Instructions / Assembly

INSTALLATION INSTRUCTIONS
The Webstone Air Separator should be installed at the point 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). It is recommended that an expansion tank be mounted before the pump suction as well.
The Air Separator must be installed in a straight run of horizontal piping and positioned precisely
upright. Designated lengths of straight piping before and after the unit are not required. Neither side
is designated as an inlet or outlet; the ow may be directed in either direction. Do not exceed a 50%
water/glycol ratio in the system.
SERVICE INSTRUCTIONS
Regular maintenance of the unit is not required. However, over time debris may collect in the unit
and impact performance. Should this occur, use the following instructions to clean the unit.
CAUTION! System fluid under pressure can be very hazardous. Before removing the vent head for
inspection, reduce system pressure to zero, or isolate the Air Separator from the system. Water
temperatures above 100°F can also be very hazardous. Allow the system to cool to below 100°F
before proceeding. Keep body away from valve while open. Failure to follow these instructions may
cause serious bodily injury or property damage.
1. Using two strap wrenches, hold the upper body in place and remove the vent body cap ring, taking
care not to damage the o-ring. Lift up on the vent stem to remove the vent head assembly.
2. Use a mild detergent or water/vinegar solution to clean the vent head assembly.
If there is excessive build up, soak the vent head assembly in mineral
spirits for several hours and then clean thoroughly.
3. If cleaning the coalescing material is also required:
While the vent head assembly is removed, remove the upper body by using two strap wrenches
on the lower and upper bodies of the air vent. Take care not to damage the o-ring.
4. Remove the coalescing medium from the lower vent body.
CAUTION! Coalescing Medium is very sharp
5. Rinse thoroughly with mild detergent or water/vinegar solution
to remove any build up that may have occurred.
6. Examine the o-ring before installing on the air separator to ensure no damage has occurred.
7. Reassemble the air separator.
8. Return system to operating condition.
9. If system was completely drained, minimal manual bleeding may be required
to ensure the system is completely full of water and able to circulate.
FORM#ASI0417
AIR SEPARATOR
w/ Removable Vent Head & Coalescing Medium
INSTALLATION &
SERVICING INSTRUCTIONS
ONE APPIAN WAY WORCESTER, MA 01610
P.O. BOX 59 WORCESTER, MA 01613
P: [phone] • F: [phone]
www.webstonevalves.com
©2017 NIBCO INC.,
All Rights Reserved.