PSI is the default setting if programmed for ‘SENSOR’. Press ENTER when finished.
OR
PRE-DWELL TIME: This is a delay time used to build system pressure in orchestration with the
pressure sustaining master valve, in order to ensure valves open and close on systems with smaller
pumps. Press SELECT, +, and - to set the delay time (up to 255 seconds) before the unit goes into
backwash mode.
BACKWASH TIME: This sets the cleaning duration for each filter tank. Press SELECT, +, and - to set
the delay time (up to 255 seconds) per tank. Press ENTER when finished.
DWELL TIME: This sets idling time between tank backwashes in order to maintain system pressure,
and allow valves enough time to open and close as backwashing progresses. Press SELECT, +, and
- to set the delay time (up to 99 seconds). Press ENTER when finished.
PERIODIC TIME: This sets backwashing cycle intervals. It is independent from the PD gauge
initiation; however, if the gauge triggers a backwash cycle before a periodic interval initiates, the
periodic’s interval time clock will reset to zero, and begin timing up again. After a cycle is complete,
the controller reverts back into filtering mode, the periodic time resets to zero, and periodic timing
begins again.
PD DELAY TIME: Intermittent surge pressures in a filter system can occur which could trigger a
backwash cycle unnecessarily. Adding PD delay time alleviates unnessessary backwashing, and
allows ‘gauge bouncing’ to stabilize before a legitimate pressure reading is taken. Press SELECT, +,
and - to set the delay time (up to 255 seconds). Contact filter manufacturer for correct setting.
TANK ASSIGN: Depending on how many filter tanks there are, you can activate/deactivate any of
them --up to four. Press select, and move along to each tank number, then use “+” or “-” to activate or
deactivate that tank; when finished, press enter.
BACKWASH TANK SEQUENCE: There are two orders for backwashing --Sequential and
Progressive. Sequential backwashing traditionally starts with Tank 1, 2 ...4 in order every time a new
cycle starts. Progressive backwashing starts by cleaning a different tank every time a new cycle starts
i.e. 1,2,3,4 then 2,3,4,1 then 3,4,1,2, etc, etc. This can be used to help all tanks clean evenly and
keep water flow consistent through all tanks while filtering.
BACKWASH CYCLE COUNT: This function displays how many backwashes have occurred since it
was last cleared. To reset the count to zero, press select, then select over to ‘Y’, and press enter.
SOLENOID TYPE: The FM-4P is compatible to 24VAC and 12VDC non-latching, and 12VDC latching
solenoids. Default solenoid setting is in the NON-LATCHING mode. To change to Latching (12VDC
only), press select twice, and press enter. You must also set the output switch (located on rear panel)
to the correct configuration. Your options are as follows: For 120/240VAC power supply input, the
output switch can be set for 24VAC or 12VDC solenoids. For 12VDC power supply input whether
from a genset or solar panel set up.
SENSOR/GAUGE TYPE: To switch between the traditional Murphy switch gauge and the Alex-Tronix
Sensor, select to either one, and press enter.
SENSOR SET
POINT: 07:0 PSI SET DIFFERENTIAL
PSI ON GAUGE
