Mueller CP2-10 User manual

Original English Version
Part No. 8826880
Effective December 21, 2011
Revised June 7, 2023
Compact Chiller
Models CP2-10 and CP2-20
INSTALLATION AND OPERATION MANUAL

Compact Chiller
Models CP2-10 and CP2-20
INSTALLATION AND OPERATION MANUAL
Section 1.0 – Introduction
1.1 General .......................................................................................................................1
1.2 Technical Support ...........................................................................................................1
1.3 Safety Statement.............................................................................................................1
1.4 Intended Use of Equipment .................................................................................................1
1.5 Misuse of Equipment ........................................................................................................1
Section 2.0 – Description of the Equipment
2.1 Equipment Components.................................................................................................... 2
Figure 1: Compact Chiller Cooling System................................................................................. 2
Figure 2: Compact Chiller Piping Schematic .............................................................................. 3
Figure 3: Compact Chiller Cooling System Dimensions and Weights .................................................... 3
2.2 Refrigeration Components ................................................................................................. 4
2.3 Evaporator .................................................................................................................. 4
2.4 Liquid Solution Flow Components......................................................................................... 4
2.5 Electrical Components ......................................................................................................5
Table 1: Electrical Specifications............................................................................................5
2.6 Control Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Section 3.0 – Installation
3.1 Inspection ................................................................................................................... 6
3.2 Handling .................................................................................................................... 6
3.3 Unloading the Compact Chiller ............................................................................................ 6
3.4 Skid Removal................................................................................................................ 6
3.5 Anchoring the Compact Chiller ............................................................................................ 6
Figure 4: Fork Lift Crated................................................................................................... 7
Figure 5: Skid Removal ..................................................................................................... 7
Figure 6: CP2 Compact Chiller Anchor Points............................................................................. 8
3.6 Location ..................................................................................................................... 8
3.7 Chilled Solution Piping ..................................................................................................... 8
3.8 Condensing Unit Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table of Contents
Mueller Compact Chiller, Models CP2-10 and CP2-20 Effective December 21, 2011
Installation and Operation Manual, Part No. 8826880 Revised June 7, 2023

Section 4.0 – Cleaning the System
4.1 First Time Startup .........................................................................................................10
4.2 Leak Testing Procedure ...................................................................................................10
4.3 Cleaning Procedure........................................................................................................10
4.4 Filling the Reservoir .......................................................................................................10
4.5 Liquid Solution for Instant Cooling ........................................................................................11
Table 2: Typical Freezing Points of Aqueous Solution of Dowfrost™ .....................................................11
Section 5.0 – Evacuation, Charging, and Startup of System
5.1 System Evacuation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.2 System Charging (Also Refer to Condensing Unit Method).............................................................. 12
5.3 System Startup............................................................................................................. 12
5.4 High-Pressure Control .................................................................................................... 13
5.5 Low-Pressure Control ..................................................................................................... 13
5.6 Thermal Expansion Valve ................................................................................................. 13
5.7 Temperature Control Calibration Accuracy .............................................................................. 13
Section 6.0 – Equipment Sound Level
6.1 Sound Testing Equipment .................................................................................................14
6.2 Sound Measurement....................................................................................................... 14
Section 7.0 – Multi-Stage Chiller Control Installation
7.1 Box Removal ............................................................................................................... 15
7.2 Site Requirements ......................................................................................................... 15
7.3 Electrical Requirements................................................................................................... 15
7.4 Instructions for Mounting the Multi-Stage Chiller Control Enclosure.................................................. 15
Table of Contents
Mueller Compact Chiller, Models CP2-10 and CP2-20 Effective December 21, 2011
Installation and Operation Manual, Part No. 8826880 Revised June 7, 2023

