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Hayward (Previously Goldline)  AquaSolar Solar Pool Control Unit - Controller Only. Model GL-235

Top-of-the-line design, construction, and performance are the hallmark of the Hayward  GL Series, Hayward's premier line of swimming  pool/spa solar heating system controls - a series where all the optimum  features available today come as standard on the Hayward  GL Series!

The Energy SuperMarket’s top selling brand, the  Hayward units earn a solid 5 star plus rating in our Consumer Value guide!

Hayward units are backed by the only 5-year factory warranty in the industry. Plus The Energy SuperMarket offers the lowest on-line factory direct pricing available! Guaranteed. 

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    GL-235 Hayward Microprocessor Solar Pool Controller

The Hayward Microprocessor Solar Pool Control Series is designed to meet
the need for easy installation, dependable operation, and serviceability...  for the definitive choice in swimming and spa comfort!!! 

» The GL-235 LV/HV offers advanced operating features to provide differential temperature control, selectable high limit, programmable recirculation freeze protection, nocturnal cooling, and optional booster pump control.

Plus the GL-235 incorporates unique, microprocessor based construction to ensure reliability and accurate performance.


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GL-235 Pool/Spa Heating Control Feature Highlights: 
  
     • Maximizes solar system performance by dramatically 
     • increasing system efficiency!!!
     • Microprocessor based ensures total digital accuracy 
     • Selectable high limit control 
     • Automatically switches from heating to nocturnal cooling 
     • Re-circulation freeze protection [field selectable] 
     • Nocturnal cooling [field selectable] 
     • 75°F to 104°F precision calibrated temperature control 
     • dial with "solar off" position 


The GL-235 automatically maximizes the heat collection of any solar pool heating system, being totally compatible with all new or existing systems, new or existing pool/spa applications, and new or existing 12VAC or 24VAC actuator valves.

The pool/spa temperature level is set by a single dial adjustment with the desired temperature using a clearly indicated dial. This dial is highly calibrated for quick and easy, user-friendly operation.

Plus, the GL-235 will automatically determine if the water should be solar heated or cooled, thus maximizing your swimming comfort. 

The GL-235 LV/HV unit utilizes the existing pool's circulation pump for solar heat pick-up. It works in conjunction with the Hayward /Jandy 3-Way 12VAC Valve and Actuator model JVA-PKG, or with other manufacturer's 12VAC valves.

This unit can operate either 12 or 24 volt valves. In addition, the GL-235 LV/HV will also operate a separate pump that is dedicated to solar circulation only. The GL-235 LV/HV model has one low-voltage output for controlling a single valve and a second high voltage output for controlling a filter pump or solar booster pump.

The pump can be sized up to 1HP with 120VAC and 2HP with 240VAC.

Specific Applications: Designed for both residential and medium-duty commercial pools in the small to mid-size pool heating range when the GL-235 LV/HV controller needs a Hayward/Jandy Valve, plus operate a separate pump that is dedicated to solar circulation only. 

Note: The unit has a front panel switch which provides for nocturnal pool cooling instead of heating. Cooling is used in conjunction with the pool's filtration pump being allowed to run during the early dawn, cooler hours.

Installation Note: The GL-235 is designed for outdoor use. For safety, the GL-235 must be a minimum of 5 feet horizontally from pool or spa.

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The Hayward GL-235 Operational Details: 

• Automatic Heating
If the water within the collectors is warmer than the pool water
by 4 degrees or more, and the pool is below the selected desired
temperature, the valve will rotate allowing heat collection.

The heat collection will stop when the solar sensor output falls to
within 1.5 degrees of the pool temperature or the pool temperature
exceeds the "desired temperature" set on dial.

• Automatic Nocturnal Cooling  [Field selectable option]
Swimming pools often become too warm from the sun on their own
during the height of the summer season.

The GL-235 comes standard with nocturnal cooling logic, which can
be enabled/disabled via the main circuit board. During nighttime hours,
when enabled, the GL-235 will circulate warmer water from the pool
to collector panels, thus cooling the pool over time.

If the water within the collectors is cooler than the pool water
by 6 degrees or more, and the pool is above the selected desired
temperature, the valve will rotate allowing cooling via the collectors.

The heat dissipation will stop when the collectors sensor output rises
within 3 degrees of the pool temperature, or the pool temperature
is lowered below the set desired temperature.

• Setting 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 degrees to a high of 104 degrees for
quick and easy, user-friendly operation.

The temperature set indicates set pool/spa temperature, and the
GL-235 will automatically determine if the water should be solar heated
or cooled, thus maximizing the system capabilities.

• Terminal Connections
For input power, and sensor inputs; controls also have industry
standard 3 pin connectors 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  
  3. Power output directing valves and/or pump to dissipate heat
  4. Sensor fault indicator shows sensor(s) not operating properly

• GL-235 Valve Electrical Output
Rating is the industry standard 24VAC. A jumper switches the output to 12VAC for compatibility with older valve actuators. Output is fuse protected.

