IMI CORNELIUS REMCOR INC ꢀ 500 REGENCY DRIVE ꢀ GLENDALE HEIGHTS, IL 60139–2268
Telephone (800) 551–4423 Facsimile (800) 519–4423
Operator’s Manual
CHILLER (“CH” SERIES)
Models: CH750, CH751, and CH951
Part No. 91256
Revision Date: August 9, 2002
Revision: C
THIS DOCUMENT CONTAINS IMPORTANT INFORMATION
This Manual must be read and understood before installing or operating this equipment
PRINTED IN U.S.A
IMI CORNELIUS INC; 2002
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INTRODUCTION
The REMCOR “CH” Series Water Chillers (Models CH750–A, CH751–A, and CH951–A) are specifically de-
signed to cool clean liquid before it is circulated to the cooling application. The Unit includes a complete refrig-
eration system and associated controls housed in a sturdy sheet metal enclosure with perforated panels for air
circulation. Options include a reservoir and a choice of pumps and temperature controls to provide a self–con-
tained liquid cooling/circulation system tailored to a particular closed loop or tank cooling application.
On closed loop systems, the Unit is provided with a pump and reservoir for recirculation of water from the chiller
to the process. On tank cooling systems, the Unit is provided without the reservoir and the pump is optional for
recirculation of water from the chiller to the tank. Control temperature is sensed on the outlet of the chiller for
closed loop systems and it is sensed on the inlet of the chiller for tank cooling systems.
The temperature control options consist of a general purpose digital thermostat and an electronic differential
thermostat to satisfy the temperature control requirements. Both options include a digital thermometer for moni-
toring system temperature.
The pump options consist of a small magnetic drive pump as standard with a variety of magnetic drive and posi-
tive displacement pumps available for particular flow and pressure requirements. An optional bypass valve is
available for the pump circulation system. (This valve is standard on Units utilizing the positive displacement
pumps). This can be used to adjust pump flow and pressure to match process requirements. This valve also
allows internal recirculation within the chiller in the event the chiller outlet is obstructed.
SPECIFICATIONS
CH750–A
CH751–A
CH951–A
Condensing Unit Horse Power
Electrical (Volts/Phase/Hz)
F.L.A. (Amps)
3/4
3/4
1
115/1/60
230/1/60
230/1/60
17
5
8.5
10
5
Reservoir Capacity (Gal)
5
Refrigerant 134–A Charge (Lbs) 3.5
3.5
4.0
Stainless Steel Connections
3/4–inch FPT
3/4–inch FPT
40°F-100°F
3/4–inch FPT
40°F-100°F
Operating Water Temperature
Range
40°F-100°F
Net Weight (Lbs)
175
175
175
Dimensions Depth (inches)
Width (inches)
24–1/2
18–1/8
30–1/2
24–1/2
18–1/8
30–1/2
24–1/2
18–1/8
30–1/2
Height (inches)
1
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INSTALLATION INSTRUCTIONS
LOCATION
Locate the chiller indoors in a well ventilated area with ambient temperatures in the range of 65° F to 100° F.
Allow a minimum of six inches of clearance around the chiller for proper air circulation. Avoid hot air discharge
from other equipment or enclosed areas where heat could build up and cause a rise in ambient temperature.
PLUMBING
Follow standard plumbing practices and local codes in making water connections. Piping that is exposed to high
ambient temperatures may need to be insulated to prevent condensation and/or significant liquid heat gain.
ELECTRICAL
All wiring must conform to the National Electric Code and any applicable local codes. The chiller must be:
1) Permanently wired by means of conduit from the junction box on the rear of the chiller cabinet to a properly
fused disconnect of proper amperage or:
2) Wired to a properly rated power cord and plugged into an outlet with appropriate disconnect and amperage
rating.
START–UP/OPERATION
Before the Unit can be operated, it is important that the circulating system be filled with water (See Fluid Rec-
ommendations page). On systems with a reservoir, ensure that the drain plug is in place and the plug is secure.
Fill the reservoir through the fill port with clean water. The water level sight glass on the front panel will indicate
“Full” when enough water has been added. Once full, make the final connection to the inlet and outlet of the
chiller. On system without a reservoir, the pump should be primed before operation. Attach a water source to
the inlet of the chiller and fill the Unit with clean water. The system is filled when the water can be seen flowing
at the chiller outlet. Once full, make the final connection to the inlet of the chiller.
Turn the power switch to the “On” position. The switch will light indicating power to the Unit and the pump will
operate, the thermostat can be adjusted to the proper setpoint.
Set the standard digital thermostat to the desired setpoint as follows:
1) Push the “Set” button located to the right of the digital display. The current setpoint will show on the display.
2) While the current setpoint is displayed, push the “Up” or “Down” buttons until the desired setpoint shows on
the display.
3) Release all buttons. The display will show the system water temperature after a few seconds. The setpoint
can be viewed at any time by merely pushing the “Set” button.
