Cornelius 322 User's Manual
Contents
1. D 15 Water O D 13 Dump Valve RH Evap Switch YL D 14 Contactor SB PE 50 O 6 Water LH Evap Switch xt Yb io xe Pump 30 04 D 12 502 SS Condenser Sensor GR HolGas 1 Condenser D 11 White plug 230v Suction Line Sensor Options Plug Bown l auchon plug Fan Voltage neutral x D 6 Selector Sleeve Connector Test Switch 115v N Plug GR O D 5 O Som Error ptions z o Plug Adjustable Ice O Thickness Pot Transformer Dump Dump Dump Dump Every Every Every Every Cycle 3rd 5th 7th Micro Processor Cycle Cycle Cycle Stacking Cable Plug M anual To Stacked Harvest Unit O Switch if re 166240008 14 3 17 95 ADJ USTING BRIDGE THICKNESS TOP ROW 38 5 8 DIMPLE J D CENTER 1 8 BRIDGE ide BOTTOM BRIDGE 1 81 0 32 For optimum ice production and maximum cube separation the ice connecting the individual cubes should be a minimum of 1 8 32cm thick at the center area of the ice waffle It is normal for the ice slab to be slightly thicker at the bottom and taper off in a slight wedge pattern at the top The top row of cubes must have a complete pattern of ice on all four sides and the back wall Remember when you operate the product with the panels off duri2. O MANIFOLD SET 2 OPEN Tras OPEN penny CLOSED OPEN HIGH SIDE I H SERVICE VALVE HIGH SIDE SERVICE VALVE LOW SIDE SERVICE D LOW SIDE VALVE SERVICE VALVE CLOSED OPEN CHARGING CHARGING CYLINDER CYLINDER TI CLOSED hed VACUUM VACUUM PUMP PUMP VA CLOSED T ELECTRONIC ELECTRONIC SCALE IMPORTANT Service personnel are held responsible for ALL ASPECTS OF THE CLEAN AIR ACT OF J ULY 1992 REFRIGERANT DEFINITIONS ASHRAE 3 1990 RECOVERY To remove refrigerant in any condition from a system and store it in an external container without necessarily testing or processing it in any way RECYCLING To clean refrigerant for reuse by oil separation and single or multiple passes through devices such as replace able core filter driers which reduce moisture acidity and particulate matter This term usually applies to proce dures implemented at the field job site or at a local service shop RECLAIM To reprocess refrigerant to new product specifications by means which may include distillation Will require chemical analysis of the refrigerant to determine that appropriate product specifications are met This term usu ally implies the use of processes or procedures available only at a reprocessing or manufacturing facility NOTES REGARDING RECLAIM New product specifications currently means ARI standard 700 88 Note that c
3. 7 Condenser Sensor white leads self contained air cooled only water cooled and remote systems use a resistor plug on the control board Complete the sensor and multimeter connections as described in 2 B C D 8 Shorted sensor a steady low milli volt reading will be recorded The reading will not change 9 Open sensor the multimeter will record control board output voltage of 2 5 VDC 10 Should sensor thermistor pass the voltage test proceed to the control board diagnosis for LED sequence see page 18 NOTE The sensor controls the condenser fan cycling from 88 100 degree Fahrenheit Thus any de fects in the condenser circuit will effect the fan cycling rate THERMOSTATIC EXPANSION VALVES The following suggestions for diagnosis of automatic Thermostatic Expansion Valve TXV are given with the understanding that the following have been checked and are correct and or have been corrected prior to pro ceeding 166240008 20 3 17 95 1 The condenser and fan blade are clean and have proper operating conditions Water supply to the product is correct and flow over the evaporator is correct Cuber refrigerant charge is correct TXV sensing bulb is properly located and secured to the suction line and correctly insulated uro cep Hot gas valve s are not leaking and or seeping through Starving TXV Product Symptoms 1 Suction pressure lower than normal for the operating conditions 2 Ice production lower than no
4. 166240008 18 3 17 95 COMPONENT FUNCTION TEST PLUG Board manufactures check point DO NOT ATTEMPT ANY VOLTAGE CHECKS AT THESE PINS SENSORS Condenser sensor white and suction line sensor brown are thermistors rated 1k ohm at room temperature Condenser sensor signals the circuit board for fan cycling and also serves as the high temperature safety shut down The red Error LED will flash on and off every second during high temperature safety shut down Product is functionally shut down Reset procedure must be performed to restart product operation Suction line sensor signals the circuit board the suction line temperature to control ice bridge thickness Also the sensor serves as Suction line high temperature signal Cuber has 6 minutes to reduce suction line temperature to 4006 4 40 in the freeze mode The red Error LED will be steady on Should this time frame not be met product is functionally inoperative during this safety shut down Reset procedure must be performed to restart product operation RESET OPERATION When Cuber is functionally shut down and red Error LED is operational the Cuber power switch must be turned off for 5 seconds and returned to the ON position to reset the circuit board and allow the Cuber to restart operation Evaporator Switches Proximity Switches are half mounted to the water curtain and the other half mounted to the evaporator side rail S witch Notes 1 Manually holdi
5. connections Yellow Evaporator switch s proximity Green Water dump valve Compressor contactor Water Pump Hot Gas Valve Condenser Fan cycles on amp off with fan Red Error in system operation P roduct shut down 166240008 16 3 17 95 STATUS INDICATOR Green LED Condenser Fan Yellow LED Left Water Curtain Green LED Hot Gas Valve Green LED Water Pump Yellow LED Right Water Curtain Green LED Compressor Contactor Red LED Error Green LED Dump Valve Curtain Open D13 Yellow L off Right evaporator curtain open D10 Yellow L Left evaporator curtain open Pre Chill Mode Green LED Condenser fan cycles on amp off depending upon condenser temperature Green LED Compressor contactor active Compressor running Yellow LE Right evaporator curtain closed Yellow LE Left evaporator curtain closed only if unit has two evaporators Green LED Condenser fan cycles on and off depending upon condenser temperature Green LED Water pump active Green LED Compressor contactor active compressor running Yellow LED Right evaporator curtain closed Yellow LED Left evaporator curtain closed only if unit has two evaporators Green LED Three seconds after water dump valve becomes active the hot gas valve becomes active Green LED Fifteen seconds after water dump valve becomes active the water pump deactivates Green LED Compressor contactor active compressor running Green LED Water dump valve becomes a
