Specifications:

• Maximum Glycol/Water Pressure: 16 psi Controlled by Radiator Cap
• Maximum Glycol/Water Temperature: 247-1/2F
• Maximum Glycol/Water Volume: 9 Cubic Inches in Radiator
• Maximum Vacuum: -2 psi Controlled by Radiator Cap
• Number of Radiator Fins: 50
• Fin Area: 250 in2 or 1.74 Ft2
• Copper Tube: 3/4 inch ID, 7/8 inch OD
• Inlet connection: 3/8 Copper tubing
• Overflow Reservoir Volume Full: 0.11 Cubic Feet or 0.87 Gallons
• Overflow Reservoir Volume Normal: 0.06 Cubic Feet or 0.50 Gallons
• Overflow Float Level Switch: N/ C, Opens on Low Fluid Level
• Overflow from Radiator: Bottom of Reservoir
• Overall Dimensions: 46-1/2 L x 4-1/2 W x 7-1/2 H
• Weight: 4.5 Pounds

This data is representative of the product, acceptability for your solar collector or collector system should be verified by the user. Acceptability for your application is the responsibility of you the user.

The Observed heat dissipation of the Self-Pressurizing Unit has been evaluated in San Diego. The unit is not in the flow path, so it stays cold during normal operation. Once the collector is stagnated, the steam moves by buoyancy to the top of the collector and into the radiator where it is condensed. The numbers in Table 1 are based on several years of observation. Stagnation usually occurs in the summer when the air temperature is higher and near equinox, when the collectors are normal to the sun and collect the most energy.

Table 1. BUTLER SUN SOLUTION
SELF-PRESSURIZING UNIT
HEAT DISSIPATION CAPABILITY
Measured in San Diego, CA (1/15/2009)
Heat From Non-Flowing Water Heat Of Vaporization: 965 Btu/Lb

Table 2. San Diego Solar collector Heat Dissipation Needed on Stagnation

Caution: Using this heat dump on more collector area than the maximum stated in Table 2 above will void the warranty and will cause boiling over. Boiling over will loose fluid from the system and cause the overflow reservoir to run dry. If this happens air will be drawn into the closed loop which will degrade the glycol turning it to glycolic acid, which will corrode your solar collectors. We will not be liable for damages caused by improper use of our product.

Product              length(in)  connection(I.D.)  radiator length(in)  radiator area(square in)  reservoir volume(g)   heat loss(Btu/hr)

SunMaxx-HDBB1       40          3/8                    17                          232                               1.2                      8,782

Sunmaxx-HDBB2       47          3/8                    24                          344                              1.2                     12,400    

SunMaxx-HDMega     84           1/2                   112.5                      1800                              5                      56,000

Need Assistance?
If you have questions, need help, or simply feel uncomfortable placing your order online, feel free to contact the product representative at 1-800-786-0329 or send a Support Ticket.