Additional thought, make sure if it is a glycol system, the power pack is large enough. With the 12 product trunkline you have 4 glycol lines. This makes the distance calculation go to 1 1/2 times the actual length for cooling purposes. I wouldn't feel cormfortable with the 75 ft power pack in this situation, 125 ft would be fine. Also I would have a second pump, one for each trunkline, for two reasons. The customer would be still able to use one tower if one of the pumps goes down. The other being, if you get caught without a backup pump, you could jump the trunklines and have the both towers back up and running till you could get a replacement.
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