16
If the water diffusers are not functioning properly, in most cases it is a sign that the suction strainer
has not been working properly and that foreign matter or dirt has accumulated in the water
distribution pipes. The nozzles can be cleared by taking a small pointed probe and moving it back
and forth in the diffuser opening, with the pump(s) running and the cooling load and fan(s) off.
If an extreme build up of dirt or foreign matter occurs, remove the end cap in each branch to flush
the debris from the header pipe. The spray branches and header can be removed for cleaning,
but should only be done if absolutely necessary.
After the water distribution system has been cleaned, the suction strainer should be checked
to make sure it is in good operating condition and positioned properly so that cavitation or air
entrapment does not occur.
When inspecting and cleaning the water distribution system, always check that the orientation
of the water diffusers is correct as shown below for LPT and LSTE models in Figure 13 and as
shown in Figure 14 for AT/UAT and PMTQ models. The top of the EVAPCO logo on the nozzle is
parallel with the top of the water distribution pipe.
Bleed-Off Valve
The bleed-off valve, whether factory or field installed, must be checked weekly to make
sure it is functioning and set properly. Keep the bleed-off valve wide open unless it has
been determined that it can be set partially open without causing scaling or corrosion
Figure 13 – LSTE / LPT Water Distribution
Figure 14 – AT / UAT / PMTQ Water Distribution
Summary of Contents for AT 110-112
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