Weil-McLain BMC-6X operation manual System Settings, Gain, Lead Boiler Rotation, Purge Delay

BMC and BMC-6X Installation and Operation Manual

SYSTEM SETTINGS

Button: MENU/<System Settings>

The Settings 1 and Settings 2 menus provide access to adjusting and fine-tuning the system for enhanced comfort and more fuel savings. The BMC behaves differently based on the selected Control Modes (see Startup Settings).

•	Gain	•	System Run-On
•	Lead Rotation	•	Setback
•	Purge Delay	•	Last Stage Hold
•	Lag Delay	•	Day/Night Schedules

•Standby Time

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.

GAIN

Adjustable from -10 to +10	Default: 0
Button: MENU/<System Settings>/Gain

•The Gain adjusts the aggressiveness of the BMC PID logic to control how much modulation is changed when the system temperature is different from the Set Point.

•A Gain of 0 is a good starting point for all systems.

•If during normal load conditions, the system temperature tends to oscillate significantly, decrease the Gain by two numbers (for example, from 0 to -2). Wait for at least 15 minutes before evaluating how the change has affected the system.

•If during normal load conditions the system temperature tends to remain consistently below the Set Point (or consistently above the Set Point), increase the Gain by two numbers (for example, from 0 to 2). Wait for at least 15 minutes before evaluating how the change has affected the system.

LEAD BOILER ROTATION

Adjustable Manual, Time (1 hr to 60 Days), Last-On	Default: Time (24Hours)
Button: MENU/<System Settings>/Lead Rotation

•The Lead Boiler is the first boiler brought on when output is required.

•The Lead Boiler can be rotated automatically, manually or based on Last-On. The automatic rotation is recommended.

•The current Lead Boiler is shown in brackets on the main display.

•Only boilers which are set to Auto Mode can be Lead. Therefore, not all the boilers may be available when manually selecting a new Lead Boiler.

PURGE DELAY

Adjustable from 0.0min to 10.0min	Default: 1.0min
Button: MENU/<System Settings>/Purge Delay

•Many boilers go through a purge cycle before they are brought on line.

•When the BMC activates a boiler, it does not start to calculate its output until the Purge Delay is over. This allows the boiler to fully come online and begin producing output.

•The Purge Delay helps prevent short cycling of a newly activated burner. Once the burner is activated, it MUST run through the entire Purge Delay period.

•The minimum Purge Delay setting MUST be set to the time required by the boiler manufacturer. Time entry is in 0.1 of a minute (i.e. 1.5min will equal 90 seconds.)

•The Message Display Line will display Purge Delay and the amount of time remaining in the purge.

----------		SETTINGS		1	----------
Gain						+0
Lead	Rotation				Time
Purge Delay					0.0min
Lag	Delay				0min
<More Settings>
BACK					SELECT
----------		SETTINGS		2	----------
Standby		Time			10min
System		Run-On			0min
Setback					0	F
Last	Stage		Hold		0	F
Set	Time				12:03Pm
<Day/Night			Schedules>
BACK					SELECT
		PROGRAM			RUN
----------------		GAIN --------------
		+0 F
[]
BACK					SAVE
--------	LEAD ROTATION				-------
Manual
Time
Last-On
BACK					SAVE
--- AUTO ROTATE PERIOD ---
		24hrs
[]
BACK					SAVE
---- MANUAL LEAD STAGE ----
A
B
C
D
E
BACK					SAVE
---------	PURGE		DELAY	---------
		0.0min
[]
BACK					SAVE

ALERT

Set Purge Delay as per boiler manufacturer recommendation.

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