OPERATION AND INSTALLATION MANUAL
SMC SERIES
AIR COOLED
PORTABLE WATER CHILLERS
IMPORTANT: PLEASE READ CAREFULLY BEFORE ATTEMPTING TO INSTALL
OR OPERATE EQUIPMENT
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Safety Considerations
Sterling, Inc. SMC Series Chillers are designed to provide safe and reliable operation
when installed and operated within design specifications, following national and local
safety codes.
To avoid possible personnel injury or equipment damage when installing, operating or
maintaining this equipment, use good judgment and follow these safe practices:
; Follow all SAFETY CODES.
; Wear SAFETY GLASSES and WORK GLOVES.
; Use care when LOADING, UNLOADING, RIGGING, or MOVING
this equipment.
; Operate this equipment within design specifications.
; OPEN, TAG, and LOCK ALL DISCONNECTS before working on
equipment. It is a good idea to remove the fuses and carry them with you.
; Make sure the chiller is properly GROUNDED before switching power
on.
; When welding or brazing in or around this equipment, be sure
VENTILATION is ADEQUATE. PROTECT adjacent materials from
flame or sparks by shielding with sheet metal. An approved FIRE
EXTINGUISHER should be close at hand and ready for use if needed.
; The refrigeration system can develop refrigerant pressures in excess of
500 PSI (3,450 kPa). DO NOT CUT into the system without first
relieving pressure.
; Do not jump or bypass any electrical safety control.
; Do not restore power until all tools, test equipment etc. have been
removed and the panels replaced.
; Only PROPERLY TRAINED personnel familiar with the information
within this manual should work on this equipment.
SMC Series Chillers
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Table of Contents
1 General Information .................................................7
1-1
1-2
1-3
1-4
1-5
1-6
1-7
1-8
1-9
Introduction
Necessary Documents
Models Covered
Available Options
Uncrating Your New Chiller
In the Event of Shipping Damages
If the Shipment is Not Complete
If the Shipment is Incorrect
Returns
2 Chiller Installation ..................................................13
2-1
2-2
2-3
2-4
2-5
Electrical Connections
Process Water Connections
SMC Condenser Air Supply
Water Reservoir
Overhead Process Considerations
3 Sequence of Operation ..........................................17
3-1
3-2
3-3
3-4
3-5
Chilled Water Circuit
Refrigeration Circuit
High Pressure Cutout
Low Pressure Cutout
Remote Start/Stop Interlock
Page 4
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Table of Contents
4 Startup Checklists..................................................23
4-1
4-2
4-3
4-4
Introduction
SMC Pre-Startup Checklist
SMC Startup Checklist
SMC Water Circuit Pressure Drop Table
5 Microprocessor Control.........................................25
5-1
5-2
5-3
5-4
5-5
5-6
Introduction
Setting the Process Water Temperature
LED Indicators
Temperature Controller Keys
Auto-Tuning SMC Series Chillers
Optional Communications
6 Optional Graphic Panel..........................................30
6-1
6-2
Indicator Lights
Switches
7 Routine Maintenance .............................................32
7-1
7-2
Lubrication
Condenser Maintenance
8 Troubleshooting Guide..........................................36
SMC Series Chillers
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Charts and Figures
Figure 1: SMC050 Process Pump Curves..................................................................................... 11
Figure 2: SMC100 Process Pump Curves..................................................................................... 11
Figure 3: PCA150 Process Pump Curves ..................................................................................... 11
Figure 4: SMC Cast Iron Centrifugal Pump Curve 1/3 hp (0.249 kW)........................................ 12
Figure 5: SMC Series Chiller Specifications................................................................................ 13
Figure 6: Ethylene Glycol Curve.................................................................................................. 16
Figure 7: Overhead Piping........................................................................................................... 17
Figure 8: SMC Component Identification .................................................................................... 20
Figure 9: Piping Schematic - 1 Pump with Reservoir................................................................... 21
Figure 10: Piping Schematic - 1 Pump Without Reservoir........................................................... 22
Figure 11: Piping Schematic - No Pump, No Reservoir............................................................... 23
Figure 12: Typical SMC Series E5CK Microprocessor Controller.............................................. 27
Figure 13: Optional Graphic Panel ............................................................................................... 32
Figure 14: Typical SMc Subpanel ................................................................................................ 33
Figure 15: Typical SMc Wiring Schematic .................................................................................. 34
Figure 16: SMC Wiring Schematic for Chillers with No Pump or Reservoir.............................. 35
Page 6
SMC Series Chillers
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1
General Information
1-1 Introduction
Sterling, Inc.'s SMC Series Water Chillers are reliable, accurate, and easy-to-use air
cooled chillers designed for use with water/glycol. Standard range of operation is 30°F
(-1°C) to 65°F (18°C) for applications using glycol and 45ºF (7ºC) to 65°F (18°C) for
water-only applications. A crankcase pressure regulating valve option is available for
processes requiring a leaving water temperature of up to 75°F (24°C). PCA models are
available in 1/2 hp (373 W), 1 hp (746 W), and 1-1/2 hp (1,118 W) models and have an
internal six gallon (23 liter) reservoir. All models are self contained, fully assembled,
and shipped ready to use.
