Carrier 69NT40-541-500 Operation And Service Manual
Also see for 69NT40-541-300: Operation and service
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Contents
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T-363 7–147.8.5 Installing the Componentsa. Push pistons from the inside of the crankcase through the cylinders, be careful not to break rings. Placerods so that the chamfered side is against radius of crankpins. Install the crankshaft and thrust washerthrough the pump end of the compressor. Ensure thrust washer is fitted on locating pin. Do not damagemain bearings. Bring rods in position against crank bearings.b. Install the pump end thrust washer on the two dowel pins located on the bearing head (see Figure 7.8).CAUTION!Ensure that the thrust washer does not fall off dowel pins while installing oil pump.CAUTION!The set screw on the crankshaft must be removed for this type of oil pump (see Figure 7.8).c. Install bearing head assembly with a new gasket on the compressor crankshaft. Carefully push oil pump onby hand, ensuring the thrust washer remains on the dowel pins. The tang on the end of the drive engagesthe slot in the crankshaft, and the oil inlet port on the pump is aligned with the oil pickup tube in the crank-case. The pump should be mounted flush with the crankcase, and oriented with the oil pick up tube and oilinlet port, and aligned as shown in Figure 7.8.d. Align gasket and install eight cap screws in mounting flange. Refer to Table 7–5 for torque values.e. Install matching connecting rod caps Be sure rod is not bound and crankshaft will turn correctly as each setof rod bolts is torqued.f. Be sure key fits properly when installing rotor on shaft. Screw on equalizer tube and lock screw assemblywith lock washer and bend over tabs of lock washer. Assemble suction strainer to motor and cover, and boltcover to crankcase. Assemble valve plates and gaskets. Assemble cylinder heads & gaskets. Turn shaft byhand to see that it moves freely.g. Install the oil suction screen, the oil suction screen hold down plate, and the bottom plate.7.8.6 Compressor Oil LevelCAUTION!Use only Carrier Transicold approved Polyol Ester Oil (POE) - Castrol-Icematic SW20 compres-sor oil with R-134a. Buy in quantities of one quart or smaller. When using this hygroscopic oil,immediately reseal. Do not leave container of oil open or contamination will occur.a. Checking the Oil Level in the Compressor1. Turn unit on and operate in cooling mode for at least 20 minutes.2. Check the front oil sight glass on the compressor to ensure that no foaming of the oil is present after 20 min-utes of operation. If the oil is foaming excessively after 20 minutes of operation, check the refrigerant systemfor flood-back of liquid refrigerant. Correct this situation before performing step 3.3. Turn unit off to check the oil level. The correct oil level range should be between the bottom to one-eighthlevel of the sight glass. If the level is above one-eighth, oil must be removed from the compressor. Toremove oil from the compressor, follow step d in this section. If the level is below the bottom of the sightglass, add oil to the compressor following step b below.b. Adding Oil with Compressor in System1. The recommended method is to add oil using an oil pump at the oil fill valve (see item 10, Figure 7.5).2. In an emergency where an oil pump is not available, oil may be drawn into the compressor through the suc-tion service valve. |
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