Manitowoc Ice STH003 manual

CM050 CM Model Ice Machines This manual is updated as new Information and models are released Visit our website for the latest manual: www.compact-ice.com STH003 06/06 © Manitowoc Ice, Inc.[...]

2 Safety Notices When using or servicing these Ice Machines, be sure to pay close attention to t he safety notices in this handbook. Disregardin g the notices may lead to serious injury and/or damag e to the ice machine. Throughout this handbook, you will see the following types of safety notices: WARNING Text in a War ning box alerts you to a pote[...]

3 Procedural Notices When using or servicing these Ice Machines, be sure to read the procedural notic es in this handbook. These notices supply helpful information that ma y assist you as you work. Throughout this handbook, you will see the following types of procedural notices: IMPORTANT Text in an Important b ox provides you with information that[...]

4 Read These Before Proce eding: CAUTION Proper installation, care a nd maintenance are essential for maximum ice pr oduction and trouble free operation of your Compact Ice Machine. Read and understand this manu al. If you encounter problems not covered by this manual, do not proceed, cont act Manitowoc Ice, Inc. We will be happy to provide assista[...]

5 TABLE OF CONTENTS GENERAL IN FO RMATI ON............................. 7 MODEL NUMBERS ..................................... 7 ACCESSORIES ........................................... 8 MODEL/SERIAL NUMBER LOCATION ....... 9 OWNER WARRANTY REGIS TRATION........... 9 INSTA LLATI ON .......................................... 13 LOCATION OF ICE MACHIN[...]

6 HOT GAS VALVE ..................................... 52 BIN THERMOSTAT .................................. 55 ICE PRODUCTION CHECK ...................... 57 ADJUSTING CUBE WEIGHT ................... 58 LIQUID LINE THERMISTOR .................... 59 TOTAL SYSTEM REFRIGERATION CHARGE .................................................. 61 COMPONENT SPE[...]

7 GENERAL INFORMATION MODEL NUMBERS This manual covers the following mod els: CMS050A004 WARNING An ice machine co ntains high voltage electricity and refrigerant charge. Repairs are to be performed by properly train ed refrigeration technicians a ware of the dangers of deali ng with high voltage electricity a nd refrigerant under pressure.[...]

8 ACCESSORIES Visit our website at: www.compact-ice.com for these optional accessories: LEGS Four inch adjustable legs ar e available. DRAIN PUMP Pumps waste water from ice machine to drain. MANITOWOC ICE MACHINE CLEANER AND SANITIZER These are the only clean er and sanitizer approved for use with Compact products. Cleaner Part Number Sanitizer Par[...]

9 MODEL/SERIAL NUMBER LOCATION The model and serial number s are required when requesting information from your loc al Compact retailer or Compact Ice at 800-235-9698. T he model and serial number are listed on the MODEL/SERIAL NUMBER DECAL affixed to the ice machine MODEL/SERIAL NUMBER DECAL MODEL/SERIAL NUMBER DECAL[...]

10 OWNER WARRANTY REGISTRATION CARD GENERAL The packet containing this manual als o includes warranty information. Warra nty coverage begins the day you purchase your new ice machine. Compact CM Series Limited Ice Machine Warranty Subject to the exclusions and limitatio ns below, Manitowoc Ice, Inc. ( “Manitowoc Ice” ) warrants this CM Series I[...]

11 This limited warranty only a pplies to the original Purchaser of the Product and is not transferable. T his limited warranty is valid only in the United States. This limited warranty does not apply to: (1) an y cost or expense associated with shipping, accessing, removing, installing or reinstalling the Product to obtain warranty service, inclu [...]

12 IN NO EVENT SHALL MANITOWOC ICE OR ANY OF ITS AFFILIATES BE LIABLE TO THE PURCHASER OR ANY OTHER PERSON FOR ANY INCIDENTIAL, CONSEQUENTIAL OR SPECIAL DAMAGES OF ANY KIND ARISING FROM OR IN ANY MANNER CONNECTED WITH THE PRODUCT, ANY BREACH OF THIS LIMITED WARRANTY, OR ANY OTHER CAUSE. Some states do not allow the exclusion or limitation of incide[...]

13 INSTALLATION LOCATION OF ICE MACHINE The location selected for the ice machi ne must meet the following criteria. If any of these criteria are not met, select another location. • The location must be indoors. • The location must be free of airborne an d other contaminants. • Air temperature: must be at least 50ºF (10ºC) but must not exce[...]

