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Pre-Installation
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.
Do not use Oxygen-Explosive.
Pre-charge with nitrogen or dry air
(-50°F/-46°C dew point or lower)
4. Pre-charge to 2 psig (0.14 bar) below system static pressure
at tank location.
Never pre-charge below 25% of the system
maximum rated pressure.
5. Remove charging hose. Carefully test charging valve for leakage.
6. Replace plastic cap.
Protect against freezing temperatures.
Can cause damage and/or product failure.
Isolate expansion chamber during system
hydro test.
Operation
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, expand-
ed 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.
Maintenance
1. Sprinkler system must be maintained and inspected per
NFPA 25.
Figure 1
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