TGA100 Rev0106
14
Pressure Mode Operation
In the pressure mode of operation the PSI LED will be on. The INControl will
maintain a constant discharge pressure. It will adjust the engine RPM automatically to
compensate for variations in pressure.
Note: When changing from RPM mode to pressure mode the pressure setting
will be the pressure that the pump was operating at in RPM mode.
1. Press and hold
PSI
mode button for 3 seconds.
Result: PSI LED goes on.
2. Press
PRESET
and/or
INC/DEC
button to select the operating discharge
pressure.
3. Press
IDLE
button after operations to bring engine to idle RPM.
Result: Display shows
IdLE.
Switching Supply Water
When switching the water supply source from tank to hydrant, draft to hydrant, or
draft to relay, water flow through the pump can become turbulent and the positive
pressure from these sources may generate a sudden pressure surge. It is recommended
that the INControl be set in RPM mode before changing the water supply source.
No or Low Supply Water
There are situations during pump operations when there may be no or low supply
water. This can be due to an empty water tank, a problem on the intake line, or when
switching the water supply source.
In pressure mode the INControl will increase the engine RPM and attempt to
maintain the selected pressure setting. If the discharge pressure drops below 45 PSI
but stays above 15 PSI the INControl will go into a low water cycle. It will set the
engine to 1100 RPM, if the pressure does not rise above 45 PSI in 7 seconds the
INControl will set the engine at idle RPM. The INControl will repeat the low water
cycle as long as the discharge pressure is between 15 and 45 PSI.
If during the prime cycle the discharge pressure drops below 15 PSI the engine
will be set at idle RPM. When the discharge pressure rises above 45 PSI the INControl
will resume normal operation.
Opening/Closing Discharge Valves
In pressure mode the INControl will maintain the pressure setting regardless of
the number of discharge lines that are opened or closed providing there is a sufficient
water supply. As lines are opened the discharge pressure will start to drop and the
INControl will raise the engine RPM to maintain the required pressure. As lines are
closed the discharge pressure will start to rise and the INControl will lower the engine
RPM to maintain the required pressure.
