Start-up, Space and Location Requirements

Start-up

1.Prestart:

Check for correct dry cooler fan rotation. This can be done by quickly jogging the fan contactor. Be sure that the fans run freely. The same check is recommended for pumps.

2.Filling and Purging the System

The system should be pressure tested before adding glycol. The system can be tested with air or water, however if the ambient temperature is at or below freezing the use of air is recommended. Test pressure should not exceed 60 PSIG.

a.Roof Mounted Fluid Cooler

To fill the system, pour the premixed water and glycol into the expansion tank. Fill the system until the expansion tank is half full, then purge the air from ALL vents. Operate the system for a minute, then purge ALL vents again, and add glycol as required. Repeat the purging of all vents after the first hour of operation and again after several hours of operation.

b.Ground Mounted Fluid Cooler

The fluid cooler may be lowest point in the system, consequently the premixed water and glycol will have to be pumped into the system. Close the shut off valve and open the two hose bibbs installed in the piping run on the leaving side of the pump, see piping diagram.

Connect a pump and hose to the hose bibb away from the pump and a hose to the hose bibb closest to the pump. Begin pumping the glycol mixture into the system at FULL PRESSURE. For the return hose you should close the hose bibb so that you get only a small flow of fluid or air. This is necessary so you will build a head of fluid which will force the air from the system. Once all the air is out you will have a steady flow of only fluid. At this joint you should close off the two hose bibbs and open the shut off valve. See Diagram 3.

3.Flow Adjustment Procedure:

Once the system is completely full of fluid, start the fluid circulating pump. To assure proper fluid flow, adjust the shut-off valve for required GPM by checking pump curve and observing gauge pressure, or by using an in-line flow meter.

4.Instruction Envelope:

Keep wiring diagrams, instructions, list of spare parts, in an envelope within easy reach of the installed dry cooler.

Diagram 3.

Space and Location Requirements

The most important consideration which must be taken into account when deciding upon the location of air-cooled equipment is the provision for a supply of ambient air to the condenser, and removal of heated air from the fluid cooler area. Where this essential requirement is not adhered to, it will result in higher head pressures, which cause poor operation and possible eventual failure of equipment. Units must not be located in the vicinity of steam, hot air or fume exhausts.

Another consideration which must be taken is that the unit should be mounted away from noise sensitive spaces and must have adequate support to avoid vibration and noise transmission into the building. Units should be mounted over corridors, utility areas, rest rooms and other auxiliary areas where high levels of sound are not an important factor. Sound and structural consultants should be retained for recommendations.