Cornelius Chiller ("CH" Series) CH 250 User manual

CHILLERS
MODELS: CH250 AND CH251
Operator’s & Installation Manual
Release Date: April 19, 2004
Publication Number: 620914801
Revision Date: April 29, 2010
Revision: D
Visit the IMI Cornelius web site at www.cornelius.com for all your Literature needs.

CH SERIES CHILLER
OPERATOR’S & INSTALLATION MANUAL
The products, technical information and instructions contained in this manual are subject
to change without notice. These instructions are not intended to cover all details or varia-
tions of the equipment, nor to provide for every possible contingency in the installation,
operation or maintenance of this equipment. This manual assumes that the person(s)
working on the equipment have been trained and are skilled in working with electrical,
plumbing, pneumatic and mechanical equipment. It is assumed that appropriate safety
precautions are taken and that all local safety and construction requirements are being
met, in addition to the information contained in this manual.
To inquire about current revisions of this and other documentation or for assistance with
any Cornelius product contact:
www.cornelius.com
1-800-551-4423
This document contains proprietary information and it may not be
reproduced in any way without permission from Cornelius.
Printed in U.S.A.
Copyright © 1999-2010, All Rights Reserved, IMI Cornelius Inc.

General Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Unpacking and Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Design Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Data Plate Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Chiller Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Location of Chiller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Process Water Flow, Units and Pump and Tank (Standard) . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Standard Thermostat Eliwell IC902 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Chiller Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Pump Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Circulation System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Fluid Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

CH Series Chiller Operator’s & Installation Manual
© 1999-2010, IMI Cornelius Inc. - 1 - Publication Number: 620914801
GENERAL INFORMATION
INTRODUCTION
The Cornelius “CH” Series Recirculating Water Chiller is designed to provide an accurate, reliable and user--
friendly system for cooling a continuous flow of water and keep it at a constant temperature in various closed loop
or tank cooling applications.
The “CH” Series Chiller consists of an air--cooled refrigeration system housed in a sturdy sheet metal frame and
cabinet. A standard pump and insulated water reservoir package provides a complete liquid cooling and
circulating system.
The “CH” Series Chiller is designed to operate in a clean laboratory or industrial environment where ambient
temperatures range from 40 to100° F (5 to 38° C). With proper installation, operation and maintenance, the “CH”
Series Chiller will provide years of trouble free service.
UNPACKING AND INSPECTION
This unit was thoroughly inspected before leaving the factory and the carrier has accepted and signed for it. Any
damage or irregularities should be noted at the time of delivery and immediately reported to the carrier. Request
a written inspection report from the Claims Inspector to substantiate any necessary claims. In the event that an
immediate replacement is necessary, please contact Cornelius Chiller Sales at 1-800-551-4423.
DESIGN DATA
The voltage and the frequency are indicated on the serial number plate, located behind the drip tray and on the
right hand side near the controls.
DATA PLATE INFORMATION
CH250 CH251
Cooling Capacity:
BTU/hr (W) at 80° F (27° C) and 70°
F (21° C) Liquid Temperature 3,000 (879) 3,000 (879)
Compressor Horsepower .25 (.2 kW) .25 (.2 kW)
Electrical Data:
Voltage/Phase/Hertz/Amperage 115/1/60 7.5 Amps 230/1/60 3.8 Amps
Refrigerant Type R134a R134a
Physical Dimensions, Width X Depth
X Height 17.125” X 14.125” X 13.375” (43.5 cm X 35.9 cm X 34 cm) 17.125” X 14.125” X 13.375” (43.5 cm X 35.9 cm X 34 cm)
Fittings:
Process Connections 1/2” FPT (S/S) 1/2” FPT (S/S)
Optimum Process Liquid Flow GPM
(Liters/Min) 0.6 (2.72) 0.6 (2.72)
Condenser Air Flow (CFM) 225 225

