Bell & Gossett V1000001B PT Diaphragm Non-Code Expansion Tanks - Manual (Page 3)

WARNING: CHLORINE & AGGRESSIVE
WATER HAZARD The water quality can
signifi cantly infl uence the life of your
product. You should test for corrosive
elements, acidity, total solids, and other relevant
contaminants, including chlorine and treat your water
appropriately to insure satisfactory performance and
prevent premature failure. Failure to follow this
instruction may result in serious personal injury or
death and property damage.
SYSTEM VENTING AND PURGING
After initial venting and purging of air from the system,
more air will be released from the water as it is heated.
Therefore, it is recommended that a Bell & Gossett air
separator be installed on the main.
If the system has multiple loops or zones, the supply
water for all loops and zones must pass through the air
separator for complete and continuous air removal. In
case the piping arrangement does not permit the
installation of a single air separator on the main, air
separators should be installed on each loop or zone. In
this event, only one expansion tank is required for the
system.
Even with a Bell & Gossett air separator installed on the
main or mains, it is recommended that Bell & Gossett air
vents be installed on high points in the system.
It is also recommended that manual (key or coin type) air
vents be installed at higher points on the radiation.
OPERATING INSTRUCTIONS
1. The expansion tank is typically installed in the bottom
of an air separator. Its sealed-in air pre-charge prevents
water from entering the tank until the system pressure
exceeds the pre-charge pressure
2. As the water temperature rises, expanded water enters
the expansion tank’s water reservoir. The pre-charge air
chamber absorbs the pressure increase, keeping system
pressures below the relief valve setting.
3. As water temperature decreases the pressure in the
air chamber forces water back into the system until the
expansion tank is empty.
The selection, application, installation and servicing of
this product should be performed by a qualifi ed
professional within all applicable safety and code
requirements.
Air
Cushion
Air
Cushion
Air
Cushion
Air
Cushion
Air
Cushion
Air
Cushion
Models PT-5
and PT-12
Models PT-25V
and PT-475
WARNING: RUPTURE OR EXPLOSION
HAZARD Like most pressurized tanks, this
tank can over time corrode, weaken, and
burst or explode. Failure to follow this
instruction may result in serious personal injury or death
and property damage.
Back Flow Preventer Check Valve
PT Tank
Hot Water CWS
Relief Valve
Typical Instillation
Figure 1
Water
Heater