Section, Refrigeration System, Procedure | Manitowoc Ice QF2200

Section 7	Refrigeration System

ANALYZING DISCHARGE PRESSURE DURING FREEZE OR HARVEST CYCLE

Procedure

1. Determine the ice machine operating conditions:

Air temp. entering condenser	______
Air temp. around ice machine	______
Water temp. entering water reservoir	______

2.Refer to Cycle Times/24 Hour Ice Production/ Refrigeration Pressure Chart for ice machine being checked.

Use the operating conditions determined in step 1 to find the published normal discharge pressures. Compare to actual discharge pressure readings.

3.Measure the actual discharge pressure.

4.Compare the actual discharge pressure (step 3) with the published discharge pressure (step 2).

The discharge pressure is normal when the actual pressure falls within the published pressure range for the ice machine’s operating conditions.

Discharge Pressure High Checklist

Possible Cause	Check/Correct

Improper installation	See “Installation/Visual Inspection Checklist”

Restricted condenser air flow	High inlet air temperature
	Condenser discharge air recirculation
	Dirty condenser fins
	Defective fan motor
	Defective fan cycle control (QC700/QF800 only)

Improper refrigerant charge	Overcharged
	Non-condensables in system
	Wrong type of refrigerant

Other	Non-Manitowoc components in system
	High side refrigerant lines/component restricted (before mid-condenser)
	Defective head pressure control valve (RFC2085/RFC2385 only)

Discharge Pressure Low Checklist

Possible Cause	Check/Correct

Improper installation	See “Installation/Visual Inspection Checklist”

Improper refrigerant charge	Undercharged
	Wrong type of refrigerant

Other	Non-Manitowoc components in system
	Defective head pressure control valve (RFC2085/RFC2385 only)
	Defective fan cycle control (QC700/QF800 only)
	Suction pressure is too low and affecting discharge pressure. Refer to
	suction pressure low checklist.
	No water or insufficient pressure
	Starving expansion valve
	Defective compressor
	Moisture in refrigeration system

NOTE: Do not limit your diagnosis to only the items listed in the checklists.

Part No. 80-1214-3	Revised 8/2003	7-7
	Revised 8/2003

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Manitowoc Ice QF2200, QF2300, QF0800, QC0700 Section, Refrigeration System, Procedure, Discharge Pressure High Checklist

