Maintenance
4. Maintenance
The maintenance procedures detailed in this section are to be performed by qualified personnel.
4.1.Timer assembly
The standard timer assembly consists of a (2 minutes per revolution) motor turning a common shaft, which, in turn, rotates eight cams. As the cams rotate, they control various functions and the sequence of the operational cycle.
A label on the timer assembly identifies the individual function of each of the 8 cams. Cams 1 through 8 are positioned from left to right beginning with the “START” cam (cam 1).
START
DET.
DRAIN
FLUSH
SANI.
RINSE
MOTOR PAUSE
HEATER
Timer Assembly Label
Except for cams 1, and 3, all other cams can be user adjusted. The cam positions are all set at the factory and only the cams controlling the chemical pumps (cams 2, 5 & 6) should ever need adjusting. Each micro switch on the timer assembly is turned on and off by the cam its actuator rides on. For all of the cams, except cams 1, 7 and 8, its corresponding switch is ON when its actuator is down in the cam groove. (Cams 1, 7 and 8 are reverse acting and are turned ON when the micro switch actuator is up out of the groove.) Opening the groove of any cam other than cams 1, 7 or 8 will increase the amount of time that the micro switch is held ON. The cams are
4.1.1. Cam Adjustment
The two sides of each cam connect to the shaft with a
1.Turn off the circuit breaker providing power to the machine before accessing the timer assembly.
Caution: One of the terminals on the main power switch remains “hot” even when the machine’s main power switch is turned
2.Remove the two screws securing the front lower panel.
3.Using the timer assembly label, determine which cam is to be adjusted. Double check by counting over from cam 1 to the cam to be adjusted.
4.Determine which edge of the cam groove to be adjusted is the leading edge (contacts the limit switch actuator first when the shaft is rotating) and which edge of the groove is the trailing edge. The leading edge of the cam groove determines when in the cycle the control action begins and should not be changed.
5.Adjust the trailing edge of the cam groove by rotating the appropriate side of the cam in the proper direction to either increase or decrease the cam’s groove; resulting in increasing or decreasing the total time that switch will be held ON.
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