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Фрагмент инструкции
Crankcase heaters on all units are wired into the control circuit, so they are always operable as long as the main power supply disconnect is on (closed), even if any safety device is open. Compressor heaters must be on for 24 hours prior to the start-up of any compressor. 28 11. Check supply fan belts, sheaves, and bearings. Check the lubrication of the fan and motor bearings. Check bearing and bearing set screws for tightness. Check sheave alignment and belt tension. Hand turn fan to ensure fan wheel does not rub on housing. The fan shaft and motor shaft must turn freely before power is applied to the unit. 12. Check exhaust fan belts, sheaves, and bearings. Check the lubrication of the fan and motor bearings. Check bearing and bearing set screws for tightness. Check sheave alignment and belt tension. Hand turn fan to ensure fan wheel does not rub on housing. 13. Check economizer linkage. Economizer dampers should be fully closed. Linkage should permit full and free travel. 14. Check that the correct return air filters are installed in the filter tracks. Do not operate unit without return air filters. 15. Check that all access doors on the air handler section have been closed and secured. 16. Fan motors are 3-phase. Check rotation of fans during first start-up check. Fan rotation is clockwise as viewed from top of unit. If fan is not turning clockwise, reverse 2 of the power wires. Compressor Oil — Check that compressor oil is visible in the sight glass of the compressor. All units are factory charged with oil. See Table 3. Observe oil level closely at start-up. If oil level is below the sight glass and cannot be seen, add oil until the level is approximately 3.8 to 1.8 of sight glass (06E-299 compressors are 1.8 of sight glass). See Fig. 44. See Oil Charge section on page 49 for information on adding or removing oil. If oil charge is above sight glass, do not remove any oil until the compressor crankcase heater has been on for at least 24 hours. When additional oil or a complete charge is needed, use only Carrier-approved compressor oil. Do not reuse drained oil and do not use any oil that has been exposed to the atmosphere. COMPRESSOR 06E COMPRESSOR (EXCEPT 06E-299) 06E-299 1/8 3/8 1/8 Fig. 44 — Operating Oil Levels (Sight Glass) Evaporator-Fan Belts, Pulleys, and Sheaves — Belts, pulleys, and sheaves are factory installed. All pulleys are nonadjustable. See Table 1 for fan shaft center distance ranges and shaft sizes when making selections for field-supplied drives. Factory-installed drives are fixed-speed and are nonadjustable. Refer to Table 1 for factory-supplied wheel speeds and drive set data. If different wheel speeds are required for an application, Carrier recommends that the installer contact the nearest Browning dealer. The Browning dealer can develop the required information for the fan drive set. Observe the maximum wheel speed and unit airflow limits for the specific unit size and fan type. See Tables 8-12 for forward curve supply fan performance. See Tables 13-17 for air foil supply fan performance. FAN PERFORMANCE, 48MP UNITS — To obtain fan performance for 48MP units: 1. Enter fan performance table for appropriate base unit type and unit size. 2. Determine the external static pressure from the fan performance table using fan type, field-measured rpm, and airflow (cfm). 3. Refer to the Component Pressure Drops table (Table 18) on page 35. Calculate the adjusted external static pressure value for the correct unit size and airflow for gas heat units. 4. Calculate the net external static pressure for the gas heat units by subtracting the adjusted external static pressure value from Table 18 (Step 3) from the external static pressure from the fan performnce table (Step 2). EXAMPLE: Field Measurements: Unit: 48MP62L Fan Type: Forward Curved RPM: 500 CFM: 22,000 1. Select Fan Performance Table 8, 48/50MP62L with Forward Curved fan. 2. Determine external static pressure using 500 rpm and 22,000 cfm. ESP = 1.25. 3. Read the adjusted external static pressure from the Component Static Pressure Drops table for 48MP62L gas heat units at 22,000 cfm. Adjusted ESP = 0.31. 4. Calculate external static pressure. ESP = ESP . ESP Adjusted = 1.25 . 0.31 = 0.94 in. wg Check rotation of wheel with arrow on the fan housing. Check fan speed with a strobe-type tachometer, or use this formula: motor rpm x motor sheave pitch diameter (in.) Fan = Rpm fan sheave pitch diameter (in.) (Obtain motor rpm from the fan motor nameplate and read sheave pitch diameters marked on the fan and motor sheaves.) EXAMPLE: Nameplatemotorrpm .........................1760 Motorsheavepitchdiameter(in.) .................6.4 Fansheavepitchdiameter(in.) ..................12.4 1760 x 6.4 FanRpm= = 908Rpm 12.4 The maximum allowable fan speed for the supply fan is shown in Table 19. The maximum allowable fan speed for the power exhaust fan is shown in Table 20. Excessive fan speed may result in condensate carryover from the evaporator coil, ...
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