SUPERSEDES: September 15, 2015
Effective: June 13, 2022
402-080
Plant ID No. 001-5043
Instruction Sheet
4900 Series Air Separators
4900 Series Air & Dirt Separators
Taco 4900 series separators are designed and fabricated to ASME Code
for Unfired Pressure Vessels, Sect. VIII Div. 1.
Prior to shipment all separators are hydrostatically tested to 1.3 times their
rated working pressure and certified by an independent Authorized inspec-
tor.
Upon receipt of each separator, the ship-
ping container should be examined for
external damage. If the shipping container
has been damaged in transit, the contents
of the packaging should also be examined
prior to acceptance of the shipment. If the
separator appears to be damaged the
shipment should be refused and or signed
for as damaged. If the separator is dam-
aged, the local Taco representative should
be contacted for further instructions.
WARNING: DO NOT BRAZE PIPING TO THE NOSE OF THE VENT;
PERMANENT DAMAGE WILL OCCUR TO THE AIR VENT INTERNAL
PARTS.
INSTALLATION
TO BE INSTALLED BY PROFESSIONAL INSTALLERS ONLY
4900A – Air Separators
Taco 4900A series separators are designed for installation in hydronic
systems. The purpose of the 4900A separator is the removal of air from
the heating or chilled water system. In a heating system application the
separator should be mounted in the piping as close as possible to the exit
of the boiler and upstream of the pumps in the system. These units are
not designed to withstand external piping loads which may be transmit-
ted to the nozzles from the piping system. Should external piping loading
requirements be present, confirmation from Taco’s Design Engineering
department regarding the suitability of the separator’s design should be
obtained prior to installing this product. External piping must be supported
within the design of the external piping system.
When separators are installed, care should be taken to allow access to
the ASME name plates, air vent (located at the top of each separator),
flushing cock (located at the side of each unit) and drain plug (installed in
the bottom of each unit).
All piping to each separator should be installed full size, to match the ves-
sel’s connections, isolation valves on each side of the unit should be in-
stalled for future maintenance. The isolation valves are used during main-
tenance to reduce the loss of system fluid.
See Warning under General section.
4900AD – Air and Dirt or Dirt (D) Separators with or without
Switchable On/Off Magnet
Installation notes from 4900A - Air Separators in previous paragraphs ap-
ply to 4900 Air and Dirt Separators as well. On 4900AD air and dirt sep-
arators the drain/blowdown valve located at the bottom of the unit should
be piped to drain. This connection should be piped with a full port shutoff
valve to a nearby drain during installation.
WARNING: FAILURE TO COMPLY WITH THESE
INSTRUCTIONS REGARDING THIS PRODUCT CAN
RESULT IN SERIOUS PERSONAL INJURY OR DEATH AND/
OR SEVERE PROPERTY DAMAGE.
DIAGRAM 1 – LOCATION OF TANK FITTINGS
SUPERCEDES: December 8, 2014
EFFECTIVE: September 15, 2015
4900 Series Air Separators
4900 Series Air and Dirt Separators
Installation, Operation & Maintenance Manual
402-080
GENERAL
All Taco 4900 series separators are designed and fabricated in
accordance with the ASME Code for Unfired Pressure Vessels,
Sect. VIII Div. 1.
Prior to shipment all separators are hydrostatically tested to 1.3
times their rated working pressure and accepted by an indepen-
dent insurance inspector.
Upon receipt of each separator, the shipping container should be
examined for external damage. If the shipping container has been
damaged in transit, the contents of the packaging should also be
examined prior to acceptance of the shipment. If the separator
appears to be damaged the shipment should be refused and or
signed for as damaged. If the separator is damaged, the local Taco
representative should be contacted for further instructions.
WARNING: DO NOT BRAZE PIPING TO THE NOSE OF THE
VENT; PERMANENT DAMAGE WILL OCCUR TO THE AIR
VENT INTERNAL PARTS.
INSTALLATION
TO BE INSTALLED BY
PROFESSIONAL INSTALLERS ONLY
4900A – Air Separators
Taco 4900A series separators are designed for installation in
hydronic systems. The purpose of the 4900A separator is the
removal of air from the heating or chilled water system. In a heating
system application the separator should be mounted in the piping
as close as possible to the exit of the boiler and upstream of the
pumps in the system. These units are not designed to withstand
external piping loads which may be transmitted to the nozzles from
the piping system. Should external piping loading requirements be
present, confirmation from Taco’s Design Engineering department
regarding the suitability of the separator’s design should be
obtained prior to installing this product. External piping must be
supported within the design of the external piping system.
When separators are installed, care should be taken to allow
access to the ASME name plates, air vent (located at the top of
each separator), flushing cock (located at the side of each unit)
and drain plug (installed in the bottom of each unit).
All piping to each separator should be installed full size, to match
the vessel’s connections, isolation valves on each side of the unit
should be installed for future maintenance. The isolation valves
are used during maintenance to reduce the loss of system fluid.
See Warning under General section.
4900AD – Air and Dirt or Dirt (D) Separators
Taco 4900AD series separators are designed for installation in
hydronic systems. The purpose of the 4900AD separator is the
removal of air and dirt from the heating or chilled water system. In
a heating system application, the separator should be mounted in
the piping as close as possible to the exit of the boiler and upstream
of the pumps in the system. These units are not designed to with-
stand external piping loads which may be transmitted to the nozzles
from the piping system. Should external piping loading require-
ments be present, confirmation from Taco’s Design Engineering
department regarding the suitability of the separator’s design
should be obtained prior to installing this product.
