Service Procedure PDV23-II

Pressure Switch Testing

DANGER

120 volt exposure. To avoid personal injury, use caution while performing this procedure.

CAUTION

Be Careful When Making Voltage

Measurements or Jumping Terminals Not to Damage or Deform Connectors or Connector Pins.

Condition: Blower operates, burners not lit.

Display shows error code “29” (Pressure Switch

Failed to Close).

Connect a digital manometer to the tubing for the pressure switches and determine the average reading. See table at right for pressure switch settings and minimum readings required. Is the pressure switch reading at least 0.20" above the switch reading for the model tested (see chart at right)?

Check intake and exhaust vent terminals outside the building. Is there any blockage from debris (leaves, ice, snow, paper, etc.). If so, clear intake or exhaust vent terminals. Pressure switch should close and the burners should fire.

Check the total equivalent vent length by adding up the total number of elbows and the straight lengths of vent pipe for the intake and exhaust pipe (or coaxial vent pipe for PDV-T model series). See table at right for maximum distances. If the venting distance is excessive, reduce the number of elbows or route the vent terminals to a shorter distance outside the building.

If the venting system and vent terminals are O.K., but the pressure switch reading is still low, check the pressure switch tubing to make sure there are no small holes or kinks. Make sure there are no drops of condensate in the tubing. Check the pressure switch tubing connection fitting and pressure tap to make sure it is not clogged with dirt. Blow through tubing to verify that the pressure taps and tubing are clear and not leaking.

PDV-S MODELS: Check the vent safety thermal switch near the outlet of the blower (see photo at right). Press the red reset button. (See photo on next page). If you feel a slight click, the temperature was excessive and the switch opened. Check to be sure the burner access screws are tight and the gasket is in good condition (see section on servicing the burners)

If the pressure switch readings are at least 0.20" w.c. above the above pressure switch settings for the installed model and the switch does not close, then replace the pressure switch with the same setpoint.

Minimum Differential Dual Tap Pressure Switch Settings:

	(Contacts open)
PDV80S,100S-150 models:	-2.00" w.c.
PDV80S,100S-200 models:	-1.20" w.c.
PDV80S,100S-250 models:	-2.00" w.c.
PDV80T300 models:	-1.20" w.c.
PDV100T360 models:	-0.60" w.c.

Note: During normal hot running conditions, the pressure switch readings should be at least 0.20" higher than the above readings where the pressure switch will open.

PDV80,100S-150,200 Models with 3" PVC vent: Maximum Distance of 40 feet with one 90 deg. elbow for intake or exhaust (subtract 5 feet for each additional elbow).

For venting with 4" PVC vent: Maximum distance of 55 feet with one 90 deg. elbow for intake or exhaust (subtract 5 feet for each additional elbow).

PDV80S,100S-250 Models with 4" PVC vent: Maximum distance of 55 feet with one 90 deg. elbow for intake or

exhaust (subtract 5 feet for each additional elbow).

PDV80T300, PDV100T360 Models with coaxial venting system: Maximum venting distance of 19 feet 6 inches with one 90 deg. elbow. Each additional elbow reduces

the venting distance by 39".

See installation instruction manuals supplied with the water heater for further details on proper venting installations.

Checking pressure switch contacts.

Contacts are open if blower is

operating and there is 22-26 volts measured between the two contacts (as in photos)

PDV80T300, PDV100S150, PDV100T360, PDV80S150, D65T625 specifications

Bradford-White Corporation is renowned for its quality water heating solutions, with a diverse range of products designed to meet various residential and commercial needs. Among their stellar offerings are the D80T725, PDV100S200, PDV100S250, PDV80S250, and PDV802200 models, each equipped with advanced technologies and features that set them apart in the market.

The D80T725 is an innovative 80-gallon water heater that employs a powerful 75,000 BTU burner, ensuring rapid water heating for larger households. One of its key features is the Defender Safety System, which provides exceptional protection against potential hazards. The advanced electronic control system enhances efficiency and reliability, making it an ideal choice for energy-conscious consumers. Additionally, the tank's unique insulation helps maintain water temperature longer, reducing energy costs.

Moving to the PDV series, the PDV100S200 and PDV100S250 are dynamic, direct vent gas water heaters with capacities of 100 gallons and impressive BTU inputs. These models utilize a proper venting system that draws air from outside, ensuring that indoor air quality remains uncompromised. Both models feature Bradford-White's patented hydrojet total performance system, improving heat transfer by minimizing sediment buildup. This technology prolongs the lifespan of the unit while maximizing energy efficiency.

The PDV80S250, like its PDV counterparts, also utilizes direct venting technology for enhanced safety and efficiency. With an 80-gallon capacity and a robust 250,000 BTU input, this model is designed for businesses and larger households requiring significant hot water availability. The use of cutting-edge insulation technology in these models reduces standby heat loss, which translates to substantial savings on energy bills.

Lastly, the PDV802200 stands out with similar advanced features but offers a higher capacity of 80 gallons, making it a perfect solution for commercial applications. It strikes a balance between performance and reliability, ensuring consistent hot water delivery even during peak demand. The integration of robust safety features and user-friendly controls make it easy for facility managers to operate and maintain.

In summary, whether you opt for the D80T725 or one of the PDV models, you can expect a blend of performance, efficiency, and advanced technology. Bradford-White's commitment to quality and innovation ensures that each product meets the demands of modern consumers, making them a leading choice in the water heating industry.