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Instructions GE, Modèle BTH 120 - 250

Fabricant : GE
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location of the appliance. Layout the total vent system to use the minimu. of vent pipe and elbows possible. 2. The installer may add up to a MAXIMUM OF FIFTY (50) EQUIVALEN. feet of pipe to the exhaust venting arrangement. This addition of FIFT. (50) EQUIVALENT feet of pipe on both the intake venting arrangemen. and exhaust venting arrangement must include any 3 inch PVC elbow. which equals (5) EQUIVALENT feet of pipe. 10 Table 2. VENT LENGTH TABLE Table 2. VENT LENGTH TABLE . 90° Elbow. 3" Minimu. Pipe (Feet. 3" Maximu. Pipe (Feet. 4" Maximu. Pipe (Feet. ONE (1. . 4. 11. TWO (2. . 4. 11. THREE (3. . 3. 10. FOUR (4. . 3. 10. FIVE (5. . --. 9. SIX (6. . --. 9. 4-inch PVC may be used for a MAXIMUM intake of ONE HUNDRED TWENT. (120) EQUIVALENT FEET and a MAXIMUM exhaust of ONE HUNDRE. TWENTY (120) EQUIVALENT FEET. The maximum number of 90° elbow. with the 4-inch venting is six (6) on the intake and six (6) on the exhaust. A 90° elbow is equal to five (5) equivalent feet of pipe. One (1) 90° elbo. is equal to two (2) 45° elbows. Any venting configuration using less tha. 50 equivalent feet should use 3-inch venting. See Table 2. The 3-inch venting terminals (provided) must be used with the 4-inc. venting by adding 4x3 reducing couplings at the venting terminals. . reducing coupling is also needed immediately after the condensate elbo. (exhaust) and immediately before the 3-inch blower adapter (intake) i. direct venting is installed. See Table 2. IMPORTAN. When multiple units are direct vented through a wall (3-inch or 4-inc. venting), all intake vent terminals should be no lower than the highes. exhaust vent terminal. NOTE: This unit can be vented using only PVC (Class 160, ASTM D-224. Schedule 40, ASTM D-1785 ; or Cellular Core Schedule 40 DWV, AST. F-891) , Schedule 40 CPVC (ASTM F-411), or ABS (ASTM D-2661) pipe. The fittings, other than the TERMINATIONS should be equivalent to PVC. DWV fittings meeting ASTM D-2665 (Use CPVC fittings, ASTM F-438 fo. CPVC pipe and ABS fittings, ASTM D-2661/3311 for ABS pipe. If CPVC o. ABS pipe and fittings are used, then the proper cement must be used fo. all joints, including joining the pipe to the Termination (PVC Material). PV. Materials should use ASTM D-2564 Grade Cement; CPVC Materials shoul. use ASTM F-493 Grade Cement and ; ABS Materials should use AST. D-2235 Grade Cement. NOTE: for Water Heaters in locations with high ambient temperature. (above 100°F) and/or insufficient dilution air, it is recommended that CPV. or ABS pipe and fittings (MUST USE SUPPLIED VENT TERMINAL) be used. 4. It is important that condensate not be allowed to buildup in the exhaus. vent pipe. To prevent this from happening the pipe should be installe. with a slight, 1/8 inch per five feet (5') of pipe maximum downwar. slope. 5. The vent system should be supported every five feet (5') of vertica. run and every three feet (3') of horizontal run of vent pipe length. NOTE: Stress levels in the pipe and fittings can be significantly increase. by improper installation. If rigid pipe clamps are used to hold the pipe i. place, or if the pipe cannot move freely through a wall penetration, the pip. may be directly stressed, or high thermal stresses may be formed whe. the pipe heats up and expands. Install accordingly to minimize such stresses. VENT PIPE PREPARATIO. 1. INITIAL PREPARATIO. A. Make sure the solvent cement you are planning to use is designe. for the specific application you are attempting. B. Know the physical and chemical characteristics and limitations o. the PVC, PVC cellular core, ABS or CPVC piping materials that yo. are about to use. C. Know the reputation of your pipe and cement manufacturer an. their products. D. Know your own qualifications or those of your contractor. Th. solvent welding technique of joining PVC, PVC cellular core, ABS o. CPVC pipe is a specialized skill just as any other pipe fitting technique. E. Closely supervise the installation and inspect the finished job befor. start-up. F. Contact the manufacturer, supplier, or competent consulting agenc. if you have any questions about the application or installation o. PVC, PVC cellular core, ABS or CPVC pipe. G. Take the time and effort to do a professional job. Shortcuts will onl. cause you problems and delays in start-up. The majority of failure. in these systems are the result of shortcuts and/or improper joinin. techniques. 2. SELECTION OF MATERIAL. PRIME. It is recommended that Tetrahydrofuran (THF) be used to prepare th. surfaces of pipe and fittings for solvent welding. Do not use water, rags. gasoline or any other substitutes for cleaning PVC cellular core, ABS o. CPVC surfaces. A chemical cleaner such as MEK may be used. CEMEN. The cement should be a bodied cement of approximately 500 to 160. centipoise viscosity containing 10-20% (by weight) virgin PVC materia. solvated with tetrahydrofuran (THF). Small quantities of dimethyl formamid. (DMF) may be included to act as a retarding agent to extend curing time. ...