If the Unit is provided with the electronic differential thermostat, the air probe will need to be located where am-
bient temperature is to be monitored. The setpoint will then be the temperature of the air probe. If this thermo-
stat is provided with a digital display, the setpoint can be checked by pushing the “Setpoint” button located on
the display. Releasing this button will display the system water temperature.
When the flow rate to the process is critical, a flow meter and valve should be installed in the line in order to ob-
tain the proper flow rate.
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Once these start–up procedures are complete, the chiller is ready for standard operation.
NOTE:
1) Never operate the chiller with enclosure panels removed.
2) Always use the illuminated switch to turn off the chiller when it is not being used.
3) Always ensure that all air inlets and outlets are free of obstructions.
MAINTENANCE
WARNING: Disconnect electrical power from the Unit before performing any of the
following maintenance procedures.
The chiller requires very little normal maintenance. The condenser fins should be cleaned by blowing com-
pressed air through the condenser. from the fan side as required to prevent blockage of air flow by dirt and de-
bris that may accumulate over time. The condenser fan motor should be lubricated every six months with a few
drops of SAE 10 oil. The positive displacement pump motor should be lubricated with ten drops of SAE 20 oil
once each year. The circulation system should be drained and flushed periodically to avoid build up and pos-
sible restriction of flow by contaminants. Following these simple procedures will ensure many trouble free hours
of chiller operation.
SERVICE
Service of the chiller is limited to replacing the switch, the thermostat, the fan motor, and the pump. Charging
and other refrigeration problems must be performed by a qualified refrigeration technician.
REMOVING WRAPPER
1. Disconnect electrical power from the Unit.
2. Remove the seven screws from each side of the wrapper and the two screws that secure the wrapper to
the front and back panels. Retain all hardware and lift the wrapper off the Unit.
REPLACING SWITCH
1. Remove the wrapper as specified in REMOVING WRAPPER.
2. Remove the spade lugs from the existing switch and note connection points.
3. Remove the switch from the front panel.
4. Install the new switch in the front panel and connect the leads to the new switch.
5. Install the wrapper.
REPLACING STANDARD THERMOSTAT
1. Remove the wrapper as specified in REMOVING WRAPPER.
2. Loosen the screw terminals securing the wires at the rear of the thermostat. Note connection points and
remove the wires.
3. Remove the screw securing the mounting bracket to the back of the thermostat.
4. Remove the thermostat from the front panel.
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5. Install the new thermostat in the front panel and secure it with the mounting bracket.
6. Reconnect the wires at back of the thermostat.
7. Install the wrapper.
REPLACING ELECTRONIC DIFFERENTIAL THERMOSTAT
1. Remove the wrapper as specified in REMOVING WRAPPER.
2. Remove the two screws securing the thermostat cover and remove the cover.
3. Loosen the screw terminals securing all wires to the thermostat. Note connection points and remove the
wires.
4. If the Unit is provided with a digital display, the ribbon cable should be removed from the thermostat. The
display can be replaced by depressing the plastic clips and removing it from the front panel.
5. Remove the two screws securing the thermostat to the fan shroud and remove the thermostat.
6. Secure new thermostat to the fan shroud, then re–connect all wires and ribbon cable. Replace cover.
7. Install the wrapper.
REPLACING FAN BLADE AND/OR MOTOR
1. Remove the wrapper as specified in REMOVING WRAPPER.
2. Remove the screws securing the fan guard to the fan shroud.
3. Remove the conduit connection at the back of the motor and disconnect the wire leads.
4. Remove the bolts securing the fan mounting bracket to the base and remove the fan/motor assembly.
5. Separate the fan blade from the motor and install the new blade or motor.
6. Re–install the fan mounting bracket and fan guard. Re–connect the wire leads and conduit connection.
7. Install the wrapper.
REPLACING PUMP
1. Remove the wrapper as specified in REMOVING WRAPPER.
2. Remove the clamps and hoses from the suction and discharge of the pump.
3. Remove the screws securing the pump to the base.
4. Disconnect the wire leads from the pump motor and remove the pump.
5. Remove all fittings from the pump and install them on the new pump.
6. Install the pump and re–connect wire leads and hoses.
7. Install the wrapper.
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FLUID RECOMMENDATION
Remcor Chillers are designed to operate with water to provide maximum performance for
temperatures of 40ꢁ F–100ꢁ F.
Distilled Water
Acceptable
Acceptable
De–Ionized Water
(1–5 MEG/OHMS)
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 40ꢁ F
Acceptable – 30% Glycol/70% Water
*For Applications with Temperatures below 40ꢁ F
Acceptable
Lab & Industrial Grade Ethylene Glycol
Mineral/Hydraulic Oils
(Viscosity<50 Centistrokes)
Ethylene Glycol
NOT Acceptable
(Commercial/Automotive Antifreeze)
*Silicate Rust Inhibitors in Automotive/Commer-
cial Antifreeze will damage pump seals and
housing which lead to failure.
