Assessments - 2, GPA: 4
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VENT DAMPER Figure 2-7_Vent Damper and Vent Damper Terminal Block WARNING The vent damper must be installed directly on the flue outlet located on the top of the draft hood (see FIG. 2-7). Do not alter the wire har ness sup plied with the vent damper. Follow the instructions supplied with the vent damper. CAUTION An appliance which is shut down or will not operate may experience freezing due to con vec tive air flow down the flue pipe connected to the unit. Proper freeze protection must be pro vid ed, see Freeze Protec tion. Automatic Vent Damper This heating boiler is design certified for use with the automatic vent damper (FIG. 15) part number printed on the boiler’s rating plate. A vent damper must be installed on all residential heating boilers with inputs of less than 300,000 Btu/hr to comply with minimum efficiency requirements. A vent damper is factory supplied with residential heating boilers with inputs of 45,000 thru 260,000 Btu/hr. 2 Venting (continued) Installation & Service Manual 3 Gas connections Gas Supply Verify that the appliance is supplied with the type gas spec i fied on the rating plate. This appliance is orificed for operation up to 2000 feet altitude. The ap pli ance will be derated 4% per 1000 feet above 2000 feet el eva tion. Consult the factory for installations above 2000 feet elevation. Field conversions for operation at high altitude must be performed by certified per son nel only. The appliance will be marked to indicate suitability for high al ti tude operation. GAS SUPPLY PRESSURE: Measured at the inlet pres sure tap located upstream of the combination gas valve(s) see FIG. 3-5, page 22. TABLE - 3A GAS SUPPLY PRESSURE Max. (Inches Water Column) Natural Gas LP Gas 14 14 Min. (Inches Water Column) 4.5 11 Maximum inlet gas pressure must not exceed the val ue specified. Minimum value listed is for the purposes of input adjustment. MANIFOLD PRESSURE: Measured at the pres sure tap on the downstream side of the com bi na tion gas valve(s) (see FIG. 3-5, page 22). The gas regulator settings for single stage and two stage operation are factory set to supply proper manifold pressure for normal operation. To check manifold pressure, see Manifold Ad just ment Procedure. Do not increase manifold pressure beyond spec i fied pressure settings shown below in Table 3B. Gas Pressure Test 1. The appliance must be disconnected from the gas supply piping system during any pressure testing of that system at a test pressure in excess of 1/2 PSIG (3.5kPa). 2. The appliance must be isolated from the gas supply piping system by closing a manual shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or less than 1/2 PSIG (3.5kPa). 3. The appliance and its gas connection must be leak-tested before placing it in operation. Gas Connection 1. Safe operation of the appliance requires properly sized gas supply piping. See data in Table 3C. 2. Gas pipe size may be larger than appliance gas connection. 3. Installation of a union is suggested for ease of service, see FIG. 3-1 on page 19. 4. Install a manual main gas shutoff valve, outside of the appliance gas connection and before the gas valve or manifold connection, when local codes require. 5. A trap (drip leg) MUST be provided by the installer in the inlet of the gas connection to the appliance, see FIG. 3-1 on page 19. 6. The combination gas valve has an integral vent lim it ing device and does not require venting to atmosphere, outside the building. 7. Optional gas controls may require routing of bleeds and vents to the atmosphere, outside the building when required by local codes. TABLE - 3B MANIFOLD PRESSURE Input Gas Btu/hr Single and Two-Stage Two Stage Full or High Fire Settings Low Fire Settings Natural Gas LP Gas Natural Gas LP Gas 45,000 3.5" 10" 0.9" 2.5" 75,000 2.4" 7" 0.9" 2.5" 90,000 - 180,000 3.5" 10" 0.9" 2.5" 215,000 - 260,000 3.5" 10" 0.9" 2.5" TABLE - 3C FITTINGS TO EQUIVALENT STRAIGHT PIPE Diameter Pipe (inches) 3/4 1 1 1/4 1 1/2 2 3 4 5 Equivalent Length of Straight Pipe (feet) 2 2 3 4 5 10 14 20 TABLE - 3D GAS CONNECTIONS Btu/hr INPUT Pipe Size 45,000 - 135,000 1/2" 180,000 - 260,000 3/4" Installation & Service Manual 3 Gas connections (continued) TABLE - 3E GAS PIPING SIZE CHART Nominal Iron Pipe Size Inches Length of Pipe in Straight Feet Maximum Capacity of Pipe in Thousands of Btu/hr per hour for gas pressures of 13.5 Inches Water Column (0.5 PSIG) or less and a pressure drop of 0.5 Inch Water Column (Based on NAT GAS, 1025 Btu/hr per Cubic Foot of Gas and 0.60 Specific Gravity) 10 20 30 40 50 60 70 80 90 100 125 150 175 200 3/4 369 256 205 174 155 141 128 121 113 106 95 86 79 74 1 697 477 384 328 292 267 246 226 210 200 179 164 149 138 1 1/4 1,400 974 789 677 595 543 502 472 441 410 369 333 308 287 1 1/2 2,150 1,500 1,210 1,020 923 830 769 707 666 636 564 513 472 441 2 4,100 2,820 2,260 1,950 1,720 1,560 1,440 1,330 1,250 1,180 1,100 974 871 820 2 1/2 6,460 4,460 3,610 3,100 2,720 2...
Este manual também é adequado para os modelos :Aquecedores de Água - 000 - 260 (5.26 mb)
Aquecedores de Água - 45 (5.26 mb)