Watts W100F - Manual (Page 8)

Page WS1TC & WS1.25 TC Manual
Drive Assembly
The drive assembly consists of the following parts:
• Drive Bracket
• Printed Circuit (PC) Board
• Motor
• Drive Gears
• Drive Gear Cover
The drive bracket holds the PC board, the motor, the drive gears and the drive gear cover in place.
The PC board receives and retains information, displays the information, determines when to regenerate and initiates regeneration.
The PC board powers the motor. The PC board’s two-prong jack connects wires to the direct current (DC) motor. The motor is held
in place on the drive bracket by a spring-loaded clip and a small bulge in the plastic, which fits in one of the slots on the motor
housing. The motor turns drive gears that drive the piston to cycle positions for backwashing, regeneration, rinsing, refill or service.
The motor is fully reversible (turns both ways) and changes direction of rotation to change the direction of piston motion. The motor
is easily replaced if necessary.
There are three drive gears held in place by the drive gear cover. All three drive gears are the same size. A reflective coating is
applied to the gears. As the center drive gear turns a light shines on the coating and a light sensing diode determines if a light pulse
was returned. The PC board counts the pulses and determines when to stop driving the motor.
Drive Cap Assembly, Downflow Piston and Regenerant Piston
The drive gears turn the main gear of the drive cap assembly, which moves the piston. The screw-driven, horizontally moving
piston stops at specific positions to direct the flow of water to backwash, regenerate, rinse or refill. The PC board determines the
position of the piston by counting pulses produced when the piston is moved. An optical sensor looking at one of the reduction
drive gears generates these pulses. Each cycle position is defined by a number of pulses. The counter is zeroed each time the valve
goes to the service position. The PC board finds the service position by noting the increase in current delivered to the motor when
the mechanical stop at the service position is reached. This method of controlling piston position allows for greater flexibility and
requires no switches or cams (U.S. Patent 6444127).
The downflow piston is used when the control valve is used as a downflow softener, regnerating filter or non-regenerating filter. If
the control valve is used as a softener or a regenerating filter, a regenerant piston must be attached to the downflow piston. If the
control valve is to be used on system that does not require a regenerant to be added, the regenerant piston must be removed.
One of two main pistons is always used:
1. A 1.25" diameter downflow piston is used when the WS1TC control valve is used as a downflow softener, regenerating filter or
non-regenerating filter.
2. A 1.5" diameter downflow piston is used when the WS1.25TC control valve is used as a downflow softener, regenerating filter
or non-regenerating filter.
If the control valve is used as a softener or a regenerating filter, a regenerant piston must be attached to the main piston. If the
control valve is to be used on a system that does not require a regenerant to be added, the regenerant piston must be removed.
Spacer Stack Assembly
The spacer stack assembly provides the necessary flow passage for water during the different cycles. The all-plastic spacer stack
assembly (U.S. Patent 6402944) is a one-piece design which allows the stack to be removed using your fingers.
The exterior of the stack is sealed against the body bore with self lubricating EPDM o-rings, while the interior surface is sealed
against the piston using slippery self cleaning directional (one-way) silicone lip seals. The lip seals are clear and have a special
slippery coating so that the piston does not need to be lubricated.