EB-NB Installation Manual

12/28/2018 30 BI804
Emergency Override
If this is not a dual boiler installation and in case of an absolute necessity to maintain building heat or
freeze-up, the service technician or maintenance technician can consider rewire and manually operate the
Sequencers.
CAUTION
WHEN OVERRIDING THE BUILT-IN CONTROLLERS IN THE FOLLOWING STEPS, ALL
ALARM LIMITS ARE STILL ACTIVE AND WITHIN THE CONTROL CIRCUITRY. IT IS
STRONGLY RECOMMENDED NO FURTHER BYPASS BE CONTEMPLATED OR USED IN
ORDER TO MAINTAIN PROPER SAFETY.
Green LED off or no 10VDC at test point W2 – depending upon the sequencer, circuitry or wiring can
be provided directly into the Sequencer to stage in the contactors.
Electro Sequencer – interface is at the J3 connector. 24VAC is required at J3-8 (yel/blk) and 16VDC-
24VDC is required at J3-6 (red), J3-5 (gray) is common. Worst case, the 16VDC will work with two 9-
volt batteries in series.
Either with 4 switches or jumpers setup the appropriate stage code based upon the following table.
Heating Stage J3-1 J3-2 J3-3 J3-4
1 X
2 X
3 X X
4 X
5 X X
6 X X
7 X X X
8 X
9 X X
10 X X
11 X X X
12 X X
13 X X X
14 X X X
15 X X X X
The X’s in any horizontal stage column would mean a jumper to ground or control common. The
Sequencer will immediately go to that specific stage. Example – stage 10, J3-1 and J3-3 both pulled
down.