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Hersteller: Bryant Dateigröße: 236.5 kb Dateiname: Unterrichtssprache:

The covers for these openings should be attached in such a mariner .that they will provide adequate seals against air leakage. ..... , ' * '!r ' 3.. The direction of Sow or circulating air through title Furnace is plainly marked on Models 982 and 983 BloWer casings. This flow direction must never be reversed. 4/The Furnace is approved for installation downstream from a refrigeration coil. When so installed, make provisions to dispose of the condensate through the 1/2-inch drain pipe connection in the bottom of the Furnace. If a bypass arrangement is used, it is not necessary to make these drain provisions. If the Duct Furnace is located on the intake side of an air conditioning unit, precautions should be taken to see that the fan motor and refrigeration, system of the air conditioning unit do not become damaged by the high temp erature :of the ' Fumace: discharge air. 5. Make sure :tHat the supply of circulating air is Sufficient. See Table IV, “Capacities and Ratings.” Make certain that the inlet temperature of this air is .not too high/Tt should not exceed 9QaP-_^___ When the Furnace is "off,” with cool air passing ;ihrough~itr-conden sation-may-fornv on-an~u nprotected casing. If this occurs, install additional insulation to the Furnace casing. In a crawl space, provide a vapor barrier on the ground and vent the crawl space. In a basement where there is an unusual amount of moisture from wall or floor seepage, install additional insulation to the Furnace casing—plus an adequate vapor barrier. -4— /08/2008/MON 12:23 PM UTC TECH PUB FAX No. 317 240 5662 P. 005/008 V. ELECTRICAL CONNECTIONS The Model 334 Duct Furnace is completely wired at the factory and is ready for connection to the external power source and to the room thermostat if used. Note that the Furnace is equipped with a dual-voltage transformer for either 115 or 230 volts. Insulate the end of the unused wire on the primary side of the transformer. A wiring diagram is attached to the furnace. The same diagram is included in this instruction. Be sure to refer to the wiring diagram when making field connections. All external wiring should be made in accordance with the National Electrical Code and any local ordinances that may apply. NOTE: Do not fasten a thermostat to the Furnace casing. VII. START-UP AND ADJUSTMENT L Start the unit. Use the procedure outlined on the lighting instruction plate attached to the Furnace. NOTE: On units equipped with an A-643 gas control valve, there are three positions for the manual valve knob (OFF-PILOT-ON), There is a positive stop at the PILOT position. To move the manual valve knob from the PILOT position to either ON or OFF position, the manual valve knob must be depressed. 2.. Adjust the pilot flame. The adjusting screw under the screw cap on the pilot valve is used for this purpose. To adjust the pilot flame on units equipped with a Model A-643 valve, the adjustment screw is. located in the pilot outlet portion of the valve body. Remove the cap screw, make the necessary adjustment, and replace the cap screw. ■ ■ r ■ For D4 controls, the flame should be long enough for good impingement on the metal element of the Bryant pilot. For D5 and D2 controls, the flame should surround the thermocouple element of the pilot and extend downward to include 3/8 to 1/2 inch of the thermocouple, The flame should never come in contact with any other part of the thermocouple or its lead wire. 3, Cheek the input. The input should be checked at the meter to make sure that it corresponds with the input shown on the rating plate attached to the unit. See Bryant form No. 39003D1 for the method. 4. Final Checkout. Move the thermostat setting above and below room temperature several times, pausing between each “on” and “off” cycle to make sure that the main burners ignite properly. Attach a Iow-voltage test light to the electrical leads of the gas valve. With the thermostat set above room temperature, close the manual pilot valve. If the test light goes out when the pilot cools, the pilot is functioning properly. The test light should go out within 45 seconds after the pilot gas supply is turned off. NOTE: This check does not apply to units equipped with Model A-643 gas valves. Check the operation of the temperature limit control. This’Caji.rbe'done by allowing the burners to operate while the remote air mover is not running to see that the limit switch ope’us. Check all connections in the gas piping for leaks. Use a. soap-and^water solution. WARNING: Never use a flame to check for leaks. SEP/08/20Q8/MON 12:24 PM UTC TECH PUB FAX No. 317 240 5662 P. 006/008 VIII. SERVICE AND MAINTENANCE L. Pilot Orifice - is located in the bottom fitting of the pilot and is readily accessible for inspection and cleaning. 2. Main Burner Orifices - are an integral part of the orifice spuds on the manifold. The orifice assembly is readily unscrewed from the manifold after the burner is removed. 3. Removing Main Burne...

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