6. BIN DRAIN DRAIN TYPICAL INSTALLATION ALL ELECTRICAL amp PLUMBING 11018 MUST BE DONE PER LOCAL CODES DRAIN Provide a suitable trapped open drain as close as possible to the area where the ice maker is going to be installed This may be an existing floor or a 1 1 4 trapped open drain Two separate drain lines are required for air cooled units one for the storage bin and one for the dump valve drain hose An additional separate drain line will be required for water cooled units from the outlet of the condenser coil to the drain Run all gravity drain lines with a good fall to the open drain All Plumbing Must Be Installed In Accordance With Local Codes NOTE In some cases it may be necessary to insulate the water supply line and drain line Condensate dripping to the floor can cause serious staining of carpets or hardwoods DRAIN CONNECTION INSTALLATION INSTRUCTIONS Taking care not to kink or collapse vinyl tubing at any point route tubes to any open trapped or vented floor drain Run tubing to drain separately Do not tee any drain hoses together Add drain tubing required to reach floor drain WATER LEVEL RESERVOIR The Float Valve is mounted in a fixed position thru it s mounting bracket to maintain the proper water level in the water reservoir For the 300 amp 322 series units the bracket is mounted thru the bottom hole of the bracket 166240008 6 3 17 95 SUPPORT WEB ADJ UST HERE WATER LEVEL FLOAT ASSEMBLY ILLO
7. CAR ee 20 THERMOSTATIC EXPANSION VALVES 20 STARVING PRODUCT SYMPTOMS 21 166240008 TABLE OF CONTENTS cont d Page FLOODING PRODUCT SYMPTOMS 21 WATER REGULATING VALVE 21 SERVICE STEM VALVES ua usus ER a Q PRU PURI 22 MOISTURE CONTAMINATION 1 ccc cece IH HH HH 22 COMPRESSOR CONTACTOR 23 COMPRESSOR amp STARTING COMPONENT CHECK OUT PROCEDURE 23 RELAY 23 uet kanes Bade vn A doa Ming aN eee Ap ER RU d 23 CAPACITORS 22255 Rote e e reete ea bed bec eee a aca 24 COMPRESSOR Seite eicit eed oet cic lc pe Pede e E iicet 24 EEAK DETEGTION 5i hcec eet Rite etl o ios 25 SYSTEM EVACUATION amp RECHARGING 25 SELF CONTAINED PRODUCTS bre E ER hen Qu REG 25 CONDENSER FAN CYCLING 27 HIGH PRESSURE SAFETY SWITCH 27 WARRANTY Ern phi eins d 28 166240008 i SAFETY INFORMATION Recognize Safety Information This is the safety alert symbol When you see this symbol on our machine or in this manual be alert to the potentially of personal injury Follow recommended precautions and safe operating practices Understand Signal Word
8. air circulation is not restricted The unit should not be located near a kitchen grill Air which contains grease vapors will deposit grease on the condenser The condenser should always be kept clean UNIT SET UP 1 Take off front panel of machine and remove hardware bag and service manual envelope 2 Mountthe ice maker to the top of the ice storage bin or adapter in the proper position over the ice drop opening The ice maker must then be sealed both on the outside and the inside bottom edges with an ap proved N S F mastic such as Dow R T V 732 734 or G E R T V 102 108 Diagram 2 This is an N S F requirement and the responsibility of the installer 3 Remove shipping tape from evaporator curtains 166240008 4 3 17 95 Diaaram 2 MAKE ELECTRICAL POWER SUPPLY CONNECTION Requirements 115V 60 Hz 1 ph 230V 60 Hz 1 ph or 220V 50 Hz 1 ph when used Refer to serial plate for minimum circuit ampacity and maximum time delay fuse size All wiring must conform to national and local electrical codes MAKE PLUMBING CONNECTIONS Water supply install per local codes See diagram 3 The water inlet connection to the unit is a 3 8 male flare connection located at the rear of the ice machine N WARNING If the water pressure exceeds 50 pounds a water pressure regulator should be installed in the water inlet line between the water shut off valve and the strainer Install a reducer fitting on the shut off valve t
9. terminals NO voltage will require checking the electrical circuit working back from the compressor to determine where the voltage supply is interrupted and correct as required The load voltage while compressor is trying to start should not be less than 9096 of rated required voltage Line voltage and wire size effect the life expectancy of the electrical components compressor motor winding solenoid coils etc Poor line quality voltage will cause many erratic electrical problems Remember every electrical product ice ma chine dispenser walk in reach in air conditioner etc required proper power supply to operate Be certain when voltage checks are performed that you are measuring load voltage not line voltage 2 A defective capacitor or start relay may prevent the compressor from starting Should the compressor at tempt to start but is unable to do so or if the compressor hums or trips off on the over protector check the following NOTE For50HZ application on dual rated 50 60 HZ models load voltage while compressor is start ing must not be less than 90 of 50 HZ rating Relay Potential For the potential type contacts are normally closed The start contacts open by C E M F generated by the com pressor at approximately 8096 of the normal operating speed As the contacts open only the start capacitor is removed from the start circuit Both the start and run winding and the run capacitor remain in the circuit This re
10. 23 50 F or above 100 F Water supply flowing pressure must not exceed 50 PSI WARNING Ice maker will not operate properly when water supply temperature is below STARTING THE UNIT After the ice cuber has been unpacked and leveled and all plumbing and electrical connections have been made start the unit and check for proper operation A cuber has three separate circuits the water circuit the refrigerant circuit and the electrical circuit 1 Start checking the water circuit by making sure that there are not thread of flare joint leaks either outside the unit or in the compressor section Next check the water flow over the evaporator and make sure that all holes in the water distributor are open See Diagram 5 and that there is no undue splash or loss of water into the ice bin 3 17 95 7 166240008 Also check to see if the float valve is functioning properly and the correct water level is being maintained Adjust if necessary 2 Check the refrigerant circuit by making sure that the condenser fan is running This will be evident by air noise Is the compressor running Feel the casing for vibration Is the evaporator getting cold 3 Check bin harvest switch operation See procedure in manual DISTRIBUTOR HOLES ILLO25 INSTALLATION INSTRUCTIONS FOR MOUNTING ON DRINK DISPENSERS For mounting ice machine on to an ice drink dispenser you should have the proper install kit Checkout Procedure For Harvest Bin Swit
