Boiler Air Vent; Low Water Cutoff Device; Fig. 6 - Piping Component Legend - TriangleTube PRESTIGE Excellence 110 Installation & Maintenance Manual

CHAPTER 4 - BOILER PIPING
4.3.

Boiler Air Vent

NOTICE
This boiler is supplied with a special automat-
ic air vent that will provide reliable 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 membrane 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
during 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 tightened, water
may leak from the cap. Simply tighten the cap se-
curely.
14
4.4.

Low Water Cutoff Device

• The PRESTIGE Excellence is equipped with a facto-
ry installed pressure sensor type Low Water Cut Off
(LWCO).
• The minimum operating system pressure is 10 psig.
• Check local codes if a Low Water Cutoff is required.
If so, determine if this device meets their require-
ments.
The PRESTIGE Excellence control system also
senses the water temperatures entering and
exiting the heat exchanger to provide protec-
tion against low water conditions. Where local
codes and jurisdiction do not accept a pressure
device for low water protection, the jurisdiction
may accept this PRESTIGE Excellence integral
control function as a means of providing low

Fig. 6 - Piping Component Legend

NOTICE
water protection.