Circulator
Circulator w/Isolation Flgs
Air Separator
Auto Air Vent
24 vac Motorized Zone Valve
Backflow Preventer
Pressure Differential Bypass Valve
Diaphragm Style Expansion Tank
Heat Emitters (Baseboard, Radiant Manifolds, Radiant Panels)
Pressure Relief Valve
Union
Spring Check Valve
Ball Valve Style Boiler Drain
Full Port Ball Valve
Pressure Reducing Valve
Valve & Drain Assembly
Closed style
Expansion Tank
16
CHAPTER 4
CHAPTER 4 - BOILER PIPING
4.3. Boiler Air Vent
This boiler is supplied with a special automatic 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
securely.
NOTICE
4.4. Low Water Cutoff Device
• The EXALT is equipped with a factory installed
pressure sensor type Low Water Cut O (LWCO).
• The minimum operating system pressure is 7 psi.
In the event that the pressure falls below 7 psi the
burner will deactivate until proper pressure has
been restored.
• Check local codes if a Low Water Cuto is
required. If so, determine if this device meets their
requirements.
The EXALT control system also senses the water
temperatures entering and exiting 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 EXALT integral control
function as a means of providing low water protection.
NOTICE
Fig. 7 - Piping Component Legend
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