Cornelius CH Series Manuel de l'opérateur télécharger pdf (Page 8)

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TEMPERATURE CONTROLLER OPERATION

(see Figure 4)

During normal operation, the process temperature will be displayed on the Controller. The following procedure

should be followed to adjust the Controller set point:

1. Push and hold the “

” button located at the bottom left corner of the Controller. The set point will be dis-

played.

2. While holding the “

” button, press

(“UP”)or “ DOWN” button to raise or lower the set point until

the desired value is displayed.

3. Release the “

” button. The display will again show the system liquid temperature. The set point can be

viewed at any time by pressing the “

” button.

The Controller set point range has been preset at the factory. The range is 40_ F(5_ C) to 100_ F(38_ C). If

operation outside this range is required, contact the Remcor Technical Services Department.

OPTIONAL EQUIPMENT

LX Mode

l--Is equipped with a low--level alarm and a high--temperature interlock as optional items.

EX Model

--Is equipped with a low--level alarm, high--temperature interlock, low--flow interlock, and RS232 com-

munications as optional items.

A detailed description of these options is as follows:

Low--Level Alarm

--A float switch located in the liquid reservoir will activate an audible alarm when the tank level

drops below a critical level. It is important to note that this alarm will not shut down the system. The alarm will

sound until the unit reservoir has been refilled to the full line on the sight glass.

High--Temperature Interlock

A second output on the temperature controller will sense the process liquid tem-

perature and energize a set of normally open terminals located inside the electrical junction box on the back of

the Chiller when the temperature exceeds a set limit above the set point. The high--temperature interlock is

preset at the Factory to activate at 25_ F (13.9_ C) above the process set point with a hysteresis of 3.6_ F(2.0_

C). If other values are required, please contact the Remcor Technical Services Department.

Low--Flow Interlock

--A flow switch located in the Chiller water plumbing will sense when the process liquid flow

has dropped below 0.5 gpm. The flow switch will energize a set of normally open terminals located in the electri-

cal junction box on back of the Chiller . The low flow condition will also shut down the compressor and pump coils

of the Chiller and illuminate the red fault indicator on the control panel. The Chiller will remain shut down and the

terminals open until full flow is restored to the Chiller.

NOTE: The interlock terminals should be connected to a load that is appropriate for the following:

1. High--Temperature Interlock uses a solid--state relay rated at 5 FLA, 30 LRA @ 240 VAC.

2. Low--Flow Interlock uses a mechanical relay rated at 6 FLA, 1/2 H.P. @ 277 VAC.

RS 232 Communications

Allows the Controller to be connected to a personal computer to monitor

and/or program the Controller from a remote location up to 50 feet (15 meters).

CHILLER MAINTENANCE

W ARNING: Disconnect electrical power to the Chiller to prevent personal injury before

attempting any internal maintenance. Only qualified personnel should service the internal

components or electrical wiring.

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Cornelius CH Series Manuel de l'opérateur Page 8

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