Carrier 30GTN Service And Troubleshooting Manual

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Carrier 30GTN Service And Troubleshooting Manual Manual pdf 55 page image

Tightening Cooler Head BoltsGasket Preparation — When reassembling cooler heads, al-ways use new gaskets. Gaskets are neoprene-based and arebrushed with a light film of compressor oil. Do not soak gas-ket or gasket deterioration will result. Use new gaskets within30 minutes to prevent deterioration. Reassemble cooler nozzleend or plain end cover of the cooler with the gaskets. Torqueall cooler bolts to the following specification and sequence:5⁄ 8-in. Diameter Perimeter Bolts . . . . . . 150 to 170 ft-lb(201 to 228 N-m)1⁄ 2-in. Diameter Flange Bolts . . . . . . . . . . 70 to 90 ft-lb(94 to 121 N-m)1. Install all bolts finger tight.2. Bolt tightening sequence is outlined in Fig. 25. Followthe numbering or lettering sequence so that pressure isevenly applied to gasket.3. Apply torque in one-third steps until required torque isreached. Load all bolts to each one-third step before pro-ceeding to next one-third step.4. No less than one hour later, retighten all bolts to requiredtorque values.5. After refrigerant is restored to system, check for refrig-erant leaks with soap solution or Halide device.6. Replace cooler insulation.Condenser CoilsCOIL CLEANING — Clean coils with a vacuum cleaner,fresh water, compressed air, or a bristle brush (not wire). Unitsinstalled in corrosive environments should have coil clean-ing as part of a planned maintenance schedule. In this typeof application, all accumulations of dirt should be cleanedoff the coil.Do not use high-pressure water or air to clean coils —fin damage may result.Condenser Fans — Each fan is supported by a formedwire mount bolted to fan deck and covered with a wire guard.The exposed end of fan motor shaft is protected from weatherby grease. If fan motor must be removed for service orreplacement, be sure to regrease fan shaft and reinstall fanguard. For proper performance, fan should be positioned asin Fig. 26A and 26B (standard and low-noise applications).Tighten setscrews to 15 6 1 ft-lb (20 6 1.3 N-m).If the unit is equipped with the high-static fan option, thefan must be set from the top of the fan deck to the plasticring or center of the fan to a distance of 2.13 in. 6 0.12 in.(54 6 3 mm). This is different from standard fans, since thereis no area available to measure from the top of the orificering to the fan hub itself. See Fig. 27.IMPORTANT: Check for proper fan rotation (clock-wise viewed from above). If necessary, switch any 2power leads to reverse fan rotation.SIZES 080,090* WITH 18-BOLT HEADSSIZES 080,090* WITH 14-BOLT HEADS SIZES 100,110* WITH 22-BOLT HEADS SIZES 100,110* WITH 16-BOLT HEADSSIZES 130,150* SIZES 170,190* SIZE 210**And associated modular units.Fig. 25 — Cooler Head Bolt Tightening Sequence (Typical Tube Sheet)55