• Freeze Protection  [Field selectable operation]
Turns the GL-235 recirculation output ON, directing warmer pool/spa water through the collectors when near freezing temperatures are reached at the collector sensor.

The GL-235 will allow recirculation when the collector temperature rises to 42 degrees. Two K Ohm sensors are required for operation.

One or more freeze snap switches are recommended if freeze recirculation protection is utilized.

Note: see installation instructions before using Recirculation Freeze

• System Test Switch
Allows the user to manually override the automatic function of the GL-235 and verify operation.

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Installation Technical/Operational Details:

• The GL-235-LV/HV controls a single valve. In most applications this is the solar valve, which diverts water through the solar collector panels or through the normal pool loop depending on conditions.

• Units are shipped with the output voltage set to the industry standard 24VAC.

• For older systems with 12VAC valves, an internal jumper can be moved to select 12 VAX output operation.

• The GL-235 provides two different types of connections to the pool/spa actuators. When used with newer actuators manufacture red by Hayward, Compool, and Jandy that come standard with wire end connectors, two 3-pin connectors are supplied. For older actuators with no wire end connector, a 3 position terminal block  is supplied.
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     HELP » Contact Customer Support 
     • Toll-Free help line offering unit selection and sizing support
     • Online e-mail technical and installation support

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Function: Controls solar pool heating systems - plus extends season
Benefits: Maximizes your swimming pleasure! 


Product Applications:
• Efficiently manages solar pool heating systems to operate at
• peak efficiency - even under less than ideal weather conditions
• Designed to provide hassle-free management of both residential
• and light-duty commercial pools
• Excellent for high demand pools/spas at residential, condo, resort,
• hotel, motel, health club, vacation home, etc.
• Supplementing a solar pool heating system combined with
• a Hayward GL-235 Solar Pool Controller - together with a solar
• pool cover greatly enhances total performance, plus reduces energy
• costs up to 70 percent - thereby saving hundreds of dollars
• per year in pool heating costs!


Product Benefits:
• Superior electronic control of pool/spa heating operation
• Reduces process to simple knob setting operation
• Highest unit life expectancy; years of trouble-free service


Product Features:
• 75°F [24C] to 104°F [43C] precision calibrated temperature control 
• 120 / 240VAC input with 12 / 24VAC low voltage output 
• 1HP@120VAC / 2HP@240VAC high voltage output with dry 
• contact SPDT output for booster pump or time clock override
• Sensor fault detection with LED indicator 

• Do-it-yourself friendly kit; average one to three hour installation
• Easy to read installation manual; step-by-step diagrams
• Installations feasible by handy-person with standard hand tools
• Includes all necessary components needed for complete install
• Brass material sensor for pool water temperature
• Aluminum block sensor for collector simulation that does not
• need to be mounted on the collectors]
• GL-235 LV/HV  upgraded model available for pump control
• and/or valve plus pump

• Proper kit selection supported by customer service agent
• Installation supported by solar engineer tech assistance
• Toll-Free help line and/or online e-mail tech support


GL-235 Hayward Series Technical Specifications:
• Power:
• 105-130VAC, .5A 50/60Hz. or 195-250VAC, .3A 50/60Hz
• Output:
• Selectable low voltage 24VAC, 20VA, .85A or 12VAC, 20VA, 1.7A
• GL-235-LV/HV only:
• SPST-NO isolated contact, 115VAC 1HP, 240VAC 2HP
• Sensors:
• 2 required [thermistor, 10Kohm @ 25C/77ºF]
• Differential:
• On at 4°F, off at 1.5°F
• Recirculate freeze:
• On at <40°F, off at > 42°F


Product Warranty:
• 5-Year Limited Factory Warranty 
Hayward Controllers carry a 5 year warranty

Download »

Hayward GL-235 Brochure

Hayward GL-235 Installation Manual

Hayward Warranty

Product Manufacturer: Hayward Industries, Inc.

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Our Star Rating system is the direct result of experience with well over 4000 actual units in the field in the homes of our customers.

The criteria are:

• Quality of Materials and Workmanship
• Reliability and frequency of repairs
• Factory response to service or warranty issues
• Strength of the warranty
• Customer satisfaction
• Efficiency (verifiable rating certification by industry accepted test
• facility)
• Longevity

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     HELP » Contact Customer Support 
     • Toll-Free help line offering unit selection assistance
     • Online e-mail technical and installation support

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Note: All product performance tests and claims are that of the
manufacturer, not The Energy Supermarket.

Processing and Delivery Information: Please allow Processing Time as stated above for your order, plus standard transportation delivery time. Orders placed after 2PM EST may not begin processing until the next business day. Please call for Rush Processing and/or Rush Shipping options.