Delta TM-105312, TM Series Cooling Tower manual Problem Possible Causes Corrective Actions

Trouble-Shooting Guide For TM Series

Induced Draft Cooling Towers

Problem	Possible Causes		Corrective Actions
Increase in the leaving water	1.	Excess water flow; over pumping.	1.	Adjust to the design flow.
temperature	2.	Recirculation of hot discharge air, back into	2.	Eliminate obstructions which impede air discharge.
		the cooling tower air intakes. Obstructed air		For proper location of cooling tower(s), see Delta
		intakes		dwgs. Baffle air discharge, if necessary.
	3.	Proximity of other heat source or discharge	3.	Remove source or relocate tower.
		of moist air.	4.	See water distribution system instructions.
	4.	Improper operation of spray system.
		A. Orifices clogged.		A. Flush spray nozzles, clean orifices, clean
		B. Actual water flow is lower than design		system, install outlet strainer.
		sprinkler rating.		B. Install properly rated spray nozzles or increase
				to design flow.
	5.	Clogged fill.	5.	Clean the fill.
	6.	Damaged fill.	6.	Replace the fill.
	7.	Additional heat load on system.	7.	Contact Delta for possible upgrade or addition of
				another cooling tower selected for additional load.
	8.	Wet-bulb temperature higher than design.	8.	None required if condition is temporary. Otherwise
				consult Factory for upgrade.
Drop in the water flow rate.	1.	Blockage of spray Nozzle orifices.	1.	Flush spray nozzle. Clean whole system. Install
Low water flow rate				outlet strainer.
	2.	Low water level in sump causing air to be	2.	Adjust float valves. Be sure the system is flooded
		drawn into pump and piping.		and balanced.
	3.	Improper selection of water circulating	3.	Replace with proper size pump designed for flow
		pump.		and head requirements. Check pump “Net positive
				suction head.”
	4.	Blockage of strainers.	4.	Backwash or clean.
	5.	Pump malfunction.	5.	Consult pump specialist.
Noise and vibration	1.	Loose bolts.	1.	Recheck and tighten all bolts to specified torque.
	2.	Mechanical interference of rotating parts.	2.	Inspect propeller for free rotation. Check propeller
				for mechanical interference. Adjust, repair or
				replace, as necessary.
	3.	Fan propeller damaged or out of balance.	3.	Replace components, as necessary and check
				balance. Install vibration cut-out switch.
	4.	Air intake at pump.	4.	Check basin water level and irregular piping design.
			5.	Match pump NPSH with system hydraulics.
	5.	Pump cavitation.	6.	Check and replace motor.
	6.	Damaged motor bearings.
Sudden or short term irregularities of	1.	Peculiarities of specific system and its	1.	Inspect system and review operation procedures.
cold water level in basin		operation.		Correct, as applicable valve settings, loss of water in
				system, fill system to flooded capacity.
Excessively high water level in sump on	1. Gravity flow restrictions due to insufficient		1.
gravity drain installation		head differential.	A. Outlet piping should terminate below sump tank
				water level.
			B. Increase discharge pipe size.
			C.	Increase head by mean other than A.

16