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Bell & Gossett's line of manual and automatic air vents are designed to remove troublesome air in the system. Free shipping on orders over $99. Bell & Gossett Air Vents. Automatic Air Vent Model No. 98, 1/2' High Cap. (Female Threaded). Bell & Gossett float-operated automatic air vents, designed to vent air from hydronic heating systems, and air vent repair parts. B&G 4V is a 1/8'IPM coin operated manual air for venting radiators in hot water heating systems. 150 psi maximum and 250 degree F. About State Supply. Mar 20, 2019  The Valve is used to manual air vent for radiators. Manual vent opening through screw driver or designated key which can be found on our other auction. Please make sure that you are picking the right size, this table will help you to make correct choice (BSP standard). Considering replacing manual air vents with automatic ones on top floor radiators. Existing key vent valves are attached to panels and connected to the radiator with 1/8' copper tubing. 50 years of removing the panels to clean is resulting in joint failures. Bell & Gossett A01500I Pressurized Expansion Tanks (ASME) User Manual. Point of connection, Installation. Bell & Gossett Air equipment. Shut-off and drain valves or tank purge valve B&G TPV must be. Automatic air vent and a pressure gauge must be installed in the piping.

1. B&g Manual Air Vent
2. Automatic Air Vent Valve Water

GOLD CGi Gas-Fired Water Boiler — Boiler Manual

46

Part Number 550-110-710/0107

10b

❏

Check/test . . .

Gas piping

1. Sniff near floor and around boiler area for any in-

dication of a

gas leak

.

0018.

Test gas piping using bubble test,

per Section

5

of this manual, if there is any indication of a leak.

Cold fill and operating pressures

1. While the system is cold, note the

pressure reading

on the boiler pressure/temperature gauge. Verify that

cold fill pressure is correct.

0018.

Watch the pressure

as the boiler and system heat

up to ensure pressure rise is normal. Too high a rise

would indicate a waterlogged or undersized expan-

sion tank.

Air vents and air elimination

B&g Manual Air Vent

1. Inspect automatic air vents (if used). Also inspect

air separators to ensure they are operational.

0018. The cap must be unscrewed one turn to allow air to

escape.

3. See

Figure 34

. If the air vent is leaking, remove cap

A

and briefly push valve

B

and then release to clean

the valve seat.

4. Replace cap

A

by twisting all the way onto valve

B

and then unscrewing one turn.

Figure 34

Automatic air vent, typical

Limit controls and cutoffs

1. Inspect and test the boiler limit control. Verify op-

eration by turning control set point below boiler

temperature. Boiler should cycle off. Return dial to

original setting.

0018. Inspect and test additional limit controls or low

water cutoffs installed on system.

Expansion tank

1. Expansion tanks provide space for water to move in

an out as the heating system water expands due to

temperature increase or contracts as the water cools.

Tanks may be open, closed or diaphragm or bladder

type. See Section

4

of this manual for suggested best

location of expansion tanks and air eliminators.

Open-type

— located above highest radiator or

baseboard unit, usually in the attic or closet. Has a

gauge glass and overflow pipe to a drain.

Closed-type

— welded gas tight and located above

boiler. Tank is partially filled with water, leaving an

air cushion for expansion.

• Make sure this type of tank is fitted with a

tank

fitting

, such as the B & G Tank-Trol or Taco

Taco-Trol. This fitting reduces gravity circula-

tion of air-saturated tank water back to the

system and prevents the air from bubbling up

through the water as it returns from the sys-
tem.

•

Do not use automatic air vents in systems

with closed-type tanks.

The air will escape

from the system instead of returning to the tank.

Eventually, the tank will waterlog and no longer

control pressurization. The boiler relief valve

will weep frequently.

Diaphragm- or bladder-type

— welded gas tight

with a rubber membrane to separate the tank pres-

surizing air and the water. May be located at any

point in the system, but most often found near the

boiler.

• Systems with this type of expansion tank require

at least one

automatic air vent

, preferably lo-

cated on top of an air eliminator, as shown in

examples in manual Section

4

.

0018. If relief valve has tended to weep frequently, the ex-

pansion tank may be waterlogged or undersized.

Closed-type tank

— tank is most likely water-

logged. Install a tank fitting if not already installed.

Then check fill level per fitting manufacturer’s

instructions. If fill level is correct, check tank size

Automatic Air Vent Valve Water

against manufacturer’s instructions. Replace with

a larger tank if necessary.

Diaphragm- or bladder-type

— first, check tank

size to be sure it is large enough for the system. If

size is too small, add additional tank(s) as neces-

sary to provide sufficient expansion. If tank size is

large enough, remove tank from system and check

charge pressure (usually 10018 psig for residential ap-

plications). If tank won’t hold pressure, membrane

has been damaged. Replace tank.

Service & maintenance – annual start-up

(cont.)

2

POINT OF CONNECTION

A. General

The Series B and Series D tanks work equally well when installed in the
vertical or horizontal position. When Series B tank is installed horizontally,
the system connection must be located below the centerline of the tank.
The Series B-LA tanks must be installed in vertical position. They cannot
be installed in the horizontal position.

