caron 2050 User manual

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Dear Valued Customer:
Thank you for purchasing CARON Products & Services equipment. We appreciate your
business and look forward to being your preferred supplier of controlled environment
equipment products in the future.
At CARON, we are committed to continuous quality improvement. Our goal is to supply our
customers with highly reliable equipment at a fair price. In order to openly monitor our
performance, we would appreciate your feedback on our products and services.
If you have questions, or any suggestions for improvement based on the installation or
operation of the equipment you have purchased, please contact our service
department at www.caronproducts.com or 740-373-6809.
Thanks again for your business!

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Revision Log
Version Date Description
J 06-02-14 Added condenser filter
K 08-02-17 Updated consistency between all manuals
L 02-02-18 Consolidated terminology

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TABLE OF CONTENTS
Warranty ........................................................................................................4
Equipment Overview.....................................................................................9
Installation...................................................................................................10
Unpacking
Choosing a Location
External Circulation
Selecting a Fluid
Connecting Electrical Power
Filling the Circulator
Emptying the Circulator
Operation.....................................................................................................12
Changing the Temperature Setpoint
Changing the Low Temperature Tracking Alarm Level
Changing the High Temperature Tracking Alarm Level
Calibration...................................................................................................15
Alarms..........................................................................................................16
Low Level Alarm
Temperature Tracking Alarms
Temperature Sensor Error
High Temperature Safety
Preventative Maintenance..........................................................................17
Specifications..............................................................................................18
Electrical Schematics.................................................................................19
Troubleshooting..........................................................................................20
Spare Replacement Parts...........................................................................21

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WARRANTY INFORMATION
EQUIPMENT LIMITED WARRANTY
Please review this section before requesting warranty service. At CARON, one of our primary goals is
to provide customers with high levels of personal service and top quality products, delivered on time,
backed by technical service and supported for the life of the product.
Before contacting us for warranty service, please be aware that there are repairs that are not
covered under warranty.
WARRANTY DEFINED
Caron Products & Services, Inc. (herein after CARON) hereby warrants that equipment manufactured
by CARON is free from defects in materials and workmanship when the equipment is used under
normal operating conditions in accordance with the instructions provided by CARON.
COVERED:
•Parts and labor for a period of one (1) year from date of shipment.
•Any part found defective will be either repaired or replaced at CARON's discretion, free of charge,
by CARON in Marietta, OH. Parts that are replaced will become the property of CARON.
•If CARON factory service personnel determine that the customer's unit requires further service
CARON may, at its sole discretion, provide a service technician to correct the problem, or require
the return of the equipment to the factory or authorized service depot.
•CARON will have the right to inspect the equipment and determine the repairs or replacement
parts necessary. The customer will be notified, within a reasonable time after inspection, of any
costs incurred that are not covered by this warranty prior to initiation of any such repairs.
NOT COVERED:
•Calibration of control parameters.
•Improper installation; including electrical service, gas and water supply tubing, gas supplies, room
ventilation, unit leveling, facility structural inadequacies or ambient conditions that are out of
specification.
•Cost of express shipment of equipment or parts.
•Any customer modifications of this equipment, or any repairs undertaken without the prior written
consent of CARON, will render this limited warranty void.
•CARON is not responsible for consequential, incidental or special damages; whether shipping
damage or damages that may occur during transfer to the customer’s point of use. When the
equipment is signed for at the customer’s site, ownership is transferred to the customer. Any
damage claims against the shipping company become the responsibility of the customer.
•Repairs necessary because of the equipment being used under other than normal operating
conditions or for other than its intended use.
•Repair due to the customer's failure to follow normal maintenance instructions.
•Parts considered consumable; including: light bulbs, filters, gases, etc.
•Damage from use of improper water quality.
•Damage from chemicals or cleaning agents detrimental to equipment materials.
•Force Majeure or Acts of God.

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This writing is a final and complete integration of the agreement between CARON and the customer.
CARON makes no other warranties, express or implied, of merchantability, fitness for a particular
purpose or otherwise, with respect to the goods sold under this agreement. This warranty cannot be
altered unless CARON agrees to an alteration in writing and expressly stated herein shall be
recognized to vary or modify this contract.
Ohio Law governs this warranty.

