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Hersteller: Bryant Dateigröße: 238.83 kb Dateiname: Unterrichtssprache:

Use pipe unions to join the unit heater to the ceiling hangar. 6. Do not lift the heater by the motor mount, manifold, or louvers. Use a rope sling whenever this IS possible. IV. WIRING. Make all electrical connections in accordance with the National Electric Code and any local codes .that may apply. The unit must be grounded electrically in accordance with the National Electric Code and local codes governing such installations. A permanent and uninterrupted or unbroken ,,gr ound-is-essenti al-to-m-imm-taing-peKso naLinj ux.y_iLan_eiec=_ trical fault should occur. If aluminum conductors are to be used, the wire size Belec-ted must have a current capacity not less than that of the copper wire specified and must not create a voltage drop between the service panel and the unit in excess of 2% of the unit rated voltage. As a minimum, aluminum wire must be treated to prevent oxidation. With electric power turned off, recheck all electrical connections (both factory and field) for tightness. Be sure to check power supply connections, especially if aluminum conductors are used. The unit heater is completely wired at the factory and is ready for connections to a 115/60/1 power source. See wiring diagram. The heat anticipator on the thermostat should be set at 0.8 amps, VI. STARTUP AND ADJUSTMENT NOTE: Remove burner hold-down shipping bracket. 1. Start unit using procedure outlined on lighting instruction plate attached to heater. 2, Adjust pilot flame. Adjusting screw under screw cap on pilot valve is used for this purpose. For D4 controls, flame should be long enough for good impingement on metal element of Bryant automatic pilot. For D5 and D2 controls, flame should surround thermocouple element of pilot and extend downward to include 3/S to 1/2 inch of thermocouple. Flame should never come in contact with any part of thermocouple lead wire. To adjust pilot flame on units equipped with Model A-643 valve, adjustment screw is located in pilot outlet portion of valve body. Remove capscrew, make ........ .nesessafy. adjustment, and replace capscrew.................... -^3^hecHhput.-Input:- shdtild-b e chfeCked'dt niétéTtti'iiïH'ltë"1, sure that it corresponds with input shown on rating plate attached to unit. See Bryant form №>, 39QQ3D1 for method. 4. Final Checkout. Move thermostat setting above and below room temperature several times, pausing be- -tween.. each—'¡on—-and—Qff.!_ç.ycle-,.tn-ma,ke-sui.e--that-. main burners ignite properly. Attach low-voltage test light to electrical leads of gas valve* With thermostat set above room temperature, close manual pilot valve. If light goes out when pilot cools, pilot is functioning properly. Test light should go out within 45 seconds after pilot gas supply is turned off. Check Operation of temperature limit control. Do this by allowing burners to operate while fan is not running to see that limit switch opens. — 3 — SEP/09/2008/TUE 03:33 PM UTC TECH PUB FAX No. 317 240 5662 P. 004/006 Check all connections in gas piping for leaks* Use soap-and-water solution. VII. SERVICE AND MAINTENANCE 1. Pilot Orifice is located in bottom fitting of pilot and is K readily accessible for inspection and cleaning. 2. Main Burner Orifices - Orifice is readily unscrewed from manifold after burner is removed. 3. Removing Main Burners - Lift rear of burner and push it away iroim manifold enough to disengage orifice spud from mixer shield. Then pull down and out of heater. End of burner away from manifold seats in slotted burner support. It is necessary to lift burner out of this slot before attempting to push burner back. See Figure 12. NOTE: Disconnect the pilot tubing and wires to remove the burner that holds the pilot. However, it is not necessary to remove the pilot itself from the burner. 4. Cleaning - Heat exchanger tubes should be inspected at regular intervals and cleaned when necessary. a. Shut off gas and electricity. Heater should be cool, b. Loosen two knurled-head screws to release rear access door. Door will hang down freely. c. Disconnect pilot tube and wires. d. Remove main burners and pilot. e. TJse stiff brush to scrub heat exchanger tubes. Remove all loose scale and any soot that may have collected. f. Replace burners and pilot. Reconnect pilot tube and wires. g. Unit is now ready for relighting. 5. Oiling - Oil fan motor (s) yearly, or more often, with enough drops of SAE No. 20 nondetergent oil to overflow oil cup; or every 2 years, or more often, with Anderol L-465itt obtainable in tubes from your dealer. (Bryant F/N 7O291D01). See FTB143. * Lehigh Chemical Company SIZES 30 THRU 150 UNIT HEATER WIRING DIAGRAMS Figure 3—With 733 Pilot Installed .... Figufc 4—With '732 №t Installed LEGEND 1A Transformer 6B Pilot with Auto. SG Fan Relay—N.O, Ignition Coil 3A Fan Motor 7K Temp Limit Control— 3A1 Fan Motor SPDT—N.C. 3A2 Fan Motor 7P Pressure Switch'— 3 C Fan Motor SPST—N.O. 5A Automatic Gas Valve 11A Resistor 6A Piiot Sw...

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