A properly installed, operated, and maintained SMC Series Chiller will provide many
years of reliable operation. To get the most satisfaction from your new chiller, read and
follow the instructions in this manual.
1-2 Necessary Documents
The following documents are necessary for the operation, installation and maintenance
of Sterling, Inc.'s SMC Series Chillers. Additional copies are available from AEC, Inc.
Familiarize the appropriate personnel with these documents:
; This manual.
; The electrical schematic and connection diagram mounted inside the control
enclosure. Typical schematics for general reference are provided in Figure 15 and
Figure 16 on pages 34 and 35.
; The operation and installation manuals for installed accessories and options.
; The Customer Parts List included in the information packet.
1-3 Models Covered
This manual provides operation, installation, and maintenance instructions for Sterling,
Inc. SMC Series Chillers.
Model numbers are on the serial tag. Please know the model number, serial number and
operating voltage of your chiller if you need to contact Sterling, Inc.
SMC Series Chiller models are designated by approximate compressor horsepower. A
SMC050 chiller has a 1/2 hp (373 W) compressor, a SMC100 chiller has a 1 hp (746
W) compressor, and a SMC150 chiller has a 1-1/2 hp (1,118 W) compressor.
SMC Series Chillers
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1-4 Available Options
SMC Series Chillers are available with options that tailor the unit to your requirements.
Some are factory installed, some can be retrofitted in the field. Consult your local
Sterling, Inc. Sales Representative. Some of these options are:
Special Pumps
Special pump options are available for greater pressure and flow rates. Bronze and
stainless steel wetted surface standard flow pumps ranging from 30 psi (207 kPa) to 60
psi (414 kPa) are available.
Reservoirs
SMC Series Chillers are available without a reservoir for processes that use their own
reservoir.
Power Cord
A 10 foot (3 meter) power cord is available to speed SMC installation.
Casters
Four 2 inch (5 cm) swivel casters add mobility to the SMC unit.
CPR Valve
A crankcase pressure regulating (CPR) valve is available for leaving water
temperatures up to 75°F (24°C).
1-5 Uncrating Your New Chiller
SMC Series Chillers are shipped mounted on a skid, enclosed in a plastic wrapper, and
open crated on all four sides and top.
; Pry the crating away from the skid and remove. Use a pry bar to remove the blocks
securing the unit to the skid.
; Lift the unit off the skid with a fork truck. Insert forks between skid and chiller from
the side until they protrude beyond the opposite side of the unit. The forks must be
equidistant from the center line of the unit and the unit must be balanced on the
forks.
; Lift slowly and only high enough to clear the skid. Use a pry bar if necessary to
remove the skid from the unit.
; Lower slowly. The unit will land on its feet or casters and can be moved into
position.
Page 8
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1-6 In the Event of Shipping Damages
IMPORTANT!
According to the contract terms and conditions of the Carrier,
the responsibility of the shipper ends at the time and place of shipment.
The Carrier then assumes full responsibility of the shipment.
; Notify the transportation company's local agent.
; Hold the damaged goods and packing material for the examining agent's inspection.
Do not return any goods to Sterling, Inc. before the transportation company
inspection and authorization.
; File a claim against the transportation company. Substantiate the claim by referring
to the agent's report. A certified copy of our invoice is available upon request. The
original Bill of Lading is attached to our original invoice. If the shipment was
prepaid, write us for a receipted transportation bill.
; Advise Sterling, Inc. regarding your wish for replacement.
1-7 If the Shipment is Not Complete
Check the packing list. The apparent shortage may be intentional. Back-ordered items
are noted on the packing list. You should have:
; SMC Series Chiller
; Bill of Lading
; Packing List
; Operating and Installation Packet
Re-inspect the container and packing material to see if smaller items have been missed
during unpacking. Determine that the item was not taken from the area before the
shipment was checked in. Notify the Sterling, Inc. parts and service department
immediately of the shortage at (262) 641-8610.
1-8 If the Shipment is Incorrect
; If the shipment is not what you ordered, contact Sterling, Inc. immediately. Include
the order number and item.
; Hold the items until shipping instructions are received.
