Mueller CP2-10 User manual

Part No. 8826238
Effective May 15, 2009
Revised January 31, 2019
Compact Chiller
Models CP2-10 a d CP2-20
INS ALLA ION AND OPERA ION MANUAL

Sectio 1.0 – I troductio
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
Sectio 2.0 – Descriptio of the Equipme t
2.1 Equipment Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Figure 1: Compact Chiller Cooling System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Figure 2: Compact Chiller Cooling System Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
2.2 Refrigeration Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
2.3 Evaporator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
2.4 Liquid Solution Flow Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
2.5 Electrical Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
2.6 Control Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Sectio 3.0 – I stallatio
3.1 Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
3.2 Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
3.3 Chilled Solution Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
3.5 Condensing Unit Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Table 1: E-Star HiPerForm Refrigerant Charge (CP2-10 Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
3.6 Condensing Unit Expansion Valve Sizing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Table of Co te ts
Compact Chiller
Models CP2-10 a d CP2-20
INS ALLA ION AND OPERA ION MANUAL
Mueller Compact Chiller Models CP2-10 and CP2-20 Effective May 15, 2009
Installation and Operation Manual, Part No. 8826238 Revised January 31, 2019

Table of Co te ts
Sectio 4.0 – Clea i g the System
4.1 First Time Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
4.2 Leak Testing Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
4.3 Cleaning Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
4.4 Filling the Reservoir . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
4.5 Liquid Solution for Instant Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Table 2: Typical Freezing Points of Aqueous Solution of Dowfrost™ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Sectio 5.0 – Evacuatio , Chargi g, a d Start-Up of System
5.1 System Evacuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
5.2 System Charging (Also Refer to Condensing Unit Manual) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
5.3 System Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
5.4 Temperature Control Calibration Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Mueller Compact Chiller Models CP2-10 and CP2-20 Effective May 15, 2009
Installation and Operation Manual, Part No. 8826238 Revised January 31, 2019

Mueller Compact Chiller Models CP2-10 and CP2-20 Effective May 15, 2009
Installation and Operation Manual, Part No. 8826238 Revised January 31, 2019
1.1 GENERAL
Mueller® compact chillers are designed to provide the efficient production of a chilled liquid cooling solution while
requiring minimal installation time and maintenance.
1.2 ECHNICAL SUPPOR
This manual provides the basic installation and operating information for a Mueller compact chiller. 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 i formatio i this ma ual must be followed closely to preve t equipme t damage.
Manufacturer’s support is available by contacting the following:
Paul Mueller Compa y
Dairy Farm Equipment Service Department
1600 West Phelps Street
Springfield, Missouri 65802
Direct Telephone: [phone]
Facsimile: 1-800-436-2466
Email: [e-mail]
1.3 SAFE Y S A EMEN
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.
1.4 IN ENDED USE OF EQUIPMEN
The Mueller compact chiller is designed to be incorporated with a Mueller Accu-Therm® plate cooler and Mueller
E-Star® HiPerForm® condensing unit of sufficient size to complete a complex assembly for cooling milk.
1.5 MISUSE OF EQUIPMEN
IMPORTANT: A y misuse of the Mueller compact chiller may result i damage to the u it a d/or
perso el. Do ot allow objects to be placed o or arou d the chiller that block access.
Sectio 1.0 – I troductio

Mueller Compact Chiller Models CP2-10 and CP2-20 Effective May 15, 2009
Installation and Operation Manual, Part No. 8826238 Revised January 31, 2019
2.1 EQUIPMEN COMPONEN S
A. System Features
• One (1) 90-gallon insulated reservoir
• One (1) 3 hp circulator pump
• One flow switch
• Two (2) evaporator heat exchangers for two (2) 5 hp or two (2) 9 hp condensing units
• A control cabinet with temperature controls, circulator pump contactor, and ON/OFF switch
B. System Component Requirements
• One (1) Mueller CP2 compact chiller
• Two (2) 5 hp or 3.5 hp Mueller E-Star HiPerForm “OHSE” or “OESE” condensing units
– or –
• Two (2) 9 hp Mueller E-Star HiPerForm “OHSE” or “OESE” condensing units
• Refrigerant piping
• One (1) Mueller Accu-Therm plate cooler
FIGURE 1: COMPAC CHILLER COOLING SYS EM
1 - Mueller E-Star HiPerForm “OHSE” 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.
2
Sectio 2.0 – Descriptio of the Equipme t
1
Mueller® Compact Chiller Mueller Accu-Therm® Mueller Milk Cooler
5
2
3
4

