Operation
Ensure the power switch on the front panel is in the on position.
The digital display will now go through the starting check sequence, after about 8 seconds the display will show
system pressure. Press the mode button until Auto shows then press select and Auto mode will be set.
If the system pressure is lower than the fill pressure then a pump will run and start to raise the system
pressure. Once the system pressure is restored the pump will stop.
If the pressure in the system falls to the duty pump cut in point the duty pump will start, once the system pressure
has been restored the duty pump will stop. Each time the pressure falls the alternate pump (on two pump units) will
start and restore system pressure. If the duty pump after running for 2 seconds has not succeeded in
raising the pressure and it continues to fall by 0.2 bar it will be deemed that the duty pump has failed.
4
Off
The off position performs two functions, if the main pump has failed and the duty standby pump has been activated,
the duty pump will be locked out until the system is reset by switching the mode button to the off position and then
press select button to select off then switch mode button back to Auto select and the unit will revert to auto opera-
tion. If the mode button is left in the off position no pumps will be able to run but the system will still be monitored for
all other conditions I.E. low/high pressure.
P1/P2 hand positions
If either pump one or pump two is selected for hand operation, that pump will run for 10 seconds regardless of
system pressure. And then switch off.
This function is primarily intended to check that the pump is operational.
Note: After hand operation has been selected the mode will revert to off so the Auto mode will need re-selecting.
Exercise
This set point is adjustable between 0-28 days and is used to run the pumps for a short period after the set time has
elapsed, running the pumps at regular intervals helps prevent pumps from seizing due to inactivity.
V/Free contacts
See appropriate drawing for Volt free contact availability. Rating 1A 50v maximum.
Features
Hours Run
With the mode switch scroll through until P1 hours run is shown or P2 and the run hours will be displayed.
If the display is flashing the hours run can be set back to zero by pressing and holding both the up and down buttons
for 8 second.
Run limit exceeded
If a pump is called to operate for periods in excess of the time set in Run Limit menu or a combination of frequent
starts both pumps will be locked out and prevented from further operation. To reset the timer circuit the mode button
can be pressed and OFF can be selected, press mode button again and select Auto and the system will be reset
and the unit will operate normally.
Transducer failure
If the transducer fails the display will read Sensor error and prevent pump operation, the high low pressure contacts
will simultaneously operate to indicate that a failure has occurred and switch off the boiler circuit.
Break tank low water level
The break tank contains low level probes which will stop all pumps from operating whilst the water level is low. Once
the water level rises to the reset position the pumps will be released to operate after a 20 second delay.
Boiler/chiller interlock
A volt free normally closed circuit is provided as a boiler/chiller interlock. The circuit has 1 high pressure contact and
1 low pressure contact either of which, when operating, will open the boiler/chiller circuit. If the high pressure contact
is not required with chiller applications it can be omitted. See product wiring drawing.
This circuit is failsafe so if the power supply is turned off the circuit will open and the low and high volt free
contacts will operate simultaneously to indicate that the power has failed.
O&M Micro Presfix_Layout 1 29/03/2017 11:15 Page 4
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