15
psi (1.4 bar).
•
Before servicing, always disconnect power to the unit to avoid shock.
•
To adjust, remove cover and refer to the diagram inside the cover.
•
Turn adjustment nut #1 counterclockwise to decrease cut-out pressure and clockwise to
increase cut-out pressure. Under normal circumstances it is not necessary to adjust this
switch setting.
•
Replace cover and restore power to unit.
ALWAYS BE SURE TO CHECK THE CUT-OUT OPERATION AFTER ADJUSTMENT AS
OUTLINED IN §5.2.4 LOW PRESSURE SWITCH TEST.
§7.2 TANK PRESSURE SWITCH ADJUSTMENT
The tank pressure switch is factory set to turn the system off when the tank pressure reaches 60
psi (4.1 bar), called the cut-out setting. The system will then restart when the tank pressure drops
below 40 psi (2.8 bar), called the cut-in setting. The difference between the two is referred to as
the differential. The cut-in can be set as low as 5 psi (0.3 bar) and the cut-out can be set as high
as 65 psi (4.5 bar), however the differential range is limited to 10-30 psi (0.7-2.0 bar).
•
Before servicing, always disconnect power to the unit to avoid shock.
•
To adjust the differential, remove cover and refer to the diagram inside the cover. Turn
the nut #2 counterclockwise to decrease cut-in pressure (the cut-out is held constant).
This increases the differential. Turn clockwise to decrease the differential range.
•
Once the differential range is set, turn nut #1 clockwise to increase BOTH the cut-in and
cut-out pressures together (the differential is held constant). Turning the nut
counterclockwise decreases both together.
•
Replace cover and restore power to unit.
ALWAYS BE SURE TO CHECK THE CUT-OUT OPERATION AFTER ADJUSTMENT AS
OUTLINED IN §5.2.5 TANK PRESSURE SWITCH TEST.
§7.3 MEMBRANE REPLACEMENT (see Figure 4)
Nimbus recommends membrane replacement when the TDS rejection falls below 70%. A
properly maintained and operated system may possibly get 2+ years out of a membrane. Your
system may require more frequent membrane changes depending on your feed water.
•
Before servicing, always disconnect power to the unit to avoid shock.
•
Close feed water and tank valves.
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