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4.8.3 Boiler Mixing Valve Set Up
A thermostatic mixing valve is highly recommended as one means of assuring that
the water returning to the boiler is consistently above the minimum required temperature of
140°F. This valve, along with circulation control based on a minimum circulating water
temperature will protect the boiler from cold water. EnergyLogic offers boiler mixing valve kits.
The recommended installation for the valve is per the following diagram:
Boiler Mixing Valve Arrangement.
4.9 Filling the System
1. When the boiler system piping is complete, add heating-grade antifreeze into the vessel
through the gauge port on the top prior to filling the system with water. A 25% to 50%
solution is typical; however, the climate of use will dictate the freezing protection
required. It is recommended that the percent solution used be based on the minimum
necessary for freeze protection. The antifreeze must be propylene-based, hydronic
grade for heating systems, rated for high temperature operation. RV grade solution will
not hold up, and should never be used.
2. For reference, following are the vessel capacities for the various models.
a. EL-200B
30 gallons
b. EL-375B
43 gallons
c. EL-500B
52 gallons
Additional capacity for the piping system must be estimated specific to the application.
3. Inspect all connections for leaks.
