2-44 888-2629-200 10/6/10
WARNING: Disconnect primary power prior to servicing.
Section 2 Installation
Maxiva ULX COFDM Series
2.11.5 Final Cooling System Fill
!
CAUTION:
THE SYSTEM MUST BE TESTED FOR LEAKS AGAIN ONCE THE REQUIRED 50/50
GLYCOL/WATER MIXTURE HAS FILLED THE ENTIRE SYSTEM. A GLYCOL/WATER
MIXTURE WILL EXPOSE SMALL LEAKS WHICH ARE NOT EVIDENT WHEN TESTING
FOR 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 account
when adding glycol and water to the system. The amount of residual
water (water that remains trapped in the system and can’t be readily
removed by opening drain valves) and will vary from system to system.
The amount of residual water can be estimated if the amount of initial
fill water (recorded earlier) was tracked and compared to the amount of
re-fill water required during the flushing, this was also recorded earlier.
If the amount of residual water is significant and is ignored the
concentration of coolant may be less than the specified 50/50 mixture.
Extra glycol, equal to the amount of trapped water in the system, must
be added in order to achieve the proper glycol water mixture.
STEP 2 Run pumps for several minutes and open vent valves to remove all
air 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 the
pumps deenergized. During pump operation the static pressure of the
system will drop as the trapped air is bled from the system. With the
pumps deenergized, the cooling system must be charged with coolant
mixture to a pressure of 10 psig. This is accomplished by attaching a
small 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 and
pumping in additional coolant mixture until the static pressure reaches
10 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 and
the system is full of coolant. Drain a sample of coolant from the system
and check the 50/50 mixture. Use a conventional float hydrometer and
jar or a MISCO DFR 200 or equivalent digital refractometer to verify
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