FAILURE TO PROPERLY SEAL THE VALVE CAP 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. Therm-X-Trol ST5C-DD and ST12C-DD only: Insert Turbulator
into connector.
5. 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). Mount vertically only.
6. Once the THERM-X-TROL
is installed, check the city supply
line for any leakage. Make repairs if necessary.
7. 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).
8. 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.
9. The system water heater and THERM-X-TROL
will now
be operational. The THERM-X-TROL
will control 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 temperature 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
© 2018 AMTROL Inc.
Part #: 9017-091 (01/18)
1400 Division Road, West Warwick, RI 02893 USA
T: 800.426.8765 F: 800.293.1519
www.amtrol.com
PLEASE READ THE FOLLOWING INSTRUCTIONS CAREFULLY
IMPORTANT GENERAL SAFETY INFORMATION -
ADDITIONAL SPECIFIC SAFETY ALERTS APPEAR IN THE FOLLOWING INSTRUCTIONS.
THERM-X-TROL
Expansion Tank
CWS
BFP, Check or PRV
Hot Water
T & P
Valve
Water
Heater
LOW-LEAD
Backflow Preventor, Check Valve
or Pressure Reducing Valve
Turbulator
™
Installation (ST-5C-DD & ST-12C-DD only)
Thermal
Expansion
Tank
Cold
Water
Supply
Hot Water
T & P
Relief
Valve
Water
Heater
Press Turbulator fully into
connector prior to
installing tank.
3/4” Threaded Tee
Turbulator
Tank Connector
ST-20VC
