LX JA50 Circulation Pump 0.5HP

Name: LX JA50 Circulation Pump 0.5HP
SKU: PC-JA500
Availability: InStock

£83.52 Inc VAT

93 in stock

SKU: PC-JA500 Categories: LX, LX Circulation Pumps, Pumps and Pump Parts, Stock Monitoring

Description

🛁 LX JA50 Circulation Pump – 0.5 HP Single Speed

Reliable, Low-Energy Circulation for Efficient Spa Filtration and Heating

💧 Product Overview

The LX JA50 is a versatile 0.5 HP single-speed circulation pump engineered for hot tubs and whirlpool baths requiring dependable water circulation at minimal energy consumption. Manufactured by LX, a leading name in spa pump technology, the JA50 delivers a maximum flow rate of 180 litres per minute with a 10-metre head pressure, offering an excellent balance of performance and efficiency for small to medium spa systems.

Featuring a centre discharge design with self-draining capability, this pump automatically drains when the motor shuts off, protecting both the pump and your system from potential damage. The thermally protected motor ensures reliable, long-lasting operation whilst drawing only 2 amps, making it highly economical for continuous circulation duties. The optional air switch facility provides manual on/off control, ideal for whirlpool bath installations.

Commonly found in Chinese manufactured spas including AMC Winer Spa and Spa Serve, the JA50 provides efficient and reliable operation in spa and whirlpool systems where performance and energy efficiency are equally important.

✨ Key Features

✅ 0.5 HP Motor Power – Delivers 0.37 kW of efficient circulation power

✅ Energy Efficient – Low 2 amp draw for cost-effective continuous operation

✅ Single Speed Operation – Reliable 2,900 RPM motor for consistent filtration duty

✅ Self-Draining Design – Centre discharge enables automatic draining when pump stops

✅ Compact Dimensions – Space-saving 325 × 155 × 185 mm footprint

✅ 1.5″ Plumbing Connections – Universal suction and discharge ports

✅ Thermal Motor Protection – Built-in protection extends motor lifespan

✅ 7µF Capacitor – Ensures reliable motor starting

✅ Optional Air Switch – Compatible with pneumatic button control for manual operation

✅ 180 L/min Flow Rate – Strong circulation for effective filtration and heating

⚙️ Technical Specifications

Specification	Value
Pump Type	Circulation Pump
Motor Power	0.5 HP / 0.37 kW
Speed Settings	Single Speed
Flow Rate (Maximum)	180 L/min
Maximum Head	10 m
Amperage	2.0 A
Motor Speed	2,900 RPM
Wet End Configuration	1.5 inch Centre Discharge
Discharge Port	1.5 inch
Suction Port	1.5 inch
Port Position	Centre Discharge
Dimensions (L × W × H)	325 × 155 × 185 mm
Capacitor	7 µF
Thermal Protection	Built-in

🔌 Electrical Requirements

Electrical Specification	Requirement
Full Load Amperage	2.0 A
Capacitor Rating	7 µF
Motor Protection	Thermally protected

⚠️ IMPORTANT ELECTRICAL SAFETY NOTICE:

All electrical work must be carried out by a qualified electrician in accordance with UK wiring regulations (BS 7671). Hot tubs and spas require RCD protection (30mA) for safety. Never attempt electrical installation yourself unless you are a qualified professional. Incorrect installation may invalidate warranty and poses serious safety risks.