Section 8.0 – Multi-Stage Chiller Control Electrical Wiring
8.1 Multi-Stage Temperature Control ........................................................................................ 16
8.2 Digital Temperature Sensor Installation.................................................................................. 16
8.3 Digital Temperature Sensor Wiring....................................................................................... 16
8.4 Field Wiring................................................................................................................ 17
Figure 7: Sensor/Remote Start/Flow Switch Wiring Schematic ........................................................ 17
Figure 8: Relay Board ...................................................................................................... 18
Figure 9: 24-VAC Output ..................................................................................................18
Figure 10: Dry Switch Closure Output .................................................................................... 19
8.5 Flow Switch and Remote Switch Wiring ................................................................................. 19
Section 9.0 – Multi-Stage Chiller Control Programming
9.1 Programming Overview ...................................................................................................20
9.2 Programming Parameters .................................................................................................20
9.3 Programming Parameters Chart ..........................................................................................21
Section 10.0 – Multi-Stage Chiller Control Operation
10.1 General .....................................................................................................................22
10.2 Off/Pump/Chiller Rotary Selector Switch ...............................................................................22
10.3 Operational Overview .....................................................................................................22
10.4 Alarm Features.............................................................................................................23
Section 11.0 – Chiller Maintenance
11.1 General .....................................................................................................................24
11.2 Safety Alert.................................................................................................................24
Section 12.0 – Disposal
12.1 General .....................................................................................................................25
12.2 Refrigerant .................................................................................................................25
12.3 Refrigerant Oil .............................................................................................................25
12.4 Propylene Glycol ...........................................................................................................25
12.5 Metal Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Table of Contents
Mueller Compact Chiller, Models CP2-10 and CP2-20 Effective December 21, 2011
Installation and Operation Manual, Part No. 8826880 Revised June 7, 2023

Table of Contents
Section 13.0 – Safety
13.1 General .....................................................................................................................26
13.2 Refrigerant Health Hazards ...............................................................................................26
13.3 First Aid ....................................................................................................................26
13.4 Safety Equipment..........................................................................................................26
Section 14.0 – Equipment Markings
14.1 Label No. 8820454, Dry Nitrogen Holding Charge .......................................................................27
14.2 Label No. 8829321, Chiller CE UKCA Data Tag...........................................................................27
14.3 Label No. 8829047, CE UKCA Data Tag ..................................................................................27
14.4 Label No. 8829330, Warning Symbol: Burn Hazard, Hot Surface ........................................................27
14.5 Label No. 8829324, Warning Symbol: Arc Flash..........................................................................28
14.6 Label No. 8826707, Solution Flow Arrow .................................................................................28
14.7 Label No. 8820677, Ground Symbol .......................................................................................28
14.8 Label No. 8826887, Primary Earth Ground ...............................................................................28
14.9 Label No. 8826916, Lift Point ..............................................................................................28
14.10 Label No. 9901403, Water/Solution In ....................................................................................28
14.11 Label No. 9901404, Chiller Water/Solution Out ..........................................................................28
14.12 Label No. 8829326, Read Operator Manual ...............................................................................29
14.13 Label No. 8829325, Lockout ...............................................................................................29
Section 15.0 – Manual Parameters Selection
15.1 Manual Parameters Selection Chart ......................................................................................30
Section 16.0 – Declarations
16.1 Declaration of Conformity.................................................................................................32
16.2 Declaration of Incorporation ..............................................................................................33
Section 17.0 – Wiring Schematic (Attached).........................................................................34
Mueller Compact Chiller, Models CP2-10 and CP2-20 Effective December 21, 2011
Installation and Operation Manual, Part No. 8826880 Revised June 7, 2023

Mueller Compact Chiller, Models CP2-10 and CP2-20 Effective December 21, 2011
Installation and Operation Manual, Part No. 8826880 Revised June 7, 2023
1
1.1 GENERAL INFORMATION
Mueller® CP2-10 and CP2-20 compact chillers are designed to provide the efficient production of a chilled liquid
cooling solution while requiring minimal installation time and maintenance.
1.2 TECHNICAL SUPPORT
This manual provides the basic installation and operating information for Mueller CP2-10 and CP2-20 compact
chillers. Please contact your local Paul Mueller Company Sales and Service Representative if you require additional
technical assistance pertaining to installation or operating procedures.
IMPORTANT: The information in this manual must be followed closely to prevent equipment damage.
Manufacturer’s support is available by contacting the following:
Paul Mueller Company
Noordgang 14
7141 JP Groenlo
The Netherlands
Main Telephone: [phone]
Service Telephone: [phone]
Email: [e-mail]
1.3 SAFETY STATEMENT
Electrical and refrigeration installation and service must be performed by an authorized service technician who
has the proper training to install and service refrigeration and electrical equipment.
Local, state, and/or country electrical and refrigeration regulations must be followed during installation, service,
and/or operation of this equipment.
SAFETY ALERT: It is imperative to fully read and understand the instructions in this manual prior to
installation or operation of the equipment to prevent unnecessary injury or equipment damage.
1.4 INTENDED USE OF EQUIPMENT
Mueller CP2-10 and CP2-20 compact chillers are designed to be incorporated with a Mueller Accu-Therm® plate
cooler and Mueller E-Star® HiPerForm® “HPF/ESE” or E-Star direct expansion “OESE” condensing unit of
sufficient size to complete a complex assembly for cooling milk.
1.5 MISUSE OF EQUIPMENT
SAFETY ALERT: Any misuse of Mueller compact chillers may result in damage to the unit and/or
injury to personnel. Do not allow objects to be placed on or around the chiller that block access.
Section 1.0 – Introduction
!
!

