Bradford-White Corp BMT2V Filter, Gas Valves, Manual Reset High Limit Control, IgnitionControls

Page 30 BRADFORD WHITE CORP.

7.2.2 Filter

The filter used in the Brute Deluxe is washable with an 83% arrestance. Since the filter is washable, it will only need replacement when unwashable, deteriorated or damaged. If filter replacement is needed, it should only be replaced with a factory part. Inspect the air filter. If there is debris on the air filter, remove it from the filter box, and wash it with mild soap and water. Ensure that the filter is completely dry before re- installing, in reverse order.

7.2.3 Gas Valves

The gas valves are designed to operate with supply pressures of 4-13 inches w.c. (1.0 to 3.2 kPa).

To remove a valve, shut off 120-volt power and the manual gas shutoff valve. Remove the top front panel from the unit. Disconnect the wires to the valve. Disengage the flanged fitting before and after the valve, and remove the valve. Re-install in reverse order. Ensure o-rings are properly installed for both inlet and outlet. Turn on manual gas shutoff valve and 120 volt power and check appliance operation and tightness of gas valve connections.

7.2.4 Manual Reset High Limit Control

The high limit switch is manual reset switch with an adjustable set point, up to 240°F (116°C) on boiler models and 200°F (93°C) on water heater models and boilers ordered with low temperature controls. To replace the switch, shut off the 120-volt power to the appliance. Remove the cover from the switch to access the mounting screws. Remove the screws, and pull the switch off the control panel. Remove the capilliary and bulb from the thermal well located in the header. Replace in reverse order.

7.2.5 Temperature Control

The temperature control is a Honeywell L6008. To replace the control, shut off the 120-volt power to the appliance. Remove the cover from the control panel, and remove the mounting screws to remove the controller. Replace in reverse order.

7.2.6 IgnitionControls

The ignition controls ensure the proved interrupted- type ignition system. They control the hot surface ignitors and prove that the flame signal is appropriate for powering the gas valves. It also controls the blower’s pre-purge and post-purge. Brute Deluxe sizes 500 and 750 have one ignition control. Sizes 1000 to 2000 have two ignition controls. On sizes up to 750, one ignition control controls stages 1 and 2. On unit sizes 1000– 2000, one ignition control is for stage 1, and the other is for stage 2.

To replace a 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.

7.2.7 Ignitors/Sensor

The ignitor/sensor used are 120v "hot surface" type. They are energized whenever there is a call for heat and switched off when ignition is established and flame has been sensed. Brute Deluxe sizes 500 and 750 have one ignitor/sensor. Sizes 1000 to 2000 have two ignitor/sensors. To replace the ignitor/sensor, shut off the 120-volt power to the appliance, remove the ignitor access panel, disconnect the Molex connector, remove the two mounting screws on the ignitor/sensor flange and pull the ignitor out. ((Hot Surface) Ignitor and the Flame Sensor are the same items). Install in reverse order, always using a new ignitor gasket with the replacement ignitor.

Caution

Ignitor gets hot.

7.2.8 Transformer

The transformer is 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.

7.2.9 Blowers

The combustion air blowers bring the combustion air for the Brute Deluxe from the upper chamber to the lower chamber. Mixing of the gas and air occurs in the burners. Sizes 500, 750 and 1000 each have one blower, and sizes 1250 to 2000 each have two blowers. If a blower change is required, turn off the 120-volt power and gas supply to the unit. Remove the front panel. Disconnect the blower's wire harness. Remove the screws at the blower flange, and pull the blower out. Replace blower in reverse order, ensuring that all joints are made correctly. After replacement, ensure that the unit operates properly, by following the set-up procedure in this manual.

7.2.10 Flow Switch

The Brute Deluxe uses a paddle-type flow switch to ensure that the unit has water flow before ignition is allowed.

7.2.11 Heat Exchanger Coil

WARNING

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