Delta Cooling Towers, Inc.
Table of Contents Delta Cooling Towers Principle of Cooling Towers………………..……………. Cooling Tower Terms and Definitions…………………… Water Treatment……..………………………….……….. 2 2 3 General Information Safety………………..………………………………….… Approximate Weights………………..…………………… Dimensions & Other Physical Data……..………...……… 3 4 4 Handling & Installation On-Site Inspection………………..………..…….….……. Off Loading……..……………..………………………….. Anchoring……..……….…………………………..……… Electrical Wiring of Fan Motor & Accessories……..……..
Delta Cooling Towers Principle of Cooling Towers All Cooling Towers operate on the principle of removing heat from water by evaporating a small portion of the water that is recirculated through the unit. The heat that is removed is called the latent heat of vaporization. Each one pound of water that is evaporated removes approximately 1,000 BTU's in the form of latent heat.
Water Treatment • • • • • The Delta Cooling Towers are manufactured from corrosion-resistant plastics which are resistant to water treatment chemicals including common fungicides and bactericides. Follow appropriate water treatment practices as required and take frequent sample tests to avoid possible water contamination. We also recommend water treatment maintenance as a measure of protection of the environment in the vicinity of any cooling tower or other equipment open to atmosphere.
Approximate Weights The TM Series cooling towers are manufactured in three basic sections; a polyethylene tower body, a polyethylene sump, and a fan assembly section. The tower body ships with the fan assemblies installed. The tower sump ships as a separate piece. Overall Dimensions (inches) Approximate Weights (lbs.
Handling and Installation of Your TM Series Cooling Tower On -Site Inspection Upon arrival at the job site, carefully inspect the shipment for any damage. If shipping damage has occurred, notify the driver or the carrier immediately and make a notation of the damage on the shipping bill of lading. Check that all items listed B/L have been received. Offloading The TM Series cooling towers are normally delivered to the site on a 30 inch high drop deck trailer.
Store tower assembly as shipped until the time of installation, in a secure, level and debris free location at the job site. CAUTION: For extended lifts, use duplicate rigging, fabric slings around body as shown, as an additional safety precaution. Installing The cooling tower should be assembled in place on the previously prepared foundation. • • After re-checking the rigging, lift the sump section of each cell and secure properly to the foundation.
• • The body section should then be lifted and carefully position to align the support post of the sump with the corresponding groove of the tower body. Note that the four corner posts are slightly higher than other post to ease installation alignment. Set one end of the tower body onto the corner post at one end of the sump first. This can be accomplished by use of a rope tether attached to the lifting bar at one end of the housing.
On multi cell towers, install PVC water redirector panels between each sump using self-tapping screws provided (See sketch below). Start with screwing the PVC post from the bottom up. Next apply a heavy bead of RTV sealant on the end of each redirector panel. Start screwing the redirector panels from the end nearest the post toward the center. Do not screw overlapping panels to allow for expansion and contraction. • (Side View of Redirector Panels) Multi Cell Water Redirectors.
Electrical Wiring of Fan Motor and Accessories • • • • • • • • • Installation of a vibration cut-out switch is recommended. (Refer to tower accessories available). All electrical work should be performed only by qualified personnel and in accordance to prevailing electrical codes, practices and safety standards. The motor starter should be sized on voltage, nominal horsepower, and maximum full load current. This current value can be found on the motor nameplate.
PVC Solvent Cementing Instructions The following procedure is recommended for the preparation and cementing of internal and external piping for Delta Cooling Towers: • Cut ends of pipe square using a handsaw and miter box. Tube cutters with wheels designed for use with PVC are acceptable, providing they do not leave a raised bead on the outside diameter of the pipe. • Use a chamfering tool or file to put a 10° to 15° chamfer on the end of the pipe. Lightly sand the area to be cemented to remove gloss.
