Weil-McLain BMC-6X Maintenance, System & Outdoor Sensor Trim, SOFT-OFF Delay, Output Trim

BMC and BMC-6X Installation and Operation Manual

MAINTENANCE

Button: MENU/<Maintenance>

The Maintenance menu gives access to sensor and outputs trimming and Soft-Off. In addition, you'll have access to view the Startup configuration settings.

ALERT

To be able to change the BMC settings the Program/Run Switch must be set to Program. The switch is located under the Enclosure Wiring Cover for security. The Enclosure Wiring Cover can be securely closed using a lock.

SYSTEM & OUTDOOR SENSOR TRIM

Adjustable from -5F°/-3C°to +5F°/+3C°	Default: 0°F
Button: MENU/<Maintenance>/System Trim
Button: MENU/<Maintenance>/Outdoor Trim

•The Weil McLain thermistor type sensors are very accurate, and normally require no calibration. Sometimes it may be desirable to make small adjustments to the displayed value for either the Outdoor temperature (OD) or the System temperature (SYS). The Trim setting can adjust the displayed value by ± 5°F.

•Do not use the Trim setting to make the Outdoor temperature sensor match that reported on the radio or TV. Outdoor temperature can vary widely over a broadcast range. Only trim the outdoor sensor based on an accurate thermometer reading taken where the sensor is located.

SOFT-OFF DELAY

Adjustable from 0sec to 60sec	Default: 45sec
Button: MENU/<Maintenance>/Soft-Off Delay

•When a stage is no longer needed, the Soft-Off keeps that stage burner in Low Fire prior to turning it off.

•The display will show a percent that is equal to the Ignition % for the stage in Soft-Off delay. That number will blink for the Soft-Off delay period.

•If during the Soft-Off delay period the BMC needed that stage to turn back on, the stage will be released from the Soft-Off delay and resume normal operation.

•On a Shutdown initiation or Tstat termination any stage that was on will go into Soft-Off delay before fully turning off.

----------	MAINTENANCE	---------
System	Trim	+0	F
Outdoor	Trim	+0	F
Soft-Off Delay		45sec
<Output	Trim>
<Configuration>
BACK		SELECT
PROGRAM		RUN

---SYSTEMSENSORTRIM----

	+0 F
[]
BACK	SAVE
-- OUTDOOR SENSOR TRIM ----
	+0 F
[]
BACK	SAVE
------- SOFT-OFF DELAY --------
	45sec
[]
BACK	SAVE

ALERT

When using Soft-Off and Last Stage Hold, the last boiler stage will not turn off until both parameters have elapsed. In this case, Soft-Off will start after the Last Stage Hold has been reached or exceeded.

OUTPUT TRIM

Adjustable from -5 to +5	Default: 0
Button: MENU/<Maintenance>/Output Trim

•Each of the stages controlled by the BMC has a separate Output Trim setting.

•Output Trim acts as an adjustment to a stage output percent to match the burner motor.

•After adjusting the Output Trim, test the operation to make sure the results match your expectation.

--------	STAGE A	TRIM --------
Output	Trim	+0.0
<Prev	Stage>
<Next	Stage>
BACK		SELECT

ALERT

DO NOT use the Output Trim for a Stage unless it is absolutely necessary. Test burner operation and modulation output matching after adjusting the Output Trim.

23