Troubleshooting - Graco VISCON HP 309524L Instructions Manual

Troubleshooting

Problem
Heater will not heat.
Temperature too low.
Temperature too high.
High fluctuating temperatures, about
220-250°F (104-120°C) at 0.1 GPM.
Too much pressure drop or fluid will
not flow.
Heater fittings leak.
F . 14: Electrical Schematic
IG
309524L
No current.
Burned out heater block (3).
Blown heat limiter (15).
Fluid requires more warm-up time.
Wrong temperature setting.
Flow rate too high.
Clogged fluid passages.
Wrong temperature setting.
Failed primary thermostat (24).
Primary thermostat (24) contacts
sticking.
Flow rate too high.
Clogged fluid passages.
Loose or damaged fittings.
OFF
300°F
F
(149°C)
e
2
Cause
Check circuit and fuses.
Check continuity of primary thermo-
stat (24), backup thermostat (10),
and thermal limit sensor (15).
Check continuity of thermostat (10)
and heater block (3) terminals - Page
18.
Replace block - Page 20.
Check continuity of primary thermo-
stat (24) and backup thermostat (10).
Replace thermostats if necessary
when replacing thermal limit sensor
(15) - Pages 18-20.
Increase warm-up time.
Adjust setting - Page 15.
Reduce flow rate or use 2 heaters.
Flush regularly - Page 16.
Adjust setting - Page 15.
Replace - Page 18.
Replace thermostats (24, 10) - Page
18. Note that backup thermostat (10)
keeps heater functioning for only a
short time.
Reduce flow rate or use 2 heaters.
Flush regularly - Page 16.
Tighten fittings or replace heater
block - Page 20.
R Mp
230°F
(110°C)
a
1
6-55 ohm
R
Troubleshooting
Solution
SL
e
1
255°F
(124°C)
05556-524
17