Install Instructions

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SPIROVENT® INSTALLATION and OPERATION INSTRUCTIONS
Junior Series Air Eliminator
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INSTALLATION INSTRUCTIONS
The Spirovent Junior Air Eliminator should be installed at the point of lowest solubility in the
system: that being where the temperature is the highest (i.e. after the boiler and/or heat
exchanger) and the pressure is the lowest (i.e. before the pump suction), as pictured in Figure 1
below. As with all hydronic system piping it is recommended to have the expansion tank
connection to the system on the suction side of the pump or circulator.
Figure 1 Heating System
Standard Juniors must be mounted in a straight run of horizontal piping in a perfectly upright
position to allow the vent to operate freely. Vertical models are available for installation in vertical
piping. “X” pipe diameters of straight run before and after the unit are not required.
The flow may be directed to either side of the unit. There is NO directional arrow. Either
connection may be used for inlet or outlet.
The threaded connection at the air vent outlet has been provided as a convenience for those
wanting to pressure test the system with air prior to filling. To test, install a ½” pipe cap before
filling and remove the cap once testing is complete. During operation, this threaded
connection should be free of any piping connection with the unit in service to allow the