Bell & Gossett V1000001B User Manual

PT Diaphragm Non-Code
Expansion Tanks

INSTALLER: PLEASE LEAVE THIS MANUAL FOR THE OWNER’S USE.

INSTRUCTION MANUAL

V1000001B

WARNING: California proposition 65
warning! This product contains chemicals
known to the state of California to cause
cancer and birth defects or other reproduc­tive harm.

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 THE
INSTRUCTIONS MAY RESULT IN A SAFETY HAZARD.

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 140°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 instruc-

tions 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 qualifi ed 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 fl ow 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

MODEL NUMBER

MAXIMUM LIMITATIONS

PRESSURE

TEMPERATURE

FACTORY

PRE-CHARGE

PT-5, PT-12, PT-25V

PT-30V, PT-42V, PT-60V,
PT-80V, PT-180V, PT-210V

140 STET
(1035 kPa)

100 PSIG
(689 kPa)

140°F (60°C)

38 PSIG
(262 kPa)

WARNING: This product, like most products
under pressure, may over time corrode,
weaken and burst or explode, causing
serious or fatal personal injury, leaking or

fl ooding and/or property damage. To minimize risk, a
licensed professional must install and periodically
inspect and service the Product. A drip pan connected
to an adequate drain must be installed if leaking or
fl ooding could cause property damage. Do not locate in
an area where leaking could cause property damage.

INSTALLATION INSTRUCTIONS

A. PRE-INSTALLATION

WARNING: System fl uid under pressure and/

or at high temperatures can be very
hazardous. Before servicing, reduce system

pressure to zero or isolate the vessel from
the system. Allow system to cool below 100°F and
above 35°F. Failure to follow this instruction may result
in serious personal injury and/or property damage.

B. INSTALLATION

Install Bell & Gossett Series PT pre-charged diaphragm
expansion tanks on the cold water supply (CWS) line at a
point between the water heater and back fl ow preventer,
check valve or pressure reducing valve.

1. Visually inspect expansion tank and check for damage
prior to installation.

WARNING: If the expansion tank is
damaged, it must be replaced. Failure to
follow this instruction may result in serious
personal injury or death and property
damage.

2. Bell & Gossett Series PT diaphragm tanks are factory
pre-charged to 38 PSI (262 kPa). Adjust pre-charge to
equal system fi ll pressure.

WARNING: Excessive pressure can cause
tank to explode. Exercise care when fi lling
a tank with air so the pressure does not ex-

ceed that required of does not exceed the
working pressure of the tank as stamped on the name­plate. Failure to follow these instructions will result in
serious personal injury or death and property damage.

3. Replace and tighten cap on air fi tting.

4. The location selected should be indoors in an area not
subject to freezing.

5. The items which must be installed in sequence in the
cold water line are:
a. The EXPANSION TANK must be installed at least 18
inches (46 cm) away from the cold water inlet fi tting on
the water heater
b. The PRESSURE GAUGE, and
c. The PRESSURE REDUCING VALVE, if required.

6. The expansion tank is designed to be supported by the
piping system in the vertical position. If however, the
expansion tank must be installed horizontally, it must be
supported by adequate strapping (not supplied).

7. The expansion tank, pipes, and connections may in
time leak. Put the expansion tank in a place where a
water leak will not damage anything. The expansion tank
should be located in an area where water leakage from
the tank or connections will not result in damage to the
area around the expansion tank or to the lower fl oors of
the structure.

WARNING: A residential tank must be
installed vertically or horizontally. Do not
install on a dead end pipe or in an overhead
joist space. *See Figure 1 for installation.

1. The water supply and power (electricity or gas) must
be shut off during the installation of the valves and
expansion tank. Follow the instructions found on the
water heater and in the owner’s manual.

2. Install expansion tank, pressure gauge and pressure
reducing valve, if required.

3. Once tank and other components are installed, fi ll
system and check for any leakage. Make repairs if
necessary.

4. Before initial fi ring of the water heater, open a hot
water fi xture and draw water until all air is removed from
the system. Turn the water heater temperature control
to desired ending temperature level (See water heater
instructions).

5. To relieve initial thermal expansion, slightly open a
hot water faucet. Continue until water heater aquastat
temperature is satisfi ed. Once heater is at its operating
range, no further bleeding of expanded water is required.

6. The system water heater and expansion tank will now
be operational. The expansion tank will absorb pressure
increases caused by thermal expansion to a level well
below the water heater relief valve setting.

Recommended inlet water pressure is 60 PSI (414 kPa) or
less. Refer to the pressure gauge. Adjust the
pressure reducing valve to increase or decrease the
pressure as required. Open a nearby faucet allowing
water to run briefl y then close the faucet. Check the
pressure gauge again and make additional adjustments
as necessary. This process may need to be repeated
several times before the pressure can be adjusted to 60
PSI (414 kPa) or less.