14 ICE MACHINE HEAT OF REJECTION Heat of Rejection* Air Conditioning** Peak 1,145 2,300 * B.T.U./Hour ** Because the heat of rejection varies during the ice making cycle, the figure shown is an average. Ice machines, like other refrigeration equipm ent, reject heat through the condenser. It is helpful to kn ow the amount of heat rejected by the ice[...]

15 LEVELING THE ICE MACHINE After moving the ice machine into the installat ion location, it must be leveled for proper oper ation. Follow these steps to level the ice machine: 1. Use a level to check the levelness of the ice machine from front to back and from side to side. 2. If the ice machine is not level, adjust the leve ling glides or legs on[...]

16 WATER SERVICE/DRAINS WATER SUPPLY Local water conditions may require treatment of the water to inhibit scale formation, filter sediment, and remove chlorine odor and taste. IMPORTANT If you are installing a Manito woc water filter system, refer to the In stallation Instructions supplied with the filter system for ice maki ng water inlet connecti[...]

17 WATER SUPPLY AND DRAIN LINE SIZING/CONNECTIONS Tubing Size Up to Ice Machine Fitting 1/4" (.64 cm) min. inside diameter 3/4" (1.9 cm) minimum inside diameter 3/8" (.96 cm) ID minimum Ice Machine Fitting 1/4" (.64 cm) ID Copper Tubing 3/4" (1.9 cm) Hose Barb 3/8" (.96 cm) Hose Water Pressure 20 psi (1.38 bar) Min 80 [...]

18 ELECTRICAL REQUIREMENTS VOLTAGE The maximum allo wable voltage variation is ±10% of the rated voltage on the ice machine model/serial number plate at start-up ( when the electrical load is highest). • A qualified electrician must det ermine proper wire size dependent upon loc ation, materials used and length of run (minim um circuit ampacity [...]

19 Bi n L i ght Wa t e r S h utte r s Wa t e r Tr ou g h Bin Bin T h er m ost at Adju st ment Gr i l l Cont rol P a ne l Evapo r at o r Co m par t m ent E lect rical Dr ain Pu m p (O ptio na l) Wa t e r Pu m p Dr ain Wat e r In le t Re f r ig er at i o n Co mp r ession COMPONENT IDENTIFICATION[...]

20 Wa t er Sh u t t er Assem b ly E vap o rato r Wa t e r Pu m p W a ter S uppl y Li ne Sp ra y B ar Sp ray Noz zles Wa t e r S hutt er s Contr ol Boar d E v a por a tor Bu cket Not e: Eva p or a t or remo ved for clari t y[...]

21 OPERATIONAL CHECKS Routine adjustments and mai ntenance procedur es outlined in this manual are not covered by the warranty WATER INLET VALVE The water inlet valve energiz es in the harvest cycle. The water level will rise and flo w out the overflow tube and down the drain. Verify the overflow tube is in place in the water trough. T he water lev[...]

22 SAFETY TIMERS The control board has the f ollowing non- adjustable safety timers: • Initial cycle is 5 minutes longer than subsequent cycles. • The ice machine is locked into the free ze cycle for 10 minutes (15 minutes initial cycle) before a harvest cycl e can be initiated. • The maximum freeze time is 120 minutes at which time the contr[...]

23 MAINTENANCE ICE MACHINE INSPECTION Check all water fittings and lines for leaks. Also, make sure the refrigeration tubing is not rubbin g or vibrating against other tubi ng, panels, etc. Do not put anything (boxes, etc.) in front of the ice machine. There must be adequate a irflow through and around the ice machine to maxim ize ice production an[...]

24 AIR-COOLED CONDENSER A dirty condenser restricts airflow, resulting in excessively high oper ating temperatures. This reduces ice production and shortens c omponent life. Clean the condenser at least every six months. Follow the steps below. WARNING The condenser fins are sharp. Use care when cleaning them. 1. The washable aluminum filter on sel[...]

25 INTERIOR CLEANING AND SANITIZING CAUTION Use only Manito woc approved Ice Mac hine Cleaner (part number 00000008 4 clear metal safe ice machine cleaner) and Sanitizer ( part number 94-0565-3). It is a violation of Federal law to use these solutions in a manner inconsistent with their labeling. R ead and understand all labels pri nted on bottles [...]

