Manual do usuário Heatcraft Refrigeration Products Unit Coolers H-IM-UC

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Installationand
Operations Manual
H-IM-UC August2008 PartN o. 25008201
Replaces None. Information formerly included in H-IM-64L
Unit Coolers
Tableof Contents
General Safety Information .................................................................. 2 Check Out and Start Up ......................................................................... 5
Inspection ................................................................................................ 2 Operational Check Out

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Installation and Operations Manual General Safety Information 3. Make sure that all field wiring conforms to the requirements 1. Installation and maintenance to be performed only of the equipment and all applicable national and local codes. by qualified personnel who are familiar with this type of equipment 4. Avoid contact with sharp edges and coil surfaces. They are a potential injury hazard. 2. Some units are pressurized with dry air or inert gas. All units must be

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Unit Coolers Recommended UnitC oolerPlac ement Some general rules for evaporator placement which must be followed are: 1. The air pattern must cover the entire room. The size and shape of the storage will generally determine the 2. NEVER locate evaporators over doors. type and number of evaporators to be used and their location. 3. Location of aisles, racks, etc. must be known. The following are some typical examples: 4. Location relative to compressors for minimum pipe runs

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Installation and Operations Manual Unit Cooler Mounting Most evaporators can be mounted with rod hangers, lag screws, or the area above the unit cooler must be sealed or exposed in such a way bolts. Use 5/16" bolt and washers or rod for up to 250 pounds, 3/8" to facilitate hand cleaning without the use of tools. When lagging or for up to 600 pounds and 5/8" for over 600 pounds. Care should be bolting the unit flush to the ceiling, seal the joint between the top and taken to mount the units l

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Unit Coolers Condensate DrainLines Field Wiring Either copper or steel drain lines should be used and properly protected from freezing. In running drain lines, provide a minimum 1/4 inch per WARNING: Allwiring mustb e donein accordance with foot pitch for proper drainage. Drain lines should be at least as large applicable codesand lo cal ordinances. as the evaporator drain connection. All plumbing connections should be made in accordance with local plumbing codes. All conden

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Installation and OperationsM anual Operational CheckO ut Alternative Superheat Method The most accurate method of measuring superheat is found by After the system has been charged and has operated for at least following the previous procedure, Temperature/Pressure method. two hours at normal operating conditions without any indication of However, that method may not always be practical. An alternative malfunction, it should be allowed to operate overnight on automatic method which wil

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Unit Coolers Table1. Expansion Valve Selection For 100# Head Pressure Valve R-507/R 0  A  R-507/R0  A  R-22 R-22 BTUHa tab out -20˚F/-29˚CE vap. +25˚F/- ˚C Evap. -20˚F/-29˚C Evap. +25˚F/- ˚CE vap. 10° T.D. Sporlan ALCO Sporlan ALCO Sporlan ALCO Sporlan ALCO 3,000-5,000 EGSE 1/2 ZP HFESC-1/2-RZ EGSE 1/2 C HFESC-1/2-RC EGVE 1/2 Z HFESC-1-HZ EGVE 1/2 C HFESC-1/2-HC 5,500-7000 EGSE 1/2 ZP HFESC-1/2-RZ EGSE 1 C HFESC-1/2-RC EGVE 1 ZP HFESC-1-HZ EGVE 1 C HFESC-1-HC

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Table.  Evaporator TroubleshootingC hart SYMPTOMS POSSIBLE CAUSES POSSIBLE CORRECTIVE STEPS Fan(s) will not operate. 1. Main switch open. 1. Close switch. 2. Blown fuses. 2. Replace fuses. Check for short circuits or overload conditions. 3. Defective motor. 3. Replace motor. 4. Defective timer or defrost thermostat. 4. Replace defective component. 5. Unit in defrost cycle. 5. Wait for completion of cycle. 6. Coil does not get cold enough to reset thermostat. 6. Adjust fan delay setting o