Blocked Vent Pressure Switch Testing and

Replacement for serial number “CF” and later

Sequence of operation:

The blocked vent pressure switch monitors the pressure in the exhaust tube. The switch contacts are normally closed and will not open unless there is a blockage in the exhaust venting or terminal (snow, ice, debris). If the blocked vent pressure switch contacts open after the thermostat initiates the blower, the blower will remain on for to 5 minutes waiting for the contacts to close. If the contacts remain open, the blower will stop and the PURGE LED will flash for hot surface ignition models, or error code 29 will display for direct spark ignition models.

LED Status

 

Only power LED is on, or

 

Purge LED flashing.

 

Error Code 29 or 26

 

(Direct Spark Ignition

Safety Circuit Trace

Models)

WARNING

120 volt potential exposure. Use caution

making voltage checks to avoid personal injury.

 

 

Is there continuity

 

Does blower

N

Through GREY

Y

wire leads of heater side

 

energize?

 

 

 

safety circuit harness?

 

 

 

 

Y

 

(see photo below)

 

 

 

N

 

Call technical

support.

Depress reset

Nbutton on vent

safety switch. Is

Does heater

Y

there continuity

function?

 

 

across high limit

 

 

Is there continuity

through RED

wire leads of heater side safety circuit harness?

(see photo below)

Y

Check PURGE LED status

on ignition module,

Flashing after 45 seconds?

NSafety Circuit OK,

(see “Blower Testing

&Replacement”)

Replace exhaust

Ypressure switch (see

“Exhaust Pressure

Switch Replacement

Procedure”)

Yswitch?

(see photo below)

 

Verify proper

 

 

switch operation.

 

N

(see “Vent Safety

 

Replace vent safety

Switch Testing and

 

Replacement”)

switch.

 

 

(see “Vent Safety

Hot Surface Ignition Models:

 

Switch Replacement

Check PURGE LED status.

Procedure”)

Direct Spark Ignition Models:

 

 

Check control display

 

 

 

Control side

Heater side

harness

harness

On within 5 minutes?

Y

 

Pressure switch is OK.

 

 

N

 

 

 

Flashing after 5 minutes? N

 

Call for technical

Error code 29 again?

 

 

support.

Y

 

 

 

Check blower for proper

 

 

Correct blower problem

operation (see “Blower

 

N

 

(see “Blower Testing and

Testing and Replacement”)

Replacement”)

Is blower OK?

 

Y

 

Refer to

 

“Check Collector Pressure”

 

(see next page)

 

Note: HOT SURFACE IGNITION MODELS

ONLY - The blocked vent pressure switch must be used with the revised ignition control, identified with a yellow label.

Reset button

WARNING

Make sure exhaust collector compartment is not

overheating (350°F) before resetting vent safety

switch. If there is evidence the collector compartment

is overheating, CALL TECHNICAL SUPPORT.

57

57

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Image 57
Bradford-White Corp EF60T150(E)*(N Energize?, Switch operation, Direct Spark Ignition Models, Error code 29 again? Support

EFR160T120*(EN, EF100T250(E)*(N, EF100T399(E)*(N, EF100T300(E)*(N, EF60T125(E)*(N specifications

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