CH Series Chiller Operator’s & Installation Manual
Publication Number: 620914801 - 2 - © 1999-2010, IMI Cornelius Inc.
Figure 1. Sample Data Plate
When servicing a Cornelius Chiller, it is important to note the information contained on the data plate located in
the upper rear of the Unit.
If technical assistance is needed, the phone technician will need the Serial Number of your chiller. That information
is found on the Data Plate along with the model number, voltage requirement and refrigerant information.
The serial Number is also needed when replacement parts are being ordered or for warranty claims. See CHILLER
WARRANTY PAGE.
NOTE: Be sure to include the serial number on any documentation or billing information.
CHILLER INSTALLATION
Location of Chiller
THE CHILLER MUST BE LOCATED NEAR A PROPERLY GROUNDED ELECTRICAL OUTLET. THE CIRCUIT
SHOULD BE FUSED AND NO OTHER ELECTRICAL APPLIANCE SHOULD BE CONNECTED TO THE
CIRCUIT. ALL ELECTRICAL WIRING MUST CONFORM TO NATIONAL AND LOCAL ELECTRICAL CODES.
The chiller must be located in a well ventilated, indoor area where ambient temperatures will remain above 40° F
(5° C) and will never increase above 100° F (38° C). To obtain optimum cooling capacity, the ambient
temperature should be at or below 80° F (27° C).
It is very important that the air intake and discharge sides of the chiller are not obstructed by other free standing
objects. A minimum of two feet of space on all four sides of the chiller will be sufficient to prevent air flow obstructions.
It is also important to direct any hot air discharge from other equipment away from the air intake side of the chiller.
Condenser air entering the “CH” unit should be below 100° F (38° C).Condenser air temperatures above 100° F
(38° C) can cause the high pressure safety control to shut down the unit.
Electrical Connections
All wiring must conform to the National Electric Code and any applicable local codes. The chiller must be
permanently wired by means of electrical conduit to a properly fused disconnect of proper amperage or wired to a
properly rated power cord and plugged into an outlet with the appropriate disconnect and amperage rating. The
electrical junction box, located on the back panel of the chiller, includes a four terminal strip for power supply
connection. Refer to Figure 2 for the CH250 model and Figure 3 for the CH251 model.
Figure 2. Wiring Diagram (115V)

CH Series Chiller Operator’s & Installation Manual
© 1999-2010, IMI Cornelius Inc. - 3 - Publication Number: 620914801
Figure 3. Wiring Diagram (230V)
The data plate, located next to the junction box, includes the actual voltage, phase and amperage of the chiller.
START UP
Process Water Flow, Units and Pump and Tank (Standard)
Follow standard plumbing practices and local codes in making water connections. The chiller inlet and outlet
connections are 1/2”. Flexible hose and fittings are recommended for plumbing the system. A No. 20 mesh strainer
should be installed on the chiller inlet to prevent foreign particles from entering the system and should be cleaned
monthly. Lines should be routed with as few bends as possible. Prevent lines from running near radiators, hot water
pipes, etc. Any lengths of tubing that are exposed to high ambient temperatures should be insulated to prevent
condensation and/or significant liquid heat loss.
After ensuring that the system is free from the obstruction, that all valves are open and the reservoir when
available is full, push the CONTROL POWER switch to the “ON” position. The pump should now be operating.
STANDARD THERMOSTAT ELIWELL IC902
The following procedure should be followed to adjust the Eliwell IC902 thermostat temperature setting:
1. To set the SET POINT, press and release the SET button. SET displays.
2. Press the SET button again, the current SET POINT is displayed. Press the UP or DOWN button to
change the SET POINT to the desired temperature.
3. Press the fnc button twice to exit the program. The current liquid temperature is displayed.
The thermostat has a range that is pre-set at the factory. The range is 40° F (5° C) to 100° F (38° C). If operation
outside of this range is required, please contact the Cornelius Technical Service Department.
WARNING: Never operate the chiller with it’s panels removed.
Always use the power switch to turn off the chiller when it is not being used.
Always ensure that all air inlets and outlets are free from obstruction.
Be sure that the reservoir is filled with fluid prior to powering up the unit (see Fluid Recommendations
page).

CH Series Chiller Operator’s & Installation Manual
Publication Number: 620914801 - 4 - © 1999-2010, IMI Cornelius Inc.
Figure 4. Control Panel
CHILLER MAINTENANCE
Condenser
On air-cooled chillers, the CONDENSER FINS should be cleaned by blowing compressed air through the
condenser from the fan side. Dirt and debris accumulate on the condenser fins over time and this build up can
severely reduce the performance of the chiller. Cleaning of the CONDENSER COIL FINS should be done
approximately every three months, depending upon cleanliness of your application.
Pump Motor
The PUMP MOTOR should be lubricated with thirty drops of SAE 20 oil once a year.
Circulation System
The CIRCULATION SYSTEM should be drained and flushed periodically to avoid build up and a possible flow
restriction caused by contaminants.
fnc
set
out1 oF
WARNING: 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.

