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ST7700
INSTALLATION
the module farthest from the Chassis Module.
8. The ControlBus cable shield must be connected to
ground at the Keyboard Display and at the Chassis Mod-
ule. Failure to terminate the shield may result in improper
ControlBus operation.
9. Maximum wire lengths—The maximum ControlBus
leadwire length, under ideal conditions, is 1000 feet.
10.
Restore power to the panel.
ST7700 Keyboard functions—The keyboard contains
11 key pads and each has a separate function:
Λ
1. Cursor keys [
scroll through available parameters. The
pressed to list the parameters one at a time or the
can be held down constantly and the parameters will scroll
through at a rate of one per second.
Λ
Fig. 5—[
]/[v] key function.
Auto
190 PSI
Run 30% Rate
[V] TO SELECT NEXT PARAMETER
Auto
190 PSI
Run 30% Rate
2. Cursor keys [</>]—The </> keys move the cursor
around the ST7700 LCD fields. The cursor is the one
segment wide flashing horizontal line in the LCD.
Fig. 6—[<]/[>] key function.
Auto
190 PSI
Run 30% Rate
MOVE CURSOR TO PARAMETER VALUE [>] KEY PRESS
Auto
190 PSI
Run 30% Rate
MOVE CURSOR TO PARAMETER VALUE [>] KEY PRESS
Auto
190 PSI
Run 30% Rate
Λ
/v]—The
/v cursor keys are used to
Λ
/v key can be
FlameSignal
OperSetPoint 185 PSI
Flame Amplifier R7748
OperSetPoint 185 PSI
FlameSignal
2.5V
OperSetPoint 185 PSI
CURSOR
FlameSignal
2.5V
OperSetPoint 185 PSI
FlameSignal
2.5V
OperSetPoint 185 PSI
3. Mode key—The Mode key is used to toggle the BCS
7700 between the Operate and Program Modes, see Fig. 7.
a. Switching to Program Mode from Operate
Mode—If in the Operate mode, with the burner in
Standby or if the BCS 7700 is in safety shutdown,
the Mode key can be pressed to place the system
in the Program mode. The Program mode cannot
be entered when the burner sequence has begun.
Program mode can be entered ONLY in Standby
or if the BCS 7700 is locked out.
b. Switching to Operate Mode from Program
Mode—If in the Program mode, the Mode key
can be pressed to place the system in the Operate
Λ
/v key
mode. The ENTER key should be pressed prior to
switching to the Operate mode to assure the
displayed parameter value is stored in the BCS
7700 microcomputer memory.
Fig. 7—[Mode] key function.
CHANGE MODE FROM OPERATE TO PROGRAM
IN OPERATE MODE
2.5V
Auto
Standby GAS
PLACE SYSTEM IN PROGRAMCONTROL, [MODE] KEY
BLC Program
[v] to set parameters [MODE] to OPERATE
M576
CHANGE MODE FROM PROGRAM TO OPERATE
IN PROGRAM MODE
BLC Program
[>] to set value
PLACE SYSTEM IN AUTOMATIC MODE, [AUTO/MANUAL] KEY
Auto
Standby
4. AUTO/MANUAL key—The AUTO/MANUAL key
places the BCS 7700 in an automatic [AUTO] sequence
operation or a manual (MANUAL) sequence operation.
The AUTO/MANUAL key function has control of the
BCS 7700 only when in the Operate mode. When in the
Program mode, the AUTO/MANUAL key has no func-
tion.
• AUTO (automatic) control allows the BCS 7700 to
sequence the burner based on safety sequence logic
and rate control of the BCS 7700. The system starts
and stops the burner automatically, see Fig. 8.
• MANUAL (manual) control allows manual adjust-
ment of the firing rate motor position. The cursor
must be placed beneath % Rate to allow manual
adjustment of firing rate using the [+] or [-] keys.
M1112
The BCS 7700 assures system safety, but firing rate
control is removed from the BCS 7700 rate control
and manual firing rate takes control, see Fig. 8.
6
190 PSI
FlameSignal
OperSetPoint 185 PSI
System is configured
OperSetPoint 185 PSI
[v] for next
190 PSI
FlameSignal
GAS
OperSetPoint 185 PSI
0.0V
0.0V
M1453C
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