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EQUIPMENT INTERNATIONAL LIMITED WARRANTY
Please review this section before requesting warranty service. At CARON, one of our primary goals is
to provide customers with high levels of personal service and top quality products, delivered on time,
backed by technical service and supported for the life of the product.
Before contacting your distributor for warranty service, please be aware that there are repairs
that are not covered under warranty.
WARRANTY DEFINED
Caron Products & Services, Inc. (herein after CARON) hereby warrants that equipment manufactured
by CARON is free from defects in materials and workmanship when the equipment is used under
normal operating conditions in accordance with the instructions provided by CARON.
COVERED:
•Parts for a period of two (2) years from date of shipment.
•Any part found defective will be either repaired or replaced at CARON's or their authorized
representative’s discretion. Parts that are replaced will become the property of CARON.
•If CARON or their authorized representatives determine that the customer's unit requires further
service, CARON or the representative may, at its sole discretion, provide a service technician to
correct the problem, or require the return of the equipment to the an authorized service depot.
•CARON or their authorized representative will have the right to inspect the equipment and
determine the repairs or replacement parts necessary. The customer will be notified, within a
reasonable time after inspection, of any costs incurred that are not covered by this warranty prior
to initiation of any such repairs.
NOT COVERED:
•Calibration of control parameters.
•Improper installation; including electrical service, gas and water supply tubing, gas supplies, room
ventilation, unit leveling, facility structural inadequacies or ambient conditions that are out of
specification.
•Cost of express shipment of equipment or parts.
•Any customer modifications of this equipment, or any repairs undertaken without the prior written
consent of CARON, will render this limited warranty void.
•CARON and their representative are not responsible for consequential, incidental or special
damages; whether shipping damage or damages that may occur during transfer to the customer’s
point of use. When the equipment is signed for at the customer’s site, ownership is transferred to
the customer. Any damage claims against the shipping company become the responsibility of the
customer.
•Repairs necessary because of the equipment being used under other than normal operating
conditions or for other than its intended use.
•Repair due to the customer's failure to follow normal maintenance instructions.
•Parts considered consumable; including: light bulbs, filters, gases, etc.
•Damage from use of improper water quality.
•Damage from chemicals or cleaning agents detrimental to equipment materials.
•Force Majeure or Acts of God.

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This writing is a final and complete integration of the agreement between CARON and the customer.
CARON makes no other warranties, express or implied, of merchantability, fitness for a particular
purpose or otherwise, with respect to the goods sold under this agreement. This warranty cannot be
altered unless CARON agrees to an alteration in writing and expressly stated herein shall be
recognized to vary or modify this contract.
Ohio Law governs this warranty.
Caron Products & Services, Inc.
PO Box 715 ·Marietta, OH 45750
740-373-6809

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INTERNATIONAL SYMBOLS AND DEFINITIONS
WARNINGS
Warning of hazardous area
Warning of dangerous electric voltage
Earth (ground) protective
conductor
Local government may require proper disposal
Help
Information
i
?
Warning of hot surface

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EQUIPMENT OVERVIEW
Congratulations! You have just purchased the latest technology in constant
temperature circulators. Before using the equipment, familiarize yourself with key
components of the product and thoroughly read this manual.
Drain
Plug
Lift
Handle
Power
Switch
External
Circulation
Connections
Lid
Knob
Control
Panel

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Use tap or distilled water. Or deionized water with a
resistivity between 50KΩ-CM and 1MΩ-CM.
INSTALLATION
Unpacking
Your unit has been packaged to avoid shipping damage. However, the unit should be
fully inspected upon arrival before signing for receipt. If the package has visual
damage, notes should be made on the freight bill and signed by the delivery company.
In the event of concealed damage after the unit is uncrated, keep the carton and
packaging material. Call the shipping company within 7 days of receipt, request
inspection & retain a copy of the inspection report.
Choosing a Location
To ensure proper operation, the unit must be located on a firm level surface. The unit
should be located in an area where there is no direct airflow from heating and cooling
ducts and out of direct sunlight. Allow four inches of clearance on the top and back of
unit for airflow. DO NOT cover up the air vent holes. Verify proper electrical power is
available.
External Circulation
To use the external circulation, connect inlet and outlet quick-disconnect fittings to
circulator. Be sure external loop is sealed & able to withstand 10 psig. Insert the male
quick disconnects into the female quick disconnects. When quick disconnects are in
place and the unit on, the external circulation pump will function and pump liquid at the
OUTLET connection.
Selecting a Fluid
Water is recommended for applications requiring temperatures above 10ºC. Add 5 mL
of bleach or algaecide to circulator before starting. A solution of antifreeze (propylene
glycol) and water are recommended for temperatures below 10ºC. Follow the
directions on the antifreeze container for the proper mix.

