Graco FOAM-CAT 200 Series, Instructions And Parts List

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22 308219
Troubleshooting –
Electrical Resistance Checks
Optional ATC
(Ambient Temperature Compensator)
1. Follow the Setup instructions on page 20.
2. Remove the heater control panel (216). See Fig.
13, page 25.
3. Unplug the connector P1 at position J1 on both
heater circuit boards and the hose circuit board.
See Fig. 10 and 11.
4. Check resistance across the two terminals of each
connector P1. The resistance should be:
45K to 55K ohms at 77
_
F (26
_
C), or
10K to 20K ohms at 120
_
F (49
_
C)
5. To replace the ATC, see page 34.
Heater Element
Use this chart to identify the heater assembly and
heater element wires used in your Foam-Cat
r
Heater.
Foam-Cat
Heater
Model No.
Flow
Capacity Heater
Assy. No. Heater Element
Wire Numbers
235260
235840 30 lb/min
(13.5 kg/min) 235840 7,8,9,10 RES
17,18,91,20 ISO
235259
235839 15 lb/min
(6.75 kg/min) 235839 7,8 RES
17,18 ISO
1. Follow the Setup instructions on page 20.
2. Remove the heater control panel (216). See Fig.
13, page 25.
3. Use the procedure in Setup to disconnect the
wires in step 4.
4. Check the resistance across wires 7 and 8, and 9
and 10, on the RES board. Check the resistance
across wires 17 and 18, and then 19 and 20 on the
ISO board. The resistance should be as follows. If
an open conditions exists, check the hi-limit ther-
mostat. See Fig. 10, page 21.
20 to 25 ohms at 77
_
F (26
_
C)
5. To replace the heater element, see page 28.
Hose Sensor Simulator
1. Follow the Setup instructions on page 20.
2. Remove the heated hose control panel (317). See
Fig. 13, page 25.
3. Unplug the connector P2 at position J2 on the
hose circuit board. See Fig. 11.
4. Using the procedure in Setup, page 20, discon-
nect the two leads from the hose sensor simulator
(304) connect to the circuit board connector T1 at
positions 2 and 4.
5. Check the resistance across the two outside
terminals of connector P2. The resistance should
be:
45K to 55K ohms at 77
_
F (26
_
C), or
10K to 20K ohms at 120
_
F (49
_
C)
6. Check the resistance across the two leads
removed from T1. The resistance should be:
13K TO 17K ohms
7. To replace the simulator, see page 34.