15
Boiler Piping
Boiler Return Connection
Boiler Drain Valve
(field supplied)
Boiler Supply
Connection
Pressure Relief Valve
(Supplied with Boiler)
3/4" Street Elbow
Air Vent
Drain Piping Directed
to a Suitable
Place of Drainage
Fig. 5: Pressure Relief Valve and Boiler Drain Valve Installation
Boiler Air Vent
This boiler is supplied with a special
automatic air vent that will provide reli-
able operation in purging air from the
boiler. The hygroscopic cap supplied
with the automatic air vent MUST
remain tight at all times on the air vent
body. The hygroscopic cap has a mem-
brane which expands upon contact with
water and seals the air vent until the
membrane dries up due to new air
forming in the air vent.
1. Make sure to fully tighten the cap on the air
vent on initial installation.
2. Never loosen the hygroscopic cap to allow
air to escape the air vent. Air will exit with
the cap fully tightened in place.
3. If the hygroscopic cap is not fully tight-
ened, water may leak from the cap. Simply
tighten the cap securely.
NOTICE