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. Antifreeze if needed, must be of a type specifically designed for use in closed hydronic heating
systems and with alluminum.
a. Choice and use of antifreeze must be in accordance with local plumbing codes.
b. Do not use automotive antifreeze as the type of corrosion inhibitors used will coat the
boiler's heat transfer surfaces and greatly reduce capacity and efficiency.
c. Consult antifreeze manufacturer's literature for compatibility of antifreeze with
aluminum boiler. Some brands have corrosion inhibitors that break down more rapidly or
become ineffective at higher operating temperatures when used with aluminum. Follow the
antifreeze manufacturers instructions on determining the proper ratio of antifreeze to water
for the expected low temperature conditions, and for maintaining the quality of the
antifreeze solution from year to year.
d. Use of antifreeze in any boiler will reduce capacity by as much as 10 to 20%, due to
differing heat transfer and pumping characteristics. This must be taken into consideration
when sizing the heating system, pump(s), and expansion tank. Consult antifreeze
manufacturer's literature for specific information on reduced capacity.
e. Water content of the boiler is 2.6 gallons. (10 liters)
B. FILLING BOILER WITH WATER AND PURGING AIR FOR SYSTEMS WITH
DIAPHRAGM TYPE EXPANSION TANKS
Refer to appropriate "Near Boiler Piping" diagrams.
1. Close all zone service valves on the supply and return piping. Open the feed valve and fill
boiler with water. Make sure air vent is open. Hold relief valve open until water runs air free
for five seconds to rapidly bleed air from boiler, then let the relief valve snap shut.
2. Open the zone service valve on the suoDlv pipe for the first zone. Open the purge valve on the
first zone. Feed water will fill the zone, pushing air out the purge valve. Close the purge valve
when the water runs air free. Close the zone service valve.
3. Repeat step 2 for all remaining zones.
4. Open all service valves. Any air remaining trapped in the return lines between the service
valves and the boiler will be pushed towards the air vent when the boiler is placed in operation.
5. Inspect piping system. Repair any leaks immediately.
C. FILLING BOILER WITH WATER AND PURGING AIR FOR SYSTEMS WITH
CONVENTIONAL CLOSED TYPE EXPANSION TANKS
Refer to appropriate "NEAR BOILER PIPING" diagrams.
1. Close all zone service valves on the supply and retum piping and close the expansion tank
service valve. Drain expansion tank. Open the feed valve and fill boiler with water. Hold relief
valve open until water runs air free for five seconds to rapidly bleed air from boiler, then let the
relief valve snap shut.
2. Open the zone service valve on the suEply_l pipe for the first zone. Open the purge valve on the
first zone. Feed water will fill the zone, pushing air out the purge valve. Close the purge valve
when the water runs air free. Close the zone service valve.
3. Repeat step 2 for all remaining zones.
4. Open the expansion tank service valve and the tank vent. Fill the tank to the proper level and
close the tank vent. Remove the handle from the expansion tank service valve so the
homeowner doesn't accidentally close it.
5. Open all service valves. Any air remaining trapped in the return lines between the service
valves and the boiler will be pushed towards the expansion tank when the boiler is placed in
operation.
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