The spa pump connects to the spa motor and is used to force water through the jets. Without the pump, your spa can not circulate water and will not work properly. Because there are so many types and designs of pumps, the steps below are only guidelines. Performs the steps in the order shown, but use your owner's manual in case of any variation in your pump model.
Step 1: Disconnect Power
Before you begin work on your spa pump, disconnect all power running to the spa or the spa motor. Remember that water and electricity do not mix and that failure to disconnect the power supply could result in severe injury, even death. In most cases, the power supply is a dedicated circuit breaker that can be turned off during installation, but some models may require physically disconnecting wires, or may even provide for a shut switch in some other location.
Step 2: Locate Water Supply and Outlet Connections
Study the pump and the hot tub itself. Locate the water supply and drain connectors. Be sure that the ends are free of debris, including dirt, leaves or other unwanted matter. Clean any dirt of mud from the the threaded ends. If desired, place a piece of tape over the connectors to protect them until needed.
Step 3: Attach the Pump
Install the spa circulation pump. In general, the pump is mounted on or near the motor assembly. Most models connect using 4 to 8 bolts, but other models connect differently. When tightening the bolts, snug them in a clockwise pattern and then go back and tighten them down. The tightening pattern keeps the pump flush against the mounting bracket, preventing problems with leaks later.
Step 4: Attach Suction and Discharge
Attach the connectors for suction and drainage. Be sure that these connectors are tight, or else the pump will leak profusely. Some connectors will use wing-nut style connections, but others will require the use of a large wrench, possibly as large as a pipe wrench. For improved fit and easier installation, put one drop of oil on the connector threads before installing the connectors.
Step 5: Test the System
Turn on the power to the system. If the circuit breaker does not trip immediately, activate the motor. Make sure that the pump is providing strong suction and that the jets have a sufficient amount of pressure coming through them. Correct any leaks that you can find.
Notes on Generic Installation
As vague as these steps may seem, they will make more sense when you have a pump in hand. The device is relatively simple, usually a single rotor shaft that creates suction flow and force water out of a jet. In general, most pumps have fewer than 10 connections in all, including the mounting bolts and the water supply and drain connectors.