Overview of Primary Product

13
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If the VLSD does not activate the VLSD 120 VAC input within 40 seconds, then an alarm lockout
will occur, and the following message will appear on the optional remote display:
VALVE LEAK FAIL
If a valve leak occurs, then the fan output on the Multi-Burner Control will be activated to purge the
combustion chamber of gases.
If the VLSD input is not used, then it should be connected to 120 VAC.
Remote Display Units
The MB510 Display unit is available with a keypad and keypad allows remote reset and activation of
the history log option. The display module is panel mountable and features a liquid crystal display in
a 1/4 DIN housing.
The MB510 display module connects to the Multi-Burner Control by a 6 or 10 foot cable.
The MB510 display incorporates the following features:
1. Provides status messages for the Multi-Burner Control sequence.
2. Indicates lockout conditions when they occur, as well as the amount of time into the sequence
when the lockout occurred.
3. Provides continuous monitoring of each burner’s flame signal strength during main burner oper-
ation. (Pressing ENTER once will lock on a particular burner’s status; pressing ENTER a sec-
ond time will resume scrolling).
4. Incorporates a remote reset key into front membrane of unit (remote with keypad only).
5. Provides the interface required for the History Log option (remote with keypad only).
6. Incorporates ENTER key for pilot test mode.
History Log Activation
The history log is only accessible through an optional remote display unit with remote reset, and
when the Multi-Burner Control is in a “LOCKOUT” or “LIMITS OPEN” condition. The history log
records the total number of operating cycles, and the last lockout messages up to a maximum of 10.
With a remote display available and the Multi-Burner Control in one of the two conditions described
above, the history log can be accessed as follows:
1. Press and hold the ENTER key on the remote display unit until the following message appears:
TOTAL OPERATING
CYCLES = XXXXX (where X is a digit between 1 and 9)
The record number will display as long as the ENTER key is pressed.
2. Release and press the ENTER key a second time. The record number of the lockout message
will be displayed:
RECORD #X (where X is the number of the most recent lockout)
3. Release the ENTER key and the most recent lockout message will display for seven seconds.
4. To see the next lockout message, press and release the ENTER key before the seven second time
duration ends of the most recent lockout message display. This will prompt the next lockout
message. If desired, continue this procedure until the maximum of ten lockout messages has
been displayed (remember that the highest record number is the most recent lockout message).
5. Continued pressing and releasing of the ENTER key in less than seven seconds keeps the his-
tory log active and repeats the lockout message list; waiting longer than seven seconds deacti-
vates the history log mode and the next display is the last sequence message before the history
log was activated. For example, if the message “LIMITS OPEN” was displayed when the his-
tory log was activated, then that message will appear again after seven seconds.
6. To erase all of the lockout messages from the history log, press the RESET and ENTER keys
simultaneously while the history log is active. Release the RESET key, but hold the ENTER key
for another five seconds.