Operation and Maintenance of Your TM Series Cooling Tower Safety in Operation of the Fan NEVER operate the fan when the access panel or the entire fan guard is removed. NEVER remove access manhole cover while fan is in operation. NEVER operate fan when any work, access, maintenance, trouble-shooting, etc. is being performed on the inside of the fan ring assembly or inside the tower plenum. • • Normally, electrical codes dictate a disconnect box at the cooling tower.
• The maximum operating inlet water temperature should not exceed 140° F. CAUTION: When stepping on top of the fill, distribute the body weight by means of two plywood plates as described earlier in these instructions. Fan and Mechanical Drive System and Its Maintenance Safety Follow all safety instructions previously discussed. Motor: • • • The standard motor is a totally enclosed motor , Class F insulation, 1.
• • • • Check spray pattern from nozzles to be sure there is no clogging. Remove drift eliminators for nozzle inspection, then return to proper position. Start up fan motor and check amperage and voltage against motor nameplate data. The standard make-up valve assembly is shipped with the plastic float ball strapped against the tower side to prevent damage.
Cold Weather Operation Cold Weather Protection The cooling tower may require protection against freezing at light heat loads when the wet-bulb temperature is under 32°F., or during shutdown when the temperature drops below 32°F. The following methods are recommended for use in Delta Cooling towers for protection during cold weather conditions. Recommended equipment is optional and may be ordered from the factory.
PVC Distribution System To prevent damage to the PVC distribution system during cold weather shut-down, install an automatic or manual drain line from the hot water inlet piping as close to the cooling tower inlet as possible. The entire inlet and distribution system must be drained for shut-down in subfreezing weather. Piping When the cooling tower is located outdoors, adequate measures including the use of heating tapes and insulation should be considered to protect water lines from freezing.
Trouble-Shooting Guide For TM Series Induced Draft Cooling Towers Problem Increase in the leaving water temperature Possible Causes Corrective Actions 1. 2. Excess water flow; over pumping. Recirculation of hot discharge air, back into the cooling tower air intakes. Obstructed air intakes 1. 2. Adjust to the design flow. Eliminate obstructions which impede air discharge. For proper location of cooling tower(s), see Delta dwgs. Baffle air discharge, if necessary. 3.
Problem Excessively high water level in tower basin on closed loop system installations Uneven water level in tower basins of multicell installations Excessive water carry over (drift) Possible Causes Corrective Actions 2. 3. 2. 3. 4. 5. 6. 7. 1. 2. 3. Airlock. Unnecessary obstruction of waterflow (i.e., partially closed valve). Undersized piping. Horizontal pipe run too long. Improper hydraulic pipe design. Outlet vortex breaker provided. Make-up valve float set too high.
Motor Trouble Shooting Guide (General) Problem Possible Causes Corrective Actions High current draw (all 3 phases) 1. 1. Consult power company. 2. 3. 4. 5. 1. 2. 1. Change to 230V motor. Change to 200V or 280V motor. Consult factory. Reduce pitch / consult factory Consult factory Increase pitch / consult factory Consult power company and/or electrician. 2. 1. 2. 3. Replace motor. Consult power company. Increase line sizes. Check motor leads and other connections.
TM Series Optional Accessories TM Series Optional Accessories Available Aluminum Ladder(s) with a step platform and railing at the fan elevation custom designed for the cooling tower. Safety cage(s). Two speed motor(s) designed for cooling tower duty to the exclusive specifications of Delta Cooling Towers. Vibration cut-out switch provides for fan motor circuit disconnect for shutdown protection should abnormal fan vibration develop during service.
Preventative Maintenance Checklist Procedure Monthly Inspect General Condition of cooling tower. ¨ Check Water Level in cold water basin. Adjust if needed. ¨ Check float ball & Make-up Valve for proper operation. ¨ Check Line Voltage, Motor Amperage, Water Pressure. ¨ Clean Sump Strainers, if installed. ¨ Lubricate Motor Bearing, (if motor has fittings for greasing. The majority of motors require no external greasing). Use Proper Lubricants.
