Bradford-White Corp BRHHV Manual De Usuario

Page 24

The appliance must be electrically grounded in 
accordance with the requirements of the authority 
having jurisdiction or, in the absence of such 
requirements, with the latest edition of the National 
Electrical Code, ANSI/NFPA 70, in the U.S. and 
with latest edition of CSA C22.1 Canadian Electrical 
Code, Part 1, in Canada. Do not rely on the gas 
or water piping to ground the metal parts of the 
boiler. Plastic pipe or dielectric unions may isolate 
the boiler electrically. Service and maintenance 
personnel, who work on or around the boiler, may 
be standing on wet floors and could be electrocuted 
by an ungrounded boiler. Electrocution can result in 
severe injury or death.

Single pole switches, including those of safety 

controls and protective devices must not be wired in a 
grounded line.

All electrical connections are made in the field 

wiring box that is located inside the appliance.

NOTE: All internal electrical components have been 
prewired. No attempt should be made to connect 
electrical wires to any other location except the wiring 
box.

Wiring connections are shown in Figures 17 

through 24.

Connect a properly sized and fused, 120-volt 

supply to the main power switch (hot leg is connected 
directly to switch). Neutral leg is connected directly to 
the white wire. Ground wire can be connected to the 
grounding screw in the box or on the switch.

The pump time delay relay will call the pump 

to be energized upon a call for heat, and will keep the 
pump energized for a delay period after the call for 
heat has ended.  The delay period is adjustable from 
0.1 to 10 minutes.

Brute Magnum units have pumps that are wired 

at the factory to the pump time delay system. It is 
necessary to wire the pump to a separate 115V or 
230V single phase circuit, per the wiring diagrams in 
Figures 17 through 20.

Connect boiler field interlock wires to isolated 

contacts on zone valves, circulator relays, sequencing 
controls (multiple boiler applications) or other 
temperature controlling devices.

The Brute Magnum temperature control 

measures temperature on the boiler inlet, sensing 
return water temperature.  Set the temperature control 
for the desired return temperature.  If the return water 
temperature is less than 140°F (60°C), internal mixing 
will keep the outlet temperature at 160-165°F (71-
74°C).  If the return temperature is 140°F (60°C) or 
higher, the outlet temperature of the boiler will be the 
return temperature plus 20-25°F (11-14°C) when the 
Brute Magnum is at high firing rate.

The manual reset high limit is on the outlet of 

the Brute Magnum.  Set the manual reset high limit at 
about 20°F (11°C) higher than the highest expected 
outlet temperature, to avoid nuisance lockouts.

The Brute Magnum water heater can be used 

with a field-supplied tank aquastat, sequencing control, 
or other temperature control device, which will call 
the unit for heat when the temperature goes below the 
controller’s setpoint. For the most efficient setting, set 
the tank temperature at the lowest possible setting for 
adequate hot water in the application.

If the tank temperature control is set too high, a 
potential for hot water scalding may exist.

After a setting has been chosen for the tank 

temperature control, set the heater temperature control 
10°F (6°C) higher. The Brute Magnum temperature 
control measures temperature on the heater inlet, 
sensing return water temperature.  If the return water