With the cost of electricity continuing to increase, it is a good idea to replace a single speed motor with a more energy efficient 2-speed motor. This guide will explain how to install a 2-speed motor as well as add an Intermatic T-106 timer to control the high and low speeds. Although this guide is specific to replacing a Sta-Rite Dura-Glas motor, most of the steps can be applied to other models of pumps.
The first steps will involve installing the T106 timer next to an existing T104 timer.
Locate an area on the wall near the existing timer for the T106. Locate the timer out of reach of the sprinklers or drainage spouts.
At this point the T106 is installed onto the wall. We will now replace the motor on the pool pump. After the motor is installed we will return to the timers to complete the wiring part of the installation.
The next steps will involve removing the old motor from the pump and installing the new 2-speed motor.
The motor is now completely disconneccted and can be lifted out to be worked on in a more convenient area.
The next steps will involve installing the new motor onto the existing Sta-Rite Dura-Glas pump. Every part will be reused from the old pump except for the new shaft seal and o-rings. All o-rings and shaft seals should be replaced whenever a new motor is installed.
Attach the motor to the seal plate with the four existing motor bolts. Use a 9/16" socket to tighten the bolts. Note: Make sure you feed the two longer bolts through the motor base and then into the seal plate. The seal plate will be damaged if the two longer bolts are installed without the motor base in place.
Unscrew the two screws that hold the cover over the back end of the motor. Remove the cover to expose the electrical connectors.
Thread a 1/2" conduit adapter into the hole near the back of the motor.
The next steps will involve connecting the cables to the new motor.
Note: It is easier to connect the wires to the motor before the motor is connected to the pump.
With a wire stripper, strip away approximately 1/2"-3/4" of the colored insulation from the red, black, and white wires.
Feed all four wires through the conduit adapter that was threaded into the motor.
Connect the black wire to "L1" terminal. This will be the "hi speed" line. Connect the white wire to to the "L2" terminal. This will be the "common" line. Connect the red wire to the "A" terminal. This will be the "low speed" line. Finally, connect the exposed copper or green line to the green screw. This is the "ground" line.
The next steps will involve wiring the pump to the timers and the T106 to the T104.
A jumper will need to be installed in order to connect terminals 1 and 4 in the T106 timer. A jumper is basically a small cable that connects the terminals. You can use a small piece of cable from the 14-3 cable. It does not matter what color. Strip a 1/2" from either end. Connect one end to terminal 1 and the other to terminal 4. This is displayed in the picture with a red cable.
In this step you will need to measure and cut another jumper. This jumper will have to be long enough to run from terminal 1 in the T106 timer to terminal 2 in the T104 timer. This will be diplayed in the picture by a red cable running underneath the first jumper. At this point, one end of the jumper can be connected to terminal 1 in the T106 timer. In a later step we will feed this jumper through a conduit to terminal 2 in the T104 timer.
The next cables to be measured and cut will be the cables that connect the motor from the T106 to terminals 1 and 3 on the T104 timer. Remove the T106 white motor cables terminals A and 3. Remove the metal ends from the motor cables. Measure and cut 2 cables long enough to reach from the T106 timer to terminals 1 and 3 in the T104 timer. Using wire nuts, connect one cable to each of the motor cables. Eventually these lines will be fed through a conduit to the T104 timer. The motor cables are represented with green lines in the picture.
Feed the cables running from the pool motor and feed them through the conduit adapter and into the T106 timer.
Loosen the green screw at the bottom of the T106 timer. Loop the green ground wire around the screw and tighten the screw. Make sure that the piece of ground wire that loops the ground screw has been stripped so the copper is exposed. This same ground line will be fed through the conduit to the T104 timer in the next few steps. This will ground the pump, T106, and T104 together.
Feed the white common line from the pump, the second jumper, the 2 timer motor wire leads, and the ground line through conduit to the T104 timer.
Connect the 2nd jumper line from terminal 1 in the T106 timer to terminal 2 in the T104 timer. Connect the T106 motor leads to terminals 1 and 3 in the T104 timer. Connect the white common line from the pump to terminal 4 in the T104 timer. Lastly, connect the green ground line to the ground screw inside the T104 timer box. The diagram will show what the completed connection should look like. Click on the image to enlarge.
The T106 timer should now be successfully connected to the T104 timer. The T104 will now control the low speed when the T104 is in the ON position. We will now set the trippers on the both timers. This will control when the pump turns on and when it will switch to the high speed.
The T104 timer should be set first. The T104 will control the low speed of the timer. We recommend running the low speed the majority of the day. You may use the low speed the entire day if you only require the high speed to manually vacuum the pool or backwash the filter.
The next steps will demonstrate how to set the trippers. The trippers will determine when the equipment will turn on and off.
The Intermatic T104 Series Timer is now programmed. Next you will need to set the T106 timer. Again, The T106 will turn the high speed on and off. You will want to set the high speed to run while the T104 is on. Example: If the T104 turns the low speed on at 8am and off at 4pm, the T106 should be set to turn on at 12pm to 2pm (each pool is different so set the schedule to your preference). To set the T106 timer, repeat steps 59-65.