Amtrol fpt-1 Leaflet

© 2014 AMTROL Inc. 

Part #: 9017-123 (01/14)

1400 Division Road, West Warwick, RI  USA 02893  

T: 800.426.8765    F: 800.293.1519

Backflow preventer

with control valves

Fill cup or 

filling connection

Heated area

Drain

valve

Unheated area

Water

supply

Backflow preventer

with control valves

Fill cup or 

filling connection

Heated area

Drain

valve

Unheated area

Water

supply

EXPLOSION HAZARD. Failure to follow instruc-

tions in the accompanying product manual can 

cause rupture or explosion, possibly causing serious or fatal injury, leak-

ing or flooding and/or property damage.

1.  The FIRE-X-TROL

 

should be installed on the water supply line to the 

unhea  ted area at a point between the backflow preventer and fill cup 

connection (Figure 1).

2. Once the FIRE-X-TROL is installed, check the system for any leakage. 

Make repairs if necessary.

1.  Visually inspect FIRE-X-TROL for any damage.
2.  Hydraulic system pressure must be at zero.
3.  Attach nitrogen or dry air (-50°F/-46°C dew point or lower) supply to 

expansion chamber charging valve.

4.  Pre-charge to 2 psig (0.14 bar) below system static pressure at tank 

location.

5.  Remove charging hose. Carefully test charging valve for leakage.
6.  Replace plastic cap.

1.  The FIRE-X-TROL is installed in the supply line between the backflow 

preventer and the fill cup connection. Its sealed-in air pre-charge 

chamber prevents water from entering it until the system pressure 

exceeds the pre-charge pressure. The FIRE-X-TROL is precharged 

to 25 psig (1.7 bar).

2.  As the water/antifreeze solution temperature rises, expanded system 

fluid enters the FIRE-X-TROL’s non-corrosive reservoir. The pre-

charge air chamber absorbs the pressure increase, keeping system 

pressure below maximum system rating.

3.  As the water/antifreeze temperature decreases, pressure in the air 

chamber forces system fluid back into the system.

4.  In antifreeze systems, this sequence allows the system antifreeze 

percentage to stay constant. Additional supply of water/antifreeze 

is not needed to replace fluid that would have escaped through a  

relief valve.

1.  Sprinkler system must be maintained and inspected per NFPA 25.

Fire-X-Trol Models: One (1) Year Limited Warranty