Assessments - 2, GPA: 4
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Indoor coil must have R-22 specific, hard shut-off TXV refrigerant metering device. When installing a hard shut-off TXV on an indoor coil, follow the instructions provided with the new TXV. A typical hard shut-off TXV installation is shown in Figure 3. Figure 3 Typical TXV Installation HARD SHUT-OFF TXV SENSING BULB EQUALIZER TUBE EEEEEEEE8 O'CLOCK 4 O'CLOCK STRAP SENSING BULB (EITHER SIDE) SUCTION TUBE INDOOR COIL SUCTION TUBE LIQUID TUBE B. REFRIGERANT LINE SETS The refrigerant line set must be properly sized to assure maximum efficiency and proper oil circulation. Select line set tube diameters as specified in Figure 4. NOTE: If the line set actual length is to exceed 80 feet, or if there is more than 20 feet vertical separation between outdoor and indoor units, refer to the Long Line Application Guidline document for additional instructions. NOTE: Line set actual length must not exceed 200 feet. NOTE: A crankcase heater must be used when the refrigerant line length exceeds 80 feet. If it is necessary to add refrigerant line in the field, use dehydrated or dry, sealed, deoxidized, copper refrigeration tubing. Do not use copper water pipe. Do not remove rubber plugs or caps from copper tubing until connections are ready to be made. Be extra careful when bending refrigeration tubing. Tubing can “kink” easily, and if this occurs, the entire length of tubing must be replaced. ! WARNING PERSONAL INJURY HAZARD Failure to follow this warning could result in personal injury and/or death. Relieve pressure and recover all refrigerant before servicing existing equipment, and before final unit disposal. Use all service ports and open all flow-control devices, including solenoid valves. ! CAUTION UNIT OPERATION HAZARD Failure to follow this caution may result in improper product operation. Do not leave system open to atmosphere any longer than absolutely required for installation. Internal system components - especially refrigerant oils - are extremely susceptible to moisture contamination. Keep ends of tubing sealed during installation until the last possible moment. Figure 4 R-22 Line Set Tube Diameter (Liquid Tube Always a"” dia.) Service Valve Fittings Line Set < 80 feet long Line Set 80 - 200 feet long Model Size Liquid Suction Suction Line Diameter Suction Line Diameter 36 (3 ton) a” w” w” d” 42 (32 ton), 48 (4 ton) a” d” d” !8” 60 (5 ton) a” d” !8” !8” NOTE: If the line set actual length is to exceed 80 feet, or if there is more than 20 feet vertical separation between outdoor and indoor units, refer to the Long Line Application Guideline document for additional instructions. 506 01 5001 00 INSTALLATION INSTRUCTIONS 3-phase R-22 Split System Heat Pump 6 506 01 5001 00 C. ROUTING AND SUSPENDING REFRIGERANT LINES Run refrigerant lines as straight and direct as possible, avoiding unnecessary bends and turns. Always insulate the entire suction line. Both lines should be insulated when routed through an attic or when routed through an underground raceway. When routing refrigerant lines through a foundation or wall, do not allow refrigerant lines to come in direct contact with the building structure. Make openings large enough so that lines can be wrapped with extra insulation. Fill all gaps with RTV caulk. This will prevent noise transmission between the tubing and the foundation or wall. Along floor or ceiling joists, suspend refrigerant lines so that they do not contact the building structure, water pipes, or ductwork. Use insulated or suspension type hangers. Metal straps must be at least 1” wide to avoid cutting into the tube insulation. Keep the liquid and suction lines separate. Refer to Figure 5. Figure 5 Routing and Suspending Refrigerant Lines INSULATION SUCTION TUBE LIQUID TUBE OUTDOOR WALL INDOOR WALL LIQUID TUBE SUCTION TUBE INSULATION CAULK HANGER STRAP (AROUND SUCTION TUBE ONLY) JOIST 1” MIN THROUGH THE WALL SUSPENSION ! CAUTION UNIT OPERATION HAZARD Failure to follow this caution may result in improper product operation. Do not bury more than 36” of line set underground. Refrigerant may migrate to cooler buried section during extended periods of unit shut-down, causing refrigerant slugging and possible compressor damage at start-up. If ANY section of the line set is buried underground, provide a minimum 6” vertical rise at the service valve. D. OUTDOOR UNIT HIGHER THAN INDOOR UNIT Proper oil return to the compressor should be maintained with suction gas velocity. If velocities drop below 1500 fpm (feet per minute), oil return will be decreased. To maintain suction gas velocity, do not upsize vertical suction risers. Use the “<80 feet” suction line sizes shown Figure 4. Install oil traps every 20 feet of vertical suction line riser (refer to Figure 6). NOTE: If there is more than 20 feet vertical separation between outdoor and indoor units, refer to the Long Line Application Guidline document for additional instructions. Figure 6 Oil Traps for Outdoor Unit Higher than Indoor Coil 20 ft. 20 ft. 10” Max...
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