Bradford-White Corp BRHHV Benutzerhandbuch

Page 42

The mixing actuator connects to both mixing 

valves and takes its signal from the mixing control 
to properly set the valves to protect the copper heat 
exchanger. To remove the actuator, remove the screw 
on the front to take the cover off. Disconnect the wires. 
Take the 2 nuts off the U-bolt, to move the linkage 
to the side, out of the way. Slide the actuator out. 
Reassemble in reverse order.

The ignition control ensures the proved 

interrupted-type ignition system. It controls the 
hot surface ignitor and proves that the flame signal 
is appropriate for powering the gas valves. It also 
controls the blower’s pre-purge and post-purge. To 
replace the control, shut off the 120-volt power to the 
appliance. Remove the cover from the control panel. 
Remove the electrical connectors from the ignition 
control. Take out the controller’s mounting screws, and 
pull the controller out. Replace in reverse order.

The ignitor is a 110v “hot surface” type. It 

is energized whenever there is a call for heat and 
switched off when ignition is established and the flame 
has been sensed. Ignitors with an ohms resistance over 
80 ohms (tested after the ignitor has been allowed 
to cool to room temperature) should be replaced. To 
replace the ignitor, shut off the 120-volt power to the 
appliance, disconnect the Molex connector, remove 
the two mounting screws on the ignitor flange, and 
pull the ignitor out. Always install a new ignitor gasket 
with the replacement ignitor.

Ignitor gets hot and can cause burns or injury.

There are various transformers used on the Brute 

Magnum units. Be sure to replace the transformers 
with factory parts. These transformers are not capable 
of supplying control voltage for external devices such 
as zone valves, which must have their own separate 
power supply. Should a transformer need replacing, 
shut off the 120-volt power. Unplug the transformer 
wires, remove the mounting screws and remove the 
transformer. Replace transformer in the reverse order.

The combustion air blower is a high-pressure 

centrifugal blower with a variable speed motor. The 
speed of the motor is determined by the control logic, 
and the 120-volt current remains on to the blower at all 
times. If a blower change is required, turn off the 120-
volt power and gas supply to the unit. Take the front 

panel, the two side access panels, and the top jacket 
panel off. (If there is enough clearance on the side, the 
top may not have to be removed.) Disconnect the gas 
union between the blower and gas valves. Disconnect 
the filter box assembly (at the air transition) from the 
blower (six 8 mm bolts). Disconnect the two Molex 
electrical connectors from the top right of the blower. 
Remove the four nuts from the blower flange, and 
pull the blower out. Replace blower in reverse order, 
ensuring that all joints are made correctly and sealed. 
After replacement, ensure that the unit operates 
properly, by following the set-up procedure in this 
manual.

The Brute Magnum uses a paddle-type flow 

switch to ensure that the unit has water flow before 
ignition is allowed.

Black carbon soot buildup on the external 

surfaces of the copper heat exchanger is caused by 
one or more of the following; incomplete combustion, 
combustion air problems, venting problems and heater 
short cycling. Soot buildup or other debris on the heat 
exchanger may restrict the flue passages.

If black carbon soot buildup on the copper 

exchanger is suspected, disconnect electrical supply 
to the unit, and turn off the gas supply by closing 
the manual gas valve on the unit. Access the heat 
exchanger through the side access panels, and inspect 
the finned copper tubing using a flashlight. If there is 
a buildup of black carbon soot or other debris on the 
heat exchanger, clean per the following:

Black carbon soot buildup on a dirty heat exchanger 
can be ignited by a random spark or flame. To 
prevent this from happening, dampen the soot 
deposits with a wet brush or fine water spray before 
servicing the heat exchanger.

1. 

Disconnect the electrical supply to the unit.

2. 

Turn off the gas supply by closing the manual gas 
valve on the heater.

3. 

Disconnect and remove the wires, conduit and 
sensors from all components that are attached to 
the inlet/outlet header.

4. 

Isolate the heat exchanger from the water supply.

5. 

Drain the heat exchanger from the drain located 
on the bottom of the heat exchanger.

6. 

Disconnect the header flanges from the inlet and 
outlet.

7. 

Remove the heat exchanger from the unit. 
NOTE: The heat exchangers are heavy and may 
require two people to remove to avoid personal 
injury.