Watts P3 User Manual
Job Name Contractor
USA: 815 Chestnut St., No. Andover, MA 01845-6098; www.wattsreg.com
Canada: 5435 North Service Rd., Burlington, ONT. L7L 5H7; www.wattscda.com
Job Location Approval
Engineer Contractor’s P.O. No.
Approval Representative
W atts P3
Multi-Orifice Flow Control
for Tankless Heaters
Adjusts to 3, 31⁄2 or 4 gpm
Watts No. P3 Flow Control valve is designed to limit the flow of water
to equipment and is used for tankless heater installations. It features a
multi-orifice design which lets you select a flow of 3, 3
simply and quickly, by turning the cap to the desired setting. If a different setting is desired, simply move the adjusting cap to the desired
setting, locating this over the matching line on the body.
Capacity
Watts No. P3 Flow Control is designed to give the rated capacity in
gallons per minute as numbered on the adjustment cap at 50 psig
supply pressure. For other pressures, refer to the Flow Table for corresponding adjustment setting. It is recommended that supply pressure
be determined with a gauge to assure accurate flow. For example, 80
psi supply pressure results in the following:
Adjustment Setting No. Flow gpm @ 80 psi
3 3.8
1
⁄2 4.4
3
4 5.1
1
⁄2 or 4 gpm,
WATTS No. P3 No. Andover, MA
21⁄233
▼
Vertical marker line just to left of 3 gpm marker line signifies minimum adjustable volume (approx. 2
supply pressures exceed 50 psi.
1
⁄24
ES-P3
Multi-Orifice cylinder
adjusts to
1
⁄2 or 4 gpm.
3, 3
gpm
@
50 psi
1
⁄2 gpm) when
Installation
Watts No. 174A
Hot
Watts P3
C
Dimensions
5
⁄8"
Hot to
Appliances
Watts 1170
Tempering
Valve
Cold
1
⁄2" 2" 6 ozs.
Hot Water
Boiler
Tankless Heater
Watts 3L
Pressure
Relief
Dimensions
A
B
Model Size A B C Weight
P3
1
⁄2"1
Tempered
Flow Table (gpm)
Adjustment
Supply Setting No.
Pressure psi 3 31⁄2 4
30 2.3 2.7 3.1
40 2.7 3.1 3.6
*50 3 3.5 4
60 3.3 3.8 4.4
70 3.5 4.1 4.7
80 3.8 4.4 5.1
90 4 4.7 5.3
100 4.2 4.9 5.6
110 4.5 5.2 5.9
120 4.6 5.4 6.2
130 4.8 5.6 6.4
140 5 5.8 6.7
150 5.2 6.1 6.9
*Adjustment Cap Settings
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