Mueller Compact Chiller, Models CP2-10 and CP2-20 Effective December 21, 2011
Installation and Operation Manual, Part No. 8826880 Revised June 7, 2023
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2.1 EQUIPMENT COMPONENTS
A. System Features:
• One 340-liter (90-gallon) insulated reservoir
• One 3-horsepower circulator pump
• Two flow switches
• Two evaporator heat exchangers for two 5-horsepower or two 10-horsepower units
• One control cabinet with temperature controls, circulator pump contactor, and ON/OFF switch
B. System Component Requirements:
• One Mueller CP2 compact chiller
• Two 5-horsepower Mueller E-Star HiPerForm “HPF/ESE” condensing units
• Refrigerant piping
• One Mueller Accu-Therm plate cooler
FIGURE 1: COMPACT CHILLER COOLING SYSTEM
1. Mueller E-Star HiPerForm “HPF/ESE” condensing units for chiller.
2. Cold chiller water to the Mueller Accu-Therm plate cooler.
3. Return water to the Mueller compact chiller.
4. Warm milk to be cooled.
5. Cooled milk to the Mueller milk cooler storage tank.
Section 2.0 – Description of the Equipment
1
Mueller® Compact ChillerMueller Accu-Therm® Mueller Milk Cooler
5
2
3
4

Mueller Compact Chiller, Models CP2-10 and CP2-20 Effective December 21, 2011
Installation and Operation Manual, Part No. 8826880 Revised June 7, 2023
3
FIGURE 2: COMPACT CHILLER PIPING SCHEMATIC
FIGURE 3: COMPACT CHILLER COOLING SYSTEM DIMENSIONS AND WEIGHTS
Chilled
Water Ou
t
Flow Switch Flow Switch
Chilled Water Return
Glycol Reservoir
Circulation Pump
Re
frigerant
In
Refrigerant
Out
Evaporator 1 Evaporator 2
Refrigerant
In
Refrigerant
Out
54
"
52"
31
"
Length 132 cm 52 in
Width 79 cm 31 in
Height 138 cm 54 in
Approximate
Weight
CP2-10 352 kg 775 lb
CP2-20 383 kg 845 lb

Mueller Compact Chiller, Models CP2-10 and CP2-20 Effective December 21, 2011
Installation and Operation Manual, Part No. 8826880 Revised June 7, 2023
4
2.2 REFRIGERATION COMPONENTS
Mueller CP2 compact chillers are designed to operate with two Mueller 5-horsepower E-Star HiPerForm “HPF/
ESE” condensing units for maximum performance and efficiency. Refer to the E-Star HiPerForm “HPF/ESE”
condensing unit manuals for technical information.
2.3 EVAPORATOR
The Mueller compact chiller uses two totally enclosed, heavy-duty, stainless steel evaporators to provide years
of trouble-free operation when properly installed and controlled. However, like any low-temperature chiller
evaporator, the compact chiller may be susceptible to damage not covered by the warranty if the chilled liquid
solution is allowed to freeze.
Mueller compact chillers are not designed to operate at chilled solution temperatures below 1.11°C without
properly protecting the system with a 20% (–7.5°C) to 25% (–10°C) mixture of Dowfrost propylene glycol. If a
propylene glycol other than Dowfrost is used, the mix ratio must achieve a –9°C freeze point.
IMPORTANT: The circulation of a controlled warm water or a completely drained evaporator is
mandatory during pump down or refrigerant recovery to eliminate evaporator damage due to freezing.
2.4 LIQUID SOLUTION FLOW COMPONENTS
• A 3-horsepower centrifugal pump circulates chilled solution from the reservoir, through the evaporator heat
exchangers and remote Accu-Therm plate cooler, and back to the reservoir.
• The chilled-liquid circulation system incorporates a threaded suction screen, located internally in the
reservoir at the suction connection. This screen prevents particulate matter from entering the circulation
pump, evaporator heat exchangers, and Accu-Therm plate cooler. Remove the screen and clean as needed.
• Isolation valves are provided in the liquid solution lines for servicing the pump.
• The system has two liquid solution flow switches that utilize normally open (NO) contacts connected in series
to the chiller control. In the event of a pump failure, flow blockage, or loss of liquid solution, the paddle in one
of the flow switches will open and de-energize both of the condensing units, indicating a flow restriction. The
condensing units will re-energize when the switch is closed again, indicating adequate fluid flow.
IMPORTANT: If an event indicating a flow restriction occurs, a service technician should be contacted
to troubleshoot and repair the cause prior to multiple restarts.
IMPORTANT: The above condition could be caused by improper temperature settings in the electronic
temperature control. Multiple restarts prior to repair or adjustment could cause failure of an
evaporator due to expansion from freezing, not covered by the warranty.
• The 340-liter insulated reservoir is constructed of polyethylene. The cover should remain on the reservoir at
all times to prevent particulate and contaminants from entering the liquid solution.

