Alternate Wiring Diagram (B)
This pool was equipped with a 110-vac pump that was connected to a timer. The location
of the pump, timer and PCS1 made wiring the pump to the LX220 controller a challenge. It was
also the customer’s desire to leave the pump wiring as it was. Leave it wired to 110 vac.
NOTE: Most pool pumps can be wired to operate off of either 110 vac or 220 vac by
simply adjusting a jumper inside the rear panel of the pump. In such a case, the pump can be
switched to 220 vac and rewired at the circuit breaker panel for 220 vac. This would enable 220
vac to be present at the pump’s location making power convenient for wiring the LX220 and PCS1
[directly at the support system location]. It also minimizes wiring needs when dealing with a 110-
Wiring the PCS1 [alternate diagram B] uses both relay contacts in the LX220.
The pump operates off of the timer. In order for the solar collection process to occur, it is
important for the pump to operate during the time that the PCS1 would operate. Setting the timer
to operate from 9 a.m. until 9 p.m. should cover the width of time that the solar collection process
The timer width of 12 hours can be adjusted downward by observing either the PCS1 fan
or the LX220’s SOLAR ON
light to determine when it turns on and off.
After observing solar on and off times, simply adjust the timer to operate during your local
solar collection process time. This is estimated to be about 10 hours per day based on current
No solar collection occurs unless the pump is on while the PCS1 fan is on.
PUMP + PCS1 ON TIMER
Alternative Wiring Diagram (C)
Alternate Wiring Diagram (C)
This pool was equipped with a 220-vac pump that was connected to a timer. Both sets of
timer contacts were wired to run the pump. The customer purchased a “MANUAL SYSTEM” and
desired to use the timer to control both the pump and the PCS1.
Wire 220 vac from the timer to the PCS1. Wiring the PCS1 in this alternate diagram C
requires the use of one set of the timer’s power contacts. The other set is used for the pool’s
NOTE: Some pool pumps are 110 vac. In such a case, 220 vac must be ran to the timer
for use by the PCS1 [via the second set of power contacts].
Both the pump and the PCS1 operate off of the same timer. The timer is set to operate
from 11 a.m. until 7 p.m. on sunny days. This covers part of the time that the solar collection
process occurs. In a fully automated system, the solar collection process could start earlier and run
later if heat is available.
Another approach to using timers for low cost semi-automatic operation is to simply use a
different [second] timer for the PCS1. Make sure that both timers are synchronized or the solar
collection process will be degraded.
The PCS1 will cool down the pool if the attic is colder than the pool water!
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