SMC Series Chillers
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1-9 Returns
IMPORTANT!
Do not return any damaged or incorrect items until
you receive shipping instructions from STERLING, Inc.
Page 10
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Figure 1: SMC050 Process Pump Curves
Figure 2: SMC100 Process Pump Curves
Figure 3: SMC150 Process Pump Curves
SMC Series Chillers
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Figure 4: SMC Cast Iron Centrifugal Pump Curve 1/3 hp (0.249 kW)
Page 12
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Figure 5: SMC Series Chiller Specifications
Optional gauge package
Optional gauge package
Power cable entrance,
either side
Side cover
handle
Sight glass
Drain plug
PUMP
PRESSURE
(3/4" NPT)
Mini Chiller
PC Series
Portable Chiller
ON
LOW
HIGH
PUMP
ON
COMPRESSOR
ON
REFRIGERANT
PRESSURE
REFRIGERANT
PRESSURE
POWER
To Process
(3/4" NPT)
No Flow indicator
(for pumpless
units only)
OFF
A0537868
NO FLOW
34"
Application
Engineering
18 7/16"
From Process
(3/4" NPT)
13 7/16"
Rear View
Optional Casters
26"
Right Side View
20"
Front View
Capacity
@ 65°F
LWT 75°F
Ambient
(Btuh)
Capacity
@ 50°F
LWT 90°F
Ambient
(Btuh)
Nominal
Chilled
Water
Amp
Draw
230/1/60
Process
Connection
(inches NPT)
Dimensions
(inches)
W
Operating
Weight
(lbs)
Shipping
Weight
(lbs)
Model
Number
Compressor
Pump
(gpm)
(hp)
Running
L
H
1/3 hp,
1.2 gpm
@ 24 psig
1/3 hp,
2.4 gpm
@ 34 psig
1/3 hp,
3.6 gpm
@ 24 psig
1/2
3/4
SMC-050
8,100
14,000
25,400
4,800
9,550
1.2
2.4
3.6
8A
20
20
20
26
26
26
34
265
325
345
265
325
345
3/4
3/4
SMC-100
SMC-150
10A
12A
34
34
1
1-1/2
16,000
Capacity
@ 18°C
LWT, 24°C
Ambient
(watts)
Capacity
@ 10°C
LWT, 32°C
Ambient
(watts)
Nominal
Chilled
Water
Amp
Draw
230/1/60
Process
Connection
(inches NPT)
Dimensions
Operating
Weight
(kg)
Shipping
Weight
(kg)
Model
Compressor
(watts)
Pump
(cm)
W
Number
(lpm)
Running
L
H
224 watts,
4.5 lpm
@ 207
kPa
3/4
3/4
3/4
SMC-050
SMC-100
2,374
4,103
1,407
2,800
4.5
9.0
373
746
8A
51
51
66
66
86
120
147
120
147
224 watts,
9.0 lpm
@ 234
kPa
10A
86
86
224 watts,
13.6 lpm
@ 207
SMC-150
7,444
4,690
13.6
1,118
12A
51
66
156
156
kPa
SMC Series Chillers
Page 13
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2
Chiller Installation
2-1 Electrical Connections
Check serial tag voltage and amperage requirements and make sure your electrical
service conforms. See Figure 5 on page 13 for total running amps.
Bring properly sized power leads and ground from a fused disconnect (installed by your
electrician) to the main power terminal in the chiller's electrical enclosure.
; Electrical connections must comply with all applicable electrical codes
; The chiller must be grounded in accordance with NEC Article 250
; Voltage must be within 10% of the chiller's nameplate rating.
2-2 Process Water Connections
; All external chilled water connections to the process must be of adequate size.
; See Figure 7 on page See 17 for sizing recommendations.
; The largest possible openings and passages should be provided for the flow of
chilled water through platens, dies, molds or other pieces of equipment.
IMPORTANT!
Keep any pressure drop in external process piping
to an absolute minimum for optimum unit operation.
To Process
Connect the TO PROCESS chilled water supply outlet to the process being cooled.
From Process
Connect the FROM PROCESS chilled water return inlet to the return from the process
back into the chiller for cooling and recirculation.
; Sterling, Inc. recommends a strainer on the FROM PROCESS return line.
Page 14
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Process Water Bypass
All SMC chillers have an internal bypass device (patent pending). If the process flow
becomes blocked during chiller operation, this component allows water to flow through
the chiller. This protects the chiller from freeze-up, excessive pressures, and pump
damage, and allows other safety features to remain effective.
2-3 PCA Condenser Air Supply
SMC chillers use the surrounding air to cool the condenser.
; Condenser air entering the SMC unit should be at least 65°F (18°C). Operation with
air below 65°F (18°C) can cause the low pressure cutout to shut down the chiller
due to the low refrigerant pressure.
