Instruction/ maintenance manual of the product H-IM-CU Heatcraft Refrigeration Products
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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.
An important point after buying a device Heatcraft Refrigeration Products H-IM-CU (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Heatcraft Refrigeration Products H-IM-CU yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Heatcraft Refrigeration Products H-IM-CU - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Heatcraft Refrigeration Products H-IM-CU you will learn all the available features of the product, as well as information on its operation. The information that you get Heatcraft Refrigeration Products H-IM-CU will certainly help you make a decision on the purchase.
If you already are a holder of Heatcraft Refrigeration Products H-IM-CU, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Heatcraft Refrigeration Products H-IM-CU.
However, one of the most important roles played by the user manual is to help in solving problems with Heatcraft Refrigeration Products H-IM-CU. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Heatcraft Refrigeration Products H-IM-CU along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
