4
Auto
Each system should be set to Auto once all the set points have been entered. This is the normal operating
position for the set and each display will show the system pressure for that system.
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 selector to the off
position and then back to auto. If the selector switch 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 that pump will run continuously regardless of system pressure.
This function is primarily intended to check pump rotation and pumps should not be left to run excessively.
If a pump is left to run in this position it will automatically be locked out after 18 minutes.
Exercise
This set point is adjustable between 0-30 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 selector switch in the off position press the up button to view pump1 run time press up button again
to enter reset mode, hold down both up & down buttons for 8 seconds and the display will zero. Repeat for
pump 2 using down button.
Note: Each display will show the hours that the pump has run for that system, this will need to be added to
the hours run of the opposite system to ascertain the total pump running time.
Commissioning valves
Commissioning valves have been provided to aid fault finding and checking that the system operates at the
correct values. The internal system isolation valve fitted on the unit discharge pipe can be turned off so the
unit is isolated from the system pressure. The small isolation valve can then be used to manipulate the
pressure within the unit to check that the pump cuts in and out as required. This valves can also be used to
dump water/pressure back to the break tank to enable the internal vessel pre-charge to be checked.
Remote inhibit
If the remote inhibit contacts have been activated then the display will show set inhibited, during this
condition no pumps are allowed to run irrespective of system pressure, however the system will still be
monitored for all conditions.
Run limit exceeded
If a pump is called to operate for periods in excess of 18 minutes or a combination of frequent starts both
pumps will be locked out and prevented from further operation. To reset the timer circuit switch the selector
switch to the off position and back to Auto again.
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 a low level float switch 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 as normal.
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