INSTRUCTION MANUAL HS-253

REVISION BHoffman Speciality

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Series TD6420 Thermodisc Trap Capacities (Gross Ratings)

WeightSize (Approx.)

Model in. A (W) B (H) C (L) lbs. (kg)

TD6423 3⁄8 111⁄16 (43) 41⁄4 (108) 31⁄16 (78) 2.4 (1.1)

TD6424 1⁄2 111⁄16 (43) 41⁄4 (108) 31⁄16 (78) 2.4 (1.1)

TD6426 3⁄4 111⁄16 (43) 41⁄4 (108) 31⁄16 (78) 2.7 (1.2)

TD6428 1 111⁄16 (43) 45⁄8 (117) 31⁄4 (82) 3.3 (1.5)

Dimensions in. (mm)

AC

B

Sizein.

Pressure Differential in Pounds Per Square Inch (bar)

Capacities in Pounds Per Hour (kg/hr) -10˚F Below Saturation

3/8 315 370 425 520 575 800 900 1080 1280 1380 1480 1650(143) (168) (193) (236) (261) (363) (408) (490) (581) (626) (671) (748)

1/2 315 370 425 520 575 800 900 1080 1280 1380 1480 1650(143) (168) (193) (236) (261) (363) (408) (490) (581) (626) (671) (748)

3/4650 740 800 1000 1100 1400 1540 1630 1760 1930 2070 2200

(295) (336) (363) (454) (499) (635) (699) (739) (798) (875) (939) (998)

1 650 740 800 1000 1100 1400 1540 1630 1760 1930 2070 2200(295) (336) (363) (454) (499) (635) (699) (739) (798) (875) (939) (998)

Model10 25 50 75 100 150 200 250 300 400 500 600

(0.69) (1.7) (3.5) (5.2) (6.9) (10.4) (13.8) (17.3) (20.7) (27.6) (34.5) (41.4)

TD6423

TD6424

TD6426

TD6428

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Piping upstream and downstream of the trapshould be at least equal to or one pipe sizelarger than trap connection.

Install separate traps on each piece of equip-ment to be drained. Pitch all apparatus drainlines towards the trap.

Locate the trap below the condensate outlet byinstalling pipe (A). Install a tee fitting (B) with adirt pocket (C) to collect dirt and scale.Connect the side outlet of the tee to a GateValve (D).

Blow down piping with steam or air to removedirt scale.

When the piping is cleaned install the trap (E).Install a blow-down valve (F) on the trap strainerscreen pocket. Install an outlet pipe (G) with aunion (H) from the outlet trap.

Connect the trap discharge to the return line.A shut-off valve (J) should be installed to isolatethe trap from the return line to allow servicingthe trap.

INSTALLATION –

Locate the trap where it will be accessible for maintenance and inspection. Position the trap below theequipment to be drained.

The preferred installation is when the trap is installed in a horizontal pipe with the service cap on top.

If freeze protection is required locate the trap in a vertical pipe with the outlet pointing down, the outletmust be pitched to a vented return to assure complete condensate removal.

Make sure the trap is correctly sized for peak load demands.

A

B

C

H

D

F

EJG

D

G

J

EF

H

Standard Horizontal Installation Detail

Alternate Freeze Proof Installation

To prevent serious personal injury from steam pipeblow down, connect a temporary pipe between thesteam pipe opening and a drain, or stand at least100 ft. (30m) from the front of the pipe opening.

CAUTION!

Xylem Inc.

8200 N. Austin Avenue Morton Grove, Illinois 60053 Phone: (847) 966-3700 Fax: (847) 965-8379www.xyleminc.com/brands/hoffmanspecialty

© 2012 Xylem Inc. HS-253B April 2012 Part No. 510075

Hoffman Speciality