Mueller Compact Chiller, Models CP2-10 and CP2-20 Effective December 21, 2011
Installation and Operation Manual, Part No. 8826880 Revised June 7, 2023
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2.5 ELECTRICAL COMPONENTS
The Mueller compact chiller has a complete electrical control system. The electronic temperature control is
housed in a separate enclosure. The multi-stage chiller control must be mounted and wired to the flow switches,
condensing units, temperature sensors, and pump. All wiring must be performed in accordance with the regulatory
agency for the installation locality.
IMPORTANT: Do not expose the electrical control enclosure to ambient temperatures above 60°C or
below 0°C.
TABLE 1: ELECTRICAL SPECIFICATIONS
2.7 CONTROL OPERATION
See Section 7 for control operation.
Pump Horsepower Part No. Voltage FLA MCA MOPD
3 8828761 230/1/60 14.5 18.1 30
3 8828763 230/3/60 10 12.5 20
2 8828762 380/3/50 5 6.3 10
3 8828763 460/3/60 5 6.3 10
3 8829008 575/3/60 5 6.3 10

Mueller Compact Chiller, Models CP2-10 and CP2-20 Effective December 21, 2011
Installation and Operation Manual, Part No. 8826880 Revised June 7, 2023
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3.1 INSPECTION
Because it is possible for equipment damage to occur during shipment, Paul Mueller Company requires inspecting
all equipment before unloading it from the freight truck. Carefully inspect the equipment for hidden damage. It may
be difficult to collect for damage if it is not found prior to unloading. It is important to note any damage on the bill of
lading and have the driver sign it.
3.2 HANDLING
IMPORTANT: Equipment used to move or lift this equipment must be rated for the weight of the
equipment. See Figure 3 for equipment weight.
3.3 UNLOADING THE COMPACT CHILLER
Use qualified personnel and equipment when unloading the chiller. See Figure 4 for lifting the crated chiller.
1. Spread the forks to the maximum width to fit under the skid for equal balance.
2. Insert the forks fully under the skid and raise the unit from the carrier. Slightly tips forks toward forklift to
prevent the unit from sliding off.
3. Move the crated chiller near the installation area and place on the floor.
IMPORTANT: If the compact chiller is being moved to a warehouse for storage, do not stack more than
one unit high and do not stack any objects on the crate.
4. Remove the upper wood shipping crate and inspect the compact chiller for damage. Report any damage to the
carrier immediately.
3.4 SKID REMOVAL
1. Remove the wood cross braces securing the unit to the skid.
2. Utilizing qualified personnel and equipment, locate the lift points from the side of the unit. See Figure 5.
3. Spread the forks to match the lift points and insert the forks between the wood skid and the base of the unit.
Fully insert the forks to engage both sides of the base.
4. Carefully lift the unit out of the skid and place the unit in the final installation location. Remove the forks.
3.5 ANCHORING THE COMPACT CHILLER
The chiller must be secured in place utilizing the anchor points marked on the compact chiller. See Figure 6.
Section 3.0 – Installation

