Table of Contents
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Installation and
Operations Manual
H-IM-CU
August 2008
Part No. 25008101
Replaces None. Information formerly included in H-IM-64L.
Condensing
Units
Table of Contents
General Safety Information...............................................................................2
Inspection ...............................................................................................................2
Warranty Statement ............................................................................................2
Space and Location Requirements ...............................................................3
Remote and Water Cooled Condensing Units Requirements ..............4
City & Tower Water Connections .....................................................................4
Condensing Unit Rigging and Mounting ....................................................5
Head Pressure Control ........................................................................................6
Refrigerant Oils ......................................................................................................7
Phase Loss Monitor ..............................................................................................8
Recommended Refrigerant Piping Practices .............................................8
Refrigeration Pipe Supports ............................................................................8
Suction Lines ..........................................................................................................8
Liquid Lines ............................................................................................................9
Hot Gas Defrost Systems ...................................................................................9
Unit Cooler Piping ............................................................................................. 10
Line Sizing Tables ........................................................................................10-13
Evacuation and Leak Detection ................................................................... 14
Refrigerant Charging Instructions ............................................................... 14
Field Wiring .......................................................................................................... 14
Check Out and Start Up .................................................................................. 15
Operational Check Out .................................................................................... 16
System Balancing - Compressor Superheat ............................................. 16
General Sequence of Operation .................................................................. 17
Electric Defrost Troubleshooting ................................................................. 17
System Troubleshooting Guide .................................................................... 18
Preventive Maintenance Guidelines ........................................................... 19
Typical Wiring Diagrams ...........................................................................20-23
InterLink™ Replacement Parts ...................................................................... 24
H-IM-CU-0808 | Version 000
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Summary of Contents for Heatcraft Refrigeration Products Condensing Units H-IM-CU
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Page 1: Table Of Contents
Installation and Operations Manual H-IM-CU August 2008 Part No. 25008101 Replaces None. Information formerly included in H-IM-64L. Condensing Units Table of Contents General Safety Information...2 Inspection ...2 Warranty Statement ...2 Space and Location Requirements ...3 Remote and Water Cooled Condensing Units Requirements ...4 City & Tower Water Connections ...4 Condensing Unit Rigging and Mounting ...5 Head Pressure Control ...6 Refrigerant Oils ...7... -
Page 2: General Safety Information
Heatcraft Refrigeration Products Warranty Claims for reimbursement. Seller makes no express warranties except as noted above. All implied warranties are limited to the duration of the Express Warranty. -
Page 3: Space And Location Requirements
Space and Location Requirements for Air Cooled Condensing Units and Remote Condensers The most important consideration which must be taken into account when deciding upon the location of air-cooled equipment is the provision for a supply of ambient air to the condenser, and removal of heated air from the condensing unit or remote condenser area. Where this essential requirement is not adhered to, it will result in higher head pressures, which cause poor operation and potential failure of equipment. -
Page 4: Remote And Water Cooled Condensing Units Requirements
Requirements for Remote and Water Cooled Condensing Units General Installation The indoor compressor units are designed to be used with a remote condenser. The water cooled units are similar, except that they have an integral water cooled condenser. Inlet and outlet water connections are to be made in the field. On units having a compressor water jacket, incoming water shall be routed through the jacket prior to entering the condenser. -
Page 5: Condensing Unit Rigging And Mounting
Condensing Unit Rigging and Mounting Rigging holes are provided on all units. Caution should be exercised when moving these units. To prevent damage to the unit housing during rigging, cables or chains used must be held apart by spacer bars. The mounting platform or base should be level and located so as to permit free access of supply air. -
Page 6: Head Pressure Control
Head Pressure Control Several types of head pressure control systems are available on condensing units: Dual Valve System. (See section on operation and adjustment.) Single Valve system. No adjustments are necessary. (See section on operation.) Ambient Fan Cycle Control. (See section on operation and adjustment.) A. Dual Valve System The system employs an ORI (open on rise of inlet pressure) valve and an ORD... -
Page 7: Refrigerant Oils
Refrigeration Oils* With the changes that have taken place in our industry due to the CFC issue, we have reevaluated our lubricants to ensure compatibility with the new HFC refrigerants and HCFC interim blends offered by several chemical producers. As a secondary criteria, it is also desirable that any new lubricant be compatible with the traditional refrigerants such as HCFC-22 or R502. -
Page 8: Phase Loss Monitor
Phase Loss Monitor The combination phase sequence and loss monitor relay protects the system against phase loss (single phasing), phase reversal (improper sequence) and low voltage (brownout). When phase sequence is correct and full line voltage is present on all three phases, the relay is energized as the normal condition indicator light glows. -
Page 9: Liquid Lines
Liquid Lines Liquid lines should be sized for a minimum pressure drop to prevent “flashing”. Flashing in the liquid lines would create additional pressure drop and poor expansion valve operation. If a system requires long liquid lines from the receiver to the evaporator or if the liquid has to rise vertically upward any distance, the losses should be calculated to determine whether or not a heat exchanger is required. -
Page 10: Unit Cooler Piping
Unit Cooler Piping Pipe size example: Given: -10°F Freezer with one system having (2) evaporators • One condensing unit rated at 24,000 BTUH’s @ -20°F SST R404A refrigerant. • Two evaporators each rated at 12,000 BTUH’s @ 10°F TD. • 100 feet of actual line run between condensing unit to first evaporator and 20 feet of actual line run between the first evaporator and the second evaporator (see figure below). - Page 11 Table . Pressure Loss of Liquid Refrigerants in Liquid Line Risers (Expressed in Pressure Drop, PSIG, and Subcooling Loss, ˚F) Refrigerant 15' PSIG ˚F PSIG ˚F R507, R404A Based on 110˚F liquid temperature at bottom of riser. Table 5. Equivalent Feet of Pipe Due to Valve and Fitting Friction Copper Tube, O.D., Type “L” Globe Valve (Open) Angle Valve (Open) 90˚ Turn Through Tee Tee (Straight Through) or Sweep Below 90˚...
