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INLET

TEST

INLET

OUTLET

OUTLET

TEST

OUTLET

INLET

TEST

INLET

OUTLET

TEST

T

2

1. Determine where to install the trap, based on the 

following requirements:

• The trap must be located as close as possible to, and 

below the equipment to be drained.

• The trap must be in a straight run of horizontal pipe as

shown in the “Typical Piping Diagrams,” and pitched to
allow condensate to flow into trap inlet, and away from 
trap outlet.

• Allow for enough space around the trap for servicing, 

which may include removal of the body or cover, 
depending on the model you are installing.

The Hoffman Series H traps provide an additional opening
where a test valve may be installed. On traps that do not
have an additional opening, the test valve can be installed
in a tee fitting in the discharge line.

OPERATION

Float and thermostatic traps have two basic elements: a
thermostat for venting air from the system during start-up
and a float assembly for draining condensate.

The thermostat is normally open. It allows air to vent until it
is within 10-30°F (4-12°C) of the steam temperature.

The float assembly drains condensate from the system
when buoyancy force lifts the float ball and opens the
valve. The weight of the float ball causes the pin to close
against the trap seat when condensate is not present.

Materials of Construction

Part

Specifications

Body and Cover

Cast Iron 30,000 psi tensile

Valve Pin and Seat

Stainless Steel (Hardened)

Float

Stainless Steel

Lever Assembly

Stainless Steel

Thermostatic Air Vent

Stainless Steel Cage and
Thermal Element

Cover Bolts

Grade 5

Baffle

Stainless Steel {2

1

/

2

” units only}

To prevent serious personal injury from steam
pipe blow down, connect a temporary pipe
between the steam pipe opening and a drain,
or stand at least 100 ft. (30m) from the pipe
opening.

Failure to follow this warning could cause
property damage, personal injury, or death.

!

WARNING

INSTALLATION –

Series H, C and X Float and
Thermostatic Steam Traps

STEP 1

Summary of Contents for Bell & Gossett C Series

Page 1: ...INSTRUCTION MANUAL HS 222G 510837...

Page 2: ...om the system during start up and a float assembly for draining condensate The thermostat is normally open It allows air to vent until it is within 10 30 F 4 12 C of the steam temperature The float as...

Page 3: ...d the outlet pipe This allows the trap to be isolated when servicing Install a test valve in the outlet pipe and cap it This allows the trap to be tested The cap is used as safety precaution when the...

Page 4: ...assembly removed from trap cover remove pin that holds lever assembly to yoke Inspect seat and pin for wear replace if worn 5 Inspect thermostatic element by placing it in boiling water to see if it c...

Page 5: ...2 Standard Capacity Pin Seat Bracket E Ring Seat Yoke Pins Seat Bracket E Ring Seat Yoke Series X Trap Seat and Yoke 2 Series C Seat and Yoke 21 2 Units Internal Component Detail Illustration Cover Bo...

Page 6: ...failed open b Cause Float assembly failed open and allowed live steam to blow through the trap Test Install a test valve in the discharge line from the trap outlet Observe the trap operation for stea...

Page 7: ...t alteration accident or physical damage c used in a manner contrary to Seller s instructions for installation operation and maintenance d damaged from ordinary wear and tear corrosion or chemical att...

Page 8: ...tion and maintenance d damaged from ordinary wear and tear corrosion or chemical attack e damaged due to abnormal conditions vibration failure to properly prime or operation without ow f damaged due t...

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