Stimmen - 3, Durchschnittliche Bewertung: 4.3 ( )

Hersteller: Berner International Dateigröße: 428.2 kb Dateiname: Unterrichtssprache:

If this happens, turn the remote selector to “OFF/RESET” then back to “WIN” to reset CR for another start. Repeated failure to ignite may result in lockout of the CRE flame safeguard itself, causing small red “LOCKOUT” pilot to light. This button must then be reset at the control cabinet before another try-for-ignition can be made. If electric power to the control circuit fails for any reason, whether intentional or otherwise, and no matter how briefly, the flame safeguard gives a safe-start component check when power is restored. If a flame simulating component failure exists it will not proceed to the ignition cycle and will not energize the main gas valve. The flame safeguard senses first the presence of pilot flame. Then, after the main automatic valve opens, the pilot is interrupted and main flame only is monitored. If main flame fails after pilot is interrupted there will be a 5 second trial for re- ignition per 2nd preceding paragraph. 3 X. X. E (F) Fan Starter: Although not normally considered a safety device, the fan starter is wired so that its 13-14 interlock powers the control system. Thus the main fan must be energized before the gas system can be powered. This provides one more assurance, in addition to the Airflow Switch, that the fan is operating before heat comes on. (G) Secondary Safety** and Bleed Valves (or “Block & Vent Valves): A second main line gas valve is installed downstream of the primary safety valve. A vent line with an electrically operated normally-open valve takes off laterally between the two main line valves. This vent line must be piped to atmosphere outside the building, by the customer on installation (See Suggestions for Regulator.) IX. OPERATION GAS SUPPLY PRESSURE (in.w.g.) MODEL B-22, 6500 CFM 1000’S BTU/HR RISE (.F) FINAL TEMP. (. F)* 5” 700 99 169 6” 765 109 179 7” 820 117 187 8” 7” MAX. RECOMMENDED GAS SUPPLY PRESSURE (in.w.g.) MODEL B-24, 7900 CFM 1000’S BTU/HR RISE (.F) FINAL TEMP. (. F)* 5” 790 92 162 6” 865 101 171 7” 930 109 179 8” 990 116 186 * Based on 70. F. inlet temperature. (A) Gas Adjustment: Heat output is adjusted by varying the outlet pressure of the regulator (see Gas Pressure Regulator). A pressure gage may be attached to the piping at aleak-test connection. Table 1 shows performance at various inlet pressures. (B) Pilot Adjustment: This heater is equipped with interrupted pilot; i.e., after main burner ignites, pilot is cut off. Scanner then senses main flame only. Pilot flame was properly adjusted at the factory.Fieldadjustment is possible by removing the protective cap and using a screwdriver with asmall bit. (Note: See wiring diagram for part number and manufacturer of any control component. See manufacturer’s instruction sheets for more information.) (A) Fan Motor Bearings: Refer to green sheet on maintenance of direct-connected fans. Most fan motors have a 1/8" NPT pipe at each bearing, which may beremoved for lubrication, in the event lube tubes were not factory- installed. (B) Burner: Side plates and their air holes should be checked periodically, to be sure these parts are not fouled or plugged. (C) Burner Adjustment: (See Operation). (D) Fireye: The UVM-IF utilizes solid state components. The only required maintenance is on its external components; i.e., the Flame Rod and the Ultra -Violet Scanner. See “Maintenance” in manufacturer’s bulletin C-400. (E) Scanner: Remove scanner occasionally,clean lens, andbe sure that mounting pipe nipple is clear of insects anddirt. (F) Spark Ignitor: Ignition takes place by means of a spark jumping from the ignitor to the side plate of the burner. The spark gap should be 1/8" to 3/16" (. 12" -. 19"), and located downstream of an air mixing hole, so that there is a gas-air mixture to be ignited. Check for carbon “bridge” between electrode and burner which may short out spark and prevent ignition. XI. TROUBLESHOOTING First check for loose wiring connections. Then check the following for specific symptom: (A) Fan Won’t Start ( 1) Selector in “OFF” position. (2) Check 3-phase line leads for power across all 3 phases, if one line is dead, check fuses or breaker in main disconnect. (3) Check fuse on control circuit transformer. (4) Try “SUM” setting. If fan runs, but won’t run on “@”, check 1T’HS outdoor thermostat (if used) for open R-B contact; check limit switch on door for open-contact. 4 TROUBLESHOOTING SYMPTO M S CAUSE FAN WON’T START 1) 2) 3) 4) 5) Selector in “OFF” position Check 3-phase line leads for power across all 3 phases (If one line is dead, check fuses or breaker in main disconnect) Check fuse on control circuit transformer Try “SUM” setting. If fan runs, but won’t run on “WIN”, check 1THS outdoor thermostat (if used) for open R-B contact; check limit switch on door for open-contact. Check overload relay on fan starter. Iftripped,reset. If relay continues to trip, check motor full load amps versus M starter’s overload relay’s setting (adjustment dial on the front of starter). See manufacture...

Herunterladen

Geben Sie zwei Ziffern: