cleaned check the following 1 Drive chain and sprockets for wear alignment and proper chain tension 2 Rubber seal on entering side of drum for tight ness Make certain rubber is not damaged Tab 13 For replacement items use Carrier specified parts Manufacturer reserves the right to change any product specifications without notice 29D 1SO New 12 67 Codes C and MF Catalog No 532 904
Download Pdf Manuals
Related Search