11. 8 10 3 17 95 AVERAGE OPERATING CHARACTERISTICS AC 322 IP Units FREEZE CYCLE HARVEST CYCLE WATER SUCTION SUCTION AVERAGE AVERAGE PRES CYCLE PRES CYCLE ICE ICE SURE TIME SURE TIME WEIGHT WEIGHT Psig Min Sec Psig Min Sec Ib Cycle Ib Day s s 7 so w AMBIENT SI Units FREEZE CYCLE HARVEST CYCLE WATER SUCTION SUCTION AVERAGE AVERAGE PRES CYCLE PRES CYCLE ICE SURE TIME SURE TIME WEIGHT kPa Min Sec kPa Min Sec kg Cycle ae sh Pp Ca gt ue m us om e x Ca gt 2 s ua m lt u gt Ca e a o m AVERAGE OPERATING CHARACTERISTICS WC322 AMBIENT i IP Units FREEZE CYCLE HARVEST CYCLE WATER bs SUCTION SUCTION AVERAGE AVERAGE PRES PRES ICE ICE SURE SURE WEIGHT WEIGHT PSIG PSIG LB CYCLE LB DAY m gt gt xmas o m gt gt u as gt o om gt gt u a w 2 Law m m SI Units FREEZE CYCLE HARVEST CYCLE WATER AMBIENT AVERAGE AVERAGE ICE ICE WEIGHT WEIGH
12. SERIES 322 ICE CUBE MACHINE Service Installation Guide Part No 166240008 March 17 1995 THIS DOCUMENT CONTAINS IMPORTANT INFORMATION This Manual must be read and understood before installing or operating this equipment IMI CORNELIUS INC 1995 PRINTED IN U S A TABLE OF CONTENTS Page SAFETY INFORMATION 1 SPECIFICATIONS s 3 eon dad aw EE cest 3 EEECTRIGAE 3 cts Q a kon Pa ph apenas 3 PLUMBING CONNECTIONS 3 UNPACKING ZC Ses ec ew nee aie idee E CE ee tcu d 3 LEVELING dere ET XA de eR eran ad 4 eS LES Er ner ect eme roster o N A eed 4 ita art ust Deme tp De rice p DE cC 4 MAKE ELECTRICAL POWER SUPPLY CONNECTION 5 MAKE PLUMBING CONNECTIONS 5 FOR WATER COOLED UNITS 5 DRAIN erc EIE 6 DRAIN CONNECTION INSTALLATION INSTRUCTIONS 6 WATER LEVEE RESERVOIR tede ES ere de ecce 6 STARTING THE UNIT creber b Ee Rex rea er Ce RE a ads 7 INSTALLATION INSTRUCTIONS FOR MOUNTING ON DRINK DISPENSERS 8 CHECKOUT PROCEDURE FOR HARVEST BIN SWITCHES 8 ADJUSTMENT PROCEDURE FOR HARVEST BIN SWITCHES 8 SANITIZING AND CLEANING PROCEDURE 9 WATER TREATMENT reed be
13. T kg Cycle kg Day AMBIENT 9 99 9 s 3 p sa sua aa rcgem Bev cur sper er eue sss d GEHE a ae pore ne ae MEAM NEN L L 3 17 95 166240008 STAGOW 5 1315 5 NOLLVYsA Desay Q31002 n 1 DAT uos SAYdNOD d a B S MO1 uas adis s GION310S SVO LOH NOISNVdX3 pm ie H35NVHOX3 LVdH Z s i INVA ualvM 3 17 95 166240008 166240008 YOSSAYdNOD 2ZEDIM S TaqOlA SWALSAS H3 L VM ANV INVA 3ATIVA ADIAYSS 3905 MOI 5 H9IH lt s x Lh ee ae GION31OS SVO LOH 2 1 NOISNVdX3 H
14. ating pressures and temperatures may cause the drier filter to release a portion of it s held moisture It is also imperative to avoid opening the sealed refrigeration system whenever possible and when it is done to be certain the true problem is correctly diagnosed and repaired Remember service gauge sets should only be installed after all external checks have been performed CAUTION Megger checks should NEVER be performed on any compressor that is under a vacuum COMPRESSOR CONTACTOR The contactor serves as the voltage supply switch for the compressor circuit Voltage to the coil of the contactor is supplied by the circuit board Check Out The two 2 line supply screws of the contactor should always have supply voltage present when voltage is on to the product The other two 2 screws load should have line voltage when the contactor is energized The contactor coil receives its supply voltage from the circuit board Should the contactor fail to energize Check for supply voltage from circuit board lead connections to contactor coil and ohms value of coil 3 if the product is 3 phase COMPRESSOR amp STARTING COMPONENT CHECK OUT PROCEDURE When compressors fail to start or run properly itis normally the external electrical supply or the compressor start components that are defective the overload protector start and or run capacitor relay circuit board safety controls etc 1 Check voltage at compressor
15. aut DLLVLSOWYSHL p s H35NVHOX3 LVdH YOLVYOdWAR L3 NI H3 LVM AATWA 3 17 95 DUMP CYCLE SUPPORT WEB ADJ UST HERE RESERVOIR WATER LEVEL FLOATASSEMBLY ILLO23 1 With the proper water level in the water pan start the water pump to circulate the water Check that the float will return water level to original setting and stop inlet water 2 Push manual dump switch allow dump action to drain the water pan When you release the momen tary switch the pump will stop and the float will return the water level back to its original setting and shut off the water supply 3 You have the option of selecting dump cycle intervals of every cycle Standard setting from factory every 3rd cycle every 5th cycle every 7th cycle Remember the higher the mineral content in the water supply the more often it will be required to dump the wa ter and or clean the product if proper water treatment is not used
16. be covered Any defective parts to be repaired or replaced must be returned to us through a CORNELIUS distributor dealer transportation charges prepaid and they must be properly sealed and tagged The serial and model number of the Machine and the date of original installation of such Machine must be given The warranty of repaired or replaced parts will not extend beyond the period of the original warranty The decision of the CORNELIUS Service Department regarding the warrantability of parts and eligibility for the labor allowance will be final No representative distributor dealer or any other person is authorized or permitted to make any other warranty or obligate CORNELIUS to make any other warranty or obligate CORNELIUS to any liability not strictly in accordance with this policy This warranty is in lieu of all other warranties expressed or implied and of all other obligations or of liabilities on our parts OUR LIABILITIES ARE LIMITED SOLELY AND EXCLUSIVELY TO REPAIR OR REPLACEMENT OF THE DEFECTIVE PRODUCT WE ARE NOT LIABLE FOR ANY SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES OF ANY KIND WHATSOEVER In those jurisdictions where liability for damages cannot be disclaimed original purchaser s recovery shall not exceed the cost of the warranted product Except for descriptions of size quantity and type which may appear on CORNELIUS product with specifications of certain industry government or professional organizations standards which may appear as
17. ches Turn on the ice machine and move the evaporator curtain s away from the evaporator s The ice machine should then shut off in approximately 10 seconds See detail A amp B Slowly let the evaporator curtain s move back toward the evaporator s until the bottom edge of the curtain s is at least at the bent edge of the water reservoir or closer to the evaporator With the curtain s at that position the machine should start See detail C DETAIL B CURTAIN EDGE SENSOR THERMO 2 9 AT MAGNET BOTTOM EDGE OF PROXIMITY EVAPORATOR SWITCH CURTAIN B Y fe CURTAIN T ACORN NUT WATER RESERVOIR ill 021 DETAIL A Adjustment Procedure For Harvest Bin Switches If adjustment is necessary loosen acorn nuts and move proximity switch closer to the curtain s and make sure the curtain is properly mounted See detail A 166240008 8 3 17 95 Re check per above procedure SANITIZING AND CLEANING PROCEDURE 1 2 3 4 5 8 9 Remove front panel to gain access to the on off clean switch Push switch to Clean and allow the ice on the evaporator to release or melt away ELECTRICAL BOX _ SWITCH DUMP SWITCH ON OFF CLEAN Remove ice from storage bin If lime scale is present add 2 oz of Lime A Way or Calgon NickelS afe Ice Machine Cleaner directly into water reservoir Circulate for not longer than 10 minutes Depres
