Assessments - 2, GPA: 4 ( )

Fabricante : Lennox International Inc. Arquivo Tamanho: 2.2 mb Arquivo Nome : Língua de Ensino:

Honeywell VR8205 Gas Valve with Control Knob Turn knob on gas valve clockwise 41_ to OFF. Do not force, See figure 28, White Rodgers 36G Gas Valve -Move gas valve switch to OFF. See figure 29, 7 -Wait five minutes to clear out any gas. If you then smell gas, STOP! Immediately call your gas supplier from a neighbor's phone. Follow the gas supplier's instructions. If you do not smell gas go to next step. Honeywell VR8205 Series Gas Valve MANIFOLD (With On/Off Switch) PRESSURE MANIFOLD SCREW PRESSURE (under cap) OUTLET DI GAS VALVE ON/OFF SWITCH SHOWN IN OFF POSITION FIGURE 27 Honeywell VR8205 Series Gas Valve with Gas Control Knob MANIFOLD MANIFOLD PRESSURE ._ _ PRESSURE ADJUSTMENT"'_'___,_, r I h _'_'l_, OUTLET SCREW _ GAS VALVE SHOWN IN OFF POSITION FIGURE 28 White Rodgers 36G Series Gas Valve MANIFOLD PRESSURE ADJUSTMENT SCREW (Undercover SCOW) PRESSURE POST GAS VALVE SHOWN IN OFF POSITION FIGURE 29 Page 25 8-Honeywell VR8205 Gas Valve with ON/OFF Switch -Move gas valve switch to ON. See figure 27. Honeywell VR8205 Gas Valve with Control Knob Turn knob on gas valve counterclockwise _ to ON, Do not force. See figure 28, White Rodgers 36G Gas Valve -Move gas valve switch to ON, See figure 29, 9 -Replace the upper access panel, 10-Turn on all electrical power to to the unit, 11-Set the thermostat to desired setting, NOTE -When unit is initially started, steps 1 through 11 may need to be repeated to purge air from gas line, 12-If the appliance will not operate, follow the instructions "Turning Off Gas to Unit" and call your service technician or gas supplier, Turning Off Gas to Unit 1 -Set the thermostat to the lowest setting, 2 -Turn off all electrical power to the unit if service is to be performed, 3 -Remove the upper access panel, 4-Honeywell VR8205 Gas Valve with ON/OFF Switch -Move gas valve switch to OFF, See figure 27. Honeywell VR8205 Gas Valve with Control Knob Turn knob on gas valve clockwise clio to OFF, Do not force, See figure 28, White Rodgers 36G Gas Valve -Move gas valve switch to OFF, See figure 29, 5 -Replace the upper access panel. Heating Sequence Of Operation 1 -When thermostat calls for heat, combustion air inducer starts, 2 -Combustion air pressure switch proves combustion air inducer operation. Switch is factory set and requires no adjustment, 3 -After a 15 second prepurge, the hot surface ignitor energizes, 4-After a 20 second ignitor warm-up period, the gas valve solenoid opens, 5 -Gas is ignited, flame sensor proves the flame, and the combustion process continues, 6 -If flame is not detected after first ignition trial, the ignition control will repeat steps 3 and 4 four more times before locking out the gas valve ("WATCHGUARD" flame failure mode), The ignition control will then automatically repeat steps 3, 4, 5, and 6 after 60 minutes, 7-To interrupt the 60-minute "WATCHGUARD" period, move thermostat from "Heat" to "OFF" then back to "Heat", Heating sequence then restarts at step 1. Gas Flow (Approximate) 1 -Operate unit at least 15 minutes before checking gas flow. Determine the time in seconds for one revolutions of gas through the meter, A portable LP gas me ter (17Y44) is available for LP applications, 2 -Compare the number of seconds and the gas meter size in table 10 to determine the gas flow rate. Multiply the gas flow rate by the heating value to determine the unit input rate, If manifold pressure is correct and the unit input rate is incorrect, check gas orifices for proper size and restriction, 3 -Remove temporary gas meter if installed, NOTE -To obtain accurate reading, shut off all other gas appliances connected to meter, TABLE 10 Gas Flow Rate (Ft.'_/Hr.) Seconds for 1 Gas Meter Size Revolution 1/2 cu ft Dial 1 cu ft Dial 10 180 360 12 150 300 14 129 257 16 113 225 18 100 200 2O 90 180 22 82 164 24 75 150 26 69 138 28 64 129 3O 60 120 32 56 113 34 53 106 36 50 100 3847 95 4O45 90 4243 86 4441 82 46 3978 48 3875 5O36 72 52 3569 54 3367 56 3264 58 31 62 6O 30 60 Gas Pressure 1 -Check the gas line pressure with the unit firing at maximum rate. A minimum of 4.5 in, w.c. for natural gas or 11,0 in, w,c, for LP/propane gas should be maintained, 2-After the line pressure has been checked and adjusted, check the manifold pressure. A natural gas to LP/propane gas changeover kit is required to convert the unit, Manifold pressure for all units fueled by natu- Page 26 ralgasatallaltitudesis3.5"w.c.Manifoldpressurefor allunitsfueledbyL.R/propanegasat allaltitudesis 10.0"w,c.Seefigures27,28and29forthelocationof themanifoldpressureadjustmentscrews, NOTE -In Canada, certification for installations at elevations over 4500 feet (1372 m) is the jurisdiction of local authorities. Manifold pressure for all units fueled by natural gas at all altitudes is 3.5" w,c, Manifold pressure for all units fueled by L,R/propane gas at all altitudes is 10,0" w,c, NOTE -A natural to L.R propane gas changeover kit is necessary to convert this un#. L.R conversion kit 25W20 is used with all units installed...

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