Watts Industries WM100SM Operating Manual
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Contents
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15SYSTEM COMPONENTS DESCRIBEDSYSTEM COMPONENTS DESCRIBEDDRIVE ASSEMBLYRemove the valve cover to access the drive assembly.Disconnect the power source plug (black wire) from the PCboard prior to disconnecting the motor or water meter plugsfrom the PC board. The motor plug connects to the two-pinjack on the left-hand side of the PC board. The power sourceplug connects to the four-pin jack. The four-pin jack isbetween the two-pin and three-pin jacks. The water meterplug (gray wire) connects to the three.The PC board can be removed separately from the drive brack-et but it is not recommended. Do not attempt to remove the dis-play panel from the PC board. Handle the board by the edges.To remove the PC board from the drive bracket, unplug thepower, water meter and motor plugs from the PC board. Lift themiddle latch along the top of the drive bracket while pulling out-ward on the top of the PC board. The drive bracket has twoplastic pins that fit into the holes on the lower edge of the PCboard. Once the PC board is tilted about 45˚ from the drivebracket it can be lifted off of these pins. To reinstall the PCboard, position the lower edge of the PC board so that theholes in the PC board line up with the plastic pins. Push the topof the PC board towards the valve until it snaps under themiddle latch, weave the power and water meter wires into theholders and reconnect the motor water meter and power plugs.The drive bracket must be removed to access the drive capassembly and pistons or the drive gear cover. It is notnecessary to remove the PC board from the drive bracket toremove the drive bracket. To remove the drive bracket start byremoving the plugs for the power source and the water meter.Unweave the wires from the side holders. Two tabs on thetop of the drive back plate hold the drive bracket in place.Simultaneously lift the two tabs and gently ease the top ofthe drive bracket towards your body. The lower edge ofthe drive bracket has two notches that rest on the driveback plate. Lift up and outward on the drive bracket todisengage the notches.To reassemble seat the bottom of the drive bracket so thenotches are engaged at the bottom of the drive back plate.Push the top of the drive bracket towards the two latches. Thedrive bracket may have to be lifted slightly to let the threadedpiston rod pass through the hole in the drive bracket. Maintaina slight engaging force on top of the drive bracket whiledeflecting the bracket slightly to the left by pressing on theside of the upper right corner. This helps the drive gearsmesh with the drive cap assembly. The drive bracket isproperly seated when it snaps under the latches on the driveback plate. If resistance is felt before latching, then notchesare not fully engaged, the piston rod is not in hole, the wiresare jammed between the drive bracket and drive back plate,or the gear is not engaging the drive cap assembly.To inspect drive gears, the drive gear cover needs to beremoved. The drive gear cover is held in place on the drivebracket by three clips. The largest of the three clips is alwaysorientated to the bottom of the drive bracket. Before trying toremove the drive gear cover, the drive bracket must beremoved from the drive back plate. The drive gear cover canbe removed from the drive bracket without removing themotor or the PC board. Simultaneously, push in and down onthe large clip at the bottom and the clip on the left-hand sideof the drive bracket behind the PC board. Keep your otherfingers behind the drive gear cover so the drive gears do notdrop on the ground. Replace broken or damaged drive gears.Do not lubricate any of the gears. Avoid getting any foreignmatter on the reflective coating because dirt or oils may inter-fere with pulse counting.The drive gear cover only fits on one way, with the large cliporientated towards the bottom. If all three clips are outside ofthe gear shroud on the drive bracket the drive gear cover slipseasily into place.The drive bracket does not need to be removed from the driveplate if the motor needs to be removed. To remove the motor,disconnect the power and motor plugs from the jacks on the PCService InstructionsFigure 17: Figure 18: Figure 19 Figure 20:: |
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