Operation
For normal operation place the switch in the “AUTO” position and adjust the desired pool/spa
temperature setting. The “Power” LED indicator should always be on. (NOTE: During initial power
up, the “POWER indicator will blink for approximately 10 seconds while it stabilizes temperature
readings). The “Heating” LED indicator will show when the system is collecting solar heat. If the
nocturnal cooling function is enabled inside the GL-235, the “Cooling” LED indicator will show when
the system is dissipating excess heat.
In the “AUTO” position, the GL-235 will heat the pool or spa (rotate valve to solar loop) when
the collector (solar) sensor temperature is higher than the pool/spa sensor temperature by 4ºF or
more AND the pool/spa temperature is less than the "Desired Temperature" setting. The GL-235
will stop heating (return valve to pool loop) when the two sensor temperatures get to within 1.5ºF
OR the pool/spa sensor is above the "Desired Temperature" setting.
To test the system, move the switch to “MANUAL TEST” and verify that both the “Heating” and
“Cooling” indicators light and that the valve(s) are in the solar loop position. Move the switch to
“MANUAL OFF” and verify that all indicators except “Power” are off. The valve(s) should be in
the normal recirculating loop position. If the valve(s) positions are working in reverse, follow the
instructions in section marked “Low Voltage (LV) : Solar Valve” to correct. WARNING: If
recirculate freeze protection is being used, do NOT leave the switch in the “MANUAL
OFF” position during cold weather. Also note that the switch does NOT turn power off to the
GL-235.
Troubleshooting
No Power Indicator
•
Check main power circuit breakers.
•
Check fuse
Fuse Replacement
The GL-235 is protected by a fuse located on the left side of the main circuit board. Replace the
fuse with a 2A, type ATO-2 fuse, readily available in most automotive or electronics stores.
If “Heating” is always on
Disable recirculate freeze protection if enabled. Check that the switch is in the “AUTO” position.
Next verify that the control circuitry is operating properly by disconnecting the solar sensor from
the terminal block. The “Heating” LED should go off and the “CHECK SENSOR” LED should begin
to blink. If “Heating” remains on, there is an internal circuit failure and the GL-235 will have to
be returned for repair.
If “Heating” never comes on
Verify that the switch is in the “AUTO” position, the desired pool temperature dial is set higher
(hotter) that the actual pool temperature, and the solar sensor is warmer than the pool water. Also
check that the switch on the valve actuator is NOT in the "OFF" position. Disconnect the pool
sensor from the terminal block and verify that the “CHECK SENSOR” LED turns on. If the “CHECK
SENSOR” LED does not turn on, there is an internal failure and the GL-235 will have to be returned
for repair. Reconnect the pool sensor and verify that the “Check Sensor” LED turns off. Next,
disconnect the “solar” sensor from the terminal block and verify that the “CHECK SENSOR” LED
begins to blink. If the “CHECK SENSOR” LED does not begin to blink, there is an internal failure
and the GL-235 will have to be returned for repair.
GL-235 high voltage output used for Timer Override
Figure 3
58
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