Pneumax 120-60-DS, Руководство по установке, Страница: 25 / 40

Pneumax CAFS "DS" Series Installation Guide
Page 25 of 40
5. Verify that the fixed regulator is performing properly by varying the engine speed as you
watch the air pressure gauge. The pressure should remain steady at the setting you
made. Repeat steps 2 through 4 if needed.
Turn the control to UNLOAD and back to RUN (To UNLOAD and back to FIXED for
electric valves). The air pressure should rise to the fixed pressure. It may overshoot
and drop back to the target pressure, but that is normal.
After the FIXED mode is adjusted, proceed to AUTO mode adjustment.
3. AUTO Mode Adjustment
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 at the main discharge, with minimal
flow.
2. Place the controls on the Auto Sync control panel to AUTO and RUN. (AUTO for electric
valves.)
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 Air Inlet Trim Valve 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 Air Inlet Trim Valve 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.