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 Includes control unit, power cord, and sensors.     Please 
click below for other options: 
 Control 
 Unit
 Control 
 Unit with  power cord
 Control 
 Unit with sensors
 
 Goldline GL-30-LCO Solar Control Package with Power Cord and Sensors  - 110 
 Volts
 The Goldline GL-30-LCO 
differential temperature control is designed to provide maximum operating 
 efficiency and flexibility to effectively manage today's innovative solar 
energy  systems. It is a continuation of the advanced electronic technology 
which  produced the popular C-30 and CM-30 controllers - standards of the solar 
 industry since 1975, with hundreds of thousands of units installed worldwide.
 
 With an adjustable high limit of 50º-104ºF, the GL-30 is capable of 
 handling most differential temperature control functions for operation of 
 domestic water heating and sophisticated space heating and cooling. The GL-30 
is  designed to control recirculation, drain-back and closed loop 
 systems.
 
 
 Replacement unit for CM30 and C30:• Includes control unit, power cord, and sensors
 
 NOTE: TD-GL & DIX-30 Temperature Displays are discontinued
 
 
 LED Indicators
 Three highly visible LEDs 
 show:
 • Power to control
 • Power out from control
 • Power out from control due to a recirculation mode 
 to protect
 • the system from freeze 
 damage.
 
 GL-30 Output
 The GL-30 output is rated at 20 
 Amps and is designed to directly
 operate a pump or fan for heat collection 
 when the controller is sensing an appropriate temperature 
 differential.
 
 Differential
 The GL-30 has an 
 adjustable differential with a range of 8º to 24ºF. Solar systems with 
long  pipe runs normally require a higher
 turn-on differential temperature, 
and  open loop systems with short pipe runs usually require a lower turn-on 
 differential temperature for optimum performance. The GL-30 offers versatility 
 to tailor controls to numerous specific systems designs.
 
 Storage 
 High Limit
 The GL-30 allows you to set a high limit storage 
 temperature from 110º to 230ºF.
 
 Recirculation Freeze 
 Protection
 Recirculation freeze protection, when enabled, turns the 
 GL-30
 output on to circulate warmer storage water through the collectors 
 when near freezing temperatures are reached at the collector 
 sensor.
 
 System Test Switch
 The system test switch 
 manually switches the GL-30 to ON, AUTO,
 or OFF for complete control over 
 the system at all times.
 
 Product Application: Solar 
 Domestic Water Heating 
 System
 
 _______________________________________________________
 
 HELP » Contact Customer 
 Support
 • Toll-Free 
help  line offering product info and ordering support
 • Online e-mail technical and 
 installation support
 _______________________________________________________
 
 A 
 complete typical solar domestic water heating system components and layout 
 is shown below.
 
 
 
  
 
 
 Product Features:
 • 
 Differential temperature control
 •  
8-20ºF adjustable turn-on differential
 •  
4ºF fixed turn-off differential
 •  
110-230ºF adjustable high limit
 •  
120/240 VAC input
 • 20A, 2HP output
 
 Product Specifications:
 •  
Input power: 120 VAC or 240 VAC
 •  
Output: SPDT powered contacts 1HP@115VAC, 
 2HP@240VAC
 • rating @ 240VAC: 20A on NO contacts ; 10A on NC 
contacts
 •  Differential: 8/4 
to 24/4°F
 •  High Limit: 110° 
to 230° F
 •  Environment: 15° 
to 130° F; 0 to 95% rH
 •  Accuracy: 
+/- 1°F
 •  Dimensions: 
5.875" x 4.875" x 2.375"
 •  Temperature 
Sensors: Thermistor 10k @ 25°C/77°F not 
 included
 
 
 
  
 
 
 Inside 
 view
 of the
 circuit 
 board
 
 
 
 
 
 
 
 
 
 
 Product 
 Installation:
 View the following manual for installation and 
 troubleshooting
 
 Download »  Installation 
 Manual
 
 Download  
» Goldline 
 Warranty
 
 General 
 Control and Sensor Trouble-Shooting Tips:
 
 All of the GoldLine 
 (formally Independent Energy) controls (including C30, CM30, G30 and GL30 
 series) and some of the Heliotrope General (HG) DTT series controls 
incorporated  the use of 10k sensors.  Some of the earlier HG controls and 
some other  lesser known brands used 3k sensors.
 
 To determine the type of 
sensor, the  resistance must be measured in ohms (using a volt/ohm meter) when 
the sensor is  at 77 degrees F.  10k measures 10,000 ohms and 3k measures 
3,000 ohms. As  the temperature goes up, the resistance goes down.
 
 Resistance can  be checked at any temperature, and then
 convert the 
ohm reading measured to  the temperature equivalent
 by using the conversion 
 chart.
 
 Sensors can be purchased at
 Water Heaters Parts and 
 Supplies
 
 
 Product 
 Manufacturer: Goldline Controls Inc.
 
 Product Warranty:  
10 Year Limited Warranty
 Goldline Controls Inc. now offers a full 10 
 year limited
 warranty on all solar controls and accessories! This 
 warranty
 will cover repair or replacement of the control at no cost 
 for
 the first 24 months. For years 3 through 5, the repair/
 replacement 
 fee will be a maximum of 25% of the current list
 price, and for years 6 
 through 10, the repair/replacement fee
 will be a maximum of 50% of the 
 current list price. The best
 controls now have the best warranty. See the 
 Goldline
 warranty statement for 
 detail.
 
 _______________________________________________________
 
 
 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.
 
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