Mueller Compact Chiller Models CP2-10 and CP2-20 Effective May 15, 2009
Installation and Operation Manual, Part No. 8826238 Revised January 31, 2019
FIGURE 2: COMPAC CHILLER COOLING SYS EM DIMENSIONS
2.2 REFRIGERA ION COMPONEN S
The Mueller CP2-10 compact chiller is designed to operate with two Mueller 3.5 or 5 hp E-Star HiPerForm “OHSE”
condensing units for maximum performance and efficiency or two 5 hp E-Star “OESE” thermal expansion valve
condensing units. The Mueller CP2-20 compact chiller is designed to operate with two Mueller 9 hp E-Star
HiPerForm “OHSE” condensing units for maximum performance and efficiency or two 9 HP E-Star “OESE”
thermal expansion valve condensing units. Refer to the respective E-Star HiPerForm “OHSE” or “OESE”
condensing unit manual for technical information.
2.3 EVAPORA OR
The Mueller compact chiller uses two totally enclosed, heavy-duty stainless steel evaporators that will provide
years of trouble-free operation when properly installed and controlled; however, like any low temperature chiller
evaporator, may be susceptible to non-warranted damage if the chilled liquid solution is allowed to freeze.
The Mueller compact chiller is not designed to operate at chilled solution temperatures below 34°F without
properly protecting the system with a 20% (18.5°F) to 25% (14°F) mixture of Dowfrost propylene glycol. If a
propylene glycol other than Dowfrost is used, the mix ratio must achieve a 15°F freeze point.
NOTE: Contact the Mueller Dairy Farm Equipment Service Department prior to making any temperature setpoint
ad ustments below 34°F.
IMPORTANT: The circulatio of a co trolled warm water or a completely drai ed evaporator is
ma datory duri g pump dow or refrigera t recovery to elimi ate evaporator damage due to freezi g.
3
54"
52"
31"

Mueller Compact Chiller Models CP2-10 and CP2-20 Effective May 15, 2009
Installation and Operation Manual, Part No. 8826238 Revised January 31, 2019
2.4 LIQUID SOLU ION FLOW COMPONEN S
A 3 hp centrifugal pump circulates the 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 will prevent particulate matter from entering the circulation pump, evaporator heat
exchanger, and Accu-Therm plate cooler. It should be removed and cleaned as necessary.
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 (N.O.) 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 condensing units. In the event that one of the flow switches breaks
the control circuit and de-energizes the condensing units, the units will re-energize when the switch is closed
again, indicating adequate fluid flow.
This condition indicates that there was a flow restriction and a service technician should be contacted to
troubleshoot and repair the cause prior to multiple restarts.
IMPORTANT: The above co ditio could be caused by improper temperature setti gs of the electro ic
temperature co trol. Multiple restarts prior to repair or adjustme t could cause a o -warra ted failure
of a evaporator due to expa sio from freezi g.
The 90-gallon 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.
2.5 ELEC RICAL COMPONEN S
The Mueller compact chiller comes with 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.
The power supply must be connected to a 240 volt, 60 hertz, single-phase fused disconnect, fused at a maximum of
20 amps.
IMPORTANT: Do ot expose the electrical co trol e closure to ambie ts above 140°F or below 32°F.
All wiring must be performed in accordance with the National Electric Code (NEC) or regulatory agency for the
installation locality.
2.6 CON ROL OPERA ION
See the Mueller multi-stage chiller control manual (Part No. 8825582) for control operation.
4

