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Solar Pool Heating Control
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Automatically Maximizes Solar System
Heat Collection
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Precise Calibrated Temperature Setting Dial
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Single Model Handles all Systems-Old or New
Pools, Spas, 12 or 24VAC Actuators.
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Automatic Switch Over from Solar Heating to
Nocturnal Cooling if Desired
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Standard 120/240 VAC 50/60 Hz. Input
& 12 and 24 VAC Output
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Goldline’s Proven Reliability and Performance
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Industry’s Only 5-year Limited Warranty*
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Goldline Combo (GLC)
is GL-235 LV or GL-235 LV-HV
Control, Diverter Valve, Actuator & Sensors
Unique 5 Year Warranty*
*Refer to Limited Warranty Statement for Details.
Corporate Office:
42 Ladd Street
East Greenwich, RI 02818
(401) 884-6990
(401) 885-1500 Fax
Western Regional Office:
7171 Alvarado Road, Suite 104
La Mesa, CA 91942
(619) 462-4298
(619) 462-4498 Fax
Description
The GL-235 is designed to meet the need for easy installation,
dependable operation, and serviceability. The GL-235 incorpo-
rates unique, microprocesser based construction to ensure relia-
bility and accurate performance. The GL-235 offers advanced
operating features to provide differential temperature control,
selectable high limit, programmable recirculation freeze protec-
tion, nocturnal cooling and optional booster pump control.
AUTOMATIC HEATING: If the collectors are warmer than the
pool water by 4
N
or more, and the pool is below the selected
desired temperature, the valve will rotate allowing heat collection.
This heat collection will stop when the solar sensor falls to within
1.5
N
F of the pool temperature or the pool temperature exeeds the
“desired temperature” set on dial.
AUTOMATIC COOLING: (Field selectable option) If the col-
lectors are cooler than the pool water by 6
N
F or more, and the
pool is above the selected desired temperature, the valve will
rotate allowing cooling via the solar collectors. The heat dissipa-
tion will stop when the collectors rise within 3
N
F of the pool tem-
perature or the pool temperature is lowered below the set desired
temperature.
SINGLE SETTING FOR DESIRED TEMPERATURE: The
GL-235 logic is set by a single dial adjustment with the desired
pool/spa temperatures clearly indicated. The dial is calibrated
with the temperatures from 70
N
F to a high of 104
N
F for quick and
easy, user-friendly operation. The temperature set indicates set
pool/spa temperature, and the GL-235 will automatically dete
r-
mine if the water should be solar heated or cooled, thus maxi-
mizing the system capabilities.
TERMINAL STRIP CONNECTIONS: For input power, and
sensor inputs. Controls also have industry standard 3 pin connec-
tors for both forward and reverse valve actuator operation and
screw terminal connectors.
LED INDICATORS: Show the status of the system operation,
Four highly visible LED’s show 1) power to the control, 2) power
output directing valves and/or pump to collect heat (heating), 3)
power output directing valves and/or pump to dissipate heat
(cooling), 4) sensor fault indicator shows sensor(s) not operating
properly.
GL-235 VALVE OUPUT: Rating is the industry standard 24
VAC. A jumper switches the output to 12VAC for compatibility
with older valve actuators. Output is fuse protected.
RECIRCULATION FREEZE PROTECTION: (field selectable
operation) turns the GL-235 output ON, directing warmer
pool/spa water through the collectors when near freezing tempera-
tures are reached at the collector sensor. The GL-235 will allow
recirculation when the collector temperature rises to 42
N
F. Two
10K Ohm sensors are required for operation. One or more freeze
snap switches are recommended if freeze recirculation protection
is utilized. Important--see installation instructions before using
Recirculation Freeze.
SYSTEM TEST SWITCH: Allows the user to manually over-
ride the automatic function of the GL-235 and verify operation.
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