AERCO Boiler Valve Controller (BVC) PRIOR to Serial-12-840-1 - Manual (Page 26)

OPERATION
26
SECTION 3
2B
OPERATION
3.1
12B
INTRODUCTION
The BVC automatically controls each boiler’s Motor Operated Valve (MOV) based on an input
from the corresponding boiler. All MOVs will open automatically whenever all boilers are shut
down. The position of any MOV can also be manually set using the operational sequence
shown in Figure 13. If a boiler is firing, the corresponding valve cannot be moved to the
“CLOSED” position (see Figure 12 screen 3). When a boiler stops firing and a valve close is
requested, the Time Delay function keeps the boiler MOV open for the selected time delay,
allowing water to continue to flow through the boiler to absorb the residual heat before closing
the valve. By using the touch screen a time delay value between 1 and 30 minutes (minimum of
two minutes is recommended) may be selected (see Figure 14).
NOTE
The factory default setting for the time delay is two minutes. AERCO
recommends that the time delay not be set below this value.
3.2
13B
FOUR BOILER SYSTEMS AND TWELVE BOILER SYSTEMS
AERCO’s Boiler Valve Controller unit comes in both 4 boiler and 12 boiler version. This
document describes scenarios associated with a 4 boiler BVC unit. The operational sequences
for the 12 boiler BVC unit are analogous. Table 5 below summarizes the differences in the touch
screen display for these two BVC models.
Table 5 - Touch Screen Differences
Screen 4 Boiler BVC Version 12 Boiler BVC Version
Main “Boilers Firing” and “Valves
Open” indicators have four
value extent each
“Boilers Firing” and “Valves
Open” indicators have twelve
value extent each
Valves Two “Valves” Touch Screen
Buttons. Buttons for “Valves
1-2” and “Valves 3-4”.
Fours “Valves” Touch Screen
Buttons. Buttons for “Valves
1-2-3”, “Valves 4-5-6”, “Valves
7-8-9”, and “Valves 10-11-12”.
Valve Open Close Status Two “Valves” Touch Screen
“OPEN” or “CLOSE” Option
Buttons. Buttons for “Valve 1”
and “Valve 2”.
Similar screen for Valves 3
and 4.
Three “Valves” Touch Screen
“OPEN” or “CLOSE” Option
Buttons. Buttons for “Valve 1”,
“Valve 2”, and “Valve 3”.
Similar screens for Valve sets
4, 5 and 6; 7, 8, and 9; and
10, 11, and 12.
Timer (and sub-Screens) Identical for both the 4 and 12
boiler versions
Identical for both the 4 and 12
boiler versions