Amtrol THERM-X-TROL ST-20V-C Installation & Operation Instructions

West Warwick, Rhode Island 02893
This product must be installed by a qualified
professional.
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 potable water. Do not operate in a setting
where the temperature can exceed 200° F or fall
below 35° F and do not exceed the maximum working pressure speci-
fied for this product.
RUPTURE OR EXPLOSION HAZARD. Like most
pressurized tanks, this tank can over time corrode,
weaken, and burst or explode.
Do not adjust the pressure or re-pressurize this
product except for any adjustments at the time of the
initial installation when the product is new.
Do not locate this product where leaking or flooding
could cause damage to the surrounding area.
Chlorine & Aggressive Water Warning. The water
quality can significantly influence the life of your
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.
State of California Residents. This product contains
a chemical known by the State of California to cause
cancer. This product contains a chemical known by the State of California
to cause birth defects or other reproductive harm.
Pre-Installation
1. Visually inspect THERM-X-TROL for any damage. If damage exists
return roduct for replacement.
2. Adjust pre-charge to equal incoming pressure.
3. Replace and tighten plastic cap on air fitting.
For commercial water heater installations, contact AMTROL for information.
Installation
1. Install the THERM-X-TROL on the Cold Water Supply (CWS) line to
the water heater at a point between the water heater and backflow
preventer, check valve or pressure reducing valve (see Figure 1).
2. Once the THERM-X-TROL is installed, check the CWS line for any
leakage. Make repairs if necessary.
3. 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).
4. 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.
* All ST-C Series models come with a 1 year warranty. See reverse side for warranty information.
Revised 3/05
Part #9017-091
PLEASE READ THE FOLLOWING INSTRUCTIONS CAREFULLY
INSTALLATION & OPERATION
THERM-X-TROL
Thermal Expansion Absorbers
(ST-5-C Through ST-210V-C)
BACK FLOW PREVENTER
CHECK VALVE OR PRESSURE
REDUCING VALVE
CWS
Figure 1.
THERM-X-TROL
ST-5C, ST-12C
CWS
THERM-X-TROL
ST-20V-C
through ST-210V-C
5. 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.
Maintenance
1. A professional plumber should check the complete heating system,
including the THERM-X-TROL, yearly and more frequently as the
system ages.
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-5-C thru ST-210V-C) under ANSI/NSF Std 61 and
City of Los Angeles.
MARK OF THE ORIGINATOR
INSTRUCTIONS
Relief
Valve
Hot Water
Water
Heater
®
Hot Water
®
Water
Heater
®