🔗 Compatibility Guide

Plumbing Specifications

Connection	Size
Suction Port	1.5 inch
Discharge Port	1.5 inch
Wet End Style	Centre Discharge

This Pump Features:

📍 Wet End: 1.5 inch centre discharge
📍 Discharge: 1.5 inch
📍 Suction: 1.5 inch
📍 Design: Self-draining capability

Compatible Spa Brands:

✅ AMC Winer Spa
✅ Spa Serve
✅ Chinese manufactured spas

🛠️ Installation Requirements

Mounting Specifications

Requirement	Specification
Mounting Position	Horizontal
Base	Solid, level, vibration-dampening surface
Ventilation	Adequate clearance for motor cooling
Access	Sufficient space for maintenance

Plumbing Connections

Connection	Size
Suction	1.5 inch
Discharge	1.5 inch

Installation Notes

⚠️ Pump must be installed below water level (flooded suction) to ensure proper priming

⚠️ Never run the pump dry – this causes seal damage and potential motor failure

⚠️ Ensure proper electrical bonding to earth in accordance with BS 7671

⚠️ Centre discharge design allows self-draining when motor is switched off

🔧 Maintenance Guide

Routine Maintenance Schedule

Task	Frequency	Notes
Check for leaks	Monthly	Inspect around seal and union connections
Inspect unions	Monthly	Tighten if necessary
Clean strainer/filter	As needed	Remove debris to maintain flow rate
Check amperage draw	Annually	Should match 2.0A rating
Inspect motor vents	Quarterly	Keep clear of debris
Check mounting bolts	Quarterly	Tighten if loose

Warning Signs – Replace Pump If:

⚠️ Unusual noise such as grinding, screeching, or humming
⚠️ Water leaking from the seal area
⚠️ Motor trips the circuit breaker repeatedly
⚠️ Significantly reduced water flow
⚠️ Motor overheating or shutting down on thermal protection

♨️ Ideal Applications

Application	Suitability	Notes
♨️ Hot Tub Circulation	Excellent	Ideal for small to medium spas
♨️ Spa Filtration	Excellent	Energy-efficient continuous duty
🛁 Whirlpool Bath	Excellent	Compatible with air switch control
♨️ Heating Circulation	Good	Adequate flow for heating loop duties

❓ Frequently Asked Questions

Q: What horsepower is the LX JA50 pump?

A: The LX JA50 is a 0.5 HP (0.37 kW) circulation pump with a single-speed motor running at 2,900 RPM.

Q: Will this pump fit my hot tub?

A: The JA50 features 1.5-inch suction and discharge ports with a centre discharge wet end. It’s commonly used in Chinese manufactured spas including AMC Winer Spa and Spa Serve. Verify your existing pump specifications before ordering.

Q: What is the amperage draw?

A: The JA50 draws only 2 amps, making it energy-efficient for continuous circulation duties.

Q: Can I use this pump with an air switch?

A: Yes, the JA50 features an optional air switch facility for manual on/off control, making it suitable for whirlpool bath installations.

Q: What is the maximum flow rate?

A: The JA50 delivers a maximum flow rate of 180 litres per minute with a maximum head of 10 metres.

Q: What size are the plumbing connections?

A: Both suction and discharge ports are 1.5 inches. The pump features a centre discharge configuration with self-draining capability.

Q: Is this pump self-draining?

A: Yes, the centre discharge design allows the pump to self-drain when the motor is switched off, protecting the system from potential damage.

Q: What capacitor does this pump use?

A: The JA50 uses a 7µF capacitor for reliable motor starting.

Q: How does the JA50 compare to the JA35?

A: The JA50 offers more power (0.5 HP vs 0.33 HP), higher flow rate (180 L/min vs 150 L/min), greater head pressure (10m vs 8m), and slightly higher amperage draw (2A vs 1.6A), whilst sharing the same compact dimensions.

🏆 Why Choose the LX JA50

✅ Balanced Performance – 0.5 HP motor delivers 180 L/min for effective circulation

