Troubleshooting - Graco VISCON HP Instructions - Parts Manual

Troubleshooting

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
18
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.
10
37
BLACK
L1
GND
L2
BLACK
WHITE
37
24
Cause
11
BLACK
WHITE
WHITE BLACK
3 BLOCK, HEATER
15
Solution
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
19.
Replace block - Page 21.
Check continuity of primary thermo-
stat (24) and backup thermostat (10).
Replace thermostats if necessary
when replacing thermal limit sensor
(15) - Pages 19-21.
Increase warm-up time.
Adjust setting - Page 16.
Reduce flow rate or use 2 heaters.
Flush regularly - Page 17.
Adjust setting - Page 16.
Replace - Page 19.
Replace thermostats (24, 10) - Page
19. Note that backup thermostat (10)
keeps heater functioning for only a
short time.
Reduce flow rate or use 2 heaters.
Flush regularly - Page 17.
Tighten fittings or replace heater
block - Page 21.
53
J3 = 120 VAC
J2 = 200/240 VAC
J1 = 380/480 VAC
ti31122a
309524V