HORSEPOWER | |||
To Get This | Divide This | By This | |
Horsepower | Kwatts | 0.746 | |
Horsepower | Watts | 746 | |
Horsepower | Torque (ft. lbs.) X RPM | 33000 | |
Horsepower | Torque (ft. lbs.) X RPS | 550 | |
Horsepower required to pump water at a given rate to a given Height,assuming 100% eff. AKA Water | GPM x TDH (ft.) | 3960 | |
Horsepower | GPH X TDH (psi) | 103000 | |
Brake HP | Water HP | Pump eff. |
BLOWER MOTOR SIZE | VOLTS | AMPS | MAXIMUM INCHES OF WATER DEPTH | JETS ONLY RECOMMENDED NUMBER OF JETS |
1 HP | 120V | 6.6 | 35 in. | 5 to 10 |
1-1/2 HP | 120V | 7.4 | 45 in. | 9 to 15 |
2 HP | 120V | 9.3 | 55 in. | 12 to 17 |
1 HP | 240V | 3.9 | 30 in. | 4 to 9 |
1-1/2 HP | 240V | 4.3 | 40 in. | 8 to 13 |
2 HP | 240V | 5 | 50 in. | 12 to 17 |
Measure total depth of water in spa (not total spa depth) |
Add - 1 in. water for each 10 ft. of 2 in. air pipe Add 1/2 in. water for each 90 deg. 2 in. elbow |
Compare your total with maximum inches of water column and select that size or the next size higher blower than your total, in your selected voltage. |
The number of holes in the air channel (both floor and seat) should be approximately 1.6 sq. in. total plus or minus .5 |
1/8 in. hole = .0123 sq. in. 3/16 in. hole = .0276 sq. in. |
5/32 in. hole = .0192 sq. in. 1/4 in. hole = .0491 sq. in. |