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Installation
15RT-SVX19A-E4
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.
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.
2. Using the Tables 10 through 20 to
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.
3. Adjust motor sheave according
to Table 6.
Table 6 - Motor sheave / Fan speed
Fan Speed (RPM)
Standard Drive
6 turns 5 turns 4 turns 3 turns 2 turns 1 turns
UNIT Open Open Open Open Open Open Closed
YKD/YKH 155 566 601 637 672 708 74 3 N/A
YKD/YKH 175 724 769 815 860 906 951 N/A
YKD/YKH 200 513 550 586 623 659 696 N/A
YKD/YKH 250 588 619 650 681 712 74 3 N/A
TKD/TKH 155 566 601 637 672 708 743 N/A
TKD/TKH 175 724 769 815 860 906 951 N/A
TKD/TKH 200 513 550 586 623 659 696 N/A
TKD/TKH 250 588 619 650 681 712 74 3 N/A
WKD/WKH 125 533 566 600 633 667 700 N/A
WKD/WKH 155 566 601 637 672 708 743 N/A
WKD/WKH 200 513 550 586 623 659 696 N/A
Fan Speed (RPM)
Oversized Drive
6 turns 5 turns 4 turns 3 turns 2 turns 1 turns
UNIT Open Open Open Open Open Open Closed
YKD/YKH 155 672 714 756 798 840 882 N/A
YKD/YKH 175 791 840 890 939 989 1038 N/A
YKD/YKH 200 680 711 74 2 773 804 835 N/A
YKD/YKH 250 690 722 754 786 818 850 N/A
TKD/TKH 155 672 714 756 798 840 882 N/A
TKD/TKH 175 791 840 890 939 989 1038 N/A
TKD/TKH 200 680 711 74 2 773 804 835 N/A
TKD/TKH 250 690 722 754 786 818 850 N/A
WKD/WKH 125 724 769 815 860 906 951 N/A
WKD/WKH 155 513 550 586 623 659 696 N/A
WKD/WKH 200 588 619 650 681 712 74 3 N/A