; Install the chiller in an area where there is free passage of air for condensing.
; Provide 18" (46 cm) or more clearance for the chiller's air intake.
; Make provisions to exhaust the heated air discharged from the chiller.
; Do not put the SMC unit where steam, hot air or fume exhausts will be drawn into
the condenser.
; Air-cooled condensers must be cleaned frequently. Neglect reduces capacity,
increases operating costs, and leads to possible chiller failure. See Chapter 7 on
Page 29 for cleaning instructions.
; Normal condensing pressure with 95°F (35°C) air is approximately 180 psi (1,241
kPa) for the SMC050 and SMC100; 275 psi (1,897 kPa) for the SMC150.
PCA Ambient Temperature Ranges
Ambient Temperature Range Minimum Temperature Maximum Temperature
Operation
Storage
65°F (18°C)
40°F (4°C)
100°F (38°C)
120°F (49°C)
2-4 Water Reservoir
During startup and when additional solution is required, see Figure 6 on page 16 for the
recommended ethylene glycol/water solution. This chart shows the proportions needed
to provide freeze protection to 20°F/°C below the desired process setpoint.
; Add a pre-mixed solution to provide freeze protection to a temperature 20°F/°C
below the normal operating temperature of the chiller.
; Use industrial quality (not automotive) ethylene glycol.
SMC Series Chillers
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; A corrosion inhibitor suitable for the materials in the system should be added to the
glycol/water solution.
; If straight water use is desired, contact the Sterling, Inc. Engineering Department.
; The six gallon (23 liter) reservoir is not designed to withstand water pressure above
5 psi (34 kPa).
; The fill opening and vent line must be vented to the atmosphere for proper
operation.
Figure 6: Ethylene Glycol Curve
Ethylene Glycol Required
for Evaporator Freeze Protection
30%
Ethylene
Glycol
20%
Percent
by
Volume
10%
0%
25°
55°
65°
35°
45°
Chilled Water
Operating Temperature °F
(Set Point)
Normal Operating Range between 30°F - 70°F
Page 16
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2-5 Overhead Process Considerations
If your application has chilled water or process piping above the reservoir fill and vent
level, install a standpipe to a point 1’ (30 cm) above the highest point in the system.
In applications where the process or its piping is 15 feet (4.6 m) or more above the
reservoir, you must take steps to prevent over-pressurization of the reservoir. This
condition can occur on system shutdown when the water in the system drains into the
reservoir.
To prevent this, install a check valve in the unit TO PROCESS line and a vacuum
breaker at the high point of the return FROM PROCESS line. See Figure 7 below for
more information.
Note: The reserve capacity of the reservoir can hold a volume equal to 20 feet (6.1 m)
of 1-inch (2.5 cm) pipe.
Figure 7: Overhead Piping
Vent
The reservoir vent & fill line
to be piped 12" above the highest
point of the system. The vent line
Vacuum Breaker
Assembly
Cap
must remain open to the atmosphere.
12"
Check
Valve
1/8"
Hole
1/4"
6" Min.
Process Return
Process Supply
Strainer
Add check valve
if system piping
extends 15 feet
above reservoir.
I
Indicates end of Sterling
piping
SMC Series Chillers
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3
Sequence of Operation
IMPORTANT!
• The SMC unit has a leaving water temperature range of 30°F (-1°C) to 65°F
(18°C). Do not attempt to run the SMC unit outside this temperature range or
damage to the unit may occur.
• When operating the SMC unit between 30°F (-1°C) and 40°F (5°C), you must
use a solution of 75% water and 25% industrial-grade ethylene glycol with a
suitable corrosion inhibitor to protect the SMC unit from freeze-up. See
Figure 6 on page 16 for more information.
Such damage is not covered by the Sterling, Inc. warranty.
3-1 Chilled Water Circuit
Figure 9, Figure 10, and Figure 11
; Process cooling water supply and return connections are made at the pipe stubs at
the rear of the chiller.
; Warm water returns from the process and enters the reservoir tank.
; The process water is pumped through the evaporator where it is cooled.
; The coolant flows to the process and returns to repeat the cycle.
; A chilled water bypass assembly (patent pending) between the supply and return
lines guarantees a constant flow through the evaporator during intermittent low or
no-flow conditions.
; A flow switch in units without pumps will prevent the compressor from running
without adequate flow through the evaporator
3-2 Refrigeration Circuit
; Liquid refrigerant from the condenser passes through a filter/dryer which removes
moisture and other contaminants.
; The refrigerant then passes through the thermal expansion valve which allows the
refrigerant to expand and cool the inside of the heat exchanger. The refrigerant
flows through the suction line to the compressor.
