4
B & G Pressure
Reducing Valve
with Check
Cold
Water
Fill
B & G
Model 107A
High Capacity
Air Vent
From
Boiler
or HX
B & G
Rolairtrol
Air
Separator
Drain
Valve
Lock-Shield
Valve
2
3
B & G Suction
Diffuser
B & G
System
Pump
To System
B & G Triple Duty Valve
See Table A for Pipe Size
1
1
Pre-Charging Air
Connection
B & G Pressurized Tank (Series D)
Tanks May be Floor Mounted
with BLZ Leg Assemblies
See Fig. 1 for Series B Tank Mounting
B & G #7 or #87
Air Vent
Pressure
Gage
Cold
Water
Fill
From
Boiler
or HX
B & G Pressure Reducing Valve
with Check
B & G
Model 107A
High Capacity
Air Vent
B & G Rolairtrol
Air Separator
Drain
Valve
Lock-Shield
Valve
See Table A for
Pipe Sizing
B & G #7
or #87
Air Vent
Pressure
Gage
Tank Purge
Valve
B & G
Suction
Diffuser
B & G System Pump
To System
B & G Triple Duty Valve
Alte
rn
ate
Pre-Charging
Air Connection
B & G Pressured
Expansion
Tank
(Series B or
Series D-Vertical)
Tank Purge
Valve
FIGURE NOTES
1. Tank connection locations may vary depending on the type of tank to be installed.
2. Provide an anti-thermosyphon loop with a minimum drop of 12" to prevent gravity heating of the tank.
3. Figures 1 and 2 show where a tee would be located if multiple expansion tanks are installed.
Figure 1
Vertical Tank Installation with Rolairtrol Air Separator
Figure 2
Horizontal Tank Installation with Rolairtrol Air Separator
Fitting
Size, in.
No. of Vents
Recommended
1, 1 /
1 / , 2
2 / , 3
1 B & G Model 107 A
1
2
Pre-Charging Air
Connection
1
1
B & G Pressurized Tank (Series D)
Tanks May br Floor Mounted
with BLZ Leg Assemblies
See Fig. 1 for Series B Tank Mounting
B & G #7 or #87
Air Vent
Pressure
Gage
B & G #7 or #87
Air Vents
See Table
Above
B & G Pressure
Reducing Valve
with Check
Air
Eliminator
Fitting
Cold
Water
Fill
B & G Flo-Control Valve
or Triple Duty Valve
See Table A
on Page 5
For Pipe Size
B & G System Pump
To System
Dirt Leg
8" Long Minimum
Drain
Valve
2
Lock-Shield
Valve
From System
Drain
Pipe
B & G
Relief Valve
Boiler
1
2
1
2
1
2
Tank
Purge Valve
Figure 3 - Typical Piping with IAF In-Line
Air Separator and Airtrol Boiler Fitting
Figure 4 - Tank Installation with IAS
In-Line Air Separator
Cold
Water
Fill
Drain
Pipe
From System
Tank or
Boiler
B & G Pressure Reducing Valve
with Check
B & G
Relief Valve
B & G Model 107 A
High Capcity
Air Vent
Typical Piping
with Airtrol Boiler Fitting
B & G
Airtrol
Boiler
Fitting
Manual
Vent
IAF 2" to IAF 4"
Follow
Figure 1 or 2
for Tank and
Pump Piping
B & G Model 107 A
High Capcity Air Vent
B & G
Relief Valve
When Required
Manual
Vent
B & G Pressure
Reducing Valve
with Check
Cold
Water Fill
From Boiler
or Heat
Exchanger