✅ Energy Efficient – Only 2 amp draw for economical running costs

✅ Compact Size – Space-saving 325 × 155 × 185 mm dimensions

✅ Self-Draining Design – Centre discharge protects system when switched off

✅ Thermally Protected – Built-in motor protection for longevity

✅ Air Switch Compatible – Optional manual control for whirlpool baths

✅ Proven Reliability – Trusted LX manufacturing quality

✅ Versatile Application – Suitable for hot tubs, spas, and whirlpool baths

🤝 Why Buy From Parts4Tubs

✅ UK-Based Company – Local support from knowledgeable spa specialists

✅ Fast UK Delivery – Quick despatch to get your spa running again

✅ Expert Advice – Our team can help with compatibility questions

✅ Competitive Pricing – Trade-quality parts at fair prices

✅ Full Warranty Support – Comprehensive warranty backing

✅ Easy Returns – Hassle-free returns within 30 days if unused

✅ Replacement Parts Available – Seals, capacitors, and spares in stock

⭐ Summary

The LX JA50 is a reliable, energy-efficient 0.5 HP single-speed circulation pump delivering 180 L/min flow rate with 10m head pressure for small to medium hot tubs and whirlpool baths. Drawing only 2 amps, it features 1.5-inch plumbing connections, centre discharge self-draining design, thermal motor protection, and optional air switch compatibility. Commonly used in Chinese manufactured spas including AMC Winer Spa and Spa Serve, it offers excellent value where performance and efficiency are both priorities. Order from Parts4Tubs for fast UK delivery and expert support

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	1.5 inch Union O-Ring	£1.49 Max: 63 Min: 1 Step: 1 Add to cart
	2 inch Union O-Ring	£1.49 Max: 100 Min: 1 Step: 1 Add to cart
	2 to 1.5 inch Threaded Union Adapter	£6.99 Max: 54 Min: 1 Step: 1 Add to cart
	2.5 inch Union O-Ring	£1.49 Max: 100 Min: 1 Step: 1 Add to cart
	2.5 inch Waterway Union with 2 inch Tailpiece	£9.32 Max: 44 Min: 1 Step: 1 Add to cart
	4 pin Amp cord (Dual Speed Pump)	£17.37 Max: 6 Min: 1 Step: 1 Add to cart

The hot tub industry doesnt make it easy for you when you are trying to match up the size of the unions (the part that screws your pipe work onto the pumps) Below you can see the physical sizes of the collars, and how they relate to the actual union size you need. So a measurement of 2.5", edge to edge on the collar of the pump is actually a 1.5" union - confusing - absolutely! If you are not sure, give me a shout!

Hot Tub Pump Collar & Union Size Chart

Imperial & Metric Specifications

Union Size	Collar Size	Thread OD	Union OD	O-Ring Size
1.5" Female Buttress Thread (FBT)	2.5" / 64mm (Tip to Tip) Measurement	2-1/2" 64mm	2-13/16" 71mm	2-5/16" OD 59mm
2" Female Buttress Thread (FBT)	3.1" / 78mm (Tip to Tip) Measurement	3-1/16" 78mm	3-3/8" 81mm	2-15/16" OD 75mm
2.5" Female Buttress Thread (FBT)	3.6" / 91mm (Tip to Tip) Measurement	3-5/8" 91mm	4-1/4" 108mm	3-7/16" OD 87mm

Important Notes

The union "size" (1.5", 2", 2.5") is nominal and doesn't correspond to any actual measurement.

Collar size is measured from thread tip to thread tip on the pump outlet.

Most hot tub pumps use Female Buttress Thread (FBT) - 98% of applications.

O-ring gaskets may vary between manufacturers - measure your existing gasket for accuracy.

How do I Replace a Hot Tub Pump?

Here's a general step-by-step guide on how to replace a hot tub pump. Keep in mind that the specific steps may vary depending on your hot tub's make and model, so it's essential to consult your hot tub's manual for model-specific instructions. If you're not comfortable with this procedure, it's a good idea to seek professional assistance.