; The refrigerant gives up its heat as it re-condenses to a liquid in the condenser and
the cycle starts over again.
Page 18
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3-3 High Pressure Cutout
The high pressure cutout is an electro-mechanical safety feature that opens the control
circuit if the system condensing pressure exceeds a safe level. The chiller will
automatically restart when the pressure drops back to an acceptable level.
Model
Cuts out if condensing pressure exceeds:
275 psi (1,897 kPa)
SMC050
SMC100
SMC150
275 psi (1,897 kPa)
400 psi (2,759 kPa)
IMPORTANT!
Call a refrigeration service technician to analyze
the problem if high pressure recurs.
3-4 Low Pressure Cutout
The low pressure cutout is an electro-mechanical safety feature that prevents
compressor suction pressure from dropping below a preset point.
It is factory set to open the control circuit when pressure drops below a safe level. The
chiller will automatically restart when the suction pressure reaches an acceptable level.
Model
Cuts out if suction pressure falls below:
15 psi (103 kPa)
SMC050
SMC100
SMC150
15 psi (103 kPa)
35 psi (241 kPa)
3-5 Remote Start/Stop Interlock
A contact is provided to allow interlocking of the SMC Series Chiller with process
controls. To use this feature, remove the jumper between Terminals X1 and 1 on
Terminal Block 1. Supply a switch or dry contact interlock connected in series between
these two terminals. See Figure 15 and Figure 16 on pages 34 and 35 for more
information.
SMC Series Chillers
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Figure 8: SMC Component Identification
Page 20
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Figure 9: Piping Schematic - 1 Pump with Reservoir
Air-cooled condenser
Discharge line
Liquid line
Refrigeration
evacuation valve
Relief
valve
Refrigeration
evacuation valve
Filter
Filter
Suction
Line
Drier
Expansion Sight
valve
glass
Evaporator
Legend
Refrigeration lines
Equalizing line
Power element
Chilled water piping
Condenser water piping
Refrigeration
access valve
End of unit piping
Optional
pressure
gauge
Temperature
probe
TC
High
pressure
control
S
P
To
Process
Low
pressure
control
Bypass
Optional
CPR valve
Refrigeration
access valve,
compressor-mounted
Compressor
Vent
Fill
Sight
glass
Tank
Drain
Pump
From
Process
SMC Series Chillers
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Figure 10: Piping Schematic - 1 Pump Without Reservoir
Air-cooled condenser
Discharge line
Liquid line
Refrigeration
evacuation valve
Relief
valve
Refrigeration
evacuation valve
Filter
Filter
drier
Suction
line
Legend
Refrigeration lines
Chilled water piping
Condenser water piping
End of unit piping
Expansion
valve
Sight
glass
Evaporator
Equalizing line
Power element
Refrigeration
access valve
Optional
pressure
gauge
Temperature
probe
TC
High
pressure
control
S
P
To
Process
Low
pressure
control
Optional
CPR valve
Bypass
Refrigeration
access valve,
Compressor
compressor-mounted
From
Process
Pump
Page 22
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Figure 11: Piping Schematic - No Pump, No Reservoir
Air-cooled condenser
Discharge line
Liquid line
Refrigeration
evacuation valve
Relief
valve
Refrigeration
evacuation valve
Filter
Filter
drier
Suction
line
Expansion
valve
Legend
Sight
glass
Refrigeration lines
Chilled water piping
Condenser water piping
End of unit piping
Evaporator
Equalizing line
Power element
Refrigeration
access valve
Optional
pressure
gauge
Temperature
Probe
TC
High
pressure
control
P
S
To
Process
Low
pressure
control
Bypass
Optional
CPR valve
Refrigeration
access valve,
Compressor
compressor-mounted
Flow
switch
From
Process
SMC Series Chillers
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4
Startup Checklists
4-1 Introduction
Follow the check lists below for the startup of your new chiller. These lists assume the
installation information elsewhere in this manual has been read and followed. New
chillers should be started up and checked by a qualified refrigeration service technician.
4-2 SMC Pre-Startup Checklist
1. Check the shipping papers against the serial tag to be sure chiller size, type and
voltage is correct for the process that will be controlled.
2. Check the transformer primary voltage connections to be sure they are
configured for the electrical power you are using. The voltage at the main power
connection must read within +/-10% of the voltage listed on the serial tag.
Electrical connections must conform to all applicable codes.
3. The chilled water TO PROCESS and FROM PROCESS connections should be
completed.
4. Be sure the reservoir tank and chilled water circuit piping are filled with water.
5. The air-cooled condenser should have an adequate supply of air for proper
operation.
