valutazioni - 3, GPA: 4.7 ( )

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If there are deposits, the bleed-off rate needs to be increased. Some areas of the country have water with greater amounts of dissolved minerals requiring a higher bleed-off rate. Unit Size Media Pad Top Area HRE-20 1.5 ft2 HRE-45 2 ft2 HRE-55 2.5 ft2 HRE-90 3.3 ft2 8. Verify that both airflow and system static pressure are in agreement with the specifications. If these conditions are met, check for water carry over from the discharge side of the media. If carry over is observed, check the distribution header for Roof Curb Roof Line Manual Shutoff Evaporative Cooling Media Manual Shutoff Valve Supply Line Sump holes or tears and the water standoff tube for blockage. 9. After all final adjustments are made, remove the jumper wires and replace all access panels. The unit is now ready for operation. WATER CONTROL OPTIONS FOR EVAPORATIVE COOLING Auto Drain and Fill with Freeze Protection This system will automatically drain the sump tank and fill it with fresh water at the field adjustable intervals, typically once every 24 hours. This flushes mineral build-up and debris from the tank to promote low maintenance and increase media pad life. In addition, the system will protect the evaporative cooler from freezing by draining the sump tank and supply line when the outside temperatures fall below the set point of the outside air sensor. Typically, this is set at 45. to 50. F. The auto drain and fill control box should be installed in an area that is shaded from direct sunlight so the outside air sensor probe will detect an accurate air temperature. Plumbing (see FIGURE 9) 1. Run water supply line to the unit and install Water Supply Solenoid Valve (A) in this line as close to the water source as possible. 2. Install Drain Solenoid Valve (B) in the supply line as indicated below. From the outlet on the drain valve, run line to a suitable drain location. 3. Run an unobstructed drain line from the sump overflow to the drain as shown below. 4. Install Sump Drain Solenoid Valve (C) in the drain line from the sump as indicated below. From the outlet on this drain valve, run a line to a suitable drain location. Note: Water Supply Solenoid Valve (A) is not the same as the Drain Solenoid valves (B) and (C). Make sure to use the proper valve for each location. Check your local code requirements for proper installation of this type of system. Additional drain and supply plumbing may be needed to meet your local code. Caution: All solenoid valves A, B, and C must be installed below the roof to protect the supply water line from freezing. If these valves cannot be installed below the roof, an alternate method must be used to protect these lines from freezing. Sump Drain Pipe Sump Overflow Pipe Side of HRE Unit Roof Curb Roof Line Trap Evaporative Cooling Media Water Supply Solenoid Valve (A) Supply Line Sump Drain Solenoid Valve (B) Sump Drain Solenoid Valve (C) Drain Line TROUBLE SHOOTING FOR EVAPORATIVE MODULE Symptom Solution Insufficient water volume or recirculation pump not operating A. Check water level in base pan. The level should be at 2 inches. B. Check the pump filter at the inlet. Clean the filter if clogged or dirty. C. If pump is not operating, check wiring for loose connections and proper voltage. Irregular water distribution on cooling media Water distribution header, orifices or media partially blocked or plugged. Remove evaporative cooler from unit. Disassemble and clean distribution header, orifices and media. Scale and mineral A. Check water flow across the face of the media. Irregular water distribution deposit formation on face of media must be corrected (see above) B. Increase water flow rate. Media is self cleaning with flow rate of 11.2 to 2 gpm per square foot of media top area. Generally this flow rate prevents dissolved solvents from collecting on the media. To prevent further trouble, flush and clean the system more frequently. C. If this condition persists, chemicals may need to be added. Water pH should be maintained between 6 and 8. Water Carry-Over A. Irregular water distribution on face of media (see above). B. Average face velocity exceeds 650 fpm. Decrease fan rpm and airflow. C. Localized face velocities exceeding 650 fpm. Air filters or media face area is partially blocked. Clean or replace air filters and media. D. Check the overflow for blockage. Inadequate cooling A. Irregular water distribution over face of media (see above). B. Check for uniform air flow. C. Check outside wet-bulb temperature. High wet-bulb temperatures can decrease performance. D. Check water flow rate over media. Flow rate should be 11.2 to 2 gpm per square foot of media top area. Excessive water discharge into drain A. Check the water bleed off rate and make sure that it is not excessive. B. Check water level in base pan. The level should be at 2 inches. Poor performance after Pad installed backwards. To get the cooling pad performance from the cooling pads, replacement Leaving AirEntering Air 45°they must be inst...

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