18. create adverse operating conditions in the product A bubble test and or additives with UV lamp may be the best team for the most positive leak testing results 5 Never pressurize a system with oxygen or a mixture of refrigerant and air Either of these methods may cause a system explosion to occur 6 Pressurizing systems to leak test should only be done with dry nitrogen Be sure the regulator setting does not exceed the recommended system pressure CAUTION A full cylinder of nitrogen will have pressure of approximately 2700 PSI 7 Failure to correct leaks will also cause shorter compressor life as a result of the higher operating tempera tures Always leak check the total system as one located leak may not be the only leak SYSTEM EVACUATION amp RECHARGING Should service work ever be required on a product where the sealed refrigeration is opened for any reason the refrigerant must be reclaimed drier filter replaced evacuated and recharged The old method of purging is NOT ACCEPTABLE Always evacuate the system through both the high and low side service valves Be certain both valves are completely open when evacuating and the drier filter has been replaced SELF CONTAINED PRODUCTS Every effort should be made to never have the system open to the atmosphere for longer than 15 minutes and the replacement of the drier filter is no longer an option IT IS MANDATORY A good vacuum is not always easy to measure however the
19. ctive at the start of harvest Water dump valve is active for 15 seconds Yellow LE Right evaporator curtain closed When the ice falls and the curtain opens the LED will turn off Yellow LED Same as D13 if there is a second left evaporator EVAPORATOR OPEN THERMISTOR CIRCUIT thermistor open broken wire poor connection Ice maker is SHUT DOWN Consult service manual Diagnostic Section for troubleshooting guide on EVAPORATOR HIGH TEMP ERROR Six minutes into the Freeze cycle the suction line tempera ture failed to reach 409 or below Ice Maker is SHUT DOWN Consult service manual Diagnostic Section for troubleshooting guide on TWO REPEATED FAILED HARVEST CYCLES No ice drop Flashing 1 sec CONDENSER OPEN THERMISTOR CIRCUIT Air Cooled only Thermistor open broken wire poor connection Ice Maker is SHUT DOWN Consult service manual Diagnostic Section for troubleshooting guide Flashing 1 sec CONDENSER LOW TEMPERATURE CONDITION Condenser midpoint reaches 36 Ice Mak eris SHUT DOWN Flashing 1 sec CONDENSER HIGH TEMPERATURE SAFETY SHUT DOWN 3 17 95 17 166240008 CIRCUIT BOARD DIAGNOSIS Turn the power switch OFF and center position Disconnect the proximity switches and thermistors from the circuit board Remove a sleeve jumper from the options terminal and place it on terminals 4 and 5 of the test plug Turn the power switch to the ON position and remove the sleeve jum
20. d and all sanitizing solution must be purged from the syrup systems All water must also be purged from the plain and carbonated water systems A freezing ambient temperature will cause residual water remaining inside the Unit to freeze resulting in damage to internal components of the Unit 3 17 95 1 166240008 THIS PAGE LEFT BLANK INTENTIONALLY 166240008 2 3 17 95 SPECIFICATIONS 322 SERIES A 22 00 FA 6 FT ELEC 500 TRICAL 1 00 CORD 2007 FRONT 16 38 1 1475 2 125 _ b m 23 50 3 10 2 75 M 5 00 33s B d o 2 pod 23 50 2200 7 pue NOTE MUST USE 20 AMP RECEPTACLE A WATER INLET B PUMP OUT DRAIN ELECTRICAL CONNECTION D CONDENSATE DRAIN E CONDENSER WATER OUT W C ONLY F CONDENSER WATER IN W C ONLY ill 140 Net Weight 122 Ibs Shipping Weight 138 105 Compressor Copeland 5 300 BTU Refrigerant uir ninyi 22 Electrical Freeze Cycle Amps Draw 8 0 Time Delay Fuse Retains amps 20 0 Minimum Circuit Ampacity amps 20 0 Power Supply Single Phase 115V 60 Hz Plumbing Connections Inlet Water Max pressure 50 PSI 3 8 SAE MFL Ftg Ne vers REM ENS Through Bin Waster Water from water c
21. e ath E EA eO e eee e 10 WINTER STORAGE erret eicere eoe ne 10 CLEANING THE AIR COOLED CONDENSER 10 OPERATING CHARACTERISTICS 11 REFRIGERATION AND WATER SYSTEM MODEL 322 12 REFRIGERATION AND WATER SYSTEM MODEL WC322 13 DUMP CYCLbE re dag ennai 1 D E E Bocas oe OUR E d 14 ADJUSTING BRIDGE THICKNESS 15 TOTAL ICE XGAPBACIDY iiu ciue eer tt GR cec o een 15 ICE PRODUCTION CHECK eee larch eee cb e eco eir 15 LED INDICATORS RR padi biped amb waned Pet 16 CIRCUIT BOARD DIAGNOSIS n Ry e a e Rs 18 COMPONENT 2 2 2 19 TEST PU Gi 2 E E e E dece EOD EE 19 SENSORS sev ERIS der ine besote eet seio he reti dana A ke 19 RESET OPERATION Schi an ee oc 19 EVAPORATOR SWITCHES 19 HARVEST SAFETY TERMINATION 19 VOLTAGE GHECKS ur testes sek EL bc el CERAM EE Ee 19 EVAPORATOR PROXIMITY 5 19 VOLTAGE SELECTOR 5 20 SENSOR THERMISTOR DIAGNOSIS 20 SENSORS renes Vk ater Wega ea ee dO
22. e excluded from this warranty clause LIMITED LABOR WARRANTY PERIOD In addition to the parts warranty CORNELIUS will pay scheduled straight time labor to repair or replace a defective component when failure occurs within three years 36 months from the date of installation or 39 months from the date of shipment by CORNELIUS whichever time period elapses first Such service is to be performed by a service agency authorized by CORNELIUS Time and rate schedules for labor compensation will be published periodically by CORNELIUS Additional expenses including but not limited to travel time truck charges overtime charges material cost accessing or removal of the ice machine normal prescribed maintenance cleaning adjustments and ice purchases are the responsibility of the original owner No parts warranty or labor allowance on the motor compressor assembly will apply when the ice machine s refrigeration system is modified with a condenser heat reclaim device or parts and assemblies not provided by CORNELIUS unless CORNELIUS provides approval in writing for these modifications for specific locations The parts warranty shall not apply when destruction or damage is caused by alterations unauthorized service using other than factory authorized replacement parts risks of transportation accidents misuse damage by fire flood or acts of God No components or assembly from which the serial number or identification number has been altered or removed will
