Weil-McLain BMC-6X Boiler User Manual


 
19
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).
BACK SELECT
---------- 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>
RUNPROGRAM
• Gain
• Lead Rotation
• Purge Delay
• Lag Delay
• Standby Time
• System Run-On
• Setback
Last Stage Hold
• Day/Night Schedules
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.
BACK SAVE
---------------- GAIN --------------
+0
F
[]
BACK SAVE
-------- LEAD ROTATION -------
Manual
Time
Last-On
BACK SAVE
---- MANUAL LEAD STAGE ----
A
B
C
D
E
BACK SAVE
--- AUTO ROTATE PERIOD ---
24
hrs
[]
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.
BACK SAVE
--------- PURGE DELAY ---------
0.0
min
[]
ALERT
Set Purge Delay as per boiler
manufacturer recommendation.