Installation
Water Heater
For units containing the desuperheat- er option, the desuperheater pump fuse is located within a container in- side of the control box. The fuse is not factory installed.
Note: If the fuse is installed, and the unit is started without water in the sys- tem, pump damage may occur.
Using Antifreeze
In areas of the country where entering water temperatures drop below 45°F or where piping is being run through areas subject to freezing, the loop must be freeze protected by using an approved antifreeze solution to pre- vent the earth loop water from freez- ing inside the heat exchanger. Methanol and glycols are the most commonly used antifreeze solutions. Consult your geothermal unit supplier for locally approved solutions in your area.
Propylene glycol is not recommended in installations where the water tem- perature are expected to fall below 30°F. At extreme temperatures, the viscosity increases to the point where normal loop circulating pumps may not maintain proper flow.
If propylene glycol is the only locally approved solution for
Calculate the approximate volume of water in the system by using the re- quirements detailed in Table 2. Add three gallons to this total to allow for the water contained in the hose kit and geothermal unit.
Figure 8: Water heater kit
Table 2: Antifreeze requirements based on volume |
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| Type of Antifreeze |
| Minimum Temperature for Freeze Protection | ||||||||
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| 10°F |
| 15°F |
| 20°F |
| 25°F |
| 30°F | |
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| Methanol |
| 25% |
| 21% |
| 16% |
| 10% |
| 3% |
| Propylene Glycol |
| - |
| - |
| - |
| - |
| 6% |
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14 |
