Assessments - 2, GPA: 4
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Facilidade de uso
The tube end must stay bottomed in the service valve during final assembly to ensure proper seating, sealing, and rigidity. MECHANICAL FITTING REPAIR To replace damaged ferrule or tubing, proceed as follows. 1. Attach gages to service valves. 2. Close liquid service valve and operate unit in cooling mode to pump refrigerant charge into condenser coil. 3. When suction pressure reaches 5 psig, shut unit off. Do not operate unit in a vacuum. VALVE FITTING FERRULE LOCK NUT A92120 Fig. 4—Suction Service Valve with Mechanical Adapter (38YCP Model) FERRULE LOCK NUT TUBING A92121 Fig. 5—Lock Nut/Ferrule Positioning 4. Close suction service valve and recover refrigerant in tubing. 5. Back-off locknut and ferrule onto tube. 6. Remove damaged part of tubing using tubing cutter. Repeat installation procedure previously outlined using new ferrule. 7. Evacuate tubing set and indoor coil. Check for leaks. 8. Open service valves or recharge unit. Check refrigerant charge. A92122LOCK NUT MARK ON LOCK NUT AND TUBE TUBING Fig. 6—Proper Marking of Valve Assembly 2 NOTE: A thermostatic expansion valve (TXV) is required on all 38BYB units. Step 4 refers to the installation of the TXV. Step 4—Remove Indoor AccuRater® Piston and Install TXV For proper unit operation and reliability, units must be installed with a field-supplied hard shut-off TXV. Do not install with evaporator coils having capillary tube metering devices or piston. After removing existing AccuRater from indoor coil, install field-supplied bi-flow hard shut-off TXV kit. (See Fig. 7 and 8.) THERMOSTATIC EXPANSION VALVE COIL SENSING BULB EQUALIZER TUBE A88382 Fig. 7—Typical TXV Installation 2 O'CLOCK 10 O'CLOCK SENSING BULB STRAP SUCTION TUBE 8 O'CLOCK 4 O'CLOCK 7.8 IN. OD & SMALLER LARGER THAN 7.8 IN. OD A81032 Fig. 8—Positioning of Sensing Bulb For TXV kit part number and charging instruction, refer to TXV label in your unit. If the indoor unit (fan coil) comes factory equipped with a bi-flow hard shut-off TXV, no TXV change is required. Install TXV kit to indoor coil as follows: 1. Install suction tube adapter. 2. Install liquid flare-to-sweat adapter. 3. Connect external equalizer tube to fitting on suction tube adapter. 4. Position sensing bulb on horizontal portion of suction tube adapter. Secure using supplied hardware. 5. Insulate bulb after installation. (See Fig. 8.) 6. Leak check all connections. 3 SERVICE TRAINING Packaged Service Training programs are an excellent way to increase your knowledge of the equipment discussed in this manual, including: • Unit Familiarization • Maintenance • Installation Overview • Operating Sequence A large selection of product, theory, and skills programs is available, using popular video-based formats and materials. All include video and/or slides, plus companion book. Classroom Service Training plus "hands-on" the products in our labs can mean increased confidence that really pays dividends in faster troubleshooting, fewer callbacks. Course descriptions and sche...
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