26 INTERIOR CLEANING AND SANITIZING GENERAL Perform an In Place Cleaning/Sanitizi ng procedure monthly and a Cleani ng/Sanitizing procedure every 12 months for efficient operation. If the ice machine requires more frequent cleani ng and sanitizing, consult a qualified service compan y to test the water quality and recommend appropriate water treatm[...]

27 Step 2 Press the clean switch. The ice machin e will initiate a 2 minute harvest to remove any remaining ic e from the evaporator. Step 3 Remove all ice from the bin. Step 4 Wait 3 minutes until the Clean light flashes, then add the prepared Manito woc Cleaner by lifting the water shutters and pouring directly into the spray area. Step 5 The ice[...]

28 CLEANING PROCEDURE Ice machine cleaner is used to remove lime scale and other mineral deposits. Ice machine sanitiz er disinfects and removes algae and slime. NOTE: All ice must be removed from the bin. Step 1 Prepare 4 oz (1/2 cup) of undiluted Manito woc Ice Machine Cleaner (part number 0000 00084 only) in a container that will fit easily unde[...]

29 Step 7 Take all removed components to a si nk for cleaning. Use 1/2 of the clea ner/ water mixture to clean all components. T he cleaner solution will foam when it contacts lime scale and mi neral de posits; once the foaming stops, use a soft-br istle nylon brus h, sponge or cloth (NOT a wire brush) to carefully clean the parts. Disassemble the [...]

30 Step 15 Wait 3 minutes until the Clean light flashes, then add the prepared Manito woc Sanitizer by lifting the water shutters and pouring directl y into the spray area. The ice machine will automatically time out a ten minute sanitizing cycle, follo wed by eight rinse cycles, and stop. The Clean light will turn off to indicate the sanitizing cy[...]

31 REMOVAL OF PARTS FOR CLEANING AND SANITIZING TOP COVER 1. Remove two back screws. 2. Slide back and lift cover off. WARNING Disconnect electric po wer to the ice machine at the electric switch box before proce eding.[...]

32 WATER SHUTTERS The water shutter is designed to keep the spr aying water from escaping the evaporator comp artment. To remove just the water shutters: 1. Grasp one end of the water shutter and lift up. 2. Pivot water shutter and disengage remaini ng end. 3. To re-install into ice machine, grasp one end of the water shutters, install one end, piv[...]

33 ICE CHUTE The ice chute is positioned ov er the spray nozzles and allows the ice to easily fall into the bin. It must be firml y positioned over the spray bar, with the front edge inside the water trough. Spray nozzles must alig n with the spray holes or spray wa ter will fall into the bin. 1. Grab protruding spray hole on one end a nd lift up a[...]

34 SUMP DRAIN OVERFLOW TUBE 1. Remove clamp. 2. Pull down to remove overflow tube and tubin g as an assembly. The sump trough water will drain into the bin. 3. Remove overflow tube from vinyl tubing by pulling. Remove Clamp & Pull Down[...]

35 WATER TROUGH 1. Depress tabs on right and left side of the water trough. 2. Allow front of water trough to drop as you pull forward to disengage the rear pins.[...]

36 SPRAY BAR, WATER PUM P AND HOSE Remove spray bar clamp and spray bar. 1. Grasp pump and pull straight down until water pump disengages and electri cal connector is visible. 2. Disconnect the electrical connector. 3. Remove the water pump from ice machine. 4. Remove clamp from hose to remove from pump. 5. Do not submerse the water pump motor in c[...]

37 SPRAY BAR DISA SSEM BLY The spray bar supplies water to the individual ice making cups. Water from the water pump sprays through the nozzles, located on the upper portion of the tubes. 1. Grasp one end of the spray bar, lift up and remove from seat formed in evaporator bucket. 2. Remove clamp on water inlet tubing by gr asping both ears on clip [...]

38 REMOVAL FROM SERVICE/LONG TERM STORAGE/WINTERIZATION GENERAL Special precautions must be taken if the ice machi ne is to be removed from service for an extended peri od of time or exposed to ambient temperatures of 32 ° F (0 ° C) or below. CAUTION If water is allowed to remain in the ic e machine in freezing temperatur es, severe damage to som[...]

