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Sizing charts based on:
• Precharge matched to incoming supply
pressure prior to installation
• Incoming water temperature 40°F
• 150psi T & P safety relief valve
AMTROL’s Therm-X-Trol
®
brochure MC#4090
contains precise sizing guidelines for sytems not
covered in the above charts.
The thermal-expansion tank for domestic water
heaters, sized right, is the only logical answer to the
growing problem of thermal expansion in water
heaters protected by BFP, check valves or pressure-
reducing valves. A simple installation to the supply
side on the water heater, this small tank will eliminate
the dangerous condition so that the relief valve will not
open during normal heating cycles.
BACK FLOW PREVENTER
BFP
Water Heater*
Size (gals.)
Static Supply Pressure (psi)
**
40 ST-5 ST-5 ST-5
50 ST-5 ST-5 ST-5
60 ST-5 ST-5 ST-8
80 ST-8 ST-8 ST-12
120 ST-12 ST-12 ST-25V
40
60
80
Max. Temp. Setting 140°F
Water Heater*
Size (gals.)
Static Supply Pressure (psi)
**
40 ST-5 ST-5 ST-5
50 ST-5 ST-5 ST-8
60 ST-8 ST-8 ST-8
80 ST-8 ST-8 ST-12
120 ST-12 ST-12 ST-25V
40
60
80
Max. Temp. Setting 150°F
Water Heater*
Size (gals.)
Static Supply Pressure (psi)
**
40 ST-8 ST-8 ST-8
50 ST-8 ST-8 ST-12
60 ST-8 ST-12 ST-25V
80 ST-12 ST-25V ST-25V
120 ST-25V ST-25V ST-25V
40
60
80
Max. Temp. Setting 180°F