2-44 888-2629-200 10/6/10WARNING: Disconnect primary power prior to servicing.Section 2 Installation Maxiva ULX COFDM Series2.11.5 Final Cooling System Fill! CAUTION:THE SYSTEM MUST BE TESTED FOR LEAKS AGAIN ONCE THE REQUIRED 50/50GLYCOL/WATER MIXTURE HAS FILLED THE ENTIRE SYSTEM. A GLYCOL/WATERMIXTURE WILL EXPOSE SMALL LEAKS WHICH ARE NOT EVIDENT WHEN TESTINGFOR LEAKS WITH PURE WATER OR AIR.STEP 1 Charge the cooling system with equal amounts of glycol and water(see section "B.1 Coolant and Water Recommendations" on page B-1).The amount of residual water in the system must be taken into accountwhen adding glycol and water to the system. The amount of residualwater (water that remains trapped in the system and can’t be readilyremoved by opening drain valves) and will vary from system to system.The amount of residual water can be estimated if the amount of initialfill water (recorded earlier) was tracked and compared to the amount ofre-fill water required during the flushing, this was also recorded earlier.If the amount of residual water is significant and is ignored theconcentration of coolant may be less than the specified 50/50 mixture.Extra glycol, equal to the amount of trapped water in the system, mustbe added in order to achieve the proper glycol water mixture.STEP 2 Run pumps for several minutes and open vent valves to remove allair from the system. Alternate pumps A and B.STEP 3 During the final system fill with the coolant/water mixture,frequently check the static pressure of the cooling system with thepumps deenergized. During pump operation the static pressure of thesystem will drop as the trapped air is bled from the system. With thepumps deenergized, the cooling system must be charged with coolantmixture to a pressure of 10 psig. This is accomplished by attaching asmall pump to a low point in the system or to the pump fill connection(see Figure 2-1 on page 2-16) on the pump module assembly andpumping in additional coolant mixture until the static pressure reaches10 psig.STEP 4 Recheck system for leaks.STEP 5 Repeat steps 1 through 4 until coolant level has stabilized.STEP 6 Check system sight tube to be sure that all air has been vented andthe system is full of coolant. Drain a sample of coolant from the systemand check the 50/50 mixture. Use a conventional float hydrometer andjar or a MISCO DFR 200 or equivalent digital refractometer to verify