23. eservoir with clean fresh water Circulate for approximately 1 minute Depress dump valve switch and allow water to drain away Repeat three times Push switch from clean to on position Replace front panel 3 17 95 9 166240008 WATER TREATMENT Depending on the water source for the ice maker water treatment may be necessary to prevent calcium or lime scale deposits bad taste and odor chlorine problems as well as slime growth If these conditions exist contact your Cornelius Distributor or Dealer for information on water treatment systems Cornelius offers WINTER STORAGE If the unit is to be stored in an area where the temperature will drop below freezing it is most important that all water lines be drained to prevent them from freezing and possible rupture To blow out the waterline disconnect the water supply at the cabinet inlet and use air pressure to force the wa ter into the water reservoir pan This can then be removed from the water pan CLEANING THE AIR COOLED CONDENSER COIL In order to produce at full capacity the refrigeration condenser must be kept clean The frequency of cleaning will be determined by surrounding conditions A good maintenance plan calls for an inspection at least every two months CAUTION Condenser cooling fins are sharp Use care when cleaning Clean the air condenser coil from the back of the machine with a vacuum cleaner Remove all the accumulated dust lint and dirt 16624000
24. fice PARTS WARRANTY PERIOD IMI CORNELIUS INC hereinafter referred to as CORNELIUS warrants to the original owner of anew CORNELIUS commercial cube ice machine Machine who buys solely for commercial uses that the Machine shall be free from defects in material and or factory workmanship if properly installed operated and maintained under normal and proper use and service conditions with competent supervision The parts warranty period is three years 36 months from the date of installation or 39 months from the date of shipment by CORNELIUS whichever time period elapses first With respect to compressor solid state control board and the evaporator s the warranty period will be five years 60 months from the date of installation or 63 months from the date of shipment by CORNELIUS whichever time period elapses first Warranty on evaporator plating limited subject to the incoming water conditions and proper cleaning and maintenance The obligation of CORNELIUS under this warranty is limited to repair or replacement at the option of CORNELIUS FOB factory in Mason City lowa of the part or Parts of any Machine that is proven defective LIMITED LIFETIME WARRANTY In addition to the above stated parts warranty Cornelius further warrants the stainless steel cabinet and frame assembly to the original owner at the original installation site against cracks rust or corrosion under normal operating conditions Models IACS50 AC322 and WC322 ar
25. goal is to have less then 196 non condensible va pors in the system at the completion of the evacuation Basic guidelines with a good pump would be to evacu ate a selfcontained product 30 to 45 minutes and a remote product no less than 60 minutes 3 17 95 25 166240008 The system should be evacuated to approximately 200 250 microns Then perform a 5 minute holding test You may expect a low grade loss of the vacuum as normal However a rapid rise to normal atmospheric pressure would signal a system leak is present and must be located and repaired before recharging the product A slower pressure rise to approximately 1500 microns would signal moisture still present in the refrigeration system Ona WET system it would be beneficial to use heat lamps to raise the temperature of the compressor dome and evaporator surface area during the evacuation To assure a properly recharged product the refrigerant charge must be weighed into the product using an elec tronic charging scale or dial a charge On air and water cooled products the charge should be introduced into the high side service valve On remote systems the charge should be introduced into the product receiver MANIFOLD SET 00
26. gulating valve is used on water cooled cubers only The valve is installed in the condenser outlet water line It s function is to control the proper operating head pressure by regulating the amount of water flow ing through the condenser The valve is adjustable and factory set to maintain condenser discharge water tem perature 104 108 F Setting the water regulating valve to maintain discharge water temperature eliminates the need to enter the sealed refrigeration system When checking the valve the water temperature should be taken as close to the condenser discharged as possible The water temperature will equate to operating head pressure of approximately 225 PSI Should adjustment be required the valve has an adjustment stem on the top of the valve After allowing the cuber to operate for 10 minutes in the ice making mode to balance the system turning the adjusting stem CW will increase the discharge water temperature CCW will decrease the discharge water temperature 3 17 95 21 166240008 The water regulating valve must close off condenser water flow completely during the hot gas harvest cycle There should be no discharge water flowing out of the condenser during the harvest cycle Should the valve fail to close during the harvest mode the condenser will continue to condense the compressor discharge vapor needed for the harvest cycle and this will result in long harvest times Leaking bypassing water regulating val
27. hemical analysis is required to assure that this standard is met 166240008 26 3 17 95 Chemical analysis is the key requirement to the definition of Reclaim Regardless of the purity levels reached by a re processing method the refrigerant is not reclaimed unless it has been chemically analyzed and meets ARI Standard CONDENSER FAN CYCLING CONTROL The condenser fan on air cooled cubers is cycled by the circuit board The condenser sensor signals the circuit board when the condenser temperature reaches 100oF 389 the fan starts and continues to run until the tem perature is reduced to 88 3106 NOTE There is no pressure control used to cycle the fan motor HIGH PRESSURE SAFETY SWITCH All water cooled and remote products contain a high pressure safety cut out switch The function of this switch is to shut down the cuber should excessive pressure develop in the high side of the refrigeration system This switch will open the power supply at 400 PSI high side pressure Should this control open it must be reset manually and the cause for the increase in pressure determined 3 17 95 27 166240008 CORNELIUS LIMITED COMMERCIAL WARRANTY PLAN TO THE ORIGINAL OWNER OF A CORNELIUS COMMERCIAL CUBE ICEMAKER This warranty applies to Icemakers installed within the United States Canada Mexico and Puerto Rico only For warranty information outside the U S Canada Mexico and Puerto Rico contact your nearest IMI Cornelius Sales Of
28. inutes and seconds 1440 divided by CT number of cycles per 24 hours Measure weight of ice from one cycle in pounds and fractions of a pound Example Weight cycle x cycles day total production 24 hrs Compare to the production tables f water cooled be certain water regulator valve is set to maintain 225 235 P SI head pressure RH Evap Switch LH Evap Switch Condenser Sensor D Lo gS White Suction Line Sensor Brown Water To Stacked Unit if required LED INDICATORS D 15 _ Dump O O 0 13 AA Valve xe 0 14 gt Contactor 7 RH Evap O O O 6 Water xen Pump 30 4 D 10 D 12 1 LH GR le Hot Gas Condenser plug D 11 Suction plug Fan Voltage Selector xt D 6 Switch Test x Plug us GR jo X Error Options O Plu 9 Adjustable Ice Thickness Pot Transformer Micro Processor Stacking lt Cable Plug M anual Harvest O Switch 230v neutral 115v The LEDs are board circuit indicators If the LED in the functional board circuit is complete check component Example Contactor does not energize and LED is ON board circuit is OK Check contactor coil leads amp
