Watts LFDPTG-3 User Manual
For Hydronic Boiler & HVAC Applications
ES-LFDPTG-3
Job Name
Job Location
Engineer
Approval
LEAD FREE
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Series LFDPTG-3
Center Back Entry Combination
Pressure/Temperature Gauges
Dial Sizes: 21/2" and 3" (65 and 80mm)
Series LFDPTG-3 Combination Pressure and Temperature
Gauges are used in commercial, residential, and institutional
HVAC applications. These gauges are center back entry type
models with black enamel steel cases, Kostil Polymer windows,
1
/2" NPT connections, copper alloy Bourdon tube
pressure elements, and bimetal spiral springs. The LFDPTG-3
features Lead Free* construction to comply with Lead Free*
installation requirements. Accuracy is ASME, Type B. Series
LFDPG-5 gauges are available in various pressure rating scales.
The dual scale features PSI and kPa measurements.
Features
• Black enamel steel case
• Kostil polymer window
• Copper alloy Bourdon pressure element
• Bimetal spiral spring temperature element
• Tin alloy welding
1
•
/2" Lead Free Brass NPT connection
• ASME Type "B" accuracy
Contractor
Approval
Contractor’s P.O. No.
Representative
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3" (80 mm) LFDPTG3 21/2" (65 mm)
Dial Dial
Materials
Case: Black enamel steel
Window: Kostil polymer
Pressure Element: Copper alloy Bourdon tube
Temperature Element: Bimetal spiral spring
Welding: Tin alloy
Connector: Lead Free Brass
Models
LFDPTG-3- Center back entry
LFDPTG-3A - Center back entry with extended
LFDPTG-3L - Center back entry with extended mounting nut
temperature element
Approvals
Certified by The Northern Certification Society of Italy
(Det Norske Verita Italia S.r.l.)
Standards
ASME B40.100
Temperature
Working Temperature: 60°F – 320°F (20°C – 160°C)
* The wetted surface of this product contacted by consumable
water contains less than 0.25% of lead by weight.
Watts product specifications in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements,
please contact Watts Technical Service. Watts reserves the right to change or modify product design, construction, specifications, or materials without prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.
Dimensions – Weights
A
Center Back Mount
C
D
B
DPTG3
1
/2" – 14 NPT
1
/4" – 18 NPT
1
/2" DPG-VR retaining valve
included with gauge as indicated in table.
MODEL SCALE TEMP. RANGE INCLUDES VR SIZE DIMENSIONS WEIGHTS
RETAINING VALVE
A B C D
°F °C in. in. mm in. mm in. mm in. mm lbs. kgs.
LFDPTG3-21⁄2 0 – 50psi 340 kPa 60 – 320 15-160 Y
LFDPTG3-2
*
LFDPTG3-2
LFDPTG3-2
1
⁄2 0 – 75psi 520 kPa 60 – 320 15-160 Y
1
⁄2 0 – 200psi 1379 kPa 60 – 320 15-160 Y
1
⁄2 0 – 75psi 520 kPa 60 – 320 15-160 N
LFDPTG3-3 0 – 50psi 340 kPa 60 – 320 15-160 Y
LFDPTG3-3 0 – 200psi 1379 kPa 60 – 320 15-160 Y
LFDPTG3A-2
LFDPTG3A-3 0 – 75psi 520 kPa 60 – 320 15-160 N
LEAD FREE
LFDPTG3L-2
1
⁄2 0 – 75psi 520 kPa 60 – 320 15-160 N
1
⁄2 0 – 75psi 520 kPa 60 – 320 15-160 N
LFDPTG3L-3 0 – 75psi 520 kPa 60 – 320 15-160 N
1
⁄2 21⁄2 64 1 25 115⁄16 49 7⁄8 23 .5 13
1
⁄2 21⁄2 64 1 25 115⁄16 49 7⁄8 23 .5 13
1
⁄2 21⁄2 64 1 25 115⁄16 49 7⁄8 23 .5 13
1
⁄4 21⁄2 64 1 25 115⁄16 49 7⁄8 23 .5 13
1
⁄2 3 76 1 25 115⁄16 49 7⁄8 23 .5 13
1
⁄2 3 76 1 25 115⁄16 49 7⁄8 23 .5 13
1
⁄4 21⁄2 64 1 25 115⁄16 49 2 51 .5 13
1
⁄4 3 76 1 25 115⁄16 49 2 51 .5 13
1
⁄4 21⁄2 64 2 51 315⁄16 100 1 25 .5 13
1
⁄4 3 76 2 51 315⁄16 100 1 25 .5 13
A Watts Water Technologies Company
USA: Tel: (978) 688-1811 • Fax: (978) 794-1848 • www.watts.com
Canada: Tel: (905) 332-4090 • Fax: (905) 332-7068 • www.watts.ca
ES-LFDPTG-3 1329 © 2013 Watts
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