When separators are installed, care should be taken to allow access
to the ASME name plates, air vent (located at the top of each sepa-
rator), and flushing cock (located at the side of each unit). On
4900AD air and dirt separators the drain/blowdown valve located at
the bottom of the unit should be piped to drain. This connection
should be piped with a full port shutoff valve to a nearby drain during
installation.
All piping to each separator should be installed full size, to match
the vessel’s connections, isolation valves on each side of the unit
should be installed for future maintenance. The isolation valves
are used during maintenance to reduce the loss of system fluid.
See Warning under General section.
WARNING: FAILURE TO COMPLY WITH THESE INSTRUCTIONS
REGARDING THIS PRODUCT CAN RESULT IN SERIOUS PER-
SONAL INJURY OR DEATH AND/OR SEVERE PROPERTY DAMAGE.
SUPERCEDES: December 8, 2014
EFFECTIVE: September 15, 2015
4900 Series Air Separators
4900 Series Air and Dirt Separators
Installation, Operation & Maintenance Manual
402-080
GENERAL
All Taco 4900 series separators are designed and fabricated in
accordance with the ASME Code for Unfired Pressure Vessels,
Sect. VIII Div. 1.
Prior to shipment all separators are hydrostatically tested to 1.3
times their rated working pressure and accepted by an indepen-
dent insurance inspector.
Upon receipt of each separator, the shipping container should be
examined for external damage. If the shipping container has been
damaged in transit, the contents of the packaging should also be
examined prior to acceptance of the shipment. If the separator
appears to be damaged the shipment should be refused and or
signed for as damaged. If the separator is damaged, the local Taco
representative should be contacted for further instructions.
WARNING: DO NOT BRAZE PIPING TO THE NOSE OF THE
VENT; PERMANENT DAMAGE WILL OCCUR TO THE AIR
VENT INTERNAL PARTS.
INSTALLATION
TO BE INSTALLED BY
PROFESSIONAL INSTALLERS ONLY
4900A – Air Separators
Taco 4900A series separators are designed for installation in
hydronic systems. The purpose of the 4900A separator is the
removal of air from the heating or chilled water system. In a heating
system application the separator should be mounted in the piping
as close as possible to the exit of the boiler and upstream of the
pumps in the system. These units are not designed to withstand
external piping loads which may be transmitted to the nozzles from
the piping system. Should external piping loading requirements be
present, confirmation from Taco’s Design Engineering department
regarding the suitability of the separator’s design should be
obtained prior to installing this product. External piping must be
supported within the design of the external piping system.
When separators are installed, care should be taken to allow
access to the ASME name plates, air vent (located at the top of
each separator), flushing cock (located at the side of each unit)
and drain plug (installed in the bottom of each unit).
All piping to each separator should be installed full size, to match
the vessel’s connections, isolation valves on each side of the unit
should be installed for future maintenance. The isolation valves
are used during maintenance to reduce the loss of system fluid.
See Warning under General section.
4900AD – Air and Dirt or Dirt (D) Separators
Taco 4900AD series separators are designed for installation in
hydronic systems. The purpose of the 4900AD separator is the
removal of air and dirt from the heating or chilled water system. In
a heating system application, the separator should be mounted in
the piping as close as possible to the exit of the boiler and upstream
of the pumps in the system. These units are not designed to with-
stand external piping loads which may be transmitted to the nozzles
from the piping system. Should external piping loading require-
ments be present, confirmation from Taco’s Design Engineering
department regarding the suitability of the separator’s design
should be obtained prior to installing this product.
When separators are installed, care should be taken to allow access
to the ASME name plates, air vent (located at the top of each sepa-
rator), and flushing cock (located at the side of each unit). On
4900AD air and dirt separators the drain/blowdown valve located at
the bottom of the unit should be piped to drain. This connection
should be piped with a full port shutoff valve to a nearby drain during
installation.
All piping to each separator should be installed full size, to match
the vessel’s connections, isolation valves on each side of the unit
should be installed for future maintenance. The isolation valves
are used during maintenance to reduce the loss of system fluid.
See Warning under General section.
WARNING: FAILURE TO COMPLY WITH THESE INSTRUCTIONS
REGARDING THIS PRODUCT CAN RESULT IN SERIOUS PER-
SONAL INJURY OR DEATH AND/OR SEVERE PROPERTY DAMAGE.
INITIAL SYSTEM FILL
WARNING:
Prior to the initial filling of the system the automatic air vent
installed in the top of the separator should be closed to prevent system
debris from fouling the venting mechanism. The automatic air vent may
be manually closed by turning the orifice screw located in vent face
clockwise until seated. Additionally, the flushing cock installed on the side
of the separator should be opened to allow the air within the system to
exit during the system filling process. The flushing cock should be closed
when system fluid first appears to exit the separator from the flushing
cock.
Upon the completion of the system filling process the orifice of the
automatic vent should be re-opened by turning the screw 1 to 1½ turns
counter-clockwise. Do not overturn the screw beyond 1 to 1½ turns.
4"
OPTIONAL
SWITCHABLE
ON/OFF
STYLE
MAGNET
USE SUFFIX
M, FOR EX.
4904ADM-125
SIDE VIEW