- Page 12 Table 7. Recommended Line Sizes for R-22 * Capacity +0˚F +20˚F BTUH Equivalent Lengths Equivalent Lengths 25' 50' 100' 150' 25' 50' 100' 150' 25' 50' 100' 150' 25' 50' 100' 150' 25' 50' 100' 150' 25' 50' 100' 150' 25' 50' 100' 150' 1,000 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 1/2 3/8 3/8 3/8 1/2 3/8 3/8 1/2 1/2 3/8 3/8 3/8 3/8 3,000 3/8 3/8 1/2 1/2 3/8 1/2 1/2 5/8 3/8 1/2 1/2 5/8 1/2 1/2 5/8 5/8 1/2 1/2 5/8 5/8 1/2 1/2 5/8 5/8 3/8 3/8 3/8 3/8 4,000...
- Page 13 Table 8. Recommended Line Sizes for R-0A and R507* Capacity +20˚F +10˚F BTUH Equivalent Lengths Equivalent Lengths 25' 50' 100' 150' 25' 50' 100' 150' 25' 50' 100' 150' 25' 50' 100' 150' 25' 50' 100' 150' 25' 50' 100' 150' 25' 50' 100' 150' 1,000 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 3/8 1/2 1/2 3/8 3/8 1/2 1/2 3/8 3/8 1/2 1/2 3/8 1/2 1/2 5/8 3/8 3/8 3/8 3/8 3,000 3/8 3/8 1/2 1/2 3/8 1/2 1/2 5/8 1/2 1/2 5/8 5/8 1/2 1/2 5/8 7/8 1/2 1/2 5/8 7/8 1/2 1/2 5/8 7/8 3/8 3/8 3/8 3/8 4,000...
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Page 14: Evacuation And Leak Detection
Evacuation and Leak Detection Due to the smaller molecule size of HFC’s, they will tend to leak more readily than CFC’s. Consequently, it is of the utmost importance that proper system evacuation and leak detection procedures be employed. Copeland recommends a minimum evacuation to 500 microns. In addition, a vacuum decay test is strongly recommended to assure there is not a large pressure differential between the system and vacuum pump. -
Page 15: Check Out And Start Up
Check Out and Start Up After the installation has been completed, the following points should be covered before the system is placed in operation: Check all electrical and refrigerant connections. Be sure they are all tight. Observe compressor oil level before start-up. The oil level should be at or slightly above the 1/4 level of the sight glass. -
Page 16: Operational Check Out
Operational Check Out After the system has been charged and has operated for at least two hours at normal operating conditions without any indication of malfunction, it should be allowed to operate overnight on automatic controls. Then a thorough recheck of the entire system operation should be made as follows: Check compressor discharge and suction pressures. -
Page 17: Refrigeration/Defrost Cycle
General Sequence of Operation Refrigeration Cycle Power is supplied to the timer at terminals “1” and “N”. The fan delay and the defrost termination thermostat is closed in the fan delay position and open in the defrost termination position. The unit cooler fans run continuously. The defrost heaters are off. -
Page 18: System Troubleshooting Guide
Table 10. System Troubleshooting Chart PROBLEM POSSIBLE CAUSES Compressor will not 1. Main switch open. 2. Fuse blown. 3. Thermal overloads tripped. 4. Defective contactor or coil. 5. System shut down by safety devices. 6. No cooling required. 7. Liquid line solenoid will not open. 8. -
Page 19: Preventive Maintenance Guidelines
Preventive Maintenance Unit Coolers At every six month interval, or sooner if local conditions cause clogging or fouling of air passages through the finned surface, the following items should be checked. 1) Visually inspect unit • Look for signs of corrosion on fins, cabinet, copper tubing and solder joints. -
Page 20: Typical Wiring Diagrams
Diagram . Typical Wiring Diagram for Single Evaporator with and without Defrost Timer Diagram . Typical Wiring Diagram for Single Evaporator with Defrost Timer Only... - Page 21 Diagram 5. Typical Wiring Diagram for Multiple Evaporators with Defrost Timer Only Diagram . Typical Wiring Diagram for Single Evaporator / Single Phase Defrost and Evaporator Fan Contactors...
- Page 22 Diagram 7. Typical Wiring Diagram for Single Evaporator Defrost and Evaporator Fan Contactors Diagram 8. Typical Wiring Diagram for Multiple Evaporators with Evaporator Fan Contactors/without Heater Limit Defrost...
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Page 23: Typical Wiring Diagrams
Diagram 9. Typical Wiring Diagram for Multiple Evaporators with Heater Limit Defrost and Evaporator Fan Contactors Diagram 10. Typical Wiring Diagram for Multiple Evaporators Defrost and Evaporator Fan Contactors with Unit Cooler Holdout Relay... -
Page 24: Interlink™ Replacement Parts
InterLink™ Comercial Refrigeration Parts is your link to a complete line of dependable and certified commercial refrigeration parts, accessories and innovative electronic controls for all Heatcraft Refrigeration Products (HRP) brands - including Bohn, Larkin, Climate Control and Chandler. At InterLink, we provide our wholesalers with a comprehensive selection of product solutions and innovative technologies for the installed customer base.
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Questions and answers
Having issues with condenser. Wont start up unless phase monitor is bypassed.
The cause could be that the supplied electrical current is not in phase with the phase monitor. If the compressor fails to operate and the normal condition indicator light on the phase monitor does not glow, this indicates a phase issue. This problem can be corrected by rewiring for proper phase sequence.
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