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CHAPTER 4
CHAPTER 4 - BOILER PIPING
4.3. Boiler Air Vent
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.
NOTICE
4.4. Low Water Cutoff Device
• The PRESTIGE Solo is equipped with a factory in-
stalled pressure sensor type Low Water Cut O
(LWCO).
• The minimum operating system pressure is 10 psig.
• Check local codes if a Low Water Cuto is required.
If so, determine if this device meets their require-
ments.
The PRESTIGE Solo control system also sens-
es the water temperatures entering and exit-
ing the heat exchanger to provide protection
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 Solo integral control
function as a means of providing low water
protection.
NOTICE
Fig. 6 - Piping Component Legend
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