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H-IM-CU August 2008 P ar t No . 25008101 H-IM-CU-0808 | V ersion 000 C ondensing Units Installation and Opera tions Manual T able of C ontents General Safety Information...............................................................................2 Inspection .
2 General Safety Information Installation and maintenance to be performed only by qualied personnel who are familiar with this type of equipment. Some units are pressurized with dry air or iner t gas. All units must be evacuated befor e charging the system with r efrigerant.
3 © 2008 Heatcraft Refrigeration Products LL C 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 fr om the condensing unit or remote c ondenser area.
4 Requirements for Remot e and Wa ter Cooled Condensing Units General Installation The indoor compressor units ar e designed to be used with a remote condenser . T he water cooled units are similar , except that they have an integral wat er cooled condenser .
5 Figur e 3. Spring Mount Figur e 5. Spring Mount Figur e 4. Solid Mount for Mobile or Deep Sump Application Condensing Unit Rigging and Mounting Rigging holes are provided on all units .
6 CAUTION: Under no circumstance should all condenser motors be allo wed to cycle o on one control . At least one motor shall be wired t o operate at all times. Under most circumstances, the c ondenser motor nearest the inlet header should remain on whenev er the compressor is operating .
7 Refrigeration Oils* With the changes that hav e taken place in our industry due to the CFC issue, we hav e reevaluated our lubricants t o ensure compatibility with the new HFC refrigerants and HCFC interim blends o ered by several chemical producers.
8 Figur e 9. Example of Pipe Support Figur e 10. Condensing Unit / C ompressor to W all Suppor t Suction Lines Horizontal suction lines should slope away from the evapor ator towar d the compressor at the rat e of 1/4 inch per 10 feet for good oil r eturn.
9 Liquid Lines Liquid lines should be sized for a minimum pressur e drop to prev ent “ashing” . Flashing in the liquid lines would creat e additional pressure drop and poor expansion valve operation.
10 Pipe size example: Given: -10°F Fr eezer with one system having (2) ev aporators • One condensing unit rated at 24,000 B TUH’ s @ -20°F SST R404A refrigerant.
11 T able 4. Pressure L oss of Liquid Refrigerants in Liquid Line Risers (Expressed in Pr essure Drop , PSIG, and Subcooling Loss, ˚F) Refrigerant Liquid Line Rise in Feet 10' 15' 20' 25' 30' 40' 50' 75' 100' PSIG ˚F PSIG ˚F PSIG ˚F PSIG ˚F PSIG ˚F PSIG ˚F PSIG ˚F PSIG ˚F PSIG ˚F R22 4.
12 T able 7. Recommended Line Sizes for R-22 * Capacity BTUH Suction Line Size Liquid Line Size Suction T emperature Receiver to Expansion V alve Equivalent Lengths +40˚F Equivalent Lengths +20˚F Eq.
13 T able 8. Recommended Line Sizes f or R-404A and R507* Capacity BTUH Suction Line Size Liquid Line Size Suction T emperature Receiver to Expansion V alve Equivalent Lengths +20˚F Equivalent L engt.
14 Evacua tion and Leak Detection Due to the smaller molecule size of HFC’ s, they will tend to leak more r eadily than CFC’ s. Consequently , it is of the utmost impor tance that proper system evacuation and leak detection procedures be emplo yed.
15 Check Out and Start Up After the installation has been completed, the f ollowing points should be cover ed before the syst em is placed in operation: Check all electrical and refrigerant connections. Be sure they are all tight. Observe compressor oil level befor e start-up.
16 Sy stem Balancing - Compr essor Superheat IMPORT ANT: In order to obtain the maximum capacity from a system, and to ensur e trouble-free operation, it is necessary to balance each and every system. This is extremely important with any refrigeration system.
17 Electric Defrost T roubleshooting The electric defrost units are relativ ely simple and trouble-free in operation: Timer If the system does not go through its proper sequence , check timer operation through a defrost cycle . Check for loose wires or terminals .
18 T able 10. System T roubleshooting Chart PROBLEM POSSIBLE CA USES POSSIBLE C ORREC TIVE STEPS Compressor will not run 1. Main switch open. 2. F use blown. 3. Thermal ov erloads tripped. 4. Defective con tactor or coil. 5. Sy stem shut down by safety devices .
19 Air-Cooled C ondensing Units Quarterly 1) Visually inspect unit • Look for sig ns of oil stains on interconnection piping and condenser coil. P ay close attention t o areas around solder joints , building penetrations and pipe clamps. Check an y suspect areas with an electronic leak detector .
20 Diagram 3. T ypical W iring Diagram for Single Evapora tor with and without Defrost Timer Diagram 4. T ypical W iring Diagram for Single Evapora tor with Defrost Timer Only.
21 Diagram 5. T ypical W iring Diagram for Multiple Evapora tors with Defrost Timer Only Diagram 6. T ypical W iring Diagram for Single Evapora tor / Single Phase Defrost and E vaporat or F an Contact.
22 Diagram 7. T ypical W iring Diagram for Single Evapora tor Defrost and E vaporat or F an Contactors Diagram 8. T ypical W iring Diagram for Multiple Evapora tors with Ev aporator F an Contactors/wi.
23 Diagram 10. T ypical W iring Diagram for Multiple Evapora tors Defrost and E vaporat or F an Contactors with Unit Cooler Holdout Rela y Diagram 9. T ypical W iring Diagram for Multiple Evapora tors.
Since product improv ement is a continuing eort, we reserve the right to make changes in specications without notice. C L I M A T E C O N T R O L Commercial Refrigeration Parts The name behind the brands you trust.
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