Installation Instructions for Float Switch(s) on RV Fresh Water Tank
You will need:
- Installation kit
- Teflon Tape
- 1 ¼” hole saw
- Drain fresh water tank
- Determine the location of tank and expose a side that allows you to access to drill holes. Install the first float as high as possible on side of the tank. This is the point where the tank will shut off when filling. If this is the only float, the system will start when the water drops enough to allow the float to open. If you are installing two floats, put the 2nd float at about 2/3 full mark of the tank. This is the point where the RO system will turn back on with a two float system. You can select a higher or lower point depending on how low you want the tank to get before filling back up.
- Place the flange on the upper side of the tank where you want it and make sure that the whole flange is below the top of the tank. Mark the center of the flange on the tank. Set the flange aside and drill a 1 ¼” hole. Repeat process for 2nd float if required.
- Place the flange in the hole and make sure it fits snugly against tank. You may have to enlarge the hole slightly with a round file or grind with your drill. When the 1 ¼” hole is right, the flange will push in snugly and stay in position on its own. Repeat for 2nd flange if using two floats.
- With flange in place, mark it and tank so that you can remove and replace it in the same spot after drilling screw holes.
- Drill four 3/32” holes though flange and tank side. Remove the flange then drill the flange holes out to 9/64” or 5/32”, leaving the tank holes at 3/32”
- Place a ¼” bead of silicone on inside lip of the flange, all around the surface where it will contact the tank. Push flange into the 1 ¼” hole and align the screw holes. Screw the stainless steel screws into the holes snugly, but don’t overtighten. Some silicone may push out the sides of the flange.
- Mark the top of the float and the flange so that, when tightened, the float arm is down.
- Wrap Teflon tape two or three rimes around the float threads. Screw into flange snugly until the marks are aligned. Repeat steps 5-9 if 2nd float is used
- Allow the silicone to dry for 1 day before filling tank
- Use RO float wiring diagram on following page to connect float(s) to TLC