29. lay may or may not be directional in mounting 3 17 95 23 166240008 Current For the current type contacts are normally open The start contacts close by the high current draw from the locked rotor condition with only the run winding in the circuit As the contacts close the start capacitor and the start winding is energized and the compressor starts At approximately 80 of its operating speed the current draw drops off the relay contacts open removing the start winding and start capacitor from the circuit Remem ber current relays are directional in their mounting to allow contacts to lift and close Capacitors A quick check is to replace suspected defective capacitors with known good capacitors being careful to stay within the range for substitute values Should those values be unknown a basic rule for capacity is for start ca pacitors 10 and run capacitors 5 of the rating on the defective original capacitor being replaced Voltage should always try and be matched if it cannot be itis acceptable to increase up to 1096 higher than the voltage listed on the capacitor being replaced NEVER put a capacitor on a product with a voltage rating lower than the original being replaced If a capacitor analyzer is not available an ohm meter may be used to check a capacitor for short or open circuits Set the ohm meter to its highest scale and connect its leads to the capacitor terminals 1 With a capacitor without plate defect the indicat
30. n up position selection is for 230 VAC SENSOR THERMISTOR DIAGNOSIS Sensors Condenser or suction line Turn Cuber power switch OFF Disconnect sensor plug from board Use digital multimeter set for D C Voltage Turn power switch ON Connect leads of meter across the two pins of the sen sor being checked Meter should read 2 5 VDC E0 2 output voltage from the board If voltage is not correct re place the circuit board Should the cuber operation indicate there may be a fault in the sensor thermistor or the control board circuit proceed as follows l Using a good multimeter check the control board sensor output voltage 2 If voltage checks are correct do the following A Disconnect the suction line sensor brown lead from the control board B Install the special test cord to the control board and reinstall the sensor to the test cord terminals C Connectthe multimeter set on VDC milli volts to the test cord leads D Operate the cuber in the freeze cycle 3 Asthe suction line temperature decreases the milli volt reading will increase 4 Sensor Shorted milli volt reading will cease to increase and will remain steady indicating a shorted sen sor 5 Sensor Open The voltage reading will indicate the control board output voltage of 2 5 VDC 6 Should either 4 or 5 happen during this test the sensor will require replacement Special test cord part 164984009 may be ordered through the Service Department
31. ng testing the additional heat at the top of the evaporator will cause thinner ice at the top than when the panels are in place Should a different thickness of the bridge be desired it will be required to adjust the ice thickness POT lo cated on the circuit board as follows 1 Thinner Bridge turn the ice thickness pot adjustment screw GCW one full turn Allow two cycles before determining if additional adjustments are required 2 Thicker Bridge turn the ice thickness pot adjusting screw OCCW one full turn Allow two cycles before determining if additional adjustments are required Never judge the thickHek amp s of the ice from the first batch of the ice produced the first cycle is a bal ance cycle Always wait for the second cycle before making any adjustments TOTAL ICE CAPACITY Ice capacity of any ice maker is affected by many operating conditions such as water and air temperature and location factors Please review the capacity tables in this manual for average 24 hour capacity under various conditions All printed capacity 5 are 10 except 50 HZ units These products have 12 increase in cycle time and capacity decrease of approximately 17 ICE PRODUCTION CHECK If air cooled take air temperature at the intake of the condenser 2 from the condenser fins and Incoming wa ter temperature at the outlet of the float valve 3 17 95 15 166240008 Cycle time CT freeze time plus harvest time in m
32. ng the curtain open during freeze mode will shut the Cuber down in 5 seconds 2 During harvest cycle if curtain is open for 10 seconds the water pump will stop The compressor will oper ate for 20 additional seconds before Cuber shut down takes place When the water curtain is closed the Cuber will begin the normal start up process 3 In single evaporator machines the proximity switch connection must be on the top RH connection on the circuit board 4 dual evaporator machines both RH and LH switches must open and reset to start the next freeze mode Harvest Safety Termination After 4 minutes in the harvest mode the safety timer in the circuit board will terminate the harvest mode and place the Cuber back into a freeze mode This safety cycle will protect the evaporator etc should the product fail to terminate the harvest mode for any reason VOLTAGE CHECKS Evaporator Proximity Switch Turn Cuber power switch OFF Disconnect proximity switch plug s from the circuit board Use a digital multime ter set for D C Voltage turn power switch ON connect leads of meter across the top two terminal pins on the board for the switch being tested meter should read 5 VDC 0 2 output voltage If not replace the circuit board 3 17 95 19 166240008 VOLTAGE SELECTOR SWITCH 1 Selector bar in center position switch is open Product is inoperative 2 Selector bar in down position selection is for 115 VAC 3 Selector bar i
33. o accommodate the water stainer which is supplied with each ice machine and MUST be used This is very important for cleaning Connect either 3 8 or 1 2 copper tubing be tween the water inlet fitting of the ice machine and the water strainer For water cooled units Two water inlet connections are provided One for the ice making evaporator section which is located on the back of the machine and is a 3 8 flared connection The other is for the water cooled condenser The reason for the separate water inlet connections is that some installations use a water tower for cooling the water used in the water cooled condenser and some installations use treated water filtered for the ice making inlet water connections Be sure to install water line incoming to the 3 8 male flare connection on the back of the unit that supplies water to the water regulating valve inside The setting of the water regulating valve from the factory should be 200 pounds for R 22 units NOTE Always flush out water lines before starting unit Ad justments if necessary should be done at installation 3 17 95 5 166240008 POWER CORD 322 UNIT ONLY NOTE TAKE CARE NOT TO KINK OR COLLAPSE VINYL TUBING d TRAINER WATER NON DIRECTIONAL SERVICE VALVES 50 PSI MAX WATER PRESSURE WATER SUPPLY ICE MAKING WATER SUPPLY WC CONDENS ER DUMP VALVE DRAIN VENT DRAIN WC BRAIN CONDENSER PIPE DRAIN CONDENSATION VENT OPEN TRAPPED OR VENTED
