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r <br /> GENERAL. INFORMATION-CONTINUED <br /> Combustion Air Requirements-Continued <br /> Table 8. Determining Confined Space Combustion Air Requirements <br /> Letter* Air Source Required Opening' Size Calculate Combustion Air <br /> Requirements <br /> A Air inside building 1 square inch free area per 1000 BTUh Add total BTUh of all appliances in <br /> Never<100 square inches free area for each opening confined space and divide by figures <br /> B Outside air through duct 1 square inch free area per 2000 BTUh at left for square Inch free area size of <br /> C Direct outside air 1 square Inch free area per 4000 BTUh each(top and bottom)opening <br /> *See Figure 4. <br /> Acoustical Considerations <br /> Refer to sound level data listed in Technical Data section when determining unit location based on acoustical <br /> considerations. <br /> Technical Data <br /> Table 9,Table 10, Table 11,and Table 12 list unit technical data. <br /> Table 9. Technical Data for UBX and UBZ Models (Unit Sizes 030-125) <br /> Un It Size Unit of, <br /> Parameter 030 045 069 075 1 100 125 Measurement <br /> Input heating capacity 30,000 45,000 60,000 75,000 105,000 120,000 BTUh <br /> 8.8 13.2 17.6 22.0 30.8 35.2 kWh <br /> Thermal efficiency 82 82 83 % <br /> 24,600 36,900 49,200 61,500 87,150 99,600 BTUh <br /> Output heating capacity 7.p 1 10.8 14.4 1 18.0 25.6 1 29.2 kWh <br /> Gas connection,natural2 1/2 1/2 1/2 <br /> Gas connection,propane2 1/2 1/2 1/2 <br /> Inches <br /> Vent connection diameter3 4 4 4 <br /> Combustion air inlet diameter UBZ models)3 4 4 4 <br /> Control,24V 1.0 1.0 1.0 <br /> Full load amps, 1 i5V(UBX models) 3.7 7.1 13.0 <br /> Full load amps,i 15V UBZ models) 3.7 7.1 7.3 13.2 Amps <br /> Maximum overcurrent protection i 15V)4 15 15 30 <br /> Discharge air temperature rise <br /> minimum/maximum 45/75 45/75 45/75 F <br /> Minimum air volume 304 456 607 759 1076 1230 cfm <br /> 8.6 12.9 17.2 21.5 30.5 34.8 Meter'/minute <br /> 506 759 1012 1265 1793 2049 cfm <br /> Maximum air volume 14.3 21.5 28.7 35.8 50.8 58.0 Meter' <br /> /minute <br /> Discharge air opening area 0.96 1.25 2.01 Foote <br /> 0.09 0.12 0.19 McIW <br /> Minimum output velocity 316 475 486 607 535 612 fpm <br /> 96 143 143 179 160 183 Meter/minute <br /> Maximum output velocity 527 791 810 10112 892 1020 fpm <br /> 159 239 239 299 267 305 Meter/minute <br /> Standard blower motor size 1/6 11/3 1 3/4 Horsepower <br /> Blower fan size 9 x 6 9 x 6 10 x 10 Inches <br /> Sound level @ 15 feet 40 1 40 1 49 54 1 55 dba <br /> 'CSA ratings for elevations up to 2,000 feet. <br /> 2Size shown Is for gas connection to a single-stage gas valve-not supply line size. <br /> 3Smaller and/or larger vent and combustion air pipe diameters may be permissible.Refer to appropriate venting Instructions listed in Table 1. <br /> 4MOCp=2.25 x largest motor FLA *smallest motor FLA,Answer Is rounded to the next lower standard circuit breaker size. <br /> 12 1-USX-UBZ-UDX-UDZ(04-21)1034344-0 <br />