6. Connect main power to the chiller and run the chiller just long enough to see if
the pump is generating normal pressure.
7. Check your work and proceed to the SMC Startup Checklist section below.
4-3 PCA Startup Checklist
1. Turn ON the chiller. The SMC chiller should continue to run until the switch is
turned OFF.
2. Put the SMC chiller under a process load.
3. Set the microprocessor control to the desired process temperature setpoint using
the
,
, and
buttons. See Chapter Five on Page 25 for more
information.
4. Check the pump amp draw and pump pressure. The amp draw reading must be
within the running load and service factor amps.
5. Operate the chiller, looking for leaks and listening for unusual noises or
vibrations that could indicate improper operation.
Page 24
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4-4 SMC Water Circuit Pressure Drop Table
Model
SMC050
Gallons per minute
Liters per minute
ΔP (psig)
2.5
ΔP (kPa)
17.3
27.6
51.8
86.2
17.3
17.3
20.7
34.5
17.3
17.3
20.7
24.2
2.0
2.4
3.6
4.8
2.0
2.4
3.6
4.8
2.0
2.4
3.6
4.8
7.5
9.0
13.6
18.1
7.5
4.0
7.5
12.5
2.5
2.5
3.0
5.0
2.5
2.5
SMC100
SMC150
9.0
13.6
18.1
7.5
9.0
13.6
18.1
3.0
3.5
SMC Series Chillers
Page 25
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5
Microprocessor Control
5-1 Introduction
Standard SMC Series chillers use a microprocessor-based PID controller. The
controller is a modular, self-contained unit that can slide from its mounting housing. It
is factory set and adjusted; no field adjustment to the internal controls is necessary.
SMC Control Operation Range
Standard models 30°F to 65°F (-1ºC to 18ºC)
5-2 Setting the Process Water Temperature
To change the process water temperature set point:
• Press the
Up Arrow button to raise the set point.
• Press the
Down Arrow button to lower the set point.
5-3 LED Indicators
PV or Process Value Numeric LED
During normal operation, the large red PV LED on the controller displays the actual
process temperature at the To Process thermocouple. It also lists parameter symbols
during setup and error messages if an error occurs.
SV or Set Value Numeric LED
During normal operation, the green SV LED on the controller displays the process set
point you want the chiller to maintain. It also displays parameter and pre-set function
values during setup.
OUT1 LED
The orange OUT1 LED lights when the control output energizes the hot-gas bypass
solenoid valve.
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Figure 12: Typical SMC Series E5CK Microprocessor Controller
PV
SV
OUT1
OUT2 MANU STOP RMT
AT
SUB1
AT
OMRON
E5CK
OUT2 LED
The orange OUT2 energizes whenever the process temperature is two degrees (2°F/ºC)
or more above the To Process set point. The compressor then comes on and runs until
the temperature at the To Process thermocouple is two degrees (2°F/ºC) below the set
point.
This +2°F/ºC control set point is factory-set for proper compressor operation. Changing
it is not recommended without consulting the AEC Service Department.
MANU LED
The orange MANU LED does not light because it is not used.
STOP LED
The orange STOP LED does not light because it is not used.
SMC Series Chillers
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RMT LED
The orange RMT LED is lit during remote operation.
AT LED
The orange AT LED flashes during auto-tuning.
SUB1 LED
The orange SUB1 LED energizes whenever the process temperature is two
degrees (2°F/ºC) or more below the To Process set point. The compressor then
shuts down by means of a latching circuit, and does not run again until the
temperature at the To Process thermocouple is two degrees (2°F/ºC) above the
set point.
This +2°F/ºC control set point is factory-set for proper compressor operation.
Changing it is not recommended without consulting the Stelring Service
Department.
5-4 Temperature Controller Keys
AT AT Key
Press and hold the AT AT key for two seconds to initiate or stop
the auto-tune function.
Display Key
The functions of the
Display key change, based on how
long you press it. Press the Display key for less than one (1)
second to scroll through parameters within the mode.
Press the Display key for at least one (1) second or more to display
the menu; this function also lets you select the mode you need to
adjust.
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Important!
Do not change any of the control settings without consulting
the Sterling Service Department.
The AEC, Inc. warranty does not cover chiller failures
from tampering with controller settings!
Down Key
Each press of the
Down Arrow key decrements or reduces
the values or settings on the SV display.
Up Key
Each press of the
Up Arrow key increments or advances
the values or settings on the SV display.
5-5 Auto-Tuning SMC Series Chillers
The Auto-Tune function lets you fine-tune the control PID to
process requirements. Activate the Auto-Tune function whenever
the process under control changes. Don't be alarmed by control
response. It may take the process temperature above and below the
set points as many as three (3) times. It will then level off and
control to the process set point. Auto tuning can take up to 45
minutes, and is best done before any product is being run.
