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Typical Pressure Booster System
Water Out
to Household
Low Pressure
Cutoff Switch
Tee
Relief
Pressure
Valve
Switch
Figure 6:
Model SNCP42
Gate Valve
and Union
for Service
Access
Pressure
Switch
Pressure
Gauge
Low
Pressure
Cutoff
Switch
Tee
Water Out to
Relief
Household
Valve
Figure 7: Model SNCP15
User Supplied Components:
Low Pressure Cutoff
Switch (1)
Check Valves (2)
Gate Valves (2)
Relief Valve (1)
Gate Valve
Pressure
and Union
Gauge
for Service
Access
Check
Valves
City Water
Flow In
Union and
Gate Valve
for Service
Access
2882 0198
Gate Valve
and Union
for Service
Access
City Water
Flow In
Check
Valves
2887 0198
Pressure Gauge (1)
Unions (3)
Elbow (1)
Tees (2)
Piping
INSTALLATION
Hazardous pressure. Install a relief valve as
shown capable of passing entire pump flow at 75 PSI.
Pump body may explode if internal pressure exceeds 75
PSI.
Never run pump against closed discharge.
To do so can boil water inside pump, causing hazard-
ous pressure in unit, risk of explosion and possibly
scalding persons handling pump.
NOTICE: The incoming flow rate must equal or exceed
the minimum pump flow requirement of 6 Gallons per
Minute or the pump will fail. As a rule, the pump will
not increase the flow rate in the system.
A low pressure safety cutoff switch is recommended to
shut off power to the pump in case of low discharge
pressure caused by plugged nozzle, interruption to the
incoming water supply, etc.
For pressure switch adjustment instructions, refer to the
label inside the cover of the pressure switch.
The system can be located indoors or outdoors. Make
sure that the site is level, solid, well drained, and pro-
tected from the weather and from freezing.
1. Turn off city water to house.
2. Install pipe as shown (Figures 6 & 7). Be sure to
include unions and stop valves so pressure booster
unit can be removed for service without interrupting
household water supply. A spring loaded check valve
ahead of the booster system and a low pressure cutoff
switch after it are recommended (You may wish to
replace the standard pressure switch with a pressure
switch that includes a low pressure cutoff).
3. Use PTFE pipe thread sealant tape on all piping joints
to prevent leaks.
Please go to Pages 8 and 9 for electrical hookup.
Table I: Pressure Switch Setting for Booster System
If Minimum
Incoming System
Pressure Switch
Pressure Is:
Rated At:
20/40; set cut-in
Below 20 PSI
to 20 PSI
30/50; set cut-in
20-30 PSI
to 30 PSI
40/60; set cut-in
30-40 PSI
to 40 PSI
Use
Set
Tank
Precharge at:
18 PSI
28 PSI
38 PSI
7
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