TCA200 Rev171031
14
Pressure Mode Operation
In the pressure mode of operation the PRESSURE LED is on. The governor
maintains a constant discharge pressure within system capabilities. It adjusts the engine
RPM automatically to compensate for variations in pressure.
Note: When changing from RPM to pressure mode during operations, hold
the MODE button for 3 seconds. The pressure setting is the pressure that
the pump was operating at in RPM mode.
1. Press and hold MODE button for 3 seconds.
Result: PRESSURE LED goes on.
2. Press PRESET and/or the INC DEC buttons to select pressure setting.
Result: Message display shows pressure setting, engine RPM changes.
3. Press IDLE button after operations to bring engine to idle RPM.
Result: Message display shows IDLE, engine at idle RPM.
Opening/Closing Discharge Valves
In pressure mode the governor maintains the pressure setting regardless of the
number of discharge lines that are opened or closed providing there is a sufcient water
supplied. As lines are opened the discharge pressure starts to drop, and the governor
raises the engine RPM to maintain the required pressure. As lines are closed and the
discharge pressure starts to rise, the governor lowers the engine RPM to maintain the
required pressure.
Operating From a Pressurized Supply
When operating from a pressurized water source (hydrant, in-relay, etc.), the intake
supply should be routed through a valve. If the pressurized source fails, the pump
operator can close the valve. This eliminates the chance of sharp pressure spikes at
the pump intake if the supply is resumed suddenly. The operator must open this valve
slowly when the supply is resumed to help prevent pressure spikes.
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