Évaluations - 3, GPA: 4.3
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Facilité d'utilisation
Instructions are in proper sequence for optimum machine performance. Data and Equipment Required PRINTS: Machine assembly and INSTRUCTIONS: MATERIALS: wiring, piping Starter diagrams Special controls and related wiring (if any) 19EA Installation book 19EA Operating and Maintenance book Starter Instructions Mechanics’ tools, electronic or halide leak detector, clamp-on ammeter, volt-ohmmeter INITIAL PREPARATIONS Machine Tightness — The 19EA is shipped with the refrigerant charge in the utility vessel and a holding charge (10 psig) in the unishell. Several levels of leak testing may be required depending on condition of machine on arrival and at start-up. Determine machine condition and follow procedure indicated in Table 1. For transferring refrigerant and evacuating vessels, follow the pumpout instructions on pages 3 and 4. Table 1 — Selection of Leak Test Procedures MACHINE CONDITION PROCEDURE 1. Unishell holding charge and utility vessel refrigerant level unchanged. 4 2 Unishell holding charge decreased slightly. 3 and 4 on unishell 3. Utility vessel refrigerant level decreased slightly. Leak test with halide or electronic leak detector. 4. UnisKel! holcTing charge completely gone Opened valve or other open connection suspected. 1 5 Unishell holding charge completely gone Vessel leak assumed 2, 3, and 4 on unishell 6 Refrigerant charge in utility vessel completely gone. Opened valve or , ) other open connection ^ suspected. 1 - Use nitrogen with R-12 tracer in pressurizing for leak test procedures 2 and 3 7 Refrigerant charge in utility vessel completely gone. Vessel leak assumed 2, 3/ and 4 on uti ¡My vessel. Use nitrogen with R-12 tracer for pressurizing in 2 and 3 WARNING: Never charge liquid refrigerant into the «aisheli if vessel pressure is below 35 psig.v or with water pumps not operating. Cooler tube foeeze-ap and. coasiderabie damage may result. PROCEDURE 1 — Standing Vacuum Test 1. Attach a mercury manometer (absolute pressure-type) to the refrigerant charging valve, (6) Fig. 1. A dial-type gage cannot indicate the small amount of leakage acceptable during a short period of time. 2. Pull a vacuum on the vessel (see evacuating procedures on page 3) equal to 25 in. Hg, ref 30-in. bar. (2.5 psia), using the pumpout system pump. 3. Valve off pump to hold vacuum, and record manometer reading. 4. If the leakage rate is less than 0.05 in. Hg/24 hours, perform procedure 3, all steps under Machine Dehydration and procedure 4. 5. If the leakage rate exceeds 0.05 in. Hg/24 hours, perform procedures 2, 3, all steps under Machine Dehydration, and procedure 4 in the order indicated. 6. Remove mercury manometer from refrigerant charging valve. PROCEDURE 2 — Follow steps 1 thru 4 of Return Refrigerant to Normal Operating Conditions, page 3. Raise vessel pressure slowly to 5 psig by cracking open valve 4. Perform leak test with halide or electronic detector and repair any leaks. PROCEDURE 3 — Following steps 1 thru 5 of Return Refrigerant to Normal Operating Conditions, page 3, raise vessel pressure to 35 psig. Perform leak test with halide or electronic detector and repair any leaks. PROCEDURE 4 — Equalize pressure between utility vessel and unishell following steps 1 thru 5 of Return Refrigerant to Normal Operating Conditions, page 3. Vessel pressure will be approximately 70 psig. Perform leak test with halide or electronic detector and repair any leaks. If refrigerant charge was lost and nitrogen has been used for pressurizing in procedures 2 and 3, evacuate vessel and then charge 400 lb of R-12 for procedure 4. If vessels are then leak tight, continue charging refrigerant to the level indicated in Charging Quantity Table below. Table 2 — Charging Quantity MACHINE SIZE WEIGHT (lb R-12) 19EA 400, 430, 465 19EA 500, 550 19EA 590, 630 2000 2200 2400 1 Q«Q Form 1QFA-1RS COMPRESSOR MOTOR TERMINAL BOX COMPRESSOR MOTOR DRIVE CONDENSER SECTION e, add REAR VIEW LEGEND 1 Pumpout Service Valve 1 20. Sight Glass — Rotation 2 Pumpout Service Valve 2 21. Sight Glass — Seal Oil 3 Pumpout Service Valve 3 22 Sight Glass — Liquid Level 4. Pumpout Service Valve 4 23 Sight Glass — Liquid Level 5 Pumpout Service Valve 5 24. Sight Glass — Liquid Level 6 Pumpout Service Valve 6 and Refrigerant Charging Valve 25 Sight Glass — Liquid Level 7. Pumpout Service Valve 7 26 Refrigerant Drain Valve 8 Pumpout Service Valve 8 27. Isolation Valve 9. Service Valve 9 (hidden between unishell and utility vessel) 28 Isolation Valve (hidden) 10 Differential Pressure Gage (oil) 29. Isolation Valve 11 Condenser Pressure Gage 30. Isolation Valve — ball valve between unishell 12 Cooler Pressure Gage and utility vessel (hidden) 13. Dehydrator Water Valve 31 Chilled Water Control Element 14 Oil Level Sight Glass 32 Pumpout Vent Valve with Flare Cap 15 Oil Temperature Gage 33. Bearing Return Oil Thermometer (hidden) 16 Oil Heater (with indicator light) 34 Dehydrator Pressure Gage 17...