CH Series Chiller Operator’s & Installation Manual
© 1999-2010, IMI Cornelius Inc. - 5 - Publication Number: 620914801
FLUID RECOMMENDATIONS
Cornelius chillers are designed to operate with water to provide maximum performance for temperatures of 40° F
(4.4° C) to 100° F (37.8° C).
For questions regarding special or other fluids contact IMI Cornelius at 800-551-4423.
To purchase Lab or Industrial Glycol contact:
IMI Cornelius, 1-800-551-4423 - Part No. 111521000, 5 Gal.
Distilled Water Acceptable
De-Ionized Water
(1-5 Meg ohms) Acceptable
De-Ionized Water
(5+ Meg ohms) Acceptable with Stainless Steel & PVC only (No Copper
or Brass)
Propylene Glycol
(Lab & Industrial Grade) Acceptable - 30% Glycol/70% Water (For Applications with Temperatures below 40° F)
Lab & Industrial Grade Ethylene Glycol Acceptable - 30% Glycol/70% Water
(For Applications with Temperatures below 40° F)
Mineral/Hydraulic Oils
(Commercial/Automotive Antifreeze)
NOT Acceptable
(Silicate Rust Inhibitors in Automotive/Commercial anti-
freeze damages pump seals and housing which lead to
failure.)
Acidic/Basic Solutions
(Above 8 or below 6 PH) Not Acceptable
Mineral/Hydraulic Oils
(Viscosity > 50 Centistrokes) Not Acceptable

CH Series Chiller Operator’s & Installation Manual
Publication Number: 620914801 - 6 - © 1999-2010, IMI Cornelius Inc.
TROUBLESHOOTING
Trouble Problem Cause Remedy
Chiller does not operate, Power
Light “OFF”
A. No Power to unit
B. Defective Control Power Switch
C. Defective Control Transformer
D. Wrong Voltage supplied to Unit
A. Check main disconnect fuses,
wiring and power lead to unit.
B. Replace Switch
C. Replace Transformer
D. Supplied Voltage MUST be
within +/- 10% of nameplate rat-
ing
Pump does not Operate but Power
Light is “ON”
A. Line to or from chiller is
restricted.
B. Internal or external filter is
blocked with debris.
C. Pump contactor is defective
D. Damaged pump motor or impel-
ler.
A. Inspect lines and remove any
obstructions.
B. Remove and clean strainer,
then replace.
C. Replace contactor
D. Replace pump motor or impel-
ler.
Unit runs continuously, but is not
cooling process water enough.
A. Condenser is restricted.
B. Unit low on refrigerant.
C. Inefficient compressor.
D. Unit is undersized for applica-
tion.
A. Clean condenser.
B. Call Service.
C. Call Service.
D. Call Cornelius Chiller Sales
Rep.
NOTE: When servicing a Cornelius chiller, it is important to note all information provided on the
DATA PLATE located on the upper rear of the unit. If technical assistance is needed, the Cornelius
Service Technician will need this information along with any description of the problem(s) you are
encountering. The serial no. and other information will also be required when ordering replacement
parts and any other Warranty Claims.
WARNING: 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.
If repairs to the chiller must be made, disconnect electrical power to the unit, then shut off
the water source.

CH Series Chiller Operator’s & Installation Manual
© 1999-2010, IMI Cornelius Inc. - 7 - Publication Number: 620914801
Figure 5. Cabinet Section Exploded View
Table 1. 115V Chiller
Item
No. Part No. Description
1 32386 Temperature Controller
2 31934 Power Switch
3 61014 Evaporator
4 620023502 Wrapper Panel
5 51882 Priming Reservoir Assy
6 24388 Panel, Left Side
7 60992 Compressor
8 31955 Pump
9 24390R Base Assy

Ice Frost Operator’s Manual
Publication Number: M620919596OPR - 8 - © 2004-2007, IMI Cornelius Inc.
WARRANTY
IMI Cornelius Inc. warrants that all equipment and parts are free from defects in material and workmanship under
normal use and service. For a copy of the warranty applicable to your Cornelius or Wilshire product, in your
country, please write, fax or telephone the IMI Cornelius office nearest you. Please provide the equipment model
number, serial number and the date of purchase.
10 31962 Fan Motor
11 31488 Fan Blade
12 620023503 Panel, Right Side
13 60576 Condenser
14 33082 Relay
15 32378 Transformer
16 32588 Temperature Probe
17 620023504 Panel, Front
18 24389 Shroud, Condenser
Table 2. 230V Chiller
Item
No. Part No. Description
1 32386 Temperature Controller
2 31935 Power Switch
3 61014 Evaporator
4 620023502 Wrapper Panel
5 51882 Priming Reservoir Assy
6 24388 Panel, Left Side
7 18361 Compressor
8 30730 Pump
9 24390R Base Assy
10 31487 Fan Motor
11 31488 Fan Blade
12 620023503 Panel, Right Side
13 60576 Condenser
14 33082 Relay
15 32378 Transformer
16 32588 Temperature Probe
17 620023504 Panel, Front
18 24389 Shroud, Condenser
Table 1. 115V Chiller
Item
No. Part No. Description

IMI Cornelius Inc.
www.cornelius.com