Knowing the following data:
- The total system volume (gal)
- The maximum working temperature of the system (°F)
- The possible percentage of antifreeze glycol in the system
- The pre-charge pressure (psi) (equal to the minimum operating pressure)
- The set pressure for the safety valve (psi)
- The difference in level (ft)
it’s possible to calculate the required volume of the expansion tank.
- The calculation is valid in the hypothesis that the initial pressure (hydrostatic pressure) on the expansion tank is not higher than the pre-charge pressure.
- The difference in height (ft) is the difference between the position in which the safety valve is installed and the position of the tank. Enter a positive difference if the valve is located higher than the tank, negative otherwise (default is 0).
- The minimum operating temperature is set by default at 40°F.
- The set pressure for the safety valve, summed to that one due to the possible difference in height, must be lower than the maximum working pressure of the tank.
- The calculation provides only an indication of the required volume of the tank and must be checked by a qualified and authorized technician.