Contents

Chiplet Models QC0700 Flake Models QF0400/QF0800 QF2200/QF2300Service Manual Flake / Chiplet Model Ice Machines Procedural Notices Safety NoticesRead These Before Proceeding PERSONAL INJURY POTENTIAL Section Installation Instructions Table of ContentsAccessories Manitowoc Cleaner and Sanitizer Section Maintenance Table of Contents continuedExterior Cleaning Preventative Maintenance Cleaning Procedure Section Troubleshooting Table of Contents continued SectionReset Procedure SafeGuard Indicator Lights Compressor Electrical Diagnostics ICE/OFF/CLEAN Toggle SwitchSection Refrigeration System 6-46 Table of Contents continued Revised 8/2003 How to Read a Model Number Section General InformationAccessories MANITOWOC CLEANER AND SANITIZER Section General InformationModel/Serial Number Location Model/Serial Number Location Warranty Coverage Owner Warranty Registration CardGENERAL PARTS THIS PAGE INTENTIONALLY LEFT BLANK Ice Machine Dimensions Section Installation InstructionsQF400 AIR COOLED ICE MACHINE QC700/QF800 AIR COOLED ICE MACHINE Installation Instructions Ice Machine Head Section Clearance Requirements Location of Ice MachineIce Machine Heat of Rejection Location of Remote Condensing Unit Condenser Air Baffle Leveling the Ice Storage BinQC700/QF800 Air-CooledIce Machines Only Air Baffle VOLTAGE Electrical ServiceFUSE/CIRCUIT BREAKER MINIMUM CIRCUIT AMPACITY For United Kingdom Only Electrical RequirementsIce Machine Head Section Remote Condensing Unit QF2300 ICE MACHINE HEAD SECTION QF2200 ICE MACHINE HEAD SECTION 115/60/1115/60/1 230/1/50 Remote Electrical Wiring Connections RFC2385 REMOTE CONDENSING UNIT 208-230/1/60RFC2085 REMOTE CONDENSING UNIT 208-230/1/60 Cooling Tower Applications Water-CooledModels Ice Machine Head Section Water Supply and DrainsPOTABLE WATER SUPPLY POTABLE WATER INLET LINES Typical Water Supply Drain Installation 2-10WATER SUPPLY AND DRAIN LINE SIZING/CONNECTIONS 2-11 Refrigeration System InstallationQF2200/RFC2085 AND QF2300/RFC2385 ONLY USAGE WITH NON-MANITOWOC CONDENSING UNITS 2-12 Refrigeration Line Set InstallationStep 1 Verify Ice Machine and Remote Condensing Unit Locations Are Within Guidelines 2-13 Service LoopC. SUCTION LINE OIL TRAPS Manitowoc S-TrapKit 2-14 Step 4 Connecting the line set 2-15 2-16 Open Receiver Service ValveTorque Value’s Step 7 Leak Check The Refrigeration System Suction Shut Off Valve Insulation 2-17 2-18 Component Identification Section Ice Machine OperationICE MACHINE HEAD SECTION QC700/QF800 QF400 Section Ice Machine OperationQF2300 RFC2385 Remote Condensing Unit Operational Checks GENERALWATER LEVEL CHECK Cleaning/Sanitizing Procedure Interior Cleaning and SanitizingHeavily Scaled Cleaning Procedure EXTERIOR CLEANING Air-CooledCondenser CLEANING THE CONDENSERSelf-Contained Air-CooledFilter Straighten Bent Condenser Fins MANITOWOC’S CLEANING TECHNOLOGY PREVENTATIVE MAINTENANCE CLEANING PROCEDURE QF400 CLEANING/SANITIZING PROCEDURE QC700/QF800/QF2300 CLEANING/SANITIZING PROCEDURE QF400 3-10 part numberonly 3-11 REMOVAL OF PARTS FOR CLEANING/SANITIZING Water Level Probe Removal 3-12QC700/QF800 Water Reservoir Cover Removal 3-13 QF2300 ShownFloat Valve Removal 3-14 Water Reservoir RemovalIce Diverter Removal Ice Chute Removal 3-15 3-16 Bin Door RemovalCabinet Removal Dump Valve Disassembly 3-17Water Dump Valve 3-18 Removal from Service/WinterizationWATER COOLED CONDENSING UNIT Pry Open the Water Regulating Valve QF400/QC700/QF800 Section Ice Machine Sequence of OperationPRIOR TO START-UP INITIAL START-UP1A. Flush QF2200 Ice Machine Sequence of OperationRemote Condensing Unit 2. Freeze Remote Condensing Unit 3. Automatic Shut-Off QF2300 THIS PAGE INTENTIONALLY LEFT BLANK Checklist Section Troubleshooting Safeguard Feature TroubleshootingRESET PROCEDURE SAFEGUARD INDICATOR LIGHTS Analyzing Why SafeGuards May Stop the Ice Machine TroubleshootingSAFEGUARD MODES No Water No