Materials You'll Need:

Replacement pump
Pipe wrench
Adjustable wrench
Screwdriver
Pipe sealant (thread tape or plumber's putty)
PVC primer and cement (if you have PVC plumbing)
Teflon tape (for threaded connections)

Procedure:

Turn Off the Power: Before you begin, ensure the hot tub's power supply is turned off at the circuit breaker or disconnect switch. Safety should always be a priority when working with electrical components.
Drain the Hot Tub: If your hot tub is not already empty, you'll need to drain it. Follow your hot tub's manual or manufacturer's instructions for proper draining. (You might not need to do this if you can lock the pump off with the gate valves)
Locate the Pump: Identify the location of the existing pump in your hot tub. It's usually located near the equipment area or in a designated pump compartment.
Disconnect the Electrical Wiring: Carefully disconnect the electrical wiring from the old pump. This typically involves removing the electrical conduit cover, unscrewing wire nuts, and disconnecting the wires from the terminals. Be sure to note the wire connections or take a picture for reference when connecting the new pump.
Disconnect the Plumbing: Depending on your hot tub's plumbing setup, you'll need to disconnect the plumbing connections to the pump. Use a pipe wrench or adjustable wrench to loosen and remove the fittings. Be prepared for some water spillage when disconnecting the plumbing.
Remove the Old Pump: Once the electrical and plumbing connections are detached, carefully remove the old pump from its mounting position. Some pumps may be secured with mounting brackets or bolts.
Prepare the New Pump: If the new pump is not pre-assembled, you may need to attach fittings, unions, or adapters to match your hot tub's plumbing. Ensure that you use the appropriate sealant or Teflon tape on threaded connections to prevent leaks.
Mount the New Pump: Position the new pump in the same location as the old one and secure it in place using the mounting brackets or bolts.
Reconnect Plumbing: Reconnect the plumbing to the new pump, ensuring that all connections are tight and secure. If your hot tub uses PVC plumbing, use PVC primer and cement to bond the connections properly.
Reconnect Electrical Wiring: Reconnect the electrical wiring to the new pump, following the notes or pictures you took earlier. Make sure all wires are properly connected and secure.
Turn On the Power: Restore power to the hot tub by switching on the circuit breaker or reconnecting the disconnect switch.
Test the Pump: Turn on the hot tub's pump to ensure that it's working correctly. Check for any signs of leaks or irregularities in the plumbing connections.
Refill the Hot Tub: Once you've confirmed that the new pump is functioning properly, refill the hot tub with water.
Check for Leaks: Inspect the plumbing connections for any leaks. If you find any, turn off the pump, drain the tub again, and reseal the connections as needed.
Monitor: Keep an eye on the pump and plumbing for the next few days to ensure everything is functioning correctly and that there are no further issues.

Remember that this is a general guideline, and the specific steps may vary based on your hot tub's design. If you're unsure or uncomfortable with any aspect of this process, please do get in touch, happy to help.

How do I know what size hot tub pump I have?

Determining the size of your hot tub pump is an important step when it comes to maintenance or replacement. To find out the size of your hot tub pump, follow these steps:

Check the Manual: The easiest way to determine the size of your hot tub pump is to consult the owner's manual or user documentation that came with your hot tub. The manual typically contains detailed information about the specifications and components of your hot tub, including the pump.
Look at the Pump Housing: If you don't have access to the manual or it doesn't provide the information you need, inspect the pump itself. Most hot tub pumps have a label or plate on the pump housing that displays essential details, including the pump's model number, manufacturer, and specifications. You can then send that to me or Google it.
Measure the Pump: If the label is missing or damaged, you can measure the pump's dimensions. Measure the diameter of the pump's wet end (the part where the water flows) and the length of the wet end. These measurements can help identify the size and capacity of the pump.
Consult the Manufacturer: If you can't find the information on the pump or in the manual, contact the hot tub manufacturer or a reputable dealer. Provide them with your hot tub's model and serial number, and they should be able to identify the correct pump size for your specific hot tub.
Online Research: You can also search online using the pump's model number or hot tub's make and model. Many manufacturers provide detailed information about their products on their websites, and you may find specifications for your pump model.

Once you have determined the size and specifications of your hot tub pump, you can proceed with maintenance, repairs, or replacement if necessary. Keep in mind that replacing a hot tub pump with the same size and capacity as the original is crucial to ensure proper water circulation and filtration in your hot tub. If you're unsure about any aspect of this process, get in touch, always happy to help.