Mueller Compact Chiller, Models CP2-10 and CP2-20 Effective December 21, 2011
Installation and Operation Manual, Part No. 8826880 Revised June 7, 2023
7
FIGURE 4: FORK LIFT CRATED
FIGURE 5: SKID REMOVAL

Mueller Compact Chiller, Models CP2-10 and CP2-20 Effective December 21, 2011
Installation and Operation Manual, Part No. 8826880 Revised June 7, 2023
8
FIGURE 6: CP2 COMPACT CHILLER ANCHOR POINTS
3.6 LOCATION
When choosing a location for the Mueller compact chiller, consider these items:
• Environment: An indoor location will be necessary where the chiller is protected from freezing
temperatures.
• Serviceability: The chiller should be located with the circulating pump and the electronic temperature
control accessible for service. Keep in mind the chiller will require field connections to the main electrical
supply and the liquid solution reservoir may require a drain for maintenance.
• Condensing Units: The condensing units must be located where they are protected from the environment
and have adequate air flow for the condensers. Be especially cautious for conditions that would allow dust or
oil to enter the condenser.
• Eciency: Locate the chiller as close as possible to the Mueller Accu-Therm plate cooler. This will improve
efficiency by reducing heat gain and flow restrictions in the chilled liquid solution piping.
3.7 CHILLED SOLUTION PIPING
The piping between the compact chiller and the Accu-Therm plate cooler should be a minimum of 3-inch
Schedule-40 or -80 PVC, stainless steel, or copper pipe. Make any reducer connections at the Accu-Therm plate
cooler, and install a union and shutoff valve in each line for service.
If PVC plastic pipe is used with solutions containing propylene glycol, the manufacturers of PVC or CPVC pipe
recommend that Schedule-80 purple primer and Schedule-80 gray adhesive be used. The following procedure
should be used to assemble PVC or CPVC:
1. Scour primer with a hard bristle brush. It should be alternately applied to the surface of the pipe once and to
the fitting socket twice.
2. Solvent cement should be applied with a stiff bristle brush while the primer is wet. It should be alternately
applied to the surface of the pipe twice and to the fitting socket once.
An
chor
Poi
nts

Mueller Compact Chiller, Models CP2-10 and CP2-20 Effective December 21, 2011
Installation and Operation Manual, Part No. 8826880 Revised June 7, 2023
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3.7 CHILLED SOLUTION PIPING (CONTINUED)
IMPORTANT: Galvanized pipe should not be used for applications with propylene glycol, as propylene
glycol can strip the zinc coating from galvanized pipe.
To provide efficient, chilled liquid solution flow to the Accu-Therm plate cooler, utilize long-radius fittings and 45°
elbows where possible. Install non-absorbent pipe insulation on both pipes to reduce sweating and heat gain of the
chilled liquid solution piping.
3.8 CONDENSING UNIT INSTALLATION
Refer to the E-Star HiPerForm “HPF/ESE” manuals for condensing unit installation information.
The condensing units, pre-assembled line sets, and compact chiller refrigeration circuits require a refrigeration
system evacuation to 500 microns prior to refrigerant charging. The system must hold below 1,000 microns in a
standing vacuum test, ensuring that it is leak free.
IMPORTANT: The circulation of controlled warm water or a completely drained evaporator is
mandatory during pump-down or refrigerant recovery to eliminate evaporator damage due to freezing.