39 ICE MAKING SEQUENCE OF OPERATION Depending on ambi ent conditions and cold water supply temperature, the ice making proces s will take approximately 30 minutes. 1. Initial Start-Up or Start-Up After Automatic Shut-Off — Water Fill Before the compressor star ts, the water inlet valve will energize to purge old water from the system for about 3 [...]

40 ENERGIZED PARTS CHA RT SELF-CONTAINED ICE MACHINES Length of “ON” Time 175 seconds 5 seconds Automatically determined Automatically determined Until bin thermostat re - closes 3 Water Pump Fan Motor off on on off off 2 Hot GasValve Water Fill Valve on on off on off Control Board Relays 1 Compressor off on on on off ICE MAKING SEQUENCE OF OPE[...]

41 TROUBLESHOOTING DIAGNOSING AN ICE MACHINE THAT WILL NOT RUN WARNING High (line) volt age is applied to the co ntrol board (terminals #20 and #21) at all times. Removing control board fuse or movin g the toggle switch to OFF will not remove the power supplied to the control board. 1. Verify primary voltage is sup plied to ice machine. 2. Verify t[...]

42 5. Verify the “Power” switch functions properl y. • If the red control board light is energized and depressing the “Power” switch does not energize the green “Po wer” light, check the interconnecting wire, then replace the interface board. 6. Verify the bin thermostat functions properl y. • The green “Power” light will b e en[...]

43 ICE MACHINE WILL NOT HARVEST 1. Verify cubes are present in evapor ator and freeze time exceeds freeze chart cycle time. • Initial freeze cycle after resetting at toggle switch will be 5 minutes longer than chart time (refer to Sequence of Operation). • Verify control board is not set for additional freeze time to fill out the ice cubes, see[...]

44 ICE QUALITY IS POOR – CUBES ARE SHALLOW, INCOMPLETE OR WHITE Problem • Cause Ice machine is dirty • Clean and sanitize the ice machin e Water filtration is poor • Replace the filter Water softener is working improperly (if applicable) • Repair the water softener Poor incoming water quality • Contact a qualified compan y to test the q[...]

45 FREEZE CYCLE IS LONG, LOW ICE PRODUCTION Problem • Cause Water temperature is too h igh • Connect to a cold wate r supply, verify check valves in faucets and other equipm ent are functioning correctly Dirty Condenser • Clean condenser High air temperature enteri ng condenser • Air temperature must not exceed 120°F (39° C) Water inlet v[...]

46 ICE MACHINE RUNS & NO ICE IS PRODUCED Problem • Cause No water to ice machine • Correct water supply Incorrect incoming w ater pressure • Water pressure must be 20-80 psi (1.4-5.5 b ar) Spray nozzle is blocked with mineral buildup • Clean and sanitize the ice machin e Ambient temperature is too high or lo w • Ambient temperature mu[...]

47 ANALYZING DISCHARGE PRESSURE 1. Determine the ice machine operating con ditions: Air temp. entering condenser ______ Air temp. around ice machine ______ Water temp. entering sump trough______ 2. Refer to Cycle Times/24 Hour Ice Production/Refrigeration Pres sure Chart for ice machine being checked. Use the operating conditions determin ed in Ste[...]

48 DISCHARGE PRESSURE HIGH CHECKLIST Problem • Cause Improper Installation • Refer to “Installation/Vis ual Inspection Checklist” Restricted Condenser Air Flow • High inlet air temperature • Condenser discharge air re-ci rculation • Dirty condenser fins • Defective fan motor Improper Refrigerant Charge • Overcharged • Non-conden[...]

49 ANALYZING SUCTION PRESSURE The suction pressure gradual ly drops throughout the freeze cycle. The actual suction pressure (and dro p rate) changes as the air and water temper ature entering the ice machine cha nges. These variables also determine the freeze cycle times. To analyze and identif y the proper suction pressure drop throughout the fre[...]

50 PROCEDURE Step . 1. Determine the ice machine operating conditions. Air temp. entering condenser : 90 ° F/32.2 ° C Air temp. around ice machine : 80 ° F/26.7 ° C Water temp. entering water fill valve: 70 ° F/21.1 ° C 2A. Refer to “Cycle Time” and “Operating Pressure” charts for ice machine model being checked. Using operating condi[...]

