WATEROUS ARIZONA
DOCUMENT TITLE:
150-70 / 200-100 Installation
DOC. NO.
REV NO. 1
ISSUE DATE: 6/17/2010
PAGE 30 of 38
III. AUTO Mode Initial Setting
The pressure for the FIXED mode must have been correctly set before you attempt to
adjust the AUTO mode.
1. Make sure the fire pump is operating at 100 PSI (6.9 bar) at the main discharge,
with minimal flow.
2. Place the controls on the Auto-Sync control panel to AUTO (green lights).
3. Read the main air pressure and water discharge pressure gauges.
4. The air pressure reading should be equal or up to 5% higher than the water
pressure. If the readings are in this range, go to step 7 and verify the operation at
other pressures.
5. If the air pressure is not 5% of the water pressure, adjust it as follows:
If the air pressure is too high, turn the AITV clockwise in 1/2 turn increments
to close it, checking air and water pressure after each 1/2 turn.
If the air pressure is too low, turn the AITV counterclockwise 1/2 turn to open
it and check pressures. If the air pressure is still too low, open the valve
another 1/2 turn and check the pressures again.
Do not open the Air Inlet Trim Valve more than this. Use the PBTV if the
pressure remains too low.
6. If the air pressure remains too low, close the needle valve on the Piloted Balance
Trim Valve (PBTV) one full turn clockwise and check the pressure gauges.
Repeat closing the PBTV one full turn until the air pressure is equal to or up to
5% higher than the water pressure.
If the air pressure is too high after a full-turn of the PBTV, turn the Air Inlet Trim
Valve clockwise to lower the pressure until the air pressure is equal to or up to
5% higher than the water pressure.
7. Verify the Auto-Sync system settings by varying the fire pump discharge
pressure and monitoring the water and air pressure gauges. The air pressure
should rise and fall with the water pressure, matching it within 5%. Pressures
should match at static pressure only. It is normal for the pressures to be
unmatched when flowing water, air, or solution.