Mueller Compact Chiller, Models CP2-10 and CP2-20 Effective December 21, 2011
Installation and Operation Manual, Part No. 8826880 Revised June 7, 2023
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4.1 FIRST TIME STARTUP
IMPORTANT: Clean the system before filling the reservoir to retard the growth of algae and bacteria in
the chilled liquid solution.
4.2 LEAK TESTING PROCEDURE
1. Remove all dirt, paper, and other debris that accumulated during shipment and installation.
2. Fill the reservoir with 114–190 liters (30–50 gallons) of cold water and operate the circulating pump with the
condensing units turned off. Check all liquid solution piping and components for leaks.
3. After confirming the system has no leaks, drain the reservoir and proceed with the outlined cleaning
procedure.
4.3 CLEANING PROCEDURE
1. Fill the reservoir with a mixture of about 170 liters (45 gallons) of 71°C (160°F) water and 3.6 kg (8 pounds) of
trisodium phosphate.
2. Operate the circulating pump for 15 minutes with the condensing units off. During this time, brush the inside
of the reservoir to clean the areas that are not submerged.
3. Drain the wash solution and fill the reservoir with 114–190 liters (30–50 gallons) of lukewarm rinse water.
4. Operate the circulating pump for 10 minutes while manually rinsing the reservoir walls that are not
submerged. Drain the rinse water completely.
4.4 FILLING THE RESERVOIR
Fill the reservoir to within three inches of the top with deionized water. Do not use softened water from a standard
water softener as there is an increased possibility of chloride corrosion to the stainless steel evaporator or the
Accu-Therm plate cooler.
IMPORTANT: Never use chlorine as a bacteria inhibitor or cleaning agent as it will cause premature
failure of the evaporator and plates within the remote, secondary plate cooler. A food-grade inhibitor,
methylparaben, Part No. 9841027, is available from Paul Mueller Company.
The water quality must meet the following standards:
• Chlorides: 25 ppm maximum
• Sulfates: 25 ppm maximum
• Calcium: 50 ppm maximum
• Magnesium: 50 ppm maximum
• Total Hardness: 100 ppm maximum
Section 4.0 – Cleaning the System

Mueller Compact Chiller, Models CP2-10 and CP2-20 Effective December 21, 2011
Installation and Operation Manual, Part No. 8826880 Revised June 7, 2023
11
4.5 LIQUID SOLUTION FOR INSTANT COOLING
IMPORTANT: If the system will be used for instant cooling and operated at a liquid solution
temperature at or below 1.11°C (34°F), the liquid solution must be protected with an approved propylene
glycol to prevent failure of the evaporator by freezing. The propylene glycol liquid solution must be
concentrated to obtain a minimum of –8.3°C (17°F) freeze point.
Paul Mueller Company recommends Dowfrost™ propylene glycol, manufactured by Dow Chemical Company.
Table 1 provides freeze points of Dowfrost solutions at specific concentration percentages. Please contact the
Mueller Service Department for assistance in locating a local Dow Chemical dealer.
TABLE 2: TYPICAL FREEZING POINTS OF AQUEOUS SOLUTION OF DOWFROST
IMPORTANT: A refractometer designed for testing the freeze point of propylene glycol solutions should
be used to determine the actual freeze point of the solution. Please contact Paul Mueller Company’s
Service Department for assistance in locating a supplier of propylene glycol refractometers.
Volume % Dowfrost Freezing Point °F (°C)
0.0 32.0 (0.0)
5.0 29.1 (–1.6)
10.0 26.1 (–3.3)
15.1 22.9 (–5.1)
20.3 19.2 (–7.1)
21.3 18.3 (–7.6)
22.4 17.6 (–8.0)
23.4 16.6 (–8.6)
24.5 15.6 (–9.1)
25.5 14.7 (–9.6)
26.5 13.7 (–10.2)
27.6 12.6 (–10.8)
28.6 11.5 (–11.4)
29.7 10.4 (–12.0)
30.7 9.2 (–12.7)

