This expansion tank and the entire system must be checked annually by a qualified professional.
Visually examine the tank and its connection to the system piping looking for any signs of water leakage or corrosion on the
exterior of the tank or the connection.
If this expansion tank shows any visible signs of leaking, corrosion or rusting, the tank must be replaced
immediately to avoid personal injury or property damage. Do not adjust the tank air pressure if there
are any signs of corrosion on the tank. Failure to follow these instructions may result in serious injury or death and or
property damage.
D I ME N S I ON S & C A P A C I T I E S
Rev. 6.18
Visually inspect the product for any signs of damage that may have occurred during transportation. If the tank is dented, bent
or scratched, return the product to the original purchase point for replacement.
This expansion tank is shipped from the factory with a pre-charge of 12 psi. Any adjustments to the factory pre-charge
must be done prior to initial tank installation and with 0 psi pressure on the system. DO NOT ADJUST THE PRE-CHARGE
OF THE EXPANSION TANK WITH THE SYSTEM UNDER PRESSURE!
The expansion tank should be pre-charged to
match the boiler fill valve setting.
failure to properly adjust the pre-charge will shorten the life expectancy of the product.
Remove the protective cap from the air valve.
Check the tank pre-charge pressure using a standard tire pressure gauge.
If required add air to the tank using a manual bicycle tire pump until the proper pre-charge pressure is reached.
Replace the protective cap on the air valve.
T Y P I C A L I N S T A L L A T I O N S
P.O.
Inlet
To
System
In Line
Expansion
Pressure
Relief
Valve
Auto Fill
Valve
Air
Separator
Flow
Check
Air
Vent
P.O.
Vertical
Floor
Mount
Expansion
Tank
Inlet
To
System
Pressure
Relief
Valve
Auto Fill
Valve
Air
Separator
Flow
Check
Air
Vent
S X H T
S E R I E S
H T X
S E R I E S
M
ATERIALS
OF
C
ONSTRUCTION
Tank: 16-gauge, cold rolled steel
Finish: Appliance quality paint for corrosion resistance
Water Chamber SXHT: Top diaphragm is 100 % butyl rubber, lower
water chamber is copolymer polypropylene
Diaphragm Material HTX: 100% butyl rubber
Connection: Welded steel
Testing: High pressure, seam weld, helium, final pre-charge check
Air Valve: Brass valve with o-ring seal
Warranty:
5 years
Boiler
Output
1000’s
BTUH
Copper
Baseboard
& Radiant
Type of Radiation
Convectors & Unit Cast Iron
Cast Iron
Heaters
Radiators Baseboard
25
HTX 15
HTX 15
HTX 15
HTX 15
50
HTX 15
HTX 30
HTX 30
HTX 30
75
HTX 30
HTX 30
HTX 60
HTX 60
100
HTX 30
HTX 30
HTX 60
HTX 60
125
HTX 30
HTX 60
HTX 60
HTX 60
150
HTX 30
HTX 60
HTX 90
HTX 90
175
HTX 60
HTX 60
HTX 90
HTX 90
200
HTX 60
HTX 60
HTX 90
HTX 90
250
SXHT 30
SXHT 30
SXHT 40
SXHT 30
300
SXHT 30
SXHT 40
SXHT 40
SXHT 30
350
SXHT 30
SXHT 40
SXHT 60
SXHT 40
400
SXHT 30
SXHT 60
SXHT 90
SXHT 40
500
SXHT 40
SXHT 60
SXHT 90
SXHT 40
600
SXHT 40
SXHT 90
SXHT 90
SXHT 60
700
SXHT 60
SXHT 90
SXHT 90
SXHT 60
800
SXHT 60
SXHT 110
SXHT 110
SXHT 90
900
SXHT 60
SXHT 110
SXHT 110
SXHT 90
1000
SXHT 90
SXHT 110
SXHT 110
SXHT 90
1.
Drain boiler system or isolate the area where expansion
tank will be installed.
2.
Install expansion tank on supply side of the boiler, on
the suction side of the circulator. Adequate thread sealant
(pipe dope) must be added to ensure a leak free
installation.
3.
Connect system piping to discharge opening of the tank
using a tee, air scoop, or other suitable tapping in the
system.
4.
Pressurize the system and check for leaks.
5.
Restart the boiler system.
The tank
(HTX) is designed to be supported by system piping. Make
sure that there is adequate means of supporting the system piping
and, if necessary, add strapping, brackets, or pipe hangars.
DO NOT INSTALL THIS EXPANSION TANK IN THE HORIZONTAL
POSITION.
Maximum working pressure 100 psig. Maximum working temperature, 240 F. Tank pre-charge 12 psig.
Note: HTX series expansion tanks ARE NOT suitable for potable water and are only to be used on closed systems.
Model
Capacity
(gallons)
Acceptance
Volume
(@12/30 PSIG)
Max.
Acceptance
Volume
Dimensions
(inches)
Weight
(lbs)
Connection
Size
(C)
Diameter
(B)
Height
(A)
HTX 15
2.1
.85
1.0
½” MPT
8
11.6
6
HTX 30
4.8
1.9
2.4
½” MPT
11
14.5
10
HTX 60
6.0
2.9
3.6
½” MPT
11.4
17.6
11
HTX 90
15.0
6.0
6.0
¾” MPT
16
20.8
28
SXHT 30
15.0
6.0
6.0
1” FPT
16
21.7
32
SXHT 40
20.0
8.0
8.0
1” FPT
16
28.8
39
SXHT 60
33.0
13.3
13.3
1” FPT
16
42.8
57
SXHT 90
44.0
17.7
17.7
1 ¼” FPT
21
36.2
72
SXHT 110
62.0
24.9
24.9
1 ¼” FPT
21
47.9
112
SXHT 160
81.0
32.6
32.6
1 ¼” FPT
21
62.0
123
QUICK SIZING CHART
H T X S E R I E S
H T X S E R I E S
A
B
C
S X H T S E R I E S
A
B
C