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Do not operate circulator without sufficient liquid
in the reservoir or severe damage could occur.
Do not overflow circulator. Allow for addition of
product.
Connecting Electrical Power
The unit requires an electrical connection that must be properly grounded. The power
cord of this circulator is equipped with a grounded plug which mates with a standard
grounded wall outlet. Operate the unit using only the power cord that has been
supplied when purchased. Leakage current of this unit can exceed 3.5mA.
Electrical power required is:
2050-1 115V, 60Hz, 10A
2050-4 230V, 50/60Hz, 5A
Filling the circulator
Be sure the drain plug is properly installed before filling with fluid. Fill the circulator with
water, propylene glycol or other non-flammable appropriate thermal fluid. Circulator
should be filled approximately 0.5” from top or until the low liquid level alarm shuts off.
Additional fluid may be needed after the unit is turned on to compensate for external
tubing volume.
Operation of the unit in temperature ranges near or below 0ºC may cause the fluid to
attract water into the reservoir, especially in areas of high ambient humidity. Overtime,
this can cause the reservoir to overflow.
To prevent severe burns, keep all extremities away from the fluid in the reservoir tank
or any exterior surfaces around the tank.
Emptying the circulator
Before draining the circulator, be sure the unit is at room temperature. To empty the
circulator, remove the 1/8” MPT plug (unscrew by turning counter-clockwise) located on
the lower left side of the circulator.
Be sure fluid is at room temperature before draining.
Contact with hot fluid can cause severe burns

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OPERATION
External circulation begins immediately when power is turn on. With the circulator
properly installed and the appropriate utilities connected, the power switch on the left
side of the control bezel can be turned on. Within minutes, the temperature will begin
to approach setpoint.
The circulator keypad is designed to produce a simple, easy to understand user
interface that is intuitive and user friendly. With just a few presses of the keys, the
logic behind the user interface is very easy to learn and remember.
There are four basic keys to setup or change any parameter to be setup or changed.
Rotates through the menus
Saves any adjusted parameter
Adjusts a selected parameter
Up/Down

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Changing the Temperature Set-point
The circulator has an operating temperature range of -15.0°C to 90.0°C. The default is
20.0°C. To change the operating temperature setpoint:
1) Press the key from the main menu, “SP" is displayed briefly
2) Press the to increase / decrease temperature setpoint (hold for scroll)
3) Press the key to save the setpoint
4) Press the key four times to return to the main menu
The refrigeration control is automatic; the refrigeration system is on for temperatures
below 45ºC, off for temperatures above 45ºC. Please consult the factory for other
configurations.
Changing the Low Temperature Tracking Alarm Level
The low temperature tracking alarm level is the deviation from the temperature
setpoint, which will cause a low temperature alarm. The low temperature tracking alarm
level is adjustable from -0.1 to -10.0. The default is -5.0, which indicates -5.0ºC below
setpoint. To change the low temperature tracking alarm level:
1) Press the key twice from the main menu, “AL.L" is displayed briefly
2) Press the to increase / decrease alarm level (hold for scroll)
3) Press the key to save the alarm level
4) Press the key three times to return to the main menu
Changing the High Temperature Tracking Alarm Level
The high temperature tracking alarm level is the deviation from the temperature
setpoint, which will cause a high temperature alarm. The high temperature tracking
alarm level is adjustable from 0.1 to 10.0. The default is 5.0, which indicates 5.0ºC
above setpoint. To change the high temperature tracking alarm level:

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1) Press the key three times from the main menu, “AL.H" is displayed briefly
2) Press the to increase / decrease alarm level (hold for scroll)
3) Press the key to save the alarm level
4) Press the key twice to return to the main menu

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CALIBRATION
The temperature can be calibrated as necessary. CARON recommends an annual
calibration check. Place the reference instrument’s temperature sensor in the tank or
circulating loop at the desired control location. Before making a calibration adjustment,
allow the circulator to stabilize.
The calibration offset is adjustable from -10.0°C to 10.0°C. The default is 0.0°C. To
enter a calibration offset:
1) Press the key four times from the main menu, “cAL" is displayed briefly
2) Press the to increase / decrease the calibration offset (hold for scroll)
3) Press the key to save the calibration offset
4) Press the key once to return to the main menu
Temperature calibration example:
If the circulator temperature display reads 40.0°C and the calibrated independent
sensor shows 40.3°C, set the calibration offset to 0.3°C. If the calibrated independent
sensor shows 39.6°C, then the entered offset should be negative. In this example the
required offset would be -0.4°C.

