Supply Fan Adjustment - Trane RT-SVX19A-E4 Installation Operation & Maintenance

Supply fan adjustment

Use the following procedure to
determine the proper adjustment of
the supply fan for a specific
application.
1. Determine total external static
pressure about system and
accessories.
a. Obtain the design airflow rate
and the design external static
pressure drop through the
distribution system.
Table 6 - Motor sheave / Fan speed
6 turns
UNIT Open
YKD/YKH 155 566
YKD/YKH 175 724
YKD/YKH 200 513
YKD/YKH 250 588
TKD/TKH 155 566
TKD/TKH 175 724
TKD/TKH 200 513
TKD/TKH 250 588
WKD/WKH 125 533
WKD/WKH 155 566
WKD/WKH 200 513
6 turns
UNIT Open
YKD/YKH 155 672
YKD/YKH 175 791
YKD/YKH 200 680
YKD/YKH 250 690
TKD/TKH 155 672
TKD/TKH 175 791
TKD/TKH 200 680
TKD/TKH 250 690
WKD/WKH 125 724
WKD/WKH 155 513
WKD/WKH 200 588
RT-SVX19A-E4
Installation
b. Add static pressure drop of the
accessories installed on the
unit. (Table 7,8 & 9)
c. Add the total accessory static
pressure drop (from step 1b) to
the design external static
pressure (from step 1a). The
sum of these two values is the
total system external static
pressure.
Fan Speed (RPM)
5 turns 4 turns
Open Open
601 637
769 815
550 586
619 650
601 637
769 815
550 586
619 650
566 600
601 637
550 586
Fan Speed (RPM)
5 turns 4 turns
Open Open
714 756
840 890
711 742
722 754
714 756
840 890
711 742
722 754
769 815
550 586
619 650
2. Using the Tables 10 through 20 to
3. Adjust motor sheave according
Standard Drive
3 turns 2 turns
Open Open
672 708
860 906
623 659
681 712
672 708
860 906
623 659
681 712
633 667
672 708
623 659
Oversized Drive
3 turns 2 turns
Open Open
798 840
939 989
773 804
786 818
798 840
939 989
773 804
786 818
860 906
623 659
681 712
find the external static pressure
that most closely approximates
total system external static
pressure. Then locate the
appropriate airflow rate for your
unit. The value obtained
represents the brake horsepower
for the supply fan motor and the
fan RPM.
to Table 6.
1 turns
Open Closed
743 N/A
951 N/A
696 N/A
743 N/A
743 N/A
951 N/A
696 N/A
743 N/A
700 N/A
743 N/A
696 N/A
1 turns
Open Closed
882 N/A
1038 N/A
835 N/A
850 N/A
882 N/A
1038 N/A
835 N/A
850 N/A
951 N/A
696 N/A
743 N/A
15