52
switch, the operating control relay (OCRC) remains open. When the user has finished setting the P00
position for all servos, P00 is complete and the user will press the NEXT key to set up P01. At this
point a profile will need to be selected requiring the operating control relay to become closed. If the
burner control switch is closed, the keypad BURNER ON/OFF pressed and LED illuminated and all
other startup permissives are met (i.e. pressure / temperature), the PPC4000 will close the operating
control relay (OCRC) and the YB110 (flame safeguard) will start the combustion motor through ter-
minal M. If wired as recommended, this will force a profile to be selected. The YB110 controller will
also enter the purge position and output to the PPC4000 the high fire command. The high fire com-
mand output from YB terminal X is connected to a designated digital input, HIGH, on the PPC4000
controller.
If a profile is selected but terminal X, P15.2, is not being annunciated by the YB, the display is as fol-
lows:
Having a profile selected and the high fire output active results in only those servos mapped to the
selected profile to be as shown in the following example
:
Position P01 is the purge position. If previously set the servos will move to their previously pro-
grammed positions and stop. With the UP and DOWN keys, the user moves the servo to be posi-
tioned into the shaded area and presses the MDFY key. The UP and DOWN keys are then used to
select the new target position. The displayed value responds to the UP and DOWN keys. When the
new target position is selected, the user presses the SAVE key to retain the settings and the selected
servo will move to the new position.
When satisfied with all servo positions the user presses the NEXT key to force the output of the
proven high fire switch that signals the YB110 control on terminal 8 to begin its pre-purge timer.
During the purge period the servo positions are inhibited from being moved.
Once pre-purge is completed (30 seconds typical) the YB110 controller will request the PPC4000 to
move to its ignition position, P02 by the low fire output from the YB110 controller on terminal 12.
The display will indicate:
If previously set, during the low fire start position the servos will move from their pre-purge position
to their ignition or light-off positions and stop. Otherwise, the user moves the servo to be positioned
into the shaded area and follows the procedure using the UP, DOWN and MDFY/SAVE keys to
properly position the servos and save this data. The display may look like the following:
C
O
M
M
I
S
S
I
O
N
I
N
G
p
0
1
>
W
A
I
T
F
O
R
P
U
R
G
E
<
C
O
M
M
I
S
S
I
O
N
I
N
G
p
0
1
>
A
I
R
(
1
)
3
.
1
°
<
G
A
S
(
3
)
1
.
9
°
C
O
M
M
I
S
S
S
I
O
N
I
N
G
p
0
2
>
A
I
R
(
1
)
8
7
.
5
°
<
G
A
S
(
3
)
1
.
9
°
C
O
M
M
I
S
S
S
I
O
N
I
N
G
p
0
2
>
A
I
R
(
1
)
7
.
5
°
<
G
A
S
(
3
)
5
.
4
°
