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BURNER SETUP & BOILER OPERATION
4. See Section 1 - Preinstallation for boiler water
treatment requirements.
5. If the system requires antifreeze protection, use only
propylene glycol specially formulated for hydronic
systems. These contain inhibitors that prevent
corrosion of the boiler and system components. Do
not use ethylene glycol or automotive antifreezes.
a. Make sure that the antifreeze supplier
can provide periodic testing of antifreeze
concentration and inhibitor level.
b. If an automatic fill valve is used, the solution
strength in the system must be checked to assure
that the antifreeze concentration has not been
overly diluted.
c. Local codes may require the addition of a
backflow preventer or manual fill only with
separation from the city water supply.
d. Consider the minimum temperature of potential
exposure in the system when deciding on the
antifreeze concentration. A concentration of
50% generally provides protection from freezing
to -30°F.
E. PURGE AIR FROM THE SYSTEM
1. Purge the system using purge valves, isolating zones
in the process or use system vents. Do not operate
the pump(s) while purging. Pumps will hold air in the
eye of the impeller.
2. Allow the system to reach 180°F and use manual
vents, if installed, to remove any remaining air.
Watch the pressure gauge as the system approaches
180°F. If the pressure exceeds the design operating
pressure, check:
a. Fill valve pressure.
b. Expansion or compression tank operation and
sizing.
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