CAUTION: Some pool pumps were sized smaller and set up to run 24 hours per day for proper
filtration. If the pool water is getting cloudy and a timer is not used, manual operation of the pump
may be required for proper filtration. Or, the pump may be upgraded to provide proper filtration
without running 24 hours a day. See discussion on pump sizing in “Common Questions.”
14. Use a separate circuit breaker for the pool’s support system, which includes power to
the LX220 and the PCS1 via the LX220.
15. The LX220 is UL listed.
16. Option: Use a manual bypass switch for the PCS1 power to manually turn the fan on
without activating the solar controller. This is useful for ventilating the attic without heating the
pool. An alternative method is to unplug the bypass valve’s valve operator [VOR] so it doesn’t
route water to the PCS1 and then turning the LX220 to ON
[manual override]. This also turns the
17. Use a pump manual bypass switch for manual pump operation.
18. DO NOT DIRECT WIRE THE PCS1.Use an outlet box in the attic so the unit
can be unplugged for service needs. Use a double pole cutoff switch for attic power as an
additional safety feature if desired.
19. Some pumps may be wired to run off 110 vac. The pump is usually the source of
power for the LX220 and PCS1. Check first to see if the pump is capable of running off of 220
vac. Most pumps can be simply “switched” at a rear panel to run off 110 or 220 vac. If the pump
can run off of 220 vac, we recommend that the pump be switched and that the power be rewired at
the circuit breaker panel from 110 to 220 vac. This simplifies the electrical wiring.
If the pump only runs off of 110 vac, this power can still be used to run the LX220.
However, a separate electrical run will have to be made to the LX220 from the power panel for
220-vac PCS1 power. This 220 vac is then run from the LX220 [from the power relay] up to the
PCS1. The LX220 power relay controls the PCS1!
ELECTRICAL WIRING DIAGRAM
22 Gauge cable from
LX220 Solar Control
Attic 10K Ohm Thermistor
Temperature Sensor [at peak].
Float Sensor's
White Wires
Wire
Nut
From LX220
SOL Terminals
NOTE: Not drawn to any scale
The attic based solar sensor [thermistor] must be wired “IN-SERIES” [in-line] with the leak detection float’s
white wires [AS SHOWN ABOVE]. The float is a closed circuit switch. If excess water should ever occur inside
the PCS1, the float rises and the switch opens. In AUTO mode, the LX220 interprets this open circuit condition as
a cold attic and shuts the bypass valve off. The LX220 “Solar Sensor Service Req’d” light will then turn ON
indicating a need for service.
1-3
4-6
7-9
10-12
13-15
16-18
19-21
22-24
25-27
28-30
31-33
34-36
37-39
40-42
43-45
46-48
49-51
52-54
55-57
58-60
61-63
64-66
67-69
70-72
73-75
76-78
79-81
82-84
85-87
88-90
91-93
94-96
97-99
100-102
103-105
106-108
109-111
112-114
115-117
118-120
121
