Graco B Series Instructions-Parts List Manual page 25

NOTE: If replacing the rear element, go to Step 16.
13. If the front heater element was replaced, tighten
the probe adapter (257) just ONE turn.
14. Reposition the heater element tube on the rear
panel (240). Install the screw (235A) and lock-
washer (236A) into the manifold (253) through the
back of the manifold bracket front flange. Engage
a couple of threads.
15. Reinstall the screw (235B) and lockwasher (236B)
through the rear of the mounting bracket (234).
Tighten firmly and then finish tightening the front
screw and lockwasher.
NOTE: You may find it easier to position and install the
screws (235A and 235B) if one person holds up the
heater element tube while another person installs the
screws.
Wiring Schematics
Heater No. 235–840 is shown
in Fig. 19. The wiring for Heater
No. 235–839 is identical except
the second set of elements
(wires 9, 10, 19, 20) are not
used.
Fig. 19
Service –
RESIN HEATER
OPTIONAL ATC
TRIAC
B C
A
+ +
+ +
P1
OPTIONAL P1
STANDARD
ISO HEATER
OPTIONAL ATC
TRIAC
B
C
A
+ +
+ +
P1
OPTIONAL
P1
STANDARD
Heater Element
16. Remove the control panel cover (216). Guide the
wires of the heater up through the bottom of the
control box.
17. Remove the strap holding the heater. Position the
heater mounting bracket over the threaded shafts
of the cylindrical mounts (104 and 105). Install the
lockwashers (103) and nuts (102).
18. Connect the heating element wire to the Hi-Limit
Thermostat.
19. Reinstall the heater element and thermostat wires
at terminal block T1 of the circuit board. See Fig.
19 for the proper wire positions.
20. Reinstall the control panel cover (216).
LAMP
BOARD
D
C
BLK
4
–
BLK
– 3
T1
WHT
+ 2
WHT
+ 1
M+
MT1
M– TEMP DIAL
MT2
G
J2
CAL
A
J1
B
P2
CONNECTOR
LAMP
BOARD
D
C
BLK
– 4
BLK
– 3
WHT
T1
+ 2
WHT
+ 1
M+
MT1
TEMP DIAL
M–
MT2
G
J2
CAL
A
J1
B
P2
CONNECTOR
POWER IN
1
TERMINAL
2 2
1
BLOCK (TB)
3
A A
4
11
5
12 6
B B
CIRCUIT BREAKER
7
9
8
10
ELEMENTS
N.T.C
SENSOR
HI-LIMIT
PROBE
THERMOSTAT
POWER IN
1
TERMINAL
2
4
3 BLOCK (TB)
3
A A
4
21
5
22 6
B B
CIRCUIT BREAKER
19
18
20
ELEMENTS
N.T.C
SENSO
HI-LIMIT
R
THERMOSTAT
PROBE