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1 - 19DA Hermetic Refrigeration Machine INTRODUCTION General - Use this booklet as a guide for initial start-up of the 19DA Hermetic Centrifugal Refrigeration Machine. Read and fully understand these instructions plus all necessary Job Data before beginning initial start-up. Instructions are given in the proper sequence for optimum machine performance. Job Data Required 1. Machine assembly prints 2. Wiring diagrams 3. Starter details 4. 19DA Installation Instructions 5. 19DA Operation and Maintenance Instructions Equipment and Materials Required 1. Mechanics' tools 2. Volt-ohmmeter 3. Carrier refrigerant drum charging valve 4. 5/8" SAE x 3/4” MPT cooler charging adapter 5. Five to ten ft of copper tubing or plastic hose 6. Halide or electronic leak detector 7. Low-pressure indicator a. Absolute pressure manometer b. Wet-bulb indicator 8. Clamp-on ammeter 9. Portable dehydration pump INITIAL PREPARATIONS CAUTION: Do not operate refrigerant pump unless machine is charged with refrigerara. Do йог start compressor or oil ршг.р, even for a rotation check, while machine is at vacuum. Check rotation only after compressor has been charged with oil and machine has been charged with refrigerant. Machine Tightness - A shipping vacuum was applied to the refrigerant side of the 19DA machine before shipment from the factory. Over a period of time, during shipment or storage, part of this vacuum may be lost. The loss of a small amount of vacuum may be acceptable and within Carrier's machine tightness standards. To determine if the vacuum loss is acceptable or not requires the following steps: © Carrier Corporation 1966 Form 19DA-1SS PURGE VALVE OPERATION PLATE PURGE PUMP SWITCH CHILLED WATER LOW TEMP CUTOUT PURGE OPERATING VALVES (6) Fig. 2 - 19DA Rear View 1. 2. Record and date vacuum reading shown on compound pressure gage located on compressor (Fig. 1). With this reading and the reading taken when the machine was received, determine vacuum leak rate using the following formula: Leak Rate = Vacuum loss ■i- No. of days between readings 3. If vacuum leak rate is 0.05 in. Hg or less per 24 hours, the machine is sufficiently tight. If vacuum leak rate exceeds this rate, perform "Refrigerant Pressure Test” and correct leakage. EXCESSIVE OR TOTAL VACUUM LOSS - Excessive or total vacuum loss can be caused by accidental opening of a valve or other connection. If this is suspected, proceed as follows: 1. Install a mercury manometer (absolute pressure type) to the cooler charging valve (Fig. 1). A dial type gage can not indicate the small amount of leakage acceptable during a short period of time. 2. Pull a vacuum on the machine equal to 25 in. Hg. Use external vacuum pump or energize purge pump (Fig. 2) using operation No. 2 described on the purge valve operation plate shown on Fig. 2. 3. Let the machine stand with this vacuum, and then perform the leak rate check previously outlined. 4. If the vacuum leak rate is 0.05 in. Hg or less per 24 hours, the machine is sufficiently tight. Perform all steps under "Machine Dehydration” (pg 3). 5. If the vacuum leak rate exceeds 0.05 in. Hg per 24 hours, perform all steps under "Refrigerant Pressure Test" (pg 2) and correct leakage. Perform all steps under "Machine Dehydration.” 6. Remove the mercury manometer from cooler charging valve. REFRIGERANT PRESSURE TEST 1. Pull approximately five inches of vacuum on the machine by energizing machine purge pump (Fig. 2). Use operation No. 2 described on the purge valve operation plate or with an external vacuum pump connected to the cooler charging valve (Fig. 1). 2. Charge approximately one gallon of Refrigerant 11 thru the cooler charging valve. Refer to refrigerant charging instructions (pg 4). 3. Increase pressure to eight to ten psi with dry air or nitrogen thru the cooler charging valve. DO NOT EXCEED TEN PSI. 4. Test all joints, valves, fittings, flanges, etc. with a halide or electronic leak detector. CAUTION: Due to rupture disc limitations ; DO NOT EXCEED TEN PSI. 2 5. Repair any leaks found. 6. Reinspect joints and flanges with the leak detector to ensure that all leaks have been found and repaired. Machine Dehydration - The refrigerant side of the 19DA machine is dehydrated at the factory. It is usually not necessary to repeat dehydration at initial start-up. However, if the machine has been open for a considerable length of time due to compressor removal, or if there was excessive loss of shipping vacuum, it is recommended that dehydration be repeated. WARNING: Do not start compressor or oil pump even for a rotation check while machine : is under dehydration vacuum. NOTE: Dehydration is readily accomplished at normal room temperature. If room temperature is high, dehydration takes place more quickly. Ac low room temperature, dehydration is extremely difficult and special techniques must be applied. Contact your Carrier representative. Perform dehydration as follows: 1. Connect...