Important!
Factory default settings are: P = .3, I = 7, and D = 1
To auto-tune the controller:
„ Press and hold down the AT AT key for several seconds until
the AT indicator flashes.
„ The AT LED flashes to indicate that the control is tuning
itself.When the AT LED light stops flashing, the controller is
tuned and ready for operation.
SMC Series Chillers
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5-6 Optional Communications
Standard Omron Protocol
The communications function allows you to monitor and set E5CK parameters by a
program prepared and running on a host computer connected to the E5CK controller.
When using the communications function, you must add on the unit for RS-232C or
RS-485 communications. The E5CK communications function allows you to read/write
parameters, do operating instructions, and select the setting level.
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6
Optional Graphic Panel
6-1 Indicator Lights
PUMP ON (green)
This indicator lights when the pump is running.
COMPRESSOR ON (green)
This indicator lights when the compressor is operating.
HIGH REFRIGERANT PRESSURE (red)
This indicator lights if the condensing pressure exceeds a safe level. The chiller goes to
Idle mode until the high refrigerant pressure cutout resets. The light then goes out and
the chiller automatically restarts. Call a qualified refrigeration service technician for
service.
LOW REFRIGERANT PRESSURE (red)
This indicator lights if the refrigerant pressure drops below a safe level. The
compressor will stop and remain off until the pressure reaches a safe level. The light
will go out and the chiller will then resume operation automatically.
LOW WATER FLOW (red), PCA units without pump only
This indicator lights if the flow switch senses chilled water/glycol flow through the
evaporator dropping to an unacceptable level. The compressor will stop until the flow
switch senses adequate flow and restarts the chiller.
6-2 Switches
POWER
This switch energizes the control circuit and also turns off the chiller.
SMC Series Chillers
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Figure 13: Optional Graphic Panel
PC Series
Portable Chiller
ON
LOW
HIGH
ON
PUMP
ON
COMPRESSOR
ON
REFRIGERANT
PRESSURE
REFRIGERANT
PRESSURE
AL
POWER
O
RO E5CS
OFF
A0537868
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7
Routine Maintenance
7-1 Lubrication
Every three months, grease all fan motors and pump motors that do not have
permanently sealed bearings. Remove grease relief plug (motors only) before adding
grease. Failure to do so may result in dislodging the bearing grease retainer, eventually
causing bearing failure.
Compressors are hermetically sealed; no oiling is required.
7-2 Condenser Maintenance
Dirty condenser heat exchange surfaces reduce system capacity.
Brush or vacuum light dirt accumulations. Avoid bending or damaging the fins. Heavy
soil accumulations on the coil require professional steam cleaning; washing from the
outside only makes matters worse.
Figure 14: Typical SMC Subpanel
Distribution
Block
Grounding
Lug
Terminal
Blocks
Control Voltage
Transformer
Pump
Contactor
Condenser
Contactor
SMC Series Chillers
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Figure 15: Typical SMC Wiring Schematic
1C
1L1
1T1
Pump
1MTR
2MTR
3MTR
1L2
1T2
2T1
2C
1L1
Compressor
1L2
2T2
3T1
Earth
ground
Fan
3T2
Remote
interlock
by others
1L2
1L1
1T
230V
115V
Control
power
ON/OFF
Subpanel
ground
Jumper
1FU
1S-1LT
2
1
X1
2
1S-1LT
"Power On"
G
Pump
starter
3
1C
"Low Refrig
Pres"
"Hi Refrig
Pres"
2LT
G
"Pump On"
3LT
4LT
R
R
1PS
2PS
Condensing unit
contactor
4
5
6
2C
G
5LT
"Compressor On"
6
1
7
2
8
9
4
10
5
1CNTL
Jumper
3
Legend
Customer wiring/Customer-supplied components
Optional components
(+)
YEL
(-)
RED
Type K Thermocouple
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Figure 16: SMC Wiring Schematic for Chillers with No Pump or Reservoir
1C
1L1
1T1
Compressor
1MTR
1L2
1T2
2T1
1L2
1L1
Fan
2MTR
Remote
interlock
by others
Earth
ground
2T2
230V
115V
Control
power
ON/OFF
1T
Subpanel
ground
Jumper
1FU
1S-1LT
2
2
1
X1
1S
1S-1LT
G
"Power On"
"Low Refrig
Pres"
"High Refrig
Pres"
31
"No Flow"
2LT
3LT
4LT
R
R
R
1FLS
1PS
2PS
Condensing unit
contactor
4
5
5
6
7
1C
G
5LT
"Compressor On"
2
Legend
6
7
2
8
9
4
10
5
Customer wiring/Customer-supplied components
Optional components
Jumper
3
1CNTL
1
(+)
(-)
YEL
RED
Type K thermocouple
SMC Series Chillers
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- Notes -
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8
Troubleshooting Guide
Problem
Chiller will not run.
