Heatcraft Refrigeration Products Condensing Units H-IM-CU manuale d’uso

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 qualied 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. 1. 2. W ARNING: Refr igerant can be harmful if it is inhaled. Refrigera[...]

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. Where this essential requirement is n[...]

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 . Inlet and outlet water connections are to be made in the eld. On units having a compr e[...]

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 . Caution should be exer cised when moving these units. T o prevent damage to the unit housing during rigging, cables or chains used must be held apart by spacer ba[...]

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 . CAUTION: F ans closest to the headers should not be c ycl[...]

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. A s a secondary criteria, it is also desirable that any new lubricant be compatible with the t[...]

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. W hen multiple evaporators are c onnected in series using a common suction line, the branch s[...]

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. If a system r equires long liquid lines from the receiv er to the evaporator or if the liquid has to rise v ertically upward an y distance, the[...]

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. • T wo evaporators each rated at 12,000 BTUH ’ s @ 10°F TD . • 100 feet of actual line run between condensing unit to rst evaporat or and 20 feet of actual line run between[...]

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 4.8 1.6 7.[...]

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 Equivalent Lengths +10˚F Equivalent Lengths 0˚F Equivalent Lengths -10˚F Equivalent Lengths -20˚F Equivalent Lengths 25' 50' 100' 150[...]

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 engths +10˚F Equivalent L engths -10˚F Equivalent L engths -20˚F Equivalent L engths -30˚F Equivalent L engths -40˚F Equivalent L engths 25' 50&[...]

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. Copeland recommends a minimum evacua tion to 500 microns. In addition, a vacuum decay test is str[...]

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. The oil level should be at or slightly abov e the 1/4 level of the sight[...]

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. The critical value which must be checked is suction superheat. Suction superheat should be[...]

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 . Before replacing timer , check other components. Operation of P aragon T imer T o set[...]

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 . 6. No cooling r equired. 7. Liquid line solenoid will not open. 8. Motor electrical tro[...]

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 . Repair any leaks found and add refrigerant as need[...]

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 Contactors[...]

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/without Heat er Limit Defrost[...]

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 with Heater Limit Defr ost and Evapor ator F an Contactors[...]

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