Thermo Scientific Neslab Merlin M 75, Manual

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2 - 4 Merlin
Chapter 2
Thermo Scientific
Chillers are equipped with two reservoir tank isolation valves. The valves are
used to isolate the tank from the fluid flow. The chillers are factory shipped
with the valves open.
Ensure the valves are open when circulating to a closed system. When
operating at low temperatures and circulating to a closed system, should
condensation appear on the reservoir, closing the upper valve
after initial start
up
will help eliminate it. Leave the valve open for initial start up so process
fluid flow through the reservoir can rapidly bleed air from the system. To
close the upper valve, open the reservoir access panel and turn the valve 90°.
System temperature changes with the isolation valves closed, and
while circulating to a closed system, can create a vacuum and/or high
pressure conditions.

Filling
Requirements
Reservoir Tank
Isolation Valves
Fill to here
Minimum fill level
10"
4¼"
Reservoir
Isolation Valves
Upper Left Side of Unit, Panel Removed
The polyethylene reservoir is translucent for easy fluid level monitoring.
Remove the reservoir access panel. Locate and remove the reservoir cap. Fill
the reservoir with clean cooling fluid.
Since the reservoir capacity may be small compared to your application, have
extra cooling fluid on hand to keep the system topped off when external
circulation is started.
CAUTION