To multipurpose
sprinkler system
11
Softner/filter outlet
control valve
10
Water softener/
filtration system
9
Softener/filter inlet
control valve
8
PRV
Set PRV to
psi
per
design
4
Flow switch with gauge
assembly for potable
systems (optional)
5
Pressure gauge
At least one installed
downstream of the
pressure-reducing
valve (PRV)
6
PRV set pressure
This pressure requirement
is different on every project.
See design plans for actual
PRV set pressure.
13
Softener/filter outlet tee
7
To water heater
12
Softener/filter inlet tee
3
Tee to hard-water
fixtures
2
Main shutoff valve(s)
1
Main supply
• Water flows through
softener during normal
domestic use
• Pressure drop from
sprinkler operation
opens PRV
• Allows flow through PRV
• Flow switch can provide
alarm, if required
Figure 9-1: Domestic water bypass installation with optional flow switch
Installation guidelines
Refer to Figure 9-1 and use the following steps to install a
domestic water bypass.
1. Install the domestic water bypass line. There needs to be
a straight line from the main shutoff valve
1
to the PRV
4
and also from the PRV to the softener/filter outlet tee
7
.
This will ensure proper operation of the fire sprinkler system.
If additional 90-degree elbows are installed on the piping
through the PRV, contact Uponor Construction Services to
recalculate the system.
Visit:
uponor-usa.com/construction-services
Email:
U .S .
: 800.321.4739,
Canada
: 888.594.7726
52 l Uponor AquaSAFE System Installation Guide
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