Installation

22
B12LC UNIT
Outdoor Air -40°F Outdoor Air -22°F Outdoor Air -4°F Outdoor Air 14°F Outdoor Air 32°F
Desired Air Temperature Desired Air Temperature Desired Air Temperature Desired Air Temperature Desired Air Temperature
Supply
Air
(CFM)
Supply
Air
(L/s)
55°F 68°F 73°F 55°F 68°F 73°F 55°F 68°F 73°F 55°F 68°F 73°F 55°F 68°F 73°F
kW kW kW kW kW kW kW kW kW kW kW kW kW kW kW
1250 590 14.6 19.9 21.9 11.2 16.5 18.5 7.8 13.1 15.2 4.4 9.7 11.8 1.0 6.3 8.4 1200 566 13.5 18.6 20.6 10.4 15.5 17.4 7.2 12.3 14.3 4.0 9.1 11.1 0.8 5.9 7.9
1150 542 12.6 17.4 19.3 9.6 14.5 16.4 6.6 11.5 13.4 3.6 8.5 10.4 0.7 5.5 7.4
1100 519 11.2 15.9 17.7 8.5 13.2 15.0 5.8 10.5 12.3 3.1 7.7 9.6 0.4 5.0 6.8
1050 495 10.7 15.2 16.9 8.1 12.6 14.3 5.5 10.0 11.7 2.9 7.4 9.1 0.4 4.8 6.5 1000 472 9.9 14.1 15.7 7.4 11.7 13.3 5.0 9.3 10.9 2.6 6.9 8.5 0.2 4.4 6.1
900 425 8.5 12.4 13.8 6.4 10.2 11.7 4.3 8.1 9.6 2.2 6.0 7.5 0.1 3.9 5.4 800 377 7.0 10.4 11.7 5.2 8.6 9.9 3.4 6.8 8.2 1.7 5.0 6.4 - 3.3 4.6 700 330 5.1 8.1 9.3 3.7 6.7 7.9 2.3 5.3 6.5 0.9 3.9 5.1 - 2.5 3.7
Although the B6LC, B1600705 and B12LC models have good efficiencies, the supply air could be colder than the ambient room air. It is possible to eliminate the discomfort associated with this temperature difference by installing an electric duct heater. This will temper the air before it is distributed throughout the building. The tables below gives the heating requirements at different temperatures and airflows. NOTE: The data does not reflect a reduction in effectiveness due to frosting. Based on the standard air at: 1.2 Kg/m3 and Cp = 1.0 KJ/Kg°C 13.35 lb/ft3 and Cp = .24 Btu/lbm°F
Appendix G
MAKE-UP HEAT REQUIREMENTS
B12LC