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Freeze Protection
If you are relying on the collectors naturally draining to provide freeze protection, it is very important that
you use a non-positive seal valve or drill a hole (1/8"--1/4") in the diverter of a positive seal valve to
allow the collectors to drain. Alternatively, the GL-235 control can provide recirculate freeze protection.
If enabled, when the GL-235 senses a freeze condition at the collector sensor, it will allow circulation of
relatively warm water from the pool to the collector panels.
The GL-235 will allow recirculation when the collector temperature falls below 40ºF and will stop
circulation when the collector temperature rises above 42ºF. While this type of freeze protection has proven
to be adequate in relatively mild climates, it is extremely important that the sensors be properly placed and
that the homeowner realize that the system is unprotected in the event of a power failure. Recirculate freeze
protection is NOT recommended in climates where freezing temperatures are common or last for extended
periods.
Goldline strongly recommends the use of GC-3 freeze snap switches if freeze protection is being utilized.
Snap switches should be wired in series with the collector sensor. Placement of the snap switches at the
coldest point of the collector array and exposed plumbing will help assure that freeze protection starts early
enough to protect the system.
The GL-235 is shipped from the factory with recirculate freeze protection disabled (the jumper is present
but installed on one pin only). To activate recirculate freeze protection, install the jumper across both pins
marked “RECIRC”, located near the top right of the main circuit board.
If recirculate freeze protection is to be used on a GL-235, either:
•
The filter pump must be set for continuous operation or
•
The GL235 High Voltage Output must be wired for Timer Override function.
Nocturnal Cooling
The GL-235 has nocturnal cooling logic, which can be enabled/disabled via a jumper on the main circuit
board. During nighttime hours, when enabled, the GL-235 will circulate relatively warmer water from the
pool to the collector panels, thus cooling the pool over time. The GL-235 will circulate water when the
collector temperature AND the pool temperature is hotter than the high limit setting. Circulation will stop
when the collector temperature is 3ºF less than the pool temperature OR the pool temperature is cooler than
the high limit setting. The GL-235 is shipped from the factory with nocturnal cooling disabled (the jumper
is present but installed on one pin only). To activate nocturnal cooling, install the jumper provided onto the
two pins marked “COOLING” located near the top right of the main circuit board.
If nocturnal cooling is to be used, either:
•
The filter pump must be set for continuous operation or
•
The GL-235 High Voltage Output must be wired for Timer Override function.
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