SPX Cooling Technologies Cooling Tower Marley MD - Manual (Page 13)

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If tower is equipped with a side or end suction connection, vent ac-
cumulated air from the top of the suction hood by removing one or
both tap screws provided at that location. Replace these tap screws
when venting is complete.
4. Completely open all hot water flow control valves. Start your pump(s)
and observe system operation. Since the water system external to the
tower will have been filled only to the level achieved in the cold water
basin, a certain amount of “pump-down” of the basin water level will
occur before water completes the circuit and begins to fall from the
fill. The amount of initial pump-down may be insufficient to cause the
float valve to open. However, you can check its operation by pressing
down on the operating lever to which the stem of the float valve is at-
tached.
Some trial and error adjustment of the float valve may be required to
balance the makeup water with tower operation. Ideally, the float valve
setting will be such that no water is wasted through the overflow at
pump shutdown. However, the water level after pump start-up must
be deep enough to assure positive pump suction.
6. Continue pump operation for about 15 minutes, after which it is rec-
ommended that the water system be drained, flushed, and refilled.
Note
Installation