13
Remote I/O Port
This option allows you to use an external 12 VDC signal to turn the Chiller on and off. A 9-pin D-
connector is provided on the rear of the instrument enclosure for this connection.
3.4 Plumbing
Process Piping
The Chiller has two internally threaded (1/2 inch ID NPT) fittings on the rear of the instrument
housing for the process water connections. Two sets of adapters (1/2 inch ID and 5/8 inch ID) are
supplied with the unit for connecting these fittings to the process piping.
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 the largest pressure that they will
encounter. For “P” Series (positive displacement pump) and “T” Series (turbine pump)
Chillers, this is 100 psi (689 kPa).
• Flexible Tubing — Avoid tubing that will expand and take up fluid volume when operating at
the desired pressure.
• Hose Diameter — Process piping/hosing with a diameter smaller than ½ inch ID can be
used if desired. However, keep in mind that using smaller diameter hosing increases
pressure in the circulating system.
• Couplings and Clamps — The use of screw-tightened hose clamps is necessary on all
joints to insure good, tight connections. Quick connectors are not recommended as they
have the potential for restricting flow rate.
Reservoir Drain
• A ½ inch NPT connection is provided 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 water in the reservoir, process, and process
lines.
3.5 Closed System or Cooling Coil Setup
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.
NOTE: When Chillers with the standard magnetic drive centrifugal pump are connected to an
external apparatus with a built-in shutoff, an external bypass loop assembly (Cat. No. 510-147) may
be needed if operating below 20°C (68°F). This bypass assembly continues flow circulation to and
from the pump even though the main flow to the external apparatus has been blocked.
3.6 Open Bath System Setup
Connect the Chiller’s inlet and outlet to the external bath using tubing of the same diameter and
length. The same size fittings should also be used on both the inlet (suction) and outlet (pressure).
This helps ensure a balanced flow. A restricting valve or pinch clip should be installed in the outlet
tubing and adjusted to match the return (inlet) flow rate.
Cut the external end of the suction tube into a “V” shape so that the tube will not seal itself against
the wall of the external tank. Both the pressure and suction tubing should be securely fastened to
the external tank to prevent movement during use.
When using flexible tubing, the suction tubing must have a wall thickness that will not collapse under
vacuum, particularly when going around bends.
Fill the external bath (see Section 3. 7 below for suitable fluids). The bath fluid must be at a level at
least slightly above the opening of the inlet tubing.
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