Bradford-White Corp M1TW60T*F, M4TW60T*F, M2TW50T*F, M4TW50T*F, M2TW65T*F Pressure Switch Testing

Page 18

TTW SERVICE PROCEDURE III

Pressure Switch Testing and

Replacement

Pressure Switch Testing

Step 1. Position power switch on gas control to the “OFF” position.

WARNING

115 volt potential exposure. Use caution

making voltage checks to avoid personal injury.

Step 2. Remove the three screws (Phillips screw driver) from control access cover on blower assembly and remove cover (see photo 1).

Step 3. Carefully remove pressure switch from blower housing (see photo 2)

With steps 1,2 & 3

complete,

disconnect wire leads from

pressure switch.

Use a multi-meter set to the

 

 

 

 

 

ohms setting. With blower off,

 

 

 

 

 

check across pressure

 

N

 

 

 

switch terminals.

 

 

 

 

 

Are switch contacts open?

 

 

 

 

 

(no electrical continuity)

 

 

 

 

 

 

Y

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Position gas valve power

 

 

 

Y

switch to the “ON” position

 

 

 

 

 

 

 

 

and adjust thermostat

 

 

Check tubing and

to call for heat,

N

pressure tap on

this will start the blower.

 

 

switch for blockage.

Check with multi-meter, do

 

 

Is there blockage?

pressure switch contacts

 

 

 

 

 

close with blower running?

 

 

 

 

 

 

Y

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Switch contacts are OK.

 

 

 

 

 

See safety circuit trace

 

 

 

 

 

(page 29)

 

 

 

 

 

1

Pressure switch

wire leads

Check tubing and pressure tap on switch for blockage.

Is there blockage?

Y

Clear blockage

Y

Is vent

NN system

blocked

2

Pressure Switch

Slide pressure switch in direction of arrow while tilting slightly away from blower housing.

NReplace switch (see page 19)

Is vent system length

 

 

Y

 

See blower testing

within vent table

Y

(page 20)

specifications

 

 

Is blower OK?

listed on pages 7 & 8

 

 

 

N

 

 

 

N

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reconfigure vent

 

Correct blower

system to be

 

compliant with

 

problem.

vent tables.

 

 

 

Page 18

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Contents Service Manual Through-The-Wall Gas Water Heaters For Your Safety Introduction How to Use This Manual Specifications Vent Tables Vent Tables Control Timings Sequence of Operation Steady state operation Pressure Switch/Blower Temperature Fault Troubleshooting Eight-one flash, three Vapor Sensor Burner Inspection and Air Shutter Adjustment Burner Cleaning Pilot Inspection, Testing and Replacement Pressure Switch Testing Pressure Switch Replacement Blower Testing Pressure tapRemove exhaust Blower Temperature Switch Testing Blower Temperature Switch Replacement Gas Control Testing Thermal Well TestingDetermine Water Temperature Inside Tank Gas Control & Thermal Well Removal From Water Heater Gas Control Removal From Thermal WellGas Control Assembly to Thermal Well Flammable Vapor Device Testing Safety Circuit Voltage Trace Red wire leading to blower temperature NVAC Circuit Trace Dip Tube Inspection and Replacement Anode Inspection and Replacement Remove blower to gain access to system from exhaust Flue baffleInner Door Removal Procedure Inner Door Gasket Replacement ProcedureInstallation of Inner Door With Gasket Replace outer jacket burner access door ScreenLok Flame Arrestor Cleaning Glossary of Terms Parts List Parts@bradfordwhite.com Techserv@bradfordwhite.com

M4TW40T*F, M1TW50S*F, M2TW50T*F, M4TW50T*F, M4TW60T*F specifications

Bradford-White Corporation is a leading manufacturer of water heating and storage solutions, known for its commitment to quality and innovation. Among its impressive product lineup, the M2TW65T*F, TW465S65F, TW450S65F, M1TW40S*F, and M1TW60T*F models stand out for their reliability and advanced technology suitable for both residential and commercial applications.

The M2TW65T*F model is distinguished by its high efficiency and performance. It features a 65-gallon capacity, which is ideal for households that require a significant amount of hot water. This model is equipped with an innovative electronic ignition system that enhances energy efficiency while providing reliable hot water on demand. Additionally, it includes advanced insulation technology that minimizes heat loss, ensuring that water remains hot for extended periods.

The TW465S65F and TW450S65F are other exemplary models in the Bradford-White lineup, boasting impressive storage capabilities. Both models offer a combination of a 65-gallon tank and powerful burner systems that significantly reduce recovery time, meaning users can enjoy hot water faster. These models are designed with a user-friendly control panel, making adjustments and monitoring water temperature straightforward. Their robust construction ensures durability and longevity, making them a smart investment.

For smaller households or spaces, the M1TW40S*F and M1TW60T*F models provide excellent options without compromising performance. The M1TW40S*F, with a 40-gallon capacity, is specifically designed for efficiency in limited spaces, while the M1TW60T*F offers extra capacity for larger demands. Both models utilize Bradford-White's state-of-the-art gas burner technology, promoting energy conservation while delivering consistent hot water.

All models are built with a high-quality glass-lined tank to protect against corrosion, further enhancing their lifespan. The incorporation of Bradford-White's exclusive EverKlean technology in their tank designs minimizes sediment buildup, ensuring clean and efficient operation over time.

In addition to their standout performance and efficiency, Bradford-White products prioritize safety. Built-in safety features, such as the temperature and pressure relief valve and advanced venting designs, provide peace of mind for users. These models not only meet but often exceed industry standards for safety and efficiency.

Bradford-White's commitment to innovation and quality is reflected in the M2TW65T*F, TW465S65F, TW450S65F, M1TW40S*F, and M1TW60T*F models, making them excellent choices for anyone in need of reliable hot water solutions. With their advanced technologies, durability, and energy efficiency, these water heaters are ideal for diverse applications in modern homes and businesses.
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