Hose Heat System - Graco Reactor E-20 Series Manual

Troubleshooting

Hose Heat System

Before performing any troubleshooting procedures:
1. Relieve pressure, page 26.
2. Turn main power OFF
PROBLEM
Hose heats but heats slower
than usual or it does not reach
temperature.
Hose does not maintain tem-
perature while spraying.
Hose temperature exceeds set-
point.
24
.
CAUSE
Ambient temperature is too cold.
FTS failed or not installed correctly.
Low supply voltage.
A and B setpoints too low.
Ambient temperature is too cold.
Flow too high.
Hose was not fully preheated.
Low supply voltage.
A and/or B heaters are overheating
material.
Faulty thermocouple connections.
Missing/damaged insulation around
FTS, causing the hose heat to be ON
constantly.
3. Allow equipment to cool.
Problems
Try the recommended solutions in the order given for
each problem, to avoid unnecessary repairs. Also,
determine that all circuit breakers, switches, and con-
trols are properly set and wiring is correct before assum-
ing there is a problem.
Use auxiliary hose heat system.
Check FTS, page 13.
Verify line voltage. Low line voltage signifi-
cantly reduces power available to hose
heat system, affecting longer hose
lengths.
Increase A and B setpoints. Hose is
designed to maintain temperature, not to
increase it.
Increase A and B setpoints to increase
fluid temperature and keep it steady.
Use smaller mix chamber. Decrease pres-
sure.
Wait for hose to heat to correct tempera-
ture before spraying.
Verify line voltage. Low line voltage signifi-
cantly reduces power available to hose
heat system, affecting longer hose
lengths.
Check primary heaters for either a ther-
mocouple problem or a failed element
attached to thermocouple, page 13.
Verify that all FTS connections are snug
and that pins of connectors are clean.
Examine connection of thermocouples to
long green plug on heater control board.
Unplug and re-plug thermocouple wires,
cleaning off any debris. Unplug and
re-plug long green connector on heater
control board.
Ensure hose bundle has adequate insula-
tion evenly covering the entire length and
connection joints.
SOLUTION
312066ZAD