14
3.7 Startup
Process Coolant
Suitable Fluids
IMPORTANT: Only use fluids that will satisfy safety, health, and equipment compatibility
requirements. Caustic, corrosive, or flammable fluids must never be used.
The Chiller is designed to accommodate a variety of coolant fluids (water, glycol mixtures, etc). For
most applications above 20°C (68°F), distilled water is satisfactory. For operation at or below 20°C
(68°F), the Chiller must be protected with an antifreeze solution. Ethylene glycol (laboratory grade)
and water in a 50/50 mixture is satisfactory from +20° to -15°C (68° to 5°F). Select a fluid that is
compatible with the Chiller’s wetted parts (see Section 2.2).
WARNING: Do not use caustic, corrosive, or flammable fluids.
WARNING: Operation below 20°C (68°F) requires antifreeze in the
circulation fluid.
WARNING: FOR CHILLERS WITH MAGNETIC DRIVE PUMPS ONLY.
A low temperature fluid, such as a mixture of 50% ethylene or
propylene glycol / 50% water, or equivalent, must be used under all
operating conditions.
Filling the Reservoir
Remove the filler cap from the reservoir and, using a funnel, add fluid until it reaches the MAX line
on the reservoir’s fluid level gauge. When full, remove the funnel, but do not replace the cap at this
time.
Electrical Power
Plug the Chiller’s power cord into an appropriate electrical outlet (see Section 3.2).
Place the Circuit Breaker/Power Switch on the rear of the instrument enclosure in the “On” position.
Three decimal points will appear on the Temperature display; two decimal points will appear on the
pressure/flow rate display.
. .
. . .
Starting Process Fluid Flow
Press the Power Button on the front panel. The system startup sequence will begin and proceed as
follows:
The pump will turn on and fluid will begin circulating through the system. The set point
temperature will appear briefly on the Temperature display; after a few seconds, it will be
replaced by the actual fluid temperature. Fifteen to 20 seconds after power up, the compressor
will begin operating.
Check for leaks.
With the pump running, the reservoir’s fluid level will drop as the process and/or process cooling
lines fill with fluid. Add fluid as follows:
Closed Systems: Slowly add fluid to the reservoir until the liquid level remains stable.
Open Bath Systems: Adjust the restriction (pinch) valve until the liquid level in both
the bath and the reservoir remain stable. Add fluid as needed to bring liquid levels in
the bath and reservoir up to the desired level. Make sure the fluid level in the bath is
above the opening on the Chiller’s inlet hose.
Replace the reservoir cap.
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