Amtrol ST-210V Please Read the Following Instructions Carefully, Pre-Installation, Maintenance

PLEASE READ THE FOLLOWING INSTRUCTIONS CAREFULLY

IMPORTANT GENERAL SAFETY INFORMATION -

ADDITIONAL SPECIFIC SAFETY ALERTS APPEAR IN THE FOLLOWING INSTRUCTIONS.

Pre-Installation

1Ensure expansion tank is sized properly for application (Figure 1).

2.Remove plastic cap from air valve.

3.With tank empty of water, adjust air precharge to match cold water supply pressure.

4.Replace and tighten plastic cap on air valve.

5.Therm-X-Trol®ST-5, ST-8, ST-12 only: Insert Turbulator into connector (optional).

FAILURE TO PROPERLY SEAL VALVE CAP

WILL RESULT IN LOSS OF PRECHARGE

CAUSING PRODUCT TO FAIL.

Installation

1.Install the expansion tank on the cold water supply line to the water heater at a point between the water heater and backflow preventer or other one-way device (Figure 2).

Mount tank vertically only. Ensure the piping can support the entire weight of the tank when full

of water.

Models ST-25V through ST-210V are floor standing and may not be hung from the piping.

2.Once the expansion tank is installed, check the cold water supply 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 (see water heater instructions). Do not set temperature higher than the expansion tank maximum.

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.

5.The water heater and expansion tank will now be operational. The expansion tank will control pressure increases caused by thermal expansion to a level below the water heater relief valve setting.

Maintenance

A professional plumber should check the complete system, including the expansion tank, yearly and more frequently as the system ages. Checking the precharge allows a small quantity of air to escape and can result in an insufficient air charge. Always check the precharge while the tank is isolated and empty of water, and be sure to maintain the proper precharge whenever the tank is inspected.

Warranty

ST-5 through ST-25V Models: Five (5) Year Limited Warranty

ST-30V through ST-210V Models: One (1) Year Limited Warranty

T-5 through T-12 Models: One (1) Year Limited Warranty

Visit www.amtrol.com for complete warranty details.

Figure 1.

Expansion Tank Volume (Gal.)

Maximum Temperature Setting 140°F

Water Heater	Static Supply Pressure (psig)
Size
	40	60	80
(gals.)
40	2.0	2.0	2.0
50	2.0	2.0	2.0
60	3.2	3.2	3.2
80	3.2	3.2	4.4
120	4.4	4.4	10.3

Expansion Tank Volume (Gal.)

Maximum Temperature Setting 160°F

Water Heater	Static Supply Pressure (psig)
Size
	40	60	80
(gals.)
40	2.0	2.0	3.2
50	2.0	3.2	3.2
60	3.2	3.2	4.4
80	3.2	4.4	10.3
120	4.4	10.3	10.3

Expansion Tank Volume (Gal.)

Maximum Temperature Setting 180°F

Water Heater	Static Supply Pressure (psig)
Size
	40	60	80
(gals.)
40	3.2	3.2	3.2
50	3.2	3.2	4.4
60	3.2	4.4	10.3
80	4.4	10.3	10.3
120	10.3	10.3	10.3

Sizing based on: 40°F incoming water temperature; 150 psi T&P safety relief valve; Pre-charge equal to static supply pressure.

For larger applications: Visit amtrol.com, download the AMTROL App or contact Technical Support at 401.535.1216.

Figure 2.

Backflow Preventor, Check Valve	Backflow Preventor
or Pressure Reducing Valve	Check Valve or
	Pressure Reducing Valve

Cold				Hot Water	Hot Water
Water				Cold
				Water
Supply
				Supply
Thermal Expansion Tank					Thermal
				T & P	Expansion Tank
					T & P
				Relief
Turbulator Installation: Therm-X-Trol		®	Models Only		Relief
				Valve
					Valve
				Water
				Heater
3/4” Threaded Tee	Press Turbulator fully				Water
Turbulator					Heater
	into connector prior
Tank Connector	to installing tank.

In-Line Models

Stand Models

1400 Division Road, West Warwick, RI USA 02893

T:800.426.8765 F: 800.293.1519 www.amtrol.com

Mark of the Originator

© 2014 AMTROL Inc. Part #: 9015-087 (06/14)