Graco 249570 A, Instructions-Parts List Manual

Page: 39 / 68

Repair
311075ZAB 39
Control Module
Change Display Temperature Units (°F/°C)
The unit is shipped with the temperature displays set to
°F.
1. Shut off Motor Power. Disconnect the power supply.
2. Remove the access cover (39) from the back of the
control module.
3. See F
IG
. 13, page 40. Locate the slide switch (FC)
at the right edge of each temperature display board.
The unit is shipped set to °F (down). To change to
°C, move both switches to the up position.
Calibrate Temperature Displays
1. Remove the access cover (39) from the back of the
control module.
2. See F
IG
. 13, page 40. Locate the calibration screw
(CS) at the upper right corner of each temperature
display board. Turn the screw slightly to correct the
temperature display.
NOTE: The temperature displays do not read lower than
50°F (10°C).
Replace Temperature Display and Sensor
(Heated Units Only)
1. Follow Before Beginning Repair , page 36.
2. Follow the Pressure Relief Procedure , page 22.
3. Remove the temperature sensor (424):
a. Remove the snap ring (66d) in the thermowell
housing (66e).
b. Pull the sensor (424) and the spacer (66g) out
of the thermowell housing.
c. Work the sensor and wire out of the cable
channel between the tanks. It may be easier to
remove one tank. See
Remove Supply Tanks ,
page 36.
4. Remove the access cover (39) from the back of the
control module.
5. Disconnect the temperature display power cable
from J14 or J15 at the bottom left of the control
board (406).
6. Remove four screws from the rear panel studs and
remove the temperature display (403) from the front
plate (401).
7. Remove the screw and nut (409) holding the display
to plate (403).
8. Pull the sensor cable through the split in the bushing
(411).
9. Reassemble in reverse order. Mount the
temperature display so the heater power switch off
(0) position is at the left when facing the control
panel.
TI7067b
66g
424
66d
66e