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Plumbing
Requirements
Before installing the unit to an instrument that previously used tap water as a
cooling fluid, flush the instrument several times to remove any rust or scale
that has built up. The manufacturer of the instrument should be able to
recommend a cleaning fluid for their equipment.
The plumbing connections are located on the rear of the unit and are
labelled COOLING WATER and RECIRCULATING WATER. The top fittings
are inlets and the bottom fittings are outlets. The COOLING WATER
connections are ¾ inch FPT. The RECIRCULATING WATER connections
are ½ inch MPT.
Connect the COOLING WATER connections to the cooling water supply.
Connect the RECIRCULATING WATER connections to the instrument being
cooled.
Flexible tubing, if used, should be of heavy wall or reinforced construction.
All tubing should be rated to withstand 80 psi at +35°C. Make sure all tubing
connections are securely clamped. Avoid running tubing near radiators, hot
water pipes, etc. If substantial lengths of tubing are necessary, insulation
may be required to prevent loss of cooling capacity.
Tubing and insulation are available from NESLAB. Contact our Sales Depart-
ment for more information (see Preface, After-sale Support).
It is important to keep the distance between the unit and the instrument being
cooled as short as possible, and to use the largest diameter tubing practical.
Tubing should be straight and without bends. If diameter reductions must be
made, they should be made at the inlet and outlet of the instrument being
cooled, not at the unit.
If substantial lengths of cooling lines are required, they should be pre-filled
with cooling fluid before connecting them to the unit.
Fluids
Refer to the Water Quality and Recommendations section.
The selected fluid must have a viscosity of 50 centistokes or less at the
lowest operating temperature.
Tap water is the recommended fluid for operation.
Never use flammable or corrosive fluids with this unit.
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