Graco B Series Instructions-Parts List Manual page 27

Reassembly
1. Apply conductive paste (Graco P/N
110–009) to the bottom flange of the triac
(223a or 306a). Position the triac as
shown in Fig. 20. Use the screws (291 or
336) and lockwashers (292 or 337)
to mount the triac to the back of the
control.
2. Position the new circuit board in the
control box. Install the screws (284 or
335), starting the first screw at the lower
front corner. After each screw is started,
snug them tightly.
3. Plug in the triac wires, if not plugged in.
See Fig. 14, page 22. Verify the triac
wiring with the label (276) located inside
the control box. See Fig. 20, page 26.
NOTE: See Setup on page 18 for how
to reconnect the wires.
4. If used, plug the ATC connector (T) into
the circuit board position J1. Otherwise,
make sure the 2 pin connector is
installed at J1 with the 47.5K resistor.
See Fig. 20 and 21.
5. Reinstall the heater element wires into
terminal block T1, in the positions indi-
cated in Fig. 21.
6. Plug the indicator light leads (214 or 314)
into the rear of the indicator light. See
Fig. 20 and 21.
7. Plug in the wires leading to the TEMP
SET dial (213 or 315). See Fig. 20 and
21.
8. Plug the sensor probe connector P2 into
the circuit board at position J2. See Fig.
20 and 21.
9. Reinstall the control panel cover (216 or
317) and tighten the screws firmly.
Service –
Wiring Schematics
NOTE: Heater No. 235–840 is shown in Fig. 21. The
wiring for Heater No. 235–839 is identical except the
second set of elements (wires 9, 10, 19, 20) are not used.
RESIN HEATER
OPTIONAL ATC
+ +
P1
OPTIONAL
ISO HEATER
OPTIONAL ATC
+ +
P1
OPTIONAL P1
HOSE HEATER
OPTIONAL
ATC
P1
OPTIONAL
Fig. 21
Circuit Board
LAMP
BOARD
D
C
– 4
– 3
T1
+ 2
TRIAC
+ 1
M+
B C
MT1
A
M–
MT2
G
J2
CAL
A
J1
B
+ +
P1
P2
STANDARD
CONNECTOR
LAMP
BOARD
D
C
BLK
–
4
BLK
–
3
T1 WHT
+
2
TRIAC
WHT
+
1
B M+
C
MT1
A
M–
MT2
G
J2
CAL
A
J1
B
+ +
P2
STANDARD
CONNECTOR
HOSE
SENSOR
SIMULATO
R
LAMP
BOARD
D
C
– 4
–
3
T1
TRIAC + 2
+ 1
B M+
C MT1
A
M–
MT2
G
J2
CAL
A
J1
B
+ +
P1
P2
STANDARD
CONNECTOR
POWER IN
TERMINAL STRIP
1
2 2
1
3
A A
4
11
5
12 6
B B
CIRCUIT BREAKER
BLK
7
9
BLK
WHT
8
10
WHT
TEMP DIAL
N.T.C
SENSOR
LIMIT
PROBE
THERMOSTAT
POWER IN
TERMINAL STRIP
1
2
4
3
3
A A
4
21
5
22 6
B B
CIRCUIT BREAKER
19
18
20
TEMP DIAL
N.T.C
SENSO
LIMIT
R
THERMOSTAT
PROBE
POWER IN
TERMINAL STRIP
1
2
3
A A
4
5
GFI
6
B B
BLK
BLK
WHT
WHT
TEMP DIAL
B
A
HOSE
CONNECTOR
ELEMENTS
ELEMENTS