51 SUCTION PRESSURE HIGH CHECKLIST Problem • Cause Improper Installation • Refer to “Installation/Vis ual Inspection Checklist” Discharge Pressure • Discharge pressure is too hi gh, and is affecting suction pressure, refer to “Freeze Cycle Disc harge Pressure High Checklist” Improper Refrigerant Charge • Overcharged • Wrong type o[...]

52 HOT GAS VALVE General The hot gas valve is an electrically operated valve that opens when energized, an d closes when de-ener gized. Normal Operation The valve is de-energize d (closed) during the freeze cycle and energized (ope n) during the harvest cycle. The valve is positioned bet ween the receiver and the evaporator and performs two functio[...]

53 HOT GAS VALVE ANA LYSIS The valve can fail in two positions: • Valve will not open in the harvest cycle. • Valve remains open during th e freeze cycle. Valve will not open in the harvest cycle Although the circuit board has initiated a harvest cycle, the evaporator temperatur e re mains unchanged from the freeze cycle. Valve remains open in [...]

54 EXAMPLES OF HOT GAS VA LVE INLET/COMPRESSOR DISCHARGE LINE TEMPERATURE COMPARISON Findings Comments The inlet of the hot gas valve is cool enough to touch and the compressor discharge line is hot. This is normal as the discharge line should al ways be too hot to touch and the hot gas valve inlet, although too hot to touch during harvest, should [...]

55 BIN THERMOSTAT Function The bin thermostat stops t he ice machine when the bin is full. The level of ice in the ice storage bin contro ls the ice machine shut-off. When the bin is full, ice cubes contact the bin thermostat bulb holder, which cools down and opens the bin th ermostat to stop the ice machine. The ice machine re mains off until enou[...]

56 Check Procedure WARNING High (line) voltage is applied to the control board (terminals #20 and #21) at all times. Rem oving the control board fuse or depressing the po wer button will not remove the power supplied to the control board. WARNING Disconnect electrical po wer to the entire ice machine before proceedi ng. 1. Verify the capillary tube[...]

57 ICE PRODUCTION CHECK The amount of ice a machine produces directly relates to the operating water and air te mperatures. This means an ice machine with a 70 ° F (21.2 ° C) ambient temperature and 50 ° F (10.0 ° C) water produces more ice than the same ice machine with 90 ° F (32.2 ° C) ambient and 70 ° F (21.2 ° C) wat er . 1. Determine [...]

58 ADJUSTING CUBE WEIGHT The cube weight can be incre ased from the factory setting by adjusting the finish time. Additional finishing time check: Press and hold the power button for 5 seconds. • Count the flashes on the Automatic Ice Making light. The light will flash once for eac h additional minute of freeze cycle time. Adjusting Fini shing Ti[...]

59 LIQUID LINE THERMISTOR Function The liquid line thermistor sens es the refrigeration system liquid line temperature. This is used in conjunction with the control b oard to determine the length of the freeze and harvest cycles. Specifications 10,000 Ohms ± 2% at 25 ° C (77 ° F) CAUTION Use only Manitowoc thermistors. Check Procedure Verify tha[...]

60 TEMPERATURE/RESISTANCE CHART As the temperature rises at the thermistor block, the resistance drops. IMPORTANT If the ohmmeter reads “OL,” check the scale setting on the meter before assuming the thermistor is bad. SM50 Resistance Chart Temperature of Thermistor Resistance ° C ° F K Ohms (x 1000) 15.6 ° - 21.1 ° 60 ° - 70 ° 15.31 - 11.[...]

61 TOTAL SYSTEM REFRIGERATION CHARGE IMPORTANT This information is for re ference only. Refer to the ice machine serial number tag to verify the system charge. Serial plate informatio n overrides information listed on this pag e. Model Refrigerant Charge (grams) Refrigerant Type CM50 Air Cooled 160 R-134A[...]

62 COMPONENT SPECIFICA TIONS AND CHECK PROCEDURES MAIN FUSE Function The control board fuse stops ice machi ne operation if electrical components fail causing h igh amp draw. Specifications Volt Amp CM50 250 10 Check Procedure WARNING High (line) volt age is applied to the control board at all times. Removi ng the control board fuse or movin g the [...]

63 COMPRESSOR ELECTRICAL DIAGNOSTICS The compressor does not start or will trip repeatedly on overload. CHECK RESISTANCE (OHM) VALUES NOTE: Compressor windings can have v ery low ohm values. Use a properly calibrated meter. Perform the resistance test after the compressor cools. The compressor dome should be coo l enough to touch (below 120 ° F/49[...]