34. ooled models Two 3 8 in SAE MFL Fittings Pump Out Drain Connection 1 2 in ID Tubing UNPACKING 1 Uncrate machine and or bin by removing the staples from around the bottom of cardboard crate and lift off 2 Remove bolts fastening the crate skid to the bottom of the unit If auxiliary legs have been purchased for the bin they should be installed at this time 3 17 95 3 166240008 LEVELING 1 1 Iflegs are used adjust the leveling legs of the storage bin until the unit is level and all four 4 legs are in sold contact with the floor Leveling is very important to obtain proper draining and to maintain the proper level in the water pump pan of the ice cuber Note If the bin is to be installed flush to the floor the bin must be sealed to floor with an approved mastic such as Dow R T V 732 734 or G E 102 108 This is an N S F requirement and is the respon sibility of the installer UNIT LOCATION 1 Allow at least a minimum of six inches at the rear and side of the ice machine for proper air RHP circula tion 2 This unit has been designed to be installed in an indoor location which is clean and which can be adequate ly ventilated The air and water temperatures should never exceed 100 F or fall below 50 F Temperatures above 100 F will cut the ice making capacity below an economical level Temperatures below 50 F will cause a malfunction of thermostatic sensors 3 The unit should be located where
35. or should first move to zero 0 and then gradually in crease to infinity 2 fthere is no movement of the ohm meter indicator an open circuit is indicated 3 Ifthe ohm meter indicator moves to zero 0 and remains there or on a low resistance reading a short cir cuit is indicated 4 Please note this check does not determine if the capacitor will deliver the proper rated MF D UFD required it only shows if the capacitor has shorted or open circuits 5 Capacitors that show any signs of leakage of electrolyte or damage of the can should be replaced DO NOT TEST Compressor 1 Using an ohm meter check for continuity from compressor terminal C to R and C to S If the compressor is hot wait one 1 hour for compressor to cool and recheck An open internal overload protector can cause a lack of continuity If continuity cannot be measured through all windings the compressor must be replaced 2 To check the compressor motor for accidental ground perform a continuity check between terminals C R and S to the compressor shell or a copper line of the refrigeration system do not use a painted surface Continuity present the compressor windings are grounded and the compressor must be replaced If the compressor starts but trips repeatedly on the overload protector remember that the overload is both tem perature and current activated Be sure to check Low voltage Undersized supply lines High head pressure High suction pressure Defecti
36. per from terminals 4 and 5 The LED indicators will cycle on for approximately 2 seconds each in the following sequence 1 Red D 5 error Will only cycle if ice thickness pot is within factory setting 2 Green D 6 condenser fan 3 Green D 11 hot gas valve 4 Green D 12 water pump 5 Green D 14 relay contractor 6 Green D 15 dump valve Failure of the LED s to cycle in this sequence will signal a defective circuit board D 15 Water O paa xt Dump Valve RH Evap Switch YL Su D 14 xt Contactor Z p RH Evap 7 50 O6 Water 3 LH Evap Switch xt Pump O 04 D 10 D 12 1 O2 MESS utes Condenser Sensor GR re Hol Gas Condenser White plug 0 1 230v Suction Line Sensor Options Plug Suction plug Fan Voltage Brown Selector neutral xt D 6 Switch Sleeve Connector 5 Test 115v x i Plug D GR O O 2 Pd D 5 Error D Options O o Plug Adjustable Ice o O Thickness Pot Transformer Dump Dump Dump Dump Every Every Every Every Cycle 3rd 5th 7th Micro Processor Cycle Cycle Cycle Stacking Cable Plug Manual To Stacked Unit witc if required O En
37. problems to determine A Meg Ohm meter Megger can be a valuable tool to aid in the analysis of this problem A Meg Ohm reading log may be started any time after 90 days of operation of the product To perform the test proceed as listed Disconnect all three 3 compressor leads take a Meg Ohm meter reading from each compressor terminal to a good chassis ground Compare reading to chart below Meter Reading Meg Ohm 166240008 Compressor Condition Okay Moisture present Severe moisture amp possible con taminated oil with acid present System has severe contamination 22 Maintenance Required None needed Replace drier Replace drier with acid hold type Run 24 hours change to regular drier Remove compressor oil and refrig erant charge Evacuate install liq uid and suction line driers acid hold type Recharge with new oil and refrigerant Run 24 hours Dis charge system discard suction line drier replace the liquid line dri er Evacuate and recharge 3 17 95 Readings in the range listed below 100 Meg Ohm would be an indicator that the system being tested may have a contamination problem Where does the problem come from As an example the filter drier may become sat urated and hold large percentages of moisture and the system function without a problem until such time as the product operating conditions change Should the room temperature increase or the condenser plug up etc the higher oper
38. product information disclosures in CORNELIUS literature and other documents from time to time THIS WARRANTY IS IN LIEU OF AND EXCLUDES ALL OTHER WARRANTIES EXPRESSED OR IMPLIED INCLUDING WARRANTIES OR MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE CORNELIUS MAKES NO WRITTEN WARRANTY TO ANY PURCHASER WHO BUYS FOR PERSONAL FAMILY OR HOUSEHOLD USE P N 163238001 CORNELIUS INC Effective March 1 1996 ONE CORNELIUS PLACE Starting with Production S erial ANOKA MINNESOTA 55303 6234 Number Code 96 A 2 17 05 29 1AADANNNA CORNELIUS INC Corporate H eadquarters One Cornelius Place Anoka M innesota 55303 6234 Telephone 800 238 3600 Facsimile 763 422 3246
