Check Heater; Check Rtd - Graco InvisiPac GS35 Plug-Free Instruction Manual

Check Heater

Heater
Check Check Heater
Check the continuity of the heater to verify proper
resistance. If there is no continuity, the heater
may have failed and need to be replaced. See
Wiring Diagram, page 21, and parts illustrations.
1. Disable gun assembly. See
Before Beginning Repair, page
2. Check resistance of the heater using a multimeter
between the pins of the cordset connector. See
connectors illustrations in cordset pin tables.
• If there is no continuity measure resistance of
the heater at the butt splice terminals (52b).
• If the resistance is outside the range listed
below replace the heater cartridge. See
Replace Heater Cartridge, page
Cordset Check
Cordset Cordset Check Check
Pins
Pins Pins
24W087, A and C
Pt 100
(385) RTD
Cordset
24W088, 1 and 2
Ni 120
RTD
Cordset
3A2805M
19.
20.
Gun Model Model Resis- Resis- Resis-
Gun Gun Model
tance
tance tance
Values
Values Values
24U021–24U0
26 260–280
24U027–24U- ohms
032
All other 130–140
models ohms
24U021–24U0 260–280
26 ohms
24U027–24U-
032
All other 130–140
models ohms
Table 1 1 1 24W087, 24W087, Pt Pt Pt 100 100 (385)
Table Table 24W087, 100
Pin Description
Pin Pin Description Description
A Thermal Cutoff
B
Ground
C Heat -
D RTD (White)
E RTD (Red)
Table Table Table 2 2 2 24W088, 24W088, Ni Ni Ni 120 24W088, 120 120 RTD
Pin Pin Pin Description Description Description
1
Thermal Cutoff
2 Heat -
3 RTD (White)
5
RTD (Red)
G Ground

Check RTD

RTD
Check Check RTD
Check the continuity of the RTD to verify proper
resistance. If there is no continuity, the RTD has
failed and needs to be replaced.
1. Disable gun assembly. See
Before Beginning Repair, page
2. Check resistance of the RTD using a multimeter
between the pins of the cordset connector. See
connectors illustrations in cordset pin tables.
Cordset Cordset Cordset Check Check Pins Check
24W087, Pt D and E
100 (385)
RTD Cordset
24W088, Ni 3 and 5
120 RTD
Cordset
3. Replace the RTD if the resistance reading is
outside the range, or if there is no continuity. See
Replace RTD, page
Troubleshooting
(385) RTD RTD Cordset Cordset
(385) RTD Cordset
RTD Cordset RTD Cordset Cordset
19.
Pins Pins Resistance Resistance Resistance
Values Values Values
At At At Room Room Room
Temperature Temperature Temperature
70–72° ° ° F F F 70–72 70–72
(21–22° ° ° C) C) C)
(21–22 (21–22
107-115
ohms
130-140
ohms
20.
17