Heatcraft Refrigeration ProductsメーカーH-IM-72Aの使用説明書/サービス説明書
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1 H-IM-72B October 1999 Part No. 25000102 H EATCRAFT I NC . R EFRIGERATION P RODUCTS D IVISION 2175 W EST P ARK P LACE B LVD ., S TONE M OUNTAIN , GA 30087 • 770-465-5600 • F AX 770-465-6016 WWW . HEATCRAFTRPD . COM • E - MAIL : HRPD . FEEDBACK @ HEATCRAFT .
2 © Heatcraft 1999 Table of Contents Introduction Inspection Unit Designation Model Definition ................................................................................ 3 System W arranty Rigging Location of Equipment - INDOOR Clearances Floor & Foundation Requirements Vibration Mounts Figure 1.
3 HEATCRAFT INC. Parallel Compressor Units INTRODUCTION Parallel Compressor systems are central refrigeration units employing 2 to 8 parallel piped compressors, a control panel, and receiver mounted on one common base frame. The system may be designed for either Indoor or Outdoor use.
4 Figure 2. Vibration Pad Locations SYSTEM WARRANTY This equipment is designed to operate properly and produce the rated capacity when installed in accordance with good refrigeration practice. The following conditions should be adhered to when installing this unit to maintain the manuf acturers warranty .
5 LOCATION OF EQUIPMENT - OUTDOOR • The mounting platform or base should be lev el and located so as to permit free access of supply air. • Units must not be located in the vicinity of steam, hot air or fume exhausts. • The unit should be mounted awa y from noise sensitive spaces such as offices.
6 UNIT ACCESS Alwa ys provide sufficient clearance f or unit maintenance and service. Minimum clearances for most situations are described below (except 60 Inches of free space is required in front of the control panel). Please note that these are minimums and more clearance may be required by local codes.
7 Ventilation Requirements INDOOR UNITS If compressors or condensing units are located in a machine room, adequate ventilation air must be provided to avoid an e xcessive temperature rise in the room. T o allow f or peak summer temperatures a 10 ° F temperature rise is recommended, although a 15 ° F rise might be acceptable.
8 • When brazing refrigerant lines, an inert gas should be passed through the line at low pressure to prevent scaling and oxidation inside the tubing. Dry nitrogen is preferred. • Use long radius ell’ s f or lower pressure drop . • Provide expansion loops in long straight refrigerant lines that are subject to expansion and contraction.
9 In order to compensate for the expansion of the tubing, it is necessary to estimate the amount of expansion and then provide offsets or loops in the refrigerant piping. Normally the area to be most concerned with is the straight line distance from the fixture to the parallel compressor unit.
10 T able 3. Equivalent Feet of Pipe (Due to V alve and Fitting F riction) Copper T ube , O .D., T ype "L" 1 / 2 5 / 8 7 / 8 1 1 / 8 1 3 / 8 1 5 / 8 2 1 / 8 2 5 / 8 3 1 / 8 3 5 / 8 4 1 / 8 5.
11 T able 4. W eight of Refrig erants in Copper Lines During Operation (Pounds per 100 Lineal feet of type "L" tubing.) Line Size Suction Line at Suction T emperature O.D. Liquid Hot Gas in Inches Refrigerant Line Line -40 ° F -20 ° F0 ° F +20 ° F +40 ° F 12, 134a 4.
12 T able 5A. Recommended Line Sizes for R-404A and R507 * SUCTION LINE SIZE SUCTION TEMPERATURE SYSTEM +20 ˚ F +10 ˚ F- 1 0 ˚ F- 2 0 ˚ F CAPACITY Equivalent Lengths Equivalent Lengths Equivalent .
13 T able 5B. Recommended Line Sizes for R-404A and R507 (continued) * SUCTION LINE SIZE LIQUID LINE SIZE SUCTION TEMPERATURE Receiver to -20 ˚ F -30 ˚ F -40 ˚ F Expansion Valve SYSTEM Lengths Equi.
14 T able 6A. Recommended Line Sizes for R-22 * SUCTION LINE SIZE SUCTION TEMPERATURE SYSTEM +40 ˚ F +20 ˚ F +10 ˚ F0 ˚ F CAPACITY Equivalent Lengths Equivalent Lengths Equivalent Lengths Equivale.
15 T able 6B. Recommended Line Sizes for R-22 (continued) * SUCTION LINE SIZE LIQUID LINE SIZE SUCTION TEMPERATURE Receiver to 0 ˚ F -10 ˚ F -20 ˚ F Expansion Valve SYSTEM Lengths Equivalent Length.
16 3,000 6,000 9,000 12,000 18,000 24,000 36,000 48,000 60,000 T able 7. Recommended Remote Condenser Line Sizes R-12 & R-134a R-22 R-502 R507 & R-404A Liquid Line Liquid Line Liquid Line Liquid Line Net Total Discharge Cond. to Discharge Cond.
17 Leak Checking, Evacuation, and Start-up W arning: It is illegal to knowingly vent or discharge any CFC’ s and HCFC’ s to the atmosphere. ALL CFC’ s and HCFC’ s must be reclaimed or recycled. Leak Check 1. T o check the systems f or leaks, leav e all valv es closed on suction, liquid and hot gas manif olds.
