External Piping
WARNING: All facility water connections must be made by a licensed plumber.
General Considerations
To maintain a safe workplace and avoid leaks, special care should be taken when choosing hoses and
connectors for the Chiller. It is the user’s responsibility to ensure that the tubing and fittings connected to the
Chiller are compatible with the fluid, temperature, and pressure being used.
• Pressure Ratings – Hoses should be able to withstand a minimum pressure of 250 psi (17.2 bar).
• Flexible Tubing – Avoid tubing that will expand and increase fluid volume when operating at the desired
pressure.
• Take care when selecting hoses and connections for the Chiller. All external piping, tubing, or hoses should
be run full size to limit the potential for external pressure drops. The use of quick-connect fittings is not
recommended, as they can cause substantial pressure drops.
• Where applicable, always use a back-up wrench when making piping connections to the Chiller.
• Hose Diameter – The fittings on the Chiller’s process fluid lines are female 1.5 in NPT. The facility water
fluid inlets and outlets on water-cooled models are female 0.75 inch NPT.
• Facility Water (water-cooled models only) – Should be clean and well maintained. Ideally, the facility water
should be tested monthly to ensure a pH level between 7.2 and 7.8. Add algaecide if algae growth is
present.
Process Fluid Connections
The Chiller has two internally threaded (1.5 inch ID NPT) fittings on the rear of the instrument housing for the
process water connections.
Connect the Chiller’s inlet and outlet to the external apparatus with hoses or pipes. The direction of the flow
through the system can be controlled by the way the connections are made. Fluid is drawn into the Chiller
through the “Inlet” connection; fluid is pumped out of the Chiller through the “Outlet” connection.
Facility Water Connections
WARNING: The incoming cooling water pressure should be 20 psi / 1.4 bar minimum and 40 psi / 2.8 bar
maximum.
Water-cooled Chillers have two internally threaded (0.75 inch ID NPT) on the rear of the instrument housing for
the facility water connections. The cooling water supply should be connected to the facility water inlet on the
Chiller. The facility water outlet on the Chiller should be connected to the appropriate return or drain, as
required.
The cooling water supply may be from city tap water or a cooling tower. The incoming water pressure should be
between 20 and 40 psi / 1.4 and 2.8 bar.
Reservoir Drain
A 0.75 inch NPT connection is provided at the bottom of the reservoir Sight Glass / Level Indicator for the
reservoir’s gravity drain. It should be piped to a drain or receptacle positioned below the bottom of the reservoir.
If a receptacle is used, be sure it is of sufficient volume to hold all the coolant in the reservoir, process, and
process lines.
Reservoir Fill / Vent
A 0.75 inch female NPT connection is provided at the top of the Reservoir Sight Glass / Level Indicator.
If desired, you may add coolant to the Chiller through this connection to maintain an adequate fluid level. It is
recommended that you fill the Reservoir initially via the fill port at the top of the Reservoir.
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