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Page 22

Copper Brute B4 Volume Water Heaters

Page 23

After running the heater for a long enough 

period, bring the water temperature within the range of 

the hi-limit switch and slowly back off the high limit 

setting until the heater shuts off. The main burners 

should reignite when the hi-limit switch is reset and 

turned back up to its original setting. The heater should 

now run until it shuts off automatically on operating 

control.

Should overheating occur or the gas supply fail 

to shut off, turn off the manual gas control valve to the 

heater.

Shut down the heater following the instructions 

found on the inside of the heater. 

Where there is a danger of freezing, shut off the 

water supply and remove the drain plugs on both sides 

of the heater jacket. Drain every part of the system 

subject to damage from freezing temperatures.

Adjust the red knob on the modulating gas valve 

to the dial number for the desired water temperature 

(see Table 7). Adjusting the red knob to number 

"1" sets the gas flow rate to minimum. The control 

is factory set at "2" which is satisfactory for most 

installations.

After a setting has been chosen for the tank 

temperature control, set the heater temperature control 

10°F (6°C) higher.  The heater’s temperature control 

senses the inlet water temperature to the heater.  The 

heater’s manual reset high limit (and automatic 

reset high limit, if applicable) senses heater outlet 

temperature.

If the unit is equipped with an automatic reset 

high limit, set the automatic reset high limit 20°F 

(11°C) above the outlet temperature to avoid nuisance 

lockouts.  Set the manual reset high limit 5°F (3°C) 

above the automatic reset high limit.

For units that only have a manual reset high limit 

(no automatic reset high limit), set the manual reset 

high limit 20°F (11°C) above the outlet temperature to 

avoid nuisance lockouts.

Example, Imperial units:  If the tank temperature 

is set to 140°F, set the heater’s temperature control to 

150°F (140°F + 10°F).  Further, if the temperature rise 

through the heater is 25°F, the outlet temperature will 

be 175°F (150°F + 25°F).  Therefore, set the automatic 

reset high limit to 195°F (170°F + 20°F), and the 

manual reset high limit to 200°F (195°F + 5°F).

When an external control is not used, the 

circulator between the heater and the storage tank 

must run continuously, so that the heater’s temperature 

control can detect and control the water temperature 

in the storage tank.  The water heater’s temperature 

control is adjusted to its lowest temperature position 

(130°F, 54°C) when shipped from the factory.  This is 

the preferred starting point for setting the temperature 

control.

If the unit is equipped with an automatic reset 

high limit, set the automatic reset high limit 20°F 

(11°C) above the outlet temperature to avoid nuisance 

lockouts.  Set the manual reset high limit 5°F (3°C) 

above the automatic reset high limit.

For units that only have a manual reset high limit 

(no automatic reset high limit), set the manual reset 

high limit 20°F (11°C) above the outlet temperature to 

avoid nuisance lockouts.

Example, Imperial units:  If the heater’s 

temperature control is set to 130°F, and the 

temperature rise through the heater is 25°F, the outlet 

temperature will be 155°F (130°F + 25°F).  Set the 

automatic reset high limit to 175°F (155°F + 20°F) and 

set the manual reset high limit to 180°F (175°F + 5°F).

                                                             Temp.
          

Dial No.                          °F                            °C

                1                             120                           49

                2                             127                           53

                3                             135                           57

                4                             142                           61

                5                             150                           66

                6                             157                           69

                7                             165                           74

                8                             172                           78

                9                             180                           82