18 Refrigerant Distribution The distribution system is selected based upon the type of defrost for that particular system. For each set of liquid / suction lines a distribution system must be selected. Liquid solenoids are recommended to be installed at the evaporator on all systems, particularly systems with long line runs.
19 Electronic control system The electronic controller has become the standard on parallel compressor systems. The increased capabilities of the controllers magnify the efficiency of the parallel compressor system making it a very attractive accessory item.
20 T able 11. Oil Saf ety Switch Pressure Alarm Copeland MFGRS. Model No. Diff. Psi (bar) Circuit Part No. Cut-In Cut-Out Sentronic 7 – 9 12 - 14 Y e s 085-0062-00 Penn P45NCA-12 No Ranco P30-5826 Y.
21 T able 12. Oil Charges Model Standard Deep Sump Family Initial (oz) Recharge (oz) Initial (oz) Recharge (oz) 2D 80 72 1 10 95 3D 1 1 5 105 190 170 4DA3-100E 140 130 - - 4DL3-150E 135 120 250 235 4D.
22 T able 14. Oil Saf ety Switch Pressure Carlyle Danfoss Time Diff. Psi (bar) Part No. Part No. Delay Cut-In Cut-Out Reset 634-2008 OR 60B2101 P529-2130 45 sec. 8 – 11 4 - 8 Manual 634-2050 (.55 - .76) (.28 - .55) OR 60B2151 P529-2100 Pressure Carlyle Johnson Time Diff.
23 Sight Glass & Moisture Indicator The sight glass/moisture indicator helps determine that a unit has sufficient refrigerant charge and/or when the liquid line filter drier cores need to be replaced. Bubbles in the glass may indicate a shortage of refrigerant or a restriction in the liquid line (i.
24 T able 17. Henry Relief V alve Capacity Ratings P ounds of Air per Minute for all Refrigerants Except Ammonia R717 TYPE CA T ALOG SIZE CONNECTION ST AND ARD PRESSURE SETTINGS PSIG NUMBER INLET OUTLET 350 400 425 450 ANGLE 526E 3/8 M.P .T . 3/8 FLARE 10.
25 Series P100 Pressure Control The P100 series, manufactured by Johnson Control, Inc., are encapsulated, non adjustable, single-pole single thro w , direct mount pressure controls typically used for low or high pressure cutouts. On the Heatcraft manufactured parallel systems, the control is used for High Pressure cutout.
26 Module Replacement 1. Disconnect power at the fuse box. 2. Remove wiring bo x from the retainer . 3. Remove the IRR 4000-93 Ring with an IRR P-101 or equivalent retaining ring pliers. 4. Remove the Retainer . 5. Pull out the module by the leads. 6.
27 Before the oil separator is installed, an initial charge of oil must be added to it. This initial charge of oil is the amount that is needed to just float the needle valv e float. This amount of oil will stay in the oil separator when in operation and will seal the needle and prevent damage to the float mechanism.
28 Table 22. A C & R Model Regulators A C & R CONNECTION OPERATION OIL LEVEL, MODEL SIZE PRESSURE SIGHT NO. DIFF, psig GLASS S-9010 3 BOLT 5 - 30 1/2 S-9010A 4 BOLT 5 - 30 1/2 S-9015 3/4” NPTF F.
29 Suction Filter Replaceable core suction filters are supplied as standard on all units. The flanged shell holds replaceable pleated filter elements suitable for installation in the suction line of refrigeration systems. In this way any contaminants left in the system at start-up can be removed before they circulate back to the compressor .
30 Superior Valve Company Replaceable Suction Filter • On many parallel systems , the Super ior V alv e Co . suction filter is installed. Table 25. Type F Filter Replaceable Cartridges Shell Catalog IBCA Cartridge Filter No.
31 Liquid Drain Control Method This method is ideal for large capacity systems since a smaller regulator is required for liquid line than for discharge line. During war m ambient temperature conditions v alves A and C will be open and V alve B will be closed.
32 Adjusting these valves can be complicated because the load must be v aried during the setting procedure and it is difficult to determine exactly when the bypass valve opens unless a pressure gauge can be located at the valve outlet.
33 General Maintenance Schedule (Service/Maintenance should be performed only by a qualified / certified refrigeration service technician.) Weekly • Check refrigerant charge using the liquid line sight glass. • Check compressor oil level. • Check compressor crankcase heater operation.
34 SERVICE DIAGNOSIS CHART Symptom Cause Remedy Compressor 1. Motor Line open. 1. Close starter or disconnect switch does not run 2. Fuse blown 2. Replace fuse 3. T r ipped overload 3. See electrical section 4. Control contacts dirty or jammed in 4. Repair or replace open position 5.
35 Symptom Cause Remedy Low 1. Insufficient refr igerant in system 1. Check for leaks. Repair and add charge discharge 2. Faulty condenser temp. regulation 2. Check condenser control operation pressure 3. Compressor suction or discharge valve 3. Clean or replace leaky valve plates inefficiencies.
36 SERVICE RECORD A permanent data sheet should be prepared on each installation, with a copy for the owner and the original for the installing contractor’ s files. If another firm is to handle ser vice and maintenance, additional copies should be prepared as necessar y .
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