The WUA400BII 4.0 HP LX hot tub pump with 56 frame motor has the larger 2.5" (actual 3.5" OD) threads on the front intake. Featuring 2 speeds, 3450 Rpms on high speed and 1725 RPMs on low speed running on 220 - 240 volts.
Details:
- 4.0 HP
- 220 - 240 Volts
- 12.0 amps on high speed 3450 RPMs
- 4.4 amp on low speed 1725 RPMs
- 56 frame motor
- 2.5" Intake (measures 3.5" across outside)
- 2" discharge (measures 3" across outside)
- Front of face measures 7-1/2"
- Electrical cord not included
- ULc electrical certification for Canada
Whats included:
- 1 x LX 4HP 56 frame pump P/N 56WUA400B-II
- 2 x 2" unions with o-rings
- 1 x Installation and wiring manual
Important.
The foot print of the LX pump is the same as the Waterway brand 4HP pump but the wet end on the LX pump is smaller in diameter. If replacing a Waterway Executive 56 pump with an LX WUA400 the plumbing unions will not directly align, the LX pumps discharge threads are about 3/4" lower and the intake threads are about 1/2" lower when measured from the base up vertically.
If your LX pump was made before 2015, it will have metric threads. LX wet ends and pumps manufactured from 2015 onwards have North American standard threads, which are not compatible with metric threads. Therefore, you will need to replace the unions in your spa plumbing with unions that have North American standard threads.
Horsepower ratings
Choosing a pump based on Horsepower (HP) can be incorrect. The horsepower listed in your spa manual or on the old pump's label may be overinflated, inaccurate, or even left blank. Horsepower ratings on hot tub pumps are often listed as SPL-HP, BHP, MBHP, RHP or S-HP, which is not the same as continuous operating horsepower. Installing an oversized pump in your hot tub can cause significant damage.
To avoid choosing the incorrect pump, confirm if it’s a 48 frame or 56 frame, then use the high-speed Amperage rating listed on the old pump's label to find the correct replacement instead of the horsepower. The amperage rating is listed with both high/low speed for a 2-speed pump.
Determining hot tub pump thread size
Hot tub pump plumbing sizes are nominal and not the actual outside diameter (O.D.) of the threaded intake or discharge. To confirm your old pump thread sizes, use a tape measure and check the diameter of your old pump thread size.
- 1.5” Pump thread measures approx. 2-3/8” Outside Diameter
- 2.0” Pump thread measures approx. 3” Outside Diameter
- 2.5” Pump thread measures approx. 3-5/8” Outside Diameter
Amperage ratings
New hot tub pump amperage ratings may vary slightly for pumps with the same performance rating. The RPMs remain the same 3450 for high-speed and single-speed pumps and 1725 for low-speed for two-speed pumps.
