Bradford-White Corp 500-1825 Manual De Usuario

Internet Version for Reference Only

Page 16

B4 Volume Water Heater

Page 17

Black carbon or green soot on a dirty heat 

exchanger can, under certain conditions, be 

ignited by a random spark or open flame. To 

prevent this unlikely occurrence, dampen the 

soot deposits with wet brush or fine water 

spray before servicing or cleaning the heat 

exchanger.

         With a wire brush, remove soot and loose scale 

from heat exchanger. Clean fallen debris from 

bottom of heater. Make sure burner ports are 

clear and pilot assembly is free of debris.

         d.     Reassemble in reverse order: Be sure the 

heat exchanger baffles are replaced.

8.      The gas and electric controls installed on heaters 

are engineered for both dependable operation 

and long life, but the safety of this equipment 

completely depends on their proper functioning. 

It is strongly recommended that the basic items 

be checked by a competent serviceman every 

year and replaced when necessary. The basic 

controls are:

         a.     Water temperature controls.

         b.     Pilot safety system.

         c.     Automatic electric gas valve(s).

         d.     Flow sensing safety device.

9.      Low water cutoffs should be inspected every six 

(6) months, including flushing of float types.

NOTE: Warranty does not cover any damage 

caused by lack of required maintenance or improper 

operating practices.

10.    Both modulating and stage valve are adjusted at 

the factory for minimum permissible rates and 

should not be readjusted.

1.      For proper service and problem diagnosis of the 

heater and heater system, the following tools are 

required:

         a.     Gas pressure test kit with range from zero 

to 14 W.C. Either a slack tub manometer or 

an accurate gas pressure gauge is acceptable 

with proper adapters which will connect to 

the available fittings in the line and on the 

gas valve.

         b.     Multi-meter with the following ranges:

                 0 to 500 volts A.C.

                 0 to 1000 ohms continuity.

         c.     Tube cleaning kit consisting of reamer, 

stainless steel brush, speed handle and 

handle extensions.

         d.     Heater thermometer (with 1/2" NPT well) 

100-240°F.

2.      In addition, the heater should be equipped with 

a system pressure gauge with proper ranges for 

heater operation.

 A.  Electric power is off                   A. Check to see that main power  

                                                             switch is “ON.” Use testing  

                                                             device to trace power to  

                                                             heater junction box.

 B. Operating or safety control         B. Turn off power. Use continuity

     has opened circuit to electric          across terminals of each  

     gas valve.                                       operating and safety control

                                                             switch up to the electric gas

                                                             valve. Replace effective

                                                             control.

 C.Pilot flame is out.                        C.Relight pilot per instruction.

 D.Manual reset device has             D.Follow instructions for start-

     tripped.                                            up. Reset Pilot safety and all

                                                             manual reset safety switches  

                                                             and reset manual safety gas  

                                                             valve.

 E. No gas pressure to burners.       E. Trace gas line to service  

                                                             shutoff cock. If service cock is  

                                                             open, trace gas line to meter.  

                                                             If no pressure is present at  

                                                             meter, call for public utility  

                                                             service. If gas is present in  

                                                             heater inlet, check pressures  

                                                             in following sequence:  

                                                             (1) downstream from pressure  

                                                             regulator. (2) downstream  

                                                             from electric gas valve.  

                                                             Replace or adjust as    

                                                             necessary.

 F. Electric gas valve operator is      F. Disconnect wiring harness at  

     burned out or shortened.                gas valve terminals. Check  

                                                             continuity to actuator coil. If  

                                                             open circuit or short is