12 -GENERAL INSTRUCTIONS
FILLING SYSTEM WITH WATER
•Close air vents on all radiation units. Open valves to these units.
•Verify boiler and expansion tank drain valves are closed.
•Air bleed screw on tank drain fitting should be closed.
•Open valve in line from boiler to expansion tank. Open water inlet to your boiler and leave it open. Start with lowest radiation unit. Open air vent on this unit. When all air has escaped and water starts to flow from vent, close it.
•Go to next radiation unit, and repeat this process. Repeat until you have covered every radiation units in the system (ending up at highest unit in system).
•If your units have automatic vents, manual venting is unnecessary but it will speed up the proper filling of your system.
•If your system is closed expansion tank system, you may leave it open to refill system automatically as needed.
•Check temperature pressure gauge. Not position of hand indicating pressure. This should be between 10 and 15 psi. Any lowering of this movable hand below 10 psi. Will indicate loss of water due to leakage. Automatic fill valve should compensate for this. Instructions are packaged with the valve.
NOTICE
Never run water in a hot empty boiler.
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