Amtrol ST-5C, ST-201VC User Manual
THERM-X-TROL
®
THERMAL EXPANSION ABSORBERS
INSTALLATION & OPERATION INSTRUCTIONS
Models ST-5C through ST-210VC
NOTE: Inspect for shipping damage and notify freight carrier or store where purchased immediately if damage is present. To avoid risk of personal
injury and property damage, if the product appears to be malfunctioning or shows signs of corrosion, call a qualified professional immediately. Current
copies of the Product manual can be viewed at www.amtrol.com. Use proper safety equipment when installing.
THIS IS THE SAFETY ALERT SYMBOL. IT IS USED TO ALERT YOU TO POTENTIAL PERSONAL INJURY AND OTHER
HAZARDS. OBEY ALL SAFETY MESSAGES THAT FOLLOW THIS SYMBOL TO REDUCE THE RISK OF PERSONAL
INJURY AS WELL AS PROPERTY DAMAGE.
READ CAREFULLY THE PRODUCT
INSTALLATION & OPERATION INSTRUCTIONS.
FAILURE TO FOLLOW THE INSTRUCTIONS 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 QUALIFIED
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.
EXPLOSION OR RUPTURE HAZARD. THE
EXPANSION TANK MUST BE OPERATED SO
THAT THE PRESSURE DOES NOT EXCEED THE MAXIMUM
WORKING PRESSURE.
EXPLOSION HAZARD. Failure to follow the
instructions in the accompanying product manual
can cause a rupture or explosion; possibly causing serious or fatal injury,
leaking or flooding and/or property damage.
Use only with potable water system. Do not operate
in a setting with freezing temperatures or where the
temperature can exceed 200°F and do not exceed the maximum working
pressure specified for this Product in the Manual. Mount vertically only.
Chlorine & Aggressive Water: The water quality
can significantly influence the life of this Product.
You should test for corrosive elements, acidity, total solids and other
relevant contaminants, including chlorine and treat your water appropriately
to insure satisfactory performance and prevent premature failure.
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.) For more information: www.amtrol.com/prop65.html
causing serious or fatal injury, leaking or flooding 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 flooding could cause property damage.
Do not locate in an area where leakage of the tank or connections could
cause property damage to the area adjacent to the appliance or to lower
floors of the structure.
pre-charge or re-pressure this Product except for any adjustments
required at the time of initial installation, especially if Product 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 lead to Product failure, serious or fatal personal injury, leakage
and/or property damage.
local code requirement or maximum working pressure designated in the
Product Manual, whichever is less. At least once every 3 years or if
discharge is present, a licensed contractor should inspect the temperature
and pressure relief valve and replace if corrosion is evident or the valve
does not function. FAILURE TO INSPECT THIS VALVE AS DIRECTED
COULD RESULT IN UNSAFE TEMPERATURE OR PRESSURE BUILDUP WHICH CAN RESULT IN PRODUCT FAILURE, SERIOUS INJURY
OR DEATH AND/OR SEVERE PROPERTY DAMAGE AND VOID THE
PRODUCT WARRANTY.
This Product, like most Products under pressure,
may over time corrode. weaken and burst or explode,
Do not expose Product to freezing temperatures or
temperatures in excess of 240° F. Do not adjust the
EXPLOSION OR RUPTURE HAZARD A relief valve
must be installed to prevent pressure in excess of
PLEASE READ THE FOLLOWING INSTRUCTIONS CAREFULLY
LOW-LEAD
IMPORTANT GENERAL SAFETY INFORMATION -
ADDITIONAL SPECIFIC SAFETY ALERTS APPEAR IN THE FOLLOWING INSTRUCTIONS.
FAILURE TO PROPERLY SEAL WILL RESULT IN
LOSS OF PRECHARGE CAUSING PRODUCT TO FAIL.
Installation
THIS PRODUCT MUST BE INSTALLED BY A
QUALIFIED PROFESSIONAL.
1. Visually inspect THERM-X-TROL for any damage. If damage
exists return product for replacement.
2. Adjust pre-charge to equal incoming pressure.
If increasing the pre-charge pressure
above 55 psig, the following steps must
be followed:
a. Tank must be connected to the system with isolation
valve open.
b. System must be pressurized to 55-60 psi or slightly
higher than the pre-charge setting of the tank.
c. Isolation valve then needs to be closed.
d. The pre-charge pressure of the tank can now be
increased to the recommended high pressure setting.
e. Bring system up to pressure, and then open the
isolation valve to the tank.
Failure to follow these instructions could result in damage
to the bladder or diaphragm and void all warranties.
3. Replace and tighten plastic cap on air fitting.
4. Install the THERM-X-TROL on the city supply line to the
water heater at a point between the water heater and
backflow preventer, check valve or pressure reducing valve
(see Figure 1).
5. Once the THERM-X-TROL is installed, check the city supply
line for any leakage. Make repairs if necessary.
6. Before the initial firing of the water heater, open any hot
water fixture 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).
7. To relieve initial thermal expansion, slightly open a hot water
faucet. Continue until water heater aquastat temperature is
satisfied. Once heater is at its operating range, no further
bleeding of expanded water is required.
8. The system water heater and THERM-X-TROL will now be
operational. The THERM-X-TROL will control temperature
and pressure increases caused by thermal expansion to a
level well below the water heater relief valve setting.
Operation
1. The THERM-X-TROL is installed in the supply line between
the backflow preventer and the water heater. Its sealed-in air
pre-charge prevents water from entering it until the system
pressure exceeds the pre-charge pressure.
2. As the water temperature rises, expanded water enters
the THERM-X-TROL’s non-corrosive water reservoir. The
pre-charged air chamber absorbs the pressure increase,
keeping system pressures below the relief valve setting.
3. As hot water is used, the pressure in the air chamber forces
water back into the system until the THERM-X-TROL is
empty. At this point, the pressure in the air chamber once
again equals the supply pressure.
4. Water treatment is not to exceed 200° F or fall below 35° F.
NOTE: Models are listed (ST-5C through ST-210VC) under
ASME Section VIII, Division I.
Warranty
ST-5C through ST-210VC Models: One (1) Year Limited Warranty
Visit www.amtrol.com for complete warranty details.
Figure 1
BFP, Check or PRV
CWS
CWS
THERM-X-TROL
Expansion Tank
BFP, Check or PRV
THERM-X-TROL
Expansion Tank
Water
Heater
Hot Water
T & P
Valve
Hot Water
T & P
Valve
Maintenance
Water
Heater
1. A professional plumber should check the complete heating
system, including the THERM-X-TROL, yearly and more
frequently as the system ages.
1400 Division Road, West Warwick, RI 02893 USA
T: 800.426.8765 F: 800.293.1519
© 2014 AMTROL Inc. Part #: 9017-091 (01/14)
www.amtrol.com
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