Economizer Damper Adjustment - Trane IntelliPak Installation, Operation And Maintenance Manual

Table 56. Return fan performance—60, 70, 75 tons AC; 73, 80, 89 tons EC (36.5" fan)
CFM
Std. 0.25
Air RPM BHP RPM
12000 459 1.07 502
13000 490 1.27 530
14000 520 1.49 560
15000 552 1.73 590
16000 583 2.00 619
17000 615 2.30 650
18000 646 2.64 680
19000 678 3.01 711
20000 711 3.42 742
21000 743 3.87 773
22000 775 4.36 805
23000 808 4.89 836
24000 840 5.46 868
25000 873 6.08 900
26000 906 6.75 931
27000 939 7.47 963
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

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.
Outside Air & Return Air Damper Operation
The outside air and return air damper linkage is accessible
from the filter section of the unit.The damper linkage
connecting the outside air dampers to the return air
dampers is preset from the factory in the number 1
position. Refer to Table 57
position for the unit and operating airflow (CFM).
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.
Note: Bridging between the unit's main supports may
consist of multiple 2 by 12 boards or sheet metal
grating.
RT-SVX36K-EN
Negative Static Pressure
0.50 0.75
BHP RPM BHP RPM
1.59 541 2.13 578
1.83 567 2.40 603
2.09 595 2.70 628
2.38 623 3.03 655
2.70 652 3.39 682
3.05 681 3.78 710
3.43 711 4.20 739
3.85 741 4.67 768
4.30 771 5.17 797
4.78 801 5.70 827
5.31 832 6.28 857
5.88 863 6.90 887
6.49 894 7.56 918
7.15 925 8.26 948
7.86 956 9.00 979
8.62 987 9.79 1010
for the appropriate linkage
1.00 1.25
BHP RPM BHP RPM
2.71 613 3.31 647
3.01 636 3.65 668
3.34 660 3.99 691
3.70 686 4.39 715
4.09 712 4.82 740
4.52 739 5.28 766
4.98 766 5.78 792
5.48 794 6.31 819
6.02 823 6.90 847
6.60 852 7.51 875
7.22 881 8.17 904
7.89 911 8.88 933
8.60 941 9.63 962
9.35 970 10.42 992
10.16 1001 11.28 1021
11.01 1031 12.18 1052
Arbitrarily adjusting the outside air dampers to open fully
when the return air dampers are closed or; failing to
maintain the return air pressure drop with the outside air
dampers when the return air dampers are closed, can
overload the supply fan motor and cause building
pressurization control problems due to improper CFM
being delivered to the space.
The outside air/return air damper linkage is connected to
a crank arm with a series of holes that allows the installer
or operator to modify the amount of outside air damper
travel in order to match the return static pressure. Refer to
Table 57, p. 127 for the equivalent return air duct losses
that correspond to each of the holes illustrated in
Figure 81, p. 117.
To Adjust the Outside Air Damper Travel:
1. Drill a 1/4" hole through the unit casing up stream of
the return air dampers. Use a location that will produce
an accurate reading with the least amount of
turbulence. Several locations may be necessary, and
average the reading.
Unit Start Up
1.50 1.75
BHP RPM BHP RPM
3.91 681 4.54 713
4.29 700 4.94 731
4.69 721 5.38 751
5.11 744 5.85 771
5.57 767 6.34 794
6.06 792 6.85 818
6.60 817 7.41 842
7.16 844 8.03 867
7.77 871 8.66 894
8.41 898 9.36 920
9.11 926 10.09 947
9.87 954 10.86 975
10.67 983 11.71 1004
11.49 1012 12.59 1032
12.37 1041 13.49 1061
13.33 1071 14.47 1090
Table 49, p. 120
2.00
BHP
5.20
5.64
6.10
6.59
7.14
7.67
8.27
8.89
9.59
10.30
11.06
11.88
12.75
13.67
14.63
15.65
125