Bradford-White Corp 500-1825 Manual De Usuario

Internet Version for Reference Only

Page 14

B4 Volume Water Heater

Page 15

See Figure 15 for control locations.

        3.1.1        Electronic Ignition Controls:
         a.     Intermittent Ignition:
                 Pilots are automatically lit when the 

operating aquastat calls for heat (System 

#9).

                 The unit performs its own safety check and 

opens the main valves only after the pilot is 

proven to be lit. Whenever the pilot flame 

is interrupted, the main gas valve closes 

within 0.8 seconds.

         b.     Electronically Supervised Standing Pilot 

System (System #16):

                 When pilot flame fails, the ignition control 

module responds in less than 0.8 seconds 

and provides 100% safety shutdown.

         Electrically Operating Controls:
         Copper Brute units are equipped with operating 

temperature. The temperature sensing bulb is 

located in the heater inlet.

        

         The manual reset high limit switches are 

provided as standard equipment on all heaters. 

Automatic reset switches are optionally provided. 

The temperature sensing bulb of the switch is 

always located in the heater outlet. Burners will 

automatically shut down whenever overheating 

of water occurs.

Flow Switch:

         Standard on all models, the switch is mounted 

directly in the header outlet. The flow switch 

shuts down all burners in case of low water 

condition or pump failure.

         The low water cut off automatically shuts off  the 

heater whenever the water level drops below the 

probe. The probe is located at the heater inlet.

Before placing the heater in operation, be certain 

that the heater is filled with water and all air is purged 

from the system. Once the heater is connected to the 

gas supply, the automatic safety shutoff devices must 

be checked.

1.      Before beginning the tests, make sure the main 

manual gas valve, and any other heater firing 

valves are in the “OFF” position.

Rating Plate

Ignition Control

Pressure Relief

Valve

Flow Switch

In

Out

Transformer

Terminal Strip

Operating Control

(Aquastat)

Hi-Limit

Operating

Gas Valve

Manual

Pilot

Valve

Manual

Main Gas

Valve

Safety

Gas

Valve