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ALARM
Low Level Alarm
The circulator is equipped with an alarm system that alerts the operator of a low fluid
level condition. When more fluid is needed, an audible buzzer will sound and the red
low level light on the control panel will illuminate. While in alarm mode, the circulator
will not properly control fluid temperature. External circulation will continue.
Add fluid per instructions in INSTALLATION section. When the fluid returns to an
appropriate level, the alarm will turn off and control fluid temperature as set.
Temperature Tracking Alarms
Other than the low level alarm created by the float switch, the alarm system checks to
see if the current temperature is above or below the temperature tracking alarm levels
as configured in AL.L and AL.H. If an alarm conditions exists, the display cycles
between the current temperature and the alarm condition at 1 second intervals.
To avoid nuisance alarms on system power up or setpoint changes, the alarms are
disabled for two hours or until the actual temperature gets within the alarm high and
low levels.
Temperature Sensor Error
In the unlikely event that a faulty temperature sensor is detected, “SErr” will be
displayed. Both the heater and the refrigeration system will remain off in this condition.
High Temperature Safety
The high temperature safety shut-off switch is preset from the factory just above 90ºC.
In the unlikely situation that the fluid temperature would exceed the circulator rated
temperature of 90ºC; an independent temperature sensor will turn off the heater.
External circulation and cooling (if temperature setpoint is below 40ºC) will continue.
When the fluid temperature drops below 90ºC, the heater function is enabled.
Contact a service representative immediately to correct the problem. The circulator
should not be used until it is repaired.

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PREVENTATIVE MAINTENANCE
The CARON circulator has been robustly designed to minimize performance problems.
However, regular maintenance is very important for continuous trouble free operation.
Recommended Daily Maintenance Checks
•Check the Temperature display versus setpoints.
•Check for and correct any alarm condition.
Recommended Monthly Maintenance Checks
•Check condenser air intake filter on top of unit. If it is dirty, replace it with CARON
part number FLTR306. Washing the filter will result in poor performance.
Recommended Annual Maintenance Checks
•Disinfect all interior surfaces with a general purpose laboratory cleaning agent such
as Cole-Parmer #G-08796-00.
•Vacuum or blow out fan and internal components.
•Perform a temperature calibration
R-134a refrigerant
•This unit contains R-134a which is a fluorinated greenhouse gas covered by the
Kyoto Protocol (Regulation EC No 842/2006) with a GWP of 1,300. Quantity of R-
134a is less than 0.2 kg.
To prevent electrical shock, turn off and unplug the unit before performing any service
or maintenance work on the unit. Performing operations or maintenance on this unit
other than the ones described in this manual can cause hazard situations and should
only be performed by qualified service personnel.

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SPECIFICATIONS
MODEL 2050-1 2050-4
Temperature Range -15°C to 90°C
Temperature Control ± 0.1°C
Temperature Controller Digital display, PID control 1/16 DIN
Cooling Capacity @ 20C 300 Watts
External Pumping 6.5 LPM at 0’ head
Work Area Dimensions 6.0” W x 2.0” F-B x 6.5” D
External Dimensions 13.5” W x 13.5” F-B x 14.0” H
Heater 750 Watts
Safeties Over-temperature shutoff and low level alarm
Reservoir Capacity 1.4 gallons (5.3 liters)
Circulator Reservoir / Lid
Material Stainless steel
Cabinet Material Stainless steel & powder coated metal
Electrical 115, 60 Hz 10A 230V, 50/60 Hz, 5A
Shipping Weight 53 lbs. (24.0 kg)
Specifications are subject to change without notice.
230V 50/60 Hz unit is CE Marked

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ELECTRICAL SCHEMATICS