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28 UNT-IOM-6
The hydronic coil contains a vent, either manual or automatic, to
release air from the unit. This vent is not sufficient for venting the
water piping system in the building.
Locate the coil air vent on the piping side, above the coil connections
on the unit. Perform the following steps to vent the coil after installing
the unit. See Figure 16.
1. Pressurize the building piping system with water and vent any
trapped air at system vents.
2. For units with manual air vents, back the set screw out to expel air
from the unit and then re-tighten the set screw.
The automatic air vent should require no adjustment for the coil to
vent. However, if the coil does not vent immediately, unscrew the outer
portion of the fitting to expel air from the port.
If debris has become trapped in the vent, completely remove the outer
portion of the fitting and clean.
Venting the Hydronic
Coil
Figure 16. The hydronic coil air vent is above the coil
connections. A horizontal unit is on the left and a vertical on
the right.