User guide
Page 8 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 ts 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, rell 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 reective 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, Downow 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 specic positions to direct the ow of water to backwash, regenerate, rinse or rell. 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 dened by a number of pulses. The counter is zeroed each time the valve
goes to the service position. The PC board nds 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 exibility and
requires no switches or cams (U.S. Patent 6444127).
The downow piston is used when the control valve is used as a downow softener, regnerating lter or non-regenerating lter. If
the control valve is used as a softener or a regenerating lter, a regenerant piston must be attached to the downow 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 downow piston is used when the WS1TC control valve is used as a downow softener, regenerating lter or
non-regenerating lter.
2. A 1.5" diameter downow piston is used when the WS1.25TC control valve is used as a downow softener, regenerating lter
or non-regenerating lter.
If the control valve is used as a softener or a regenerating lter, 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 ow 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 ngers.
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.