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OPERATION
Adjusting Performance
Example
A home is supplied with pressurized water from the local municipality that fluctuates between 30 psi (2.1
bar) MAX and 25 psi (1.7 bar) MIN. The system adds 55 psi (3.8 bar) to the incoming water pressure.
•
MAX Total Downstream Pressure is 30 psi + 55 psi = 85 psi (2.1 bar + 3.8 bar = 5.9 bar)
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MIN Total Downstream Pressure is 25 psi + 55 psi = 80 psi (1.7 bar + 3.8 bar = 5.5 bar)
This condition will result in a pressure drop from 80 or 85 psi down to 40 psi before the pump initially turns
ON (this drop is due to the stored water being discharged from the pressure tank).
If the installer desires to change this from a 80 – 40 psi drop to a 80 – 50 psi drop, the discharge pressure
switch can be adjusted to turn the pump ON when the discharge pressure reaches 50 psi.
Follow these steps:
1.
Disconnect the unit from incoming power.
2. Remove the six control cap screws and the cap.
IMPORTANT: Be careful when removing the control cap, as there
is an electrical cable attached to the cap.
3. Using a 7/32" hex wrench, turn the internal discharge pressure
switch screw clockwise one full turn.
•
This should raise the switch cutoff by 10–12 psi (0.7-0.8 bar).
4. Replace the control cap and six control cap screws.
5. If desired, adjust the pressure tank pre-charge pressure to a max-
imum of 2 psi (0.1 bar) below the new outlet pressure switch set-
ting (48 psi (3.3 bar) in this example).
NOTE: Never adjust the discharge pressure switch to a setting higher than the sum of the minimum
incoming pressure + 40 psi. Doing so may result in a system fault.
6. Apply power.
Maximum Inlet Pressure
The maximum internal pressure rating of the unit is 100 psi (6.9 bar). Maximum inlet pressure when added
to the maximum pump pressure must not exceed 100 psi (6.9 bar).
•
The unit incorporates an internal pressure switch that will not allow the unit to turn ON if the inlet
pressure exceeds 40 psi (2.8 bar) either before or during desired operation.
•
Refer to
"Troubleshooting" on page
Example
If using this booster in an application with 45 psi (3.1 bar) incoming, it is recommended to install a pressure
reducing valve (PRV) on the inlet side of the unit. The PRV would be used to maintain a constant pressure
below the cut-in pressure and to limit the maximum pressure created.
Maximum Output Pressure
The unit maintains a "NO-FLOW" system pressure equal to the incoming pressure (psi/bar) plus the shut-off
pressure from the pump operating curve.
Example
If the input pressure is 38 psi (2.6 bar), at shut off the system will boost an additional 55 psi (3.8 bar). This
means all plumbing downstream of the unit would be subject to maintaining 93 psi (38 psi + 55 psi) or 6.4
bar (2.6 bar + 3.8 bar). If high pressure is undesirable due to the condition and/or configuration of the exist-
ing plumbing or appliances, install a PRV on the discharge of the unit to limit the maximum distributed
pressure.
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