64 COMPRESSOR DRAWING LOCKED ROTOR The two likely causes of this are: • Defective starting component • Mechanically seized compressor To determine which you have: • Install high and low side gauges. • Try to start the compressor. • Watch the pressures closely. If the pressures do not move, the compressor is seized. Replace the compressor.[...]

65 DIAGNOSING START COMPONENTS: If the compressor attempts to start, or hums and trips the overload protector, check the start components before replacing the compressor. CA P A CITOR Visual evidence of capacit or failure can include a bulged terminal end or a ruptu red membrane. Do not assume a capacitor is good if no visual evide nce is present. [...]

66 CYCLE TIMES, 24 HR ICE PRODUCTION AND REFRIGERANT PRESSURE CHARTS These charts are used as guidelines to verif y correct ice machine operation. Accurate collection of data is essential to obtain the correct diagnosis. • Refer to “OPERATIONAL ANALYSIS CHART” for the list of data that must be collected for refrigeration diagnostics. T his li[...]

67 NOTE: THESE CHARACTERISTICS MAY VARY DEPENDING ON OPERATING CONDITIONS. Cycle Times Freeze Time + Harvest Ti me = Cycle Time FREEZE TIME WATER TEMPERATURE ° F/ ° C HARVEST TIME AIR TE MP . ENTERING CONDENSER ° F/ ° C 50/10.0 70/21.1 90/32.2 70/21.1 15.6-17.8 15.3-17 .4 15.6-17.8 80/26.7 16.6-18.9 17.0-19 .4 17.4-19.8 90/32.2 17.4-19.8 19.1-2[...]

68 REFRIGERANT DEFINITIONS Recover To remove refrigerant, in any condition, from a system and store it in an external container, without necessarily testing or proc essing it in any way. Recycle To clean refrigerant for re-use by oil separ ation and single or multiple passes through dev ices, such as replaceable core filter-driers, which reduce moi[...]

69 REFRIGERANT RE-USE POLICY Manitowoc recognizes and supports the nee d for proper handling, re-use, and disp osal of, CFC and HCFC refrigerants. Manitowoc service proced ures require recapturing refrigera n ts, not venting them to the atmosphere. It is not necessary, in or out of warranty, to reduce or compromise the qualit y and reliability of y[...]

70 4. Recovered refrigerant must come from a “contaminant-free” system . To decide whether the system is contaminant free, consider: • Type(s) of previous failure(s) • Whether the system was cleaned, evacuated and recharged prop erly following failure(s) • Whether the system has been contaminated by this failure • Compressor motor burno[...]

71 Refrigerant Reco very/Evacuation/Charging Do not purge refrigerant to the atmosph ere. Capture refrigerant using recovery equipment. F ollow the manufacturer’s recommendations. Install and uninstall your manif old gauge set correctly to prevent refrigerant loss. IMPORTANT Manitowoc Ice, Inc. assumes no responsibility for the use of contaminate[...]

72 IMPORTANT Manifold gauges must be removed prope rly to ensure that no refrigera nt contamination or loss occurs. A quick disco nnect is re quired fo r the high side connection. Recovery/Evacuation 1. Place the toggle switch in the OFF position. 2. Install manifold gauges, charging scale, and recovery unit or two-stage vacuum pump. 3. Open the hi[...]

73 Charging Procedures IMPORTANT The charge is critical on all Manito woc ice machines. Use a scale to ensur e the proper charge is installed. A quick disconn ect is required for the high side connection 1. Be sure the toggle swit ch is in the OFF position. 2. Close the vacuum pump valve and the lo w side manifold gauge valve. 3. Open the high side[...]

74 9. Make sure that all refrigerant in the charging hose is drawn into the ice machine before disco nnecting the manifold gauge set. A. Drain the water from the sump trough. B. Run the ice machine in the freeze c ycle for 5 minutes. C. Remov e the high side hose with the quick disconnect. D. Open the h igh and low side valves on the manifold gauge[...]

75 SYSTEM CONTAMINATION CLEANUP GENERAL This section describes the basic requireme nts for restoring contaminated systems to reliable service. IMPORTANT Manitowoc Ice, Inc. assumes no responsibilit y for the use of contaminated refriger ant. Damage resulting from the use of contaminated refrigera nt is the sole responsibilit y of the servicing comp[...]