Cause
Solution
Check main disconnect
fuses, wiring, and power
lead to the unit.
No power.
Voltage must be within plus
or minus 10% of the
nameplate rating.
Replace.
Wrong voltage supplied to
the chiller.
Defective on/off switch.
Replace, check the
transformer.
Control circuit fuse blown.
Defective control
transformer.
Replace.
Pump runs, compressor
cycles at short intervals.
No process load on the
chiller.
Increase the process load.
Check the refrigerant
charge.
Check the refrigerant
charge.
Refrigerant is low.
Refrigerant is low.
The leaving water
temperature is too high.
Make sure that the coolant
solution is right for the
process — must be 75%
water and 25% glycol.
See Figure 6 on page 16
for more information.
Improper water/glycol
solution.
Pump pressure is low (see
pump curves).
Pump pressure is too high.
Check for foreign matter.
Restricted water flow.
Clean the system.
Check for partially closed
valves, etc. Be sure all
lines are properly sized.
SMC Series Chillers
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Problem
Pump runs, compressor
will not.
Cause
Solution
Check the refrigerant
charge.
Refrigerant is low.
Sight glass should be clear
while compressor runs.
Call for service if bubbling
or foaming
Pressure switch contacts
are open.
Refrigerant high pressure
cutout switch contacts are
open.
Check for dirty condenser.
Check for condenser air
obstruction.
Defective fan motor.
Repair or replace.
Check for high/low voltage.
Must be within plus or
minus 10% of the
nameplate rating. Check
for poor compressor
electrical connections.
Compressor internal
overload is open. Allow
time to cool and reset.
Broken wire in the
compressor control circuit.
Locate and repair.
Unit runs continuously, but Restricted condenser
Clean the condenser.
not enough cooling power.
airflow.
Unit low on refrigerant.
Inefficient compressor.
Unit undersized for
application.
Call Service.
Call Service.
Call Sales Representative.
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PCA Unit Parts List
Part Number
Part Description
A0537868
A0537899
A0534584
A0534586
A0500857
A0534269
A0537955
A0533873
A0539409
A0103778
A0537900
A0537908
A0537915
A0543063
A0537916
A0537917
A0501642
A0104093
A0537974
SMC Graphic
BZ Pressure Gauge
Red Neon Graphic Light *
Green Neon Graphic Light *
2” Swivel Casters
1/16 DIN Digital Temperature Controller
Process Water Flow Switch
Thermocouple, 8’
150 VA Transformer
Rubber Feet
Tank Sight Glass Assembly
Handles
SMC050-100 Low Refrigerant Pressure Switch
SMC150 Low Refrigerant Pressure Switch
SMC050-100 High Refrigerant Pressure Switch
SMC150 High Refrigerant Pressure Switch
SMC050-100 High Refrigerant Pressure Safety Relief Valve
SMC150 High Refrigerant Pressure Safety Relief Valve
Bronze Y Strainer
* Units with the optional SMC graphic panel.
SMC Series Chillers
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- Notes -
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- Notes -
SMC Series Chillers
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-Notes -
Technical Assistance
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Parts Department
Call toll-free 7am - 5pm CST [800] 423-3183
Or call [262] 641-8610, Fax [262] 641-8653
The Parts Department at AEC, Inc. is ready to provide the parts to keep your systems up and running. AEC
replacement parts ensure operation at design specifications. Please have the model and serial number of your
equipment when you call. Consult the Customer Parts List included in your information packet for replacement part
numbers
Service Department
Call toll-free 8am - 5pm CST [800] 423-3183
Or call [262] 641-8610
Emergencies after 5pm CST, call [847] 439-5655
AEC has a qualified service department ready to help. Service contracts are available for most AEC products.
Sales Department
Call [262] 641-8610 Monday - Friday 8am -5pm CST
AEC products are sold by a world-wide network of independent sales representatives. Contact our Sales Department
for the name of the sales representative nearest you.
Contract Department
Call [262] 641-8610 Monday - Friday 8am - 5pm CST
Let AEC install your system. The Contract Department offers any or all of these services: project planning; system
packages including as-built drawings; equipment, labor and construction materials; union or non-union installations;
and field supervision
Sterling, Inc.
2900 S. 160th Street
New Berlin, WI 53151
[262] 641-8610 • Fax [262] 641-8653
SMC Series Chillers
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