Mueller Compact Chiller Models CP2-10 and CP2-20 Effective May 15, 2009
Installation and Operation Manual, Part No. 8826238 Revised January 31, 2019
3.1 INSPEC ION
Due to the possibility of equipment damage during shipment, it is recommended that you make a thorough
inspection of all equipment before it is unloaded from the freight carrier. Carefully inspect equipment for hidden
damage. It may be difficult to collect for damage if it is not found prior to unloading. If any damage is found, it is
very important to note the damage on the bill of lading and have the driver sign the bill of lading.
3.2 LOCA ION
When choosing a location for the Mueller compact chiller, consider these items:
•E viro me t: 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.
•Co de si g U its: 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.
•Efficie cy: Locate the chiller as close to the Mueller Accu-Therm plate cooler as possible. This will improve
efficiency by reducing heat gain and flow restrictions in the chilled liquid solution piping.
3.3 CHILLED SOLU ION PIPING
The piping between the Mueller compact chiller and the Mueller Accu-Therm plate cooler should be a minimum of
3" Schedule-40 or -80 PVC, stainless steel, or copper pipe. Make any reducer connections at the Accu-Therm and
install a union and shut-off 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.
IMPORTANT: Galva ized pipe should ot be used for applicatio s with propyle e glycol, as propyle e
glycol ca strip the zi c coati g from galva ized pipe.
To provide efficient, chilled liquid solution flow to the Accu-Therm plate cooler, utilize long-radius fittings and 45-
degree elbows where possible. A non-absorbent pipe insulation should be installed on both pipes to reduce
sweating and heat gain of the chilled liquid solution piping.
5
Sectio 3.0 – I stallatio

Mueller Compact Chiller Models CP2-10 and CP2-20 Effective May 15, 2009
Installation and Operation Manual, Part No. 8826238 Revised January 31, 2019
3.5 CONDENSING UNI INS ALLA ION
Refer to the Mueller E-Star HiPerForm “OHSE” or “OESE” condensing unit manual for installation information.
The condensing units, pre-assembled line sets, and compact chiller refrigeration circuit will require a triple
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.
Mueller E-Star HiPerForm condensing units require a refrigerant charge correction for use with the Mueller
compact chiller. Table 1, “E-Star HiPerForm Refrigerant Charge,” should be followed. The table displays only a
startup refrigerant charge. Normal refrigeration unit startup procedures, located in the condensing unit manual,
should be followed when ad usting to final operating charge. Refer to the respective E-Star HiPerForm “OHSE” or
“OESE” condensing unit manual for technical information.
ABLE 1: E-S AR HIPERFORM REFRIGERAN CHARGE (CP2-10 ONLY)
IMPORTANT: The circulatio of co trolled warm water or a completely drai ed evaporator is ma datory
duri g pump dow or refrigera t recovery to elimi ate evaporator damage due to freezi g.
3.6 CONDENSING UNI EXPANSION VALVE SIZING
6
U it Size Part No. R-507
5 hp 9843711 Y573-SPE-4-PC
10 hp 8825850 EBSPE-7.5-PC
U it Size R-507 Refrigera t Charge
3.5 hp 12.0 lbs
10 hp 13.0 lbs

Mueller Compact Chiller Models CP2-10 and CP2-20 Effective May 15, 2009
Installation and Operation Manual, Part No. 8826238 Revised January 31, 2019
4.1 FIRS IME S AR -UP
IMPORTANT: Clea the system before filli g the reservoir to retard the growth of algae a d bacteria i
the chilled liquid solutio .
4.2 LEAK ES ING PROCEDURE
1. Remove all dirt, paper, and other debris that accumulated during shipment and installation.
2. Fill the reservoir with 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 there are 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 45 gallons of 160°F water and 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 with 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 HE 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 Accu-
Therm plate cooler.
Never use chlorine as a bacteria inhibitor or cleaning agent as it will cause premature failure of the evaporator and
plates within the Accu-Therm plate cooler. A food-grade inhibitor, methylparaben, Part No. 9840964, is available
through 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
PROHIBITION: Never use chlori e as a bacteria i hibitor or clea i g age t, as it will cause premature
failure of the evaporator a d plates withi the remote, seco dary plate cooler.
7
Sectio 4.0 – Clea i g the System