Mueller Compact Chiller, Models CP2-10 and CP2-20 Effective December 21, 2011
Installation and Operation Manual, Part No. 8826880 Revised June 7, 2023
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5.1 SYSTEM EVACUATION
With refrigerant piping completed and leak tested, the equipment is ready to evacuate. A quality vacuum pump
capable of a 500-micron vacuum is necessary for adequate and dependable system evacuation. Moisture in a
refrigeration system can cause corrosion, expansion valve freeze-up, and oil sludge.
Attach the vacuum pump to both the high- and low-side of the system through the compressor service valves and
evacuate to 500 microns. (All service valves, hand valves, and solenoids must be open during the evacuation.)
NOTE: Service valves are back-seating valves and must be in mid-position to open both sides of the system to the
evacuation pump.
IMPORTANT: As a final leak test, close the valve to the vacuum pump and ensure the vacuum is
maintained below 1,000 microns for five minutes.
5.2 SYSTEM CHARGING (ALSO REFER TO CONDENSING UNIT MANUAL)
With the system wired, plumbed, and evacuated, the unit is ready to charge with the appropriate refrigerant.
All charging lines and manifolds must be evacuated prior to admitting refrigerant into the system to prevent
contaminating the system with non-condensables.
1. Place the rotary switch in the pump position and ensure liquid solution circulation through the brazed-plate
evaporators. Admit liquid refrigerant into the evacuated system until low- and high-side pressure is above the
freeze point of the liquid solution or 0°C (32°F).
2. With the charging line connected to the receiver service valve, admit liquid refrigerant into the high side of the
system until the flow stops, due to pressure equalization between the high side and the refrigerant drum. Back
seat the service valve, close the manifold valve, and disconnect the charging line.
3. Energize the equipment and continue to admit liquid into the low side of the system until the liquid line sight
glass clears, indicating a fully charged system. It may be necessary to bypass the low-pressure control on the
initial start to prevent nuisance trips until the low-side pressure is above the cut-out point of control.
NOTE: If utilizing an E-Star HiPerForm condensing unit, liquid may be charged upstream of the accumulator heat
exchanger. Refer to the E-Star condensing unit manual for more detailed charging instructions.
5.3 SYSTEM STARTUP
This is a continuation of system charging and must be performed before the equipment can be left operating and
unattended, and involves checking and adjusting all safety and operating controls. Do not attempt to function safety
controls without some means of stopping the compressor in the event of extreme high or low-pressure conditions
that could damage the equipment. If the controls fail to function at setpoints, determine the cause and correct.
SAFETY ALERT: Bypassing any safety control step, other than for testing purposes, is dangerous to
personnel and equipment and nullifies the equipment warranty.
NOTE: Energize crankcase heaters and allow a minimum of four hours of operation before a compressor startup.
Ensure all service valves are open to avoid over-pressurization of system components.
Section 5.0 – Evacuation, Charging, and Startup of System
!

Mueller Compact Chiller, Models CP2-10 and CP2-20 Effective December 21, 2011
Installation and Operation Manual, Part No. 8826880 Revised June 7, 2023
13
5.4 HIGH-PRESSURE CONTROL
To test the high-pressure control, connect a gauge to the compressor discharge service valve and disable the
condenser fan(s) or water regulating valve(s). The control should open immediately when the discharge pressure
reaches control setpoint. Enable the condenser fans or water regulating valve(s) and reset the pressure control.
Refer to the specific condensing unit manual.
5.5 LOW-PRESSURE CONTROL
Ensure the solution temperature is above 10°C (50°F) to prevent damage to the evaporator by freezing. To test the
low-pressure control, connect a gauge to the compressor suction service valve. Throttle the receiver outlet valve
to lower the suction pressure at the compressor. The system should pump down and the compressor de-energize
when the suction pressure reaches the cut-out setting of control. Open the receiver outlet valve and observe the rise
in pressure at the compressor suction connections. Reset the low-pressure control and the compressor should re-
energize when the pressure reaches the cut-in setting of control. Refer to the specific condensing unit manual.
IMPORTANT: Controlled warm water circulation must be maintained through the evaporator to
prevent damage caused by freezing when testing the low-pressure switch.
5.6 THERMAL EXPANSION VALVE
Adjust the superheat setting to 5.6–6.7°C (10–12°F). To determine superheat correctly:
1. With an accurate set of manifold gauges, measure the suction pressure at the evaporator outlet.
2. Convert the suction pressure to a saturation temperature using a refrigerant pressure temperature table.
3. With an accurate thermometer, measure the temperature of the suction gas at the expansion valve’s remote
bulb location.
4. Subtract the saturation temperature read from the refrigerant pressure temperature table in step 2 from the
temperature measured in step 3. The difference is the superheat of suction gas.
5.7 TEMPERATURE CONTROL CALIBRATION ACCURACY
Once the installation wiring is completed for the chiller control box, check the calibration accuracy of the
temperature control as outlined below:
1. Allow the product temperature to stabilize for a minimum of 15 minutes.
2. Using an accurate electronic thermometer, determine the actual temperature of the solution.
3. If the known product temperature does not correspond with the temperature display, the temperature control
will require a calibration correction. Refer to Section 9 for sensor calibration.

Mueller Compact Chiller, Models CP2-10 and CP2-20 Effective December 21, 2011
Installation and Operation Manual, Part No. 8826880 Revised June 7, 2023
14
6.1 SOUND TESTING EQUIPMENT
The compact chiller’s sound level test was performed under normal operating conditions with the circulation pump
operating. Measurements were performed by a third party.
6.2 SOUND MEASUREMENT
Maximum recorded noise levels for this machine were recorded at less than 70 dB(A).
Section 6.0 – Equipment Sound Level