Delta TM Series Cooling Tower manual Tower Model # Operating level from, Water Level in Tower Sump

•Check spray pattern from nozzles to be sure there is no clogging. Remove drift eliminators for nozzle inspection, then return to proper position.

•Start up fan motor and check amperage and voltage against motor nameplate data.

•The standard make-up valve assembly is shipped with the plastic float ball strapped against the tower side to prevent damage. To set the ball for proper operation, loosen the screw in the fulcrum arm, lift or depress the arm with the plunger pressed against the valve seat and tighten. Repeat until the proper operating level is obtained (Refer to operating level table below). It is recommended that a shut-off valve be installed in the make-up line.

•After 24 hours of operation:

Check spray nozzles for clogging.

Check tower sump water level.

Water Level in Tower Sump

•When the cooling tower is being operated with pump-suction, the make-up valve assembly with float ball should be adjusted to set the water operating level as follows:

Tower Model #	Operating level (from
	bottom of sump)
All Towers	10 inches

•Access the make-up valve through the window louver marked “Access Panel”.

•A lower water level than recommended may cause air to be drawn into the tower outlet piping and cause pump "cavitation."

•A water level higher than recommended will cause continuous overflow and waste of water as a result of potential “pull-down” from the piping when the system is shut down.

•The overflow should NEVER be capped, or its elevation altered by raising external piping.

Note: On gravity drain cooling tower(s), make-up assembly, overflow, drain and vortex breaker are not provided.

Revised 1-8-2007 13