Mueller Compact Chiller Models CP2-10 and CP2-20 Effective May 15, 2009
Installation and Operation Manual, Part No. 8826238 Revised January 31, 2019
4.5 LIQUID SOLU ION FOR INS AN COOLING
IMPORTANT: If the system is to be used for i sta t cooli g a d operated at a liquid solutio temperature
at or below 34°F, the liquid solutio must be protected with a approved propyle e glycol to preve t
failure of the evaporator by freezi g. The propyle e glycol liquid solutio must be co ce trated to obtai
a mi imum of 17°F freeze poi t.
Paul Mueller Company recommends Dowfrost™ propylene glycol, manufactured by Dow Chemical Company.
Table 2 provides freeze points of Dowfrost solutions at specific concentration percentages. Please contact the
Mueller Dairy Farm Equipment Service Department for assistance in locating a local Dow Chemical dealer.
ABLE 2: YPICAL FREEZING POIN S OF AQUEOUS SOLU ION OF DOWFROS
IMPORTANT: A refractometer desig ed for testi g the freeze poi t of propyle e glycol solutio s should
be used to determi e the actual freeze poi t of the solutio . Please co tact the Mueller Dairy Farm
Equipme t Service Departme t for assista ce i locati g a supplier of propyle e glycol refractometers.
8
Volume % Dowfrost Freezi g Poi t °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 May 15, 2009
Installation and Operation Manual, Part No. 8826238 Revised January 31, 2019
5.1 SYS EM EVACUA ION
With refrigerant piping completed and leak tested, equipment is ready to evacuate. A quality vacuum pump capable
of 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 vacuum pump to both high and low side of system through compressor service valves and evacuate to 500
microns. (All service valves, hand valves, and solenoids must be open during 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 fi al leak test, close the valve to the vacuum pump a d e sure vacuum is mai tai ed
below 1,000 micro s for five mi utes.
5.2 SYS EM CHARGING (ALSO REFER O CONDENSING UNI 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-condensable.
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 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 high side and the refrigerant drum. Back seat
service valve, close manifold valve, and disconnect charging line.
3. Energize equipment and continue to admit liquid into the low side of system until the liquid line sight glass
clears, indicating a fully charged system (it may be necessary to bypass the low pressure control on initial start
to prevent nuisance trips until low side pressure is above cut-out point of control).
NOTE: If utilizing a Mueller E-Star HiPerForm condensing unit, liquid may be charged upstream of the
accumulator/heat exchanger. Refer to E-Star condensing unit manual for more detailed charging instructions.
5.3 SYS EM S AR -UP
This is a continuation of system charging and must be performed before equipment can be left operating and
unattended. This will involve checking and ad usting all safety and operating controls. Do not attempt to function
safety controls without some means of stopping compressor in the event of extreme high or low pressure
conditions that could damage the equipment. If controls fail to function at setpoints, determine the cause and
correct.
CAUTION: Bypassi g a y safety co trol step, other tha for testi g purposes, is da gerous to perso el
a d equipme t a d ullifies equipme t warra ty.
NOTE: Energize crankcase heaters and allow a minimum of four hours of operation before a compressor start-up.
9
Sectio 5.0 – Evacuatio , Chargi g, a d Start-Up of System
!

Mueller Compact Chiller Models CP2-10 and CP2-20 Effective May 15, 2009
Installation and Operation Manual, Part No. 8826238 Revised January 31, 2019
5.3 SYS EM S AR -UP (CON INUED)
A. High Pressure Control
To test the high pressure control, connect a gauge to the compressor discharge service valve and disable condenser
fan(s) or water regulating valve(s). Control should open immediately when discharge pressure reaches control
setpoint. Enable condenser fans or water regulating valve(s) and reset pressure control. Refer to the specific
condensing unit manual.
B. Low Pressure Control
Ensure solution temperature is above 10°C (50°F) to prevent damage to evaporator by freezing. To test the low
pressure control, connect a gauge to the compressor suction service valve. Throttle receiver outlet valve to lower
suction pressure at compressor. The system should pump down and the compressor de-energize when suction
pressure reaches the cut-out setting of control. Open receiver outlet valve and observe rise in pressure at
compressor suction connections. Reset the low pressure control and the compressor should re-energize when
pressure reaches cut-in setting of control. Refer to the specific condensing unit manual.
IMPORTANT: Co trolled warm water circulatio must be mai tai ed through the evaporator to preve t
damage caused by freezi g whe testi g the low pressure switch.
C. Thermal Expansion Valve
Ad ust superheat setting to 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 tables in step 2 from the temperature measured in step 3.
The difference is the superheat of suction gas.
5.4 EMPERA URE CON ROL CALIBRA ION 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 the multi-stage chiller control manual for sensor calibration.
0

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