76 Contamination/Cleanup Ch art Symptoms/Findings Required Cleanup Procedure No symptoms or suspicion of contamination Normal evacuation/recharging procedure Moisture/Air Contamination symptoms Refrigeration system open to atmosphere for longer than 15 minutes Refrigeration test kit and/or acid oil test shows contamination No burnout deposits in op[...]

77 MILD SYSTEM CONTAMINA TION CLEANUP Procedure 1. Replace any failed components. 2. If the compressor is good, change the oil. 3. Replace the liquid line dr ier. NOTE: If the contamination is from moisture, use heat lamps during evacuation. Position them at the compressor, condenser and evap orator prior to evacuation. Do not position heat l amps [...]

78 SEVERE SYSTEM CONTAMINATION CLEANUP PROCEDURE 1. Remove the refrigerant charge. 2. Remove the compressor. 3. Wipe away any burnout depos its from suction and discharge lines at compressor . 4. Sweep through the open system with dry nitrogen. IMPORTANT Refrigerant sweeps are not recommended, as they release CFC’s into the atmospher e. 5. Instal[...]

79 9. Charge the system with the proper refrigerant to the nameplate charge. 10. Operate the ice machi ne for one hour. Then, check the pressure drop across the suction line filter-drier. a) If the pressure drop is less than 2 psig, the filter-drier should be adequat e for complete cleanup. b) If the pressure drop exceeds 2 psig, change the suction[...]

80 REPLACING PRESSURE CONTROLS WITHOUT REMOVING REFRIGERANT CHARGE This procedure reduces repair time and cost. Use it when any of the following components req uire replacement, and the refrigeration s ystem is operational and leak-free. • Fan cycle control • High pressure cut-out control • High side access valve • Low side access valve IMP[...]

81 Using Pinch Off Tool FIG. A - “PINCHING OFF” TUBING FIG. B - RE-ROUNDING TUBING SV1406[...]

82 BRAZING PROCEDURES FOR DANFOSS SOLENOID VALVES • Danfoss stainless steel solenoid valves requ ire a slightly different brazing technique tha n brass- bodied valves. Copper clad stainless steel does not requir e as much flame contact as copper tubing. Apply heat to the copper tubing first then the solenoid socket. • 15% silver solder is recom[...]

83 4. Apply heat to copper tubing fir st and move flame toward valve socket. A. Heat copper tubing for approximatel y 10 to 15 seconds then direct the heat to the solenoid socket B. Heat the solenoid socket for 2 to 5 seconds and apply silver solder to joint . C. Do not attempt to fill solenoid flange with solder. Solder will draw into socket. 5. I[...]

84 FILTER-DRIERS Liquid Line Fi lter Drier The filter-drier used on Manito woc ice machines are manufactured to Manitowoc specific ations. The difference bet ween a Manitowoc drier and an off- the-shelf drier is in filtration. A Manitowoc drier has dirt- retaining filtration, with fiberglass filters on both the inlet and outlet ends. This is very i[...]

85 THERMISTOR FUSE (7A) BIN LIGHT SWITCH BIN THERMISTAT CONNECTION DISPLAY BOARD CONNECTION BIN LIGHT CONNECTION TRANSFORMER CONTROL BOARD[...]

86 WIRING DI AGRAMS CAUTION: DISCONNECT POWER BEFORE WORKING ON ELECTRICAL CIRCUITRY DIAGRAM SHOWN DURING FREEZE CYCLE L1 (22) BIN LIGHT SWITCH (33) (20) (21) CONTROL BOARD (47) START RELAY (27) HOT GAS SOLENOID WAT ER PUM P (28) (48) (29) (26) TRANS FUSE (7A) (44) FAN MOTOR (43) (46) COMPRESSOR R (24) (25) C L2 DRAIN PUMP WATER INLET (45) (41) (42[...]

87 TUBING SCHEMATIC EVAPORATOR HEAT EX C HAN G ER HOT GAS SOLENOID VALVE CAP TUBE CONDENSER COMPRESSOR DRIER[...]

88 Compact Ice by Manitowoc Manitowoc WI 54221-17 20 Phone: 1-800-235-9698 Website – www.compact-ice.com ©2006 Manitow oc Ice, Inc.[...]