132 RT-SVX36G-EN
Unit Start Up
Economizer Damper Adjustment
Exhaust Air Dampers
Verify that the exhaust dampers (if equipped) close tightly when the unit is off. Adjust the damper
linkage as necessary to ensure proper closure. An access panel is provided under each damper
assembly.
Fresh Air & Return Air Damper Operation
The fresh air and return air damper linkage is accessible from the filter section of the unit. The
damper linkage connecting the fresh air dampers to the return air dampers is preset from the
factory in the number 1 position. Refer to Tabl e 48 for the appropriate linkage position for the unit
and operating airflow (CFM).
Note: Bridging between the unit's main supports may consist of multiple 2 by 12 boards or sheet
metal grating.
Arbitrarily adjusting the fresh air dampers to open fully when the return air dampers are closed or;
failing to maintain the return air pressure drop with the fresh air dampers when the return air
Table 47. Return fan performance—60, 70, 75 tons AC; 73, 80, 89 tons EC (36.5” fan)
CFM Negative Static Pressure
Std. 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00
Air RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP
12000 459 1.07 502 1.59 541 2.13 578 2.71 613 3.31 647 3.91 681 4.54 713 5.20
13000 490 1.27 530 1.83 567 2.40 603 3.01 636 3.65 668 4.29 700 4.94 731 5.64
14000 520 1.49 560 2.09 595 2.70 628 3.34 660 3.99 691 4.69 721 5.38 751 6.10
15000 552 1.73 590 2.38 623 3.03 655 3.70 686 4.39 715 5.11 744 5.85 771 6.59
16000 583 2.00 619 2.70 652 3.39 682 4.09 712 4.82 740 5.57 767 6.34 794 7.14
17000 615 2.30 650 3.05 681 3.78 710 4.52 739 5.28 766 6.06 792 6.85 818 7.67
18000 646 2.64 680 3.43 711 4.20 739 4.98 766 5.78 792 6.60 817 7.41 842 8.27
19000 678 3.01 711 3.85 741 4.67 768 5.48 794 6.31 819 7.16 844 8.03 867 8.89
20000 711 3.42 742 4.30 771 5.17 797 6.02 823 6.90 847 7.77 871 8.66 894 9.59
21000 743 3.87 773 4.78 801 5.70 827 6.60 852 7.51 875 8.41 898 9.36 920 10.30
22000 775 4.36 805 5.31 832 6.28 857 7.22 881 8.17 904 9.11 926 10.09 947 11.06
23000 808 4.89 836 5.88 863 6.90 887 7.89 911 8.88 933 9.87 954 10.86 975 11.88
24000 840 5.46 868 6.49 894 7.56 918 8.60 941 9.63 962 10.67 983 11.71 1004 12.75
25000 873 6.08 900 7.15 925 8.26 948 9.35 970 10.42 992 11.49 1012 12.59 1032 13.67
26000 906 6.75 931 7.86 956 9.00 979 10.16 1001 11.28 1021 12.37 1041 13.49 1061 14.63
27000 939 7.47 963 8.62 987 9.79 1010 11.01 1031 12.18 1052 13.33 1071 14.47 1090 15.65
Notes:
1. Max fan RPM 1151 for 36.5" Class I Fan
2. Max motor available 20 HP for 36.5" fan size
3. Max motor available 20 HP for 60, 70 & 75T/ 73, 80 & 89T
4. Max CFM is 27000 for 60, 70 & 75T/ 73, 80 & 89T
5. Min CFM is 12000 for 60, 70 & 75T/ 73, 80 & 89T
6. Return fan belt drive RPM selections will be available to cover 500-1100 RPM range +/- 50 RPM
7. Performance data includes cabinet and rain hood effect. Damper pressure drop will have to be added to return duct static per table Table 40, p. 126
WARNING
No Step Surface!
Do not walk on the sheet metal drain pan. Walking on the drain pan could cause the
supporting metal to collapse, resulting in the operator/technician to fall. Failure to follow this
recommendation could result in death or serious injury.
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