PT Diaphragm Non-Code
Expansion Tanks
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Safety Instruction
This safety alert symbol will be used in this manual to draw
attention to safety related instructions. When used, the safety
alert symbol means ATTENTION! BECOME ALERT! YOUR SAFETY
IS INVOLVED! FAILURE TO FOLLOW THESE INSTRUCTIONS MAY
RESULT IN A SAFETY HAZARD.
WARNING:
This product can expose you to chemicals
including Lead, which is known to the State of
California to cause cancer and birth defects or
other reproductive harm. For more information go
to: www.P65Warnings.ca.gov.
WARNING: Explosion or Rupture Hazard
A relief valve must be installed to prevent
pressure in excess of local code requirement or
maximum working pressure designated in the
Product Manual, whichever is less. Do not expose
Product to freezing temperatures or temperatures
in excess of 240°F. Do not adjust the pre-charge or
re-charge this Product except for any adjustments
at the time of the initial installation, especially if
Product is corroded, damaged or with diminished
integrity. Adjustments to pre-charge must be done
at ambient temperature only. Failure to properly
size the Product or follow these instructions may
result in excessive strain on the system and may
lead to Product failure, serious or fatal personal
injury, leakage, and/or property damage.
WARNING:
Read carefully the product installation, operating
and maintenance instructions. Failure to follow
the instructions and warnings in the manual may
result in serious or fatal injury and/or property
damage, and will void the product warranty.
This product must be installed by a qualified
professional. Follow all applicable local and state
codes and regulations, in the absence of such
codes, follow the current editions of the National
Plumbing Code and National Electric Code, as
applicable.
Description
Many local codes require back flow preventers. Since this seals
off the system, an expansion tank is required or the relief valve
will discharge on every heating cycle. The thermal expansion
tanks eliminate this wasteful, costly, and dangerous practice.
The thermal expansion tank is designed to be used with water
temperatures to 140°F (60°C). Do not use a standard tank. The
sizing chart will allow you to choose the correct size expansion
tank for your application. When water is heated, it expands.
Provision must be made for this expansion in a closed hot
water heating system. The Bell & Gossett Series PT pre-charged
diaphragm tank stores the expanded hot water and returns air-
free water to the system when the temperature drops.
Operational limits
Maximum limitations
Model number
Pressure
PT-5, PT-12,
140 STET (1035
PT-25V
kPa)
PT-30V, PT-42V,
100 PSIG (689
PT-60V, PT-80V,
kPa)
PT-180V, PT-210V
INSTRUCTION MANUAL
V1000001_Rev C
EN, ES, FR
Factory pre-
charge
Temperature
140°F (60°C) 38 PSIG (262 kPa)
1
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