The pressurized expansion tank-to-system piping differs from the
“standard” compression tank piping in several major aspects:

1. Air from the system must be purged to the atmosphere and not allowed

to enter the tank.

2. Tank-to-system piping must not be pitched-up to the tank.

3. Shut-off and drain valves or tank purge valve B&G TPV must be

installed in the tank-to-system piping in order to properly check and
recharge the tank air after the system has been filled with water.

4. Airtrol Tank Fitting (ATF or ATFL) is not required.

B. Piping

Typical tank-to-system and air vent piping are illustrated by Figures 1 thru
6. Some general notes regarding this piping are listed below:

1. The connection point from tank-to-system represents the point of no

pressure change. This means that the expansion tank must be
connected as close as possible to the suction side of the system
circulating pump for proper system operation.

2. The branch piping to the tank must be attached to the main to minimize

the possibility of air and debris entering the tank piping. If connected
to the horizontal main, do not use top (12 o'clock) and bottom (6 o'clock)
positions. Side connections are the proper positions. If connection
must be made at the bottom, a dirt trap leg with a flushing drain valve,
such as shown in Figure 4, should be installed.

3. Table A shows the recommended pipe sizes. Note that the MBH

column represents the output of the heat generator (firing rate, etc.).
The pipe sizes are selected for very low pressure loss in the tank-to-
system piping to accommodate system operating pressures within
10% of the relief valve setting. However, if the actual system operating
pressure is less than 80% of the relief valve setting, the tabulated pipe
size above 1' may be reduced by one size.

Pipe sizes 1' or less must not be changed due to the greater possibility
of fouling in the smaller pipes.

4. In order to change the tank air charge pressure it is necessary to isolate

the tank circuit from the main system piping. A high quality, gate type
or TPV, lock-shield valve must be used for this purpose. The lock-
shield for the valve stem will eliminate tampering of this normally open
valve during normal system operation.

5. In addition to the lock-shield valve above TPV or a drain valve,

automatic air vent and a pressure gauge must be installed in the piping.
The drain valve is used for flushing (item 2 above) and to drain the
water out of the tank for proper air charging.

6. Tank sizing calculations are based on minimum temperature rise of the

air in the tank. For this reason, an anti-thermosyphon loop must be
formed in the tank-to-system piping to minimize the effects of gravity
(thermal) circulation into the tank. A drop leg from 12' to 20' long is
usually sufficient. It is also suggested that this piping and tank not be
insulated (heating systems only).

7. Allow an overhead clearance for the Series B of at least 36' to remove

the bladder through the flanged opening in case replacement is
required. For bladder replacement of the Series B-LA tanks, the tank
must be removed from the system.

INSTALLATION

1. Note location of system connection, air charge valve and drain

connection on tank.

2. Remove the plug or pipe cap from the system connection.

3. Remove the 1

1

/

2

' NPT plug covering the air charge valve.

4. Before making any connection to the tank, check the tank and air

charge (use an accurate pressure gauge). The air pressure must be
equal to the minimum system pressure at the tank location.

5. After making sure the air charge is correct, replace the 1

1

/

2

' plug over

the air valve.

6. The tank may now be piped to the system (use the suggested tank

piping diagram on page 4 and 5).

7. Using table A, select appropriate pipe size. Connection to each tank

must have a lock shield gate valve or TPV and union to allow isolation
and removal if required. Make up and fill valves, whether manual or
automatic, should be tied into the connecting line. This will ensure that
pump operation will not affect valve operation.

CAUTION: Pump cavitation and unbalanced circuits can result
from improper tank location. Connect tank as close to suction

side of system circulating pump as possible. Failure to follow this
instruction could result in property damage and/or moderate personal
injury.

WARNING: This product must be installed by a qualified
professional. Failure to follow the instruction in accompanying

manual may cause a rupture or explosion which may result in serious
injury or death and property damage.

WARNING: CALIFORNIA PROPOSITION 65 WARNING!
This product contains a chemical known by the State of

California to cause cancer and to cause birth defects or other
reproductive harm. (California Installer/Contractor – California law
requires that this notice be given to consumer/end user of this product.

CAUTION: A blocked connection to the expansion tank will
cause system to become overpressurized resulting in periodic

discharge of system relief valve. This periodic discharge will require that
fresh water be added to the system to maintain pressure. The resulting
addition of fresh water will cause corrosion in system components. The
use of a bottom connection to the main requires the use of dirt trap leg
with a flushing drain valve. Failure to follow these instructions could
result in property damage and/or moderate personal injury.

WARNING: System overpressurization will result if expansion
tank isolation valve is not kept open during normal operation.

Provisions must be made to lock this valve open during normal system
operation. Failure to follow these instructions could result in serious
personal injury or death and property damage.

WARNING: Do not locate this product where leaking or flood
could cause damage to the surrounding property. A drip pan

connected to an adequate drain must be installed if leaking or flooding
could cause property damage. Failure to follow this instruction could
result in property damage.

CAUTION: Lack of or improperly sized air vent will cause
system circulation problems. An automatic air vent must be

installed in the line to the expansion tank and at air separating devices
as shown in Figures 1 thru 6. These must be sized to vent off any
accumulated air. Failure to follow these instructions could result in
property damage and/or moderate personal injury.