Water Checklist Gear Motor Speed Gear Motor Speed Checklist Temperature is Too High or Low QF400/QC700/QF800 Temperature Sensor Checklist QF400/QC700/QF800 Temperature is Too High or Low QF2200 Only Temperature Sensor Checklist QF2200 Gear Box Removal QF2200/QF2300 Evaporator Removal 5-10 Energized Parts Charts Section Electrical System Electrical System Section Wiring Diagram Sequence of OperationL1 1B. WATER FILL Freeze Cycle Automatic Shut-Off 3B. DRAIN EVAPORATOR Section 6-10 Wiring Diagram Sequence of L1 Operation 6-11 6-12 6-13 6-14 6-15 6-16 RFC2085 Initial Start-Up Remote Condensing Unit 6-17 Initial Start-Up 6-18 RFC2085 Initial Start-Up 6-19 6-20 RFC2085 Freeze Cycle 6-21 QF2200 Automatic Shut-Off 6-22 RFC2085 Automatic Shut-Off 6-23 6-24 8 Minute Lockout 6-25 6-26 Wiring Diagram Sequence of Operation RFC2385 6-27 6-28 6-29 6-30 6-31 6-32 6-33 QF2300 Automatic Shut-Off 6-34 6-35 Wiring Diagrams WIRING DIAGRAM LEGEND6-36 6-37 ICE MACHINE HEAD SECTION QF400115V/60Hz/1Ph - 230V/50Hz/1Ph QC700/QF800 115V/60Hz/1Ph - 230V/50Hz/1Ph 6-38 6-39 COMPRESSOR SECTION QC700/QF800115/60/1 - 230/50/1 ICE MACHINE HEAD SECTION QF2200 6-40 RFC2085 230V/60HZ/1PH - 230/50/1 6-41 RFC2085 208-230V/60HZ/3PH 6-42 Diagram Shown During Freeze Cycle 6-43ICE MACHINE HEAD SECTION RFC2385 230V/60HZ/1PH - 230/50/1 6-44 RFC2385 208-230V/60HZ/3PH 6-45 6-46 Control Board ICE/OFF/CLEAN TOGGLE SWITCH Function Component Specifications and DiagnosticsSpecifications Check Procedure 6-48 6-49 MOTOR SPEED SENSOR FunctionFailure Modes WATER LEVEL PROBES Function 6-50 6-51 6-52 TEMPERATURE SENSOR FunctionTEMPERATURE/RESISTANCE CHART 6-53 CONTROL BOARD RELAYS FunctionMAIN FUSE Function 6-54 WATER FLOAT VALVE FunctionWATER LEVEL CHECK 6-55 HIGH PRESSURE CONTROL HPCO FunctionFunction FAN CYCLE CONTROL Function 6-56 6-57 COMPRESSOR ELECTRICAL DIAGNOSTICSCheck Resistance Ohm Values Check Motor Windings to Ground 6-58 Diagnosing Start ComponentsRelay Operation Check Diagnosing A Condensing Unit That Will Not Run Diagnosing An Ice Machine That Will Not Run6-59 QF400/QC700/QF800/QF2200/QF2300 6-60 Section Refrigeration System Tubing SchematicSV3082 Refrigeration System QF2200/RFC2085Condensing Unit QF2300/RFC2385 Refrigeration System Diagnostics BEFORE BEGINNING SERVICE ICE PRODUCTION/QUALITY CHECK Quality CheckIce Production Check INSTALLATION/VISUAL INSPECTION CHECKLIST WATER SYSTEM CHECKLISTSAFEGUARDS Procedure Discharge Pressure High ChecklistDischarge Pressure Low Checklist Suction Pressure High Checklist Suction Pressure Low ChecklistANALYZING SUCTION PRESSURE Normal Operation EQUALIZATION VALVE QF2300 GeneralAnalysis WATER REGULATING VALVE WATER-COOLEDMODELS ONLY HEADMASTER CONTROL VALVE Function 7-10FREEZE CYCLE OPERATION Air-CooledIce Machines Air-CooledCondensing Units QF400 SELF-CONTAINEDAIR COOLED 7-1124 Hour Ice Production Operating Pressures 7-12 QC700 SELF-CONTAINEDAIR COOLEDQC700 SELF-CONTAINEDWATER COOLED 7-13 QF800 SELF-CONTAINEDAIR COOLEDQF800 SELF-CONTAINEDWATER COOLED 7-14 QF2200/RFC2085 REMOTE AIR COOLEDQF2300/RFC2385 REMOTE AIR COOLED REFRIGERANT RECOVERY/EVACUATION Refrigerant Recovery/Evacuation and RechargingNormal Self-ContainedModel Procedures Recovery/Evacuation Connections Recovery/Evacuation QF2200/QF2300 7-16Connections Self-ContainedModel Charging Procedures 7-17Charging Connections 7-18 Remote Charging Procedures QF2200/QF2300 SYSTEM CONTAMINATION CLEAN-UP General 7-19Determining Severity Of Contamination Mild System Contamination Cleanup Procedure Severe System Contamination Cleanup Procedure7-20 7-21 Using Pinch-OffTool 7-22SV1406 7-23 SUCTION CLEAN-UPFILTER/DRIER QF400/QC700/QF800FILTER-DRIERS Liquid Line Filter Drier Remote Models New Product Specifications REFRIGERANT DEFINITIONS Recover7-24 Recycle Revised 8/2003 Attend A Manitowoc Factory Service School 7-25 3.Recovered or Recycled RefrigerantREFRIGERANT RE-USEPOLICY 1.New Refrigerant 7-26