Acidic/Basic Solutions
(Above 8/Below 6 PH)
Not Acceptable
Mineral/Hydraulic Oils
Not Acceptable
(Viscosity>50 Centistrokes)
For questions regarding special or other fluids contact IMI Cornelius Remcor at
800–551–4423.
To Purchase Lab or Industrial Glycol contact:
Hubbard Hall
IMI Cornelius
(800) 648–3412 – Dow Therm SR1 available in 5 gallon
(800) 551–4423 – Part# 111521000 5 gallons
5
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TROUBLESHOOTING GUIDE
Trouble
Probable Cause
Remedy
A. Check fuse or circuit breaker.
CHILLER DOES NOT
OPERATE
A. No power.
B. Loose or poor wire connection. B. Check wiring. Correct for loose or
poor wire connection.
C. Inoperable ON–OFF switch.
C. Replace ON–OFF switch.
D. Overload device open.
D. Allow compressor to cool, then
install new overload device;
replace compressor if necessary.
E. Inoperable relay.
F. Low input voltage.
E. Replace relay.
F. Nominal voltage ± 10% is
required.
NO CIRCULATION OF
CHILLED WATER
A. Vinyl tubing kinked.
A. Check tubing and remove kinks.
B. Low water level.
C. Inoperable pump.
B. Ensure that tank is full.
C. Check for obstruction or binding
impeller, replace pump and/or
motor if necessary.
INADEQUATE COOLING
A. Condenser fins dirty.
A. Blow dirt out of fins.
B. Fan motor not operating freely. B. Lubricate and hand spin until fan
rotates freely; replace fan blade
and/or motor if necessary.
C. Water not circulating
D. Low refrigerant level.
C. See “NO CIRCULATION OF
CHILLED WATER”.
D. Charge system with refrigerant.
E. Replace thermostat.
E. Inoperative temperature
control.
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PARTS LIST
FIGURE 1. CH750, CH751 AND CH951 EXPLODED VIEW
620603705
Compressor (CH951)
Item
No.
Part No.
Name
8
9
*
*
Relay
1
31934
Switch, Illuminated
Capacitor
31935
Switch, Illuminated
Thermostat, Eliwell No. EWPC902
Blade, Fan
10
61058, 61001 TXV CH750, CH751
2
3
4
32386
61003
60514
60502
61002
*
TXV CH951
620603708
620603711
620603712
620603713
*
11
12
13
14
15
16
17
18
Sight Glass
Motor, Fan (CH550)
Motor, Fan (CH750)
Motor, Fan (CH551)
Condenser
Control, Low Pressure
Filter Drier
Receiver
5
6
7
Not Used
Not Used
620603701
620603702
620603703
620603704
*
Pump, Circulating
Transformer, Thermostat
Evaporator Assembly
Compressor (CH550)
Compressor (CH551)
Compressor (CH750)
Compressor (CH751)
32378
*
*CONTACT THE SERVICE DEPARTMENT FOR THE APPROPRI-
ATE PART NUMBERS
7
620909701
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WARRANTY
IMI Cornelius Inc. warrants that all equipment and parts are free from defects in material and workmanship un-
der normal use and service. For a copy of the warranty applicable to your Cornelius, Remcor or Wilshire prod-
uct, 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.
IMI Cornelius Offices
AUSTRALIA ꢂ P.O. 210, ꢂ RIVERWOOD, ꢂ NSW 2210, AUSTRALIA ꢂ (61) 2 533 3122 ꢂ FAX (61) 2 534 2166
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BELGIUM ꢂ BOSKAPELLEI 122 ꢂ B-2930 BRAASCHAAT, BELGIUM ꢂ (32) 3 664 0552
ꢂ
FAX (32) 3 665 2307
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ꢂ
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NEW ZEALAND ꢂ 20 LANSFORD CRES. ꢂ P.O. BOX 19-044 AVONDALE ꢂ AUCKLAND 7, NEW ZEALAND
SINGAPORE ꢂ 16 TUAS STREET ꢂ SINGAPORE 2263 ꢂ (65) 862 5542 ꢂ FAX (65) 862 5604
ꢂ
(64) 9 8200 357
ꢂ
FAX (64) 9 8200 361
SPAIN ꢂ POLIGONO INDUSTRAIL ꢂ RIERA DEL FONOLLAR ꢂ E-08830 SANT BOI DE LLOBREGAT ꢂ BARCELONA, SPAIN ꢂ (34) 3 640 2839 ꢂ FAX (34) 3 654 3379
USA ꢂ ONE CORNELIUS PLACE ꢂ ANOKA, MINNESOTA ꢂ (763) 421-6120 ꢂ FAX (763) 422-3255
LD004
4/21/98
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CORPORATE HEADQUARTERS:
Remcor Incorporated
500 Regency Drive
Glendale Heights, IL 60139
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