Service manual

Electrical Service Manual V4.0
1
1-9
CENTRAL COMMAND I






SOLID STATE VACUUM TIMER
TIMER CONNECTIONS
The timer is a solid state device that has 6 terminals. The connec-
tions for these pins are as follows:
Pin #1 Switched B+ Power
Pin #2 B-
Pin #3 Switched output of the timer 24V
Pin #4 Switched B+ Power
Pin #5 Timer Input - From squeegee limit switch (24V)
Pin #6 Not Used
TIMER OPERATION
The timer receives an input signal of 24V on pin #5 When this occurs the timer sends power
out on Pin #3 for as long as their is power on Pin #5 and then for 21 seconds after the power
on Pin #5 is removed. This output feeds though a diode to protect the timer assembly from
back feeding voltage.
NON TIMER SYSTEMS
The systems without a timer are very simple. The switch for the squeegee receives power
from the positive buss bar. The switch passes power though it to the vacuum solenoid (re-
lay/contactor). The solenoid then closes its load terminals. When the load terminals close
positive power is sent thru a circuit breaker to the vacuum motor.
If the vacuum will not run check the following:
Wiring to the vacuum motor. Especially the Anderson connector if equipped.
Check the squeegee switch to make sure it has power in and gives power out when it is
turned on.
Try substituting a known good 80 amp solenoid.
Try substituting a know good circuit breaker.