39. rmal and or none 3 Ice pattern on evaporator if any thin at top and thick at bottom Flooding TXV Product Symptoms l Ice production lower than normal and or none 2 Suction pressure stabilizes at higher than normal pressure for operating conditions Suction pressure does not modulate and may start to slowly rise 3 Ice pattern will be very heavy atthe bottom and thin atthe top of the evaporator Product may not enter harvest cycle because of higher than normal suction line temperature IMPORTANT Frost on the suction line may be normal on medium temperature refrigeration equipment Frost should be considered a red flag long run times will normally produce some type of frost pattern Before checking the sealed refrigeration system the external conditions that could lead to frost follow l Dirty condenser Dirty condenser fan blade Improper air clearance around Cuber Loose TXV bulb mount Ur deo oe oJ Poor water flow over evaporator 6 Ventilation problems The expansion valves used on Cornelius 4 series ice equipment have special super heat settings and bulb charge designed from the product load and HP 62 refrigerant Should the need arise to replace this or any re frigerant components be certain to use only components recommended by Cornelius for the model of the Cub er being serviced Use of nonapproved components will compound system difficulties and may void product warranty WATER REGULATING VALVE The water re
40. s A signal word DANGER WARNING OR CAUTION is used with the safety alert symbol DANGER identi fies the most serious hazards Safety signs with signal word DANGER or WARNING A WA R N are typically near specific hazards General precautions are listed on CAUTION safety signs CAUTION also calls attention to safety mes A C A UTIO N sages in this manual Follow Safety Instructions Carefully read all safety messages in this manual and on your machine safety signs Keep safety signs in good condition Replace missing or damaged safety signs Learn how to operate the machine and how to use the controls properly Do not let anyone operate the machine without instructions Keep your machine in proper working condition Unauthorized modifications to the machine may impair function and or safety and affect the machine life CO Carbon Dioxide Warning CO Displaces Oxygen Strict Attention must be observed in the prevention of carbon dioxide gas leaks the entire and soft drink system If a CO gas leak is suspected particularly in small area immediately ventilate the contaminated area before attempting to repair the leak Person nel exposed to high concentration of CO gas will experience tremors which are followed rapidly by loss of consciousness and suffocation Shipping Storing Or Relocating Unit CAUTION Before shipping storing or relocating this Unit the syrup systems must be sanitize
41. s dump valve switch on side of control box and allow cleaner or sanitizer to drain away Allow float valve to fill reservoir with clean fresh water Circu late for approximately 1 minute Depress dump valve switch and allow water to drain away Repeat three times CAUTION All ice machine cleaner must be flushed out of the system before the sanitizing solution is used in Step 5 The reaction of the two chemical can cause hazardous gases to be generated Pour 1 4 oz of household bleach into the water reservoir and circulate for 10 minutes to sanitize the circu lating water system including the evaporator pump distributor and all interconnecting vinyl tubing Depress dump valve switch on side of control box and allow cleaner or sanitizer to drain away Allow float valve to fill reservoir with clean fresh water Circulate for approximately 1 minute Depress dump valve switch and al low water to drain away Repeat three times Mix sanitizing solution of 1 2 oz household bleach to one gallon of water This mixture will provide 200 ppm chlorine Using a non metallic bristle brush scrub the following A Inside surface of the ice bin including top and door B Inside surface of the ice maker to include evaporator section in the ice machine including the top front panel and evaporator splash curtain C Make sure splash curtain is correctly positioned Depress dump valve switch and allow cleaner to drain away Allow float valve to fill r
42. ve capacitors Compressor mechanical problems Low refrigerant charge 166240008 24 3 17 95 Leak Detection The new non chlorine based refrigerants HP 62 R 404A require special leak detection devices other than what has been standard for While the instruments for leak detection are different the processes have not changed Basics to remember 1 Look for signs of oil when you visually start your leak check process Oil is carried with the refrigerant If the oil has leaked out so will the refrigerant 2 Refrigerant vapor is heavier than air When leak checking suspect areas probe below the joints or connec tions A Always check the high side of the system with the compressor operational B Check the low side of the system with the system idle C Following a amp b will normally allow the highest pressure on each portion of the system for the best detection 3 Systems short of refrigerant will show improper operational results in both the freeze and harvest cycles Many systems will appear normal in higher operating temperatures and change drastically in cooler con denser temperatures 4 Many new and reworked leak detection instruments have the ability to detect CF C s HCFC s and the new HFC s by making a simple switch selection This type of detector will be more sensitive on one setting than the other This results in finding some leaks that are so small it may take years before the actual leak rate would
43. ves are normally the result of scale build up on the valve diaphragm and the valve should be flushed not replaced To flush the valve open the adjusting stem wide open CCW or force the valve spring up with a screwdriver open and close the water supply to the condenser resulting in the flushing action Should this not correct the problem replace the valve diaphragm This can be done without en tering the sealed refrigeration system Damage to the water regulating valve may also be caused by water hammer Water hammer will result from the condenser inlet and outlet water lines being reversed or defective valve stops in the water supply line Proper installation of water cooled equipment should always include an anti water hammer standpipe in the supply inlet line as close to the cuber as possible SERVICE STEM VALVES When closing the service stem valves to remove your gauge and manifold set always close the high side stem valve first Following this procedure will allow the system to PULL the refrigerant vapor from your manifold set to reduce refrigerant loss When the pressure has been reduced close the low side stem valve MOISTURE CONTAMINATION With the major changes in refrigerants in today s marketplace and the use of hydroscopic oils the control of moisture and contaminates have become more critical to safeguard against than ever before in the history of mechanical refrigeration Contaminates are also the most difficult of all
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