Pump Strainer - Thermo Scientific Merlin M75 Manual

Pump Strainer

CAUTION
Thermo Scientific
If debris is in the system, the strainer will prevent the material from being
drawn into the flow switch and the pump, damaging the pump vanes. A
clogged strainer will also cause increased discharge pump pressures.
After initial installation, the strainer may become clogged with debris and
scale. Therefore, the strainer must be cleaned after the first week of
installation. After this first cleaning, we recommend a monthly visual
inspection. After several months, the cleaning frequency will be established.
Before cleaning the strainer ensure the cooling fluid is at a safe
handling temperature. Disconnect the power cord from the power
source.

We also recommend draining the reservoir.
The strainer is behind the right-side panel.
NOTE A small amount of fluid will come out of the internal strainer
housing when the fitting is removed. Have a rag handy to put under the
housing before removing the fitting.
Remove the panel from the chiller. Use one wrench to support the filter
housing, and a second wrench to unscrew the ¾ inch fitting. Remove the
screen.
NOTE Some chillers with ¾ inch fittings also have a brass end cap, see
illustration below.

Brass Cap
(some chillers only)
Clean the screen by rinsing it with water. When the screen is clean, replace it
and the cap. Tighten the fitting and replace the panel. Refer to Section III for
instructions on replacing the cooling fluid.